CN117117458A

CN117117458A - Electronic equipment

Info

Publication number: CN117117458A
Application number: CN202210537013.7A
Authority: CN
Inventors: 王泽东
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-05-17
Filing date: 2022-05-17
Publication date: 2023-11-24
Also published as: WO2023221489A1

Abstract

The application discloses an electronic device, which comprises an antenna device and a foldable main body with unfolding and folding states; the antenna device comprises a first antenna component and a second antenna component which are arranged on the foldable main body; the first antenna component comprises a first antenna radiator, a first switching circuit and a first feed source, wherein the first antenna radiator, the first switching circuit and the first feed source are arranged along a first direction; the second antenna assembly comprises a second antenna radiator with a second grounding end and a second free end which are arranged along a second direction, and the second direction is the same as the first direction; when the foldable body is in the unfolded state: the first antenna radiator and the second antenna radiator are respectively positioned at two opposite sides of the foldable main body, and the first antenna assembly and the second antenna assembly support a first low-frequency band; when the foldable body is in the folded state: the first antenna radiator and the second antenna radiator are positioned on the same side of the foldable main body, and the first antenna component supports an intermediate frequency band and/or a high frequency band, or the first antenna radiator is disconnected with the first feed source through the first switching circuit.

Description

Electronic equipment

Technical Field

The application relates to the technical field of communication, in particular to electronic equipment.

Background

With the development of large screens of electronic devices, foldable electronic devices have become a research and development hotspot. As an important part of communication on an electronic device, an antenna is an important part of communication on the electronic device, and isolation and an envelope correlation coefficient between a plurality of antennas are affected by a change in a folding state of the foldable electronic device, so how to improve antenna performance of an antenna device on the foldable electronic device in different forms has become an important point of study.

Disclosure of Invention

In a first aspect, an embodiment of the present application provides an electronic device, including:

a foldable body having an unfolded state and a folded state; a kind of electronic device with high-pressure air-conditioning system

The antenna device comprises a first antenna component and a second antenna component which are arranged on the foldable main body;

the first antenna assembly comprises a first antenna radiator and a first feed source which is electrically connected with the first antenna radiator through a first switching circuit, the first antenna radiator is provided with a first grounding end and a first free end, the first antenna radiator is connected with the foldable main body through the first grounding end, and the direction from the first grounding end to the first free end is a first direction;

the second antenna assembly comprises a second antenna radiator, the second antenna radiator is provided with a second grounding end and a second free end, the second antenna radiator is connected with the foldable main body through the second grounding end, the direction from the second grounding end to the second free end is a second direction, and the second direction is the same as the first direction;

when the foldable body is in the unfolded state: the first antenna radiator and the second antenna radiator are respectively positioned at two opposite sides of the foldable main body, and the first antenna component and the second antenna component are used for supporting a first low-frequency band;

When the foldable body is in a folded state: the first antenna radiator and the second antenna radiator are positioned on the same side of the foldable main body, and the first antenna component is used for supporting an intermediate frequency band and/or a high frequency band, or the first antenna radiator is disconnected with the first feed source through the first switching circuit.

In a second aspect, an embodiment of the present application further provides an electronic device, including:

The antenna device comprises a first antenna assembly, a second antenna assembly, a third antenna assembly and a fourth antenna assembly which are arranged on the foldable main body;

the first antenna assembly comprises a first antenna radiator, a first grounding end and a first free end of the first antenna radiator, the first antenna radiator is connected with the foldable main body through the first grounding end, and the direction from the first grounding end to the first free end is a first direction;

The first antenna radiator and the second antenna radiator are respectively positioned at two opposite sides of the foldable main body when the foldable main body is in an unfolding state; the first antenna radiator and the second antenna radiator are positioned on the same side of the foldable body when the foldable body is in a folded state;

the third antenna assembly comprises a third antenna radiator, wherein the third antenna radiator is provided with a third grounding end and a third free end, and the direction from the third grounding end to the third free end is a third direction;

the fourth antenna assembly comprises a fourth antenna radiator, the fourth antenna radiator is provided with a fourth grounding end and a fourth free end, and the direction from the fourth grounding end to the fourth free end is a fourth direction, wherein the fourth direction is opposite to the third direction;

when the foldable main body is in an unfolded state, the first antenna assembly, the second antenna assembly, the third antenna assembly and the fourth antenna assembly are used for supporting MIMO of a first low-frequency band; when the foldable body is in a folded state, the second antenna assembly, the third antenna assembly and the fourth antenna assembly are used for supporting CA or ENDC of the first low frequency band and the second low frequency band.

When the foldable body is in a folded state, the first antenna radiator and the second antenna radiator are located on the same side of the foldable body, and therefore, a distance between the first antenna radiator and the second antenna radiator is relatively short. If the first antenna assembly and the second antenna assembly continue to support the same frequency band when the foldable body is in the folded state, the antenna performance of the first antenna assembly and the second antenna assembly may be reduced, thereby resulting in a poor communication effect. In the electronic device provided in the embodiment of the present application, when the foldable main body is in a folded state, the first antenna component does not support a first low frequency band as the second antenna component, but the first antenna component supports an intermediate frequency band and/or a high frequency band, or the first antenna radiator is disconnected from the first feed source through the first switching circuit. Therefore, the first antenna assembly is smaller and even cannot cause adverse effects on the first low-frequency band where the second antenna assembly works, so that the problem that the isolation degree is lower due to smaller spacing between the first antenna assembly and the second antenna assembly when the foldable main body is in a folded state is solved. Therefore, the electronic equipment provided by the embodiment of the application still has better communication performance when the foldable main body is in the folded state.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 2 is an exploded perspective view of the electronic device provided in FIG. 1;

fig. 3 is a top view of the foldable body and antenna device of fig. 2 in an unfolded state;

fig. 4 is a top view of the foldable body and antenna device of fig. 3 in a folded state;

fig. 5 is a schematic circuit diagram of a first switching circuit according to an embodiment of the application;

fig. 6 is a schematic circuit diagram of a first switching circuit according to another embodiment of the present application;

fig. 7 is a top view of a foldable body and an antenna device in an electronic device according to another embodiment of the present application in an unfolded state;

fig. 8 is a top view of a foldable body and an antenna device in an electronic device according to still another embodiment of the present application in an unfolded state;

FIG. 9 is a block diagram of an electronic device according to an embodiment of the present application;

fig. 10 is a schematic view of the current distribution of the foldable body in operation with the first antenna assembly in the unfolded state;

fig. 11 is a schematic view of current distribution when the second antenna is operated with the foldable body in an unfolded state;

fig. 12 is a far field pattern of the first antenna assembly with the foldable body in an unfolded state;

fig. 13 is a far field pattern of the second antenna assembly with the foldable body in an unfolded state;

fig. 14 is an ECC diagram illustrating the first antenna assembly and the second antenna assembly when the foldable body is in an unfolded state;

fig. 15 is a schematic view of current distribution when the foldable body is in an unfolded state and the third antenna assembly is in operation;

fig. 16 is a schematic view of current distribution when the fourth antenna is operated with the foldable body in an unfolded state;

fig. 17 is a far field pattern of the third antenna assembly with the foldable body in an unfolded state;

fig. 18 is a far field pattern of the fourth antenna assembly with the foldable body in an unfolded state;

FIG. 19 is a schematic diagram of ECC curves of the third antenna assembly and the fourth antenna assembly when the foldable body is in an unfolded state;

FIG. 20 is a schematic diagram of ECC curves of various antenna assemblies with the foldable body in an unfolded state;

Fig. 21 is a schematic view of a foldable main body of an electronic device according to still another embodiment of the present application in an unfolded state;

FIG. 22 is a schematic view of the foldable body of FIG. 21 in a folded state;

fig. 23 is a schematic view of a foldable main body in an electronic device according to another embodiment of the present application in an unfolded state;

fig. 24 is a schematic view of the foldable body in the electronic device of fig. 23 in a folded state.

Description of the reference numerals:

an electronic device 1;

an antenna device 10;

the antenna comprises a first antenna assembly 110, a first antenna radiator 111, a first grounding end 111a, a first free end 111b, a first feed point A1, a first switching circuit SW1, a first feed source S1 and a first matching circuit M1;

a switching sub-circuit 1121, a filtering sub-circuit 1122, a low pass sub-circuit 1123, a first regulator sub-circuit 1124, a second regulator sub-circuit 1125, a regulator sub-circuit 1126, and a ground sub-circuit 1127;

the second antenna assembly 120, the second antenna radiator 121, the second ground terminal 121a, the second free terminal 121b, the second switching circuits SW2, SW3, SW4, the second feed source S2, the second matching circuit M2;

a third antenna assembly 130, a third antenna radiator 131, a third ground 131a, a third free end 131b, a third feed S3, and a third matching circuit M3;

A fourth antenna assembly 140, a fourth antenna radiator 141, a fourth ground 141a, a fourth free 141b, a fourth feed S4, a fourth matching circuit M4;

a foldable body 20;

a first body 210, a second body 220, a rotation shaft 230, an axis L0;

a first side 211, a second side 212, a third side 213, a first corner 210a, a third corner 210b;

fourth side 221, fifth side 222, sixth side 223, second corner 220a, fourth corner 220b;

first longitudinal current I ₁₁ First lateral current I ₁₂ Second longitudinal current I ₂₁ Second lateral current I ₂₂ Third longitudinal circuit I ₃₁ Third lateral current I ₃₂ Fourth longitudinal current I ₄₁ Fourth lateral current I ₄₂ ；

First current I ₀₁ Second current I ₀₂ First equivalent current I ₀₃ Second equivalent current I ₀₄ ；

Display screen 30, housing 40, detector 50, controller 60.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Furthermore, references to "an embodiment" or "an implementation" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the disclosure. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

Referring to fig. 1 to fig. 4 together, fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the application; FIG. 2 is an exploded perspective view of the electronic device provided in FIG. 1; fig. 3 is a top view of the foldable body and antenna device of fig. 2 in an unfolded state; fig. 4 is a top view of the foldable body and antenna device of fig. 3 in a folded state. The present application provides a foldable electronic device 1, where the electronic device 1 may be a foldable device such as a mobile phone, a tablet computer, a desktop computer, a laptop computer, an electronic reader, a handheld computer, an electronic display screen, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a personal digital assistant (personal digital assistant, PDA), an augmented reality (augmented reality, AR) \virtual reality (VR) device, a media player, an intelligent wearable device, etc. It will be appreciated that the foldable electronic device 1 may be a foldable display device or a foldable non-display device. In the present application, the electronic device 1 is taken as an example of a folding mobile phone, and other devices may refer to the specific description in the present application.

Referring to fig. 2, the electronic device 1 includes a foldable main body 20 and an antenna device 10. The foldable body 20 has an unfolded state and a folded state.

The foldable body 20 is a skeletal structure of the electronic device 1. The body form of the foldable body 20 corresponds to the body form of the electronic device 1. When the foldable main body 20 is in the unfolded state, the electronic apparatus 1 is in the unfolded state; when the foldable main body 20 is in the folded state, the electronic apparatus 1 is in the folded state. Specifically, the foldable body 20 includes, but is not limited to, a center of the electronic device 1.

In the unfolded state, the foldable main body 20 may be in a flattened shape of 180 ° or a flattened shape of approximately 180 ° (e.g., 170 °, or 175 °, or 185 °), or may be in a bent shape with a certain bending angle, and the bending angle is not limited. In this embodiment, a flattened shape having an expanded state of 180 ° is taken as an example. When the electronic apparatus 1 has the display screen 30, the expansion area of the display screen 30 is relatively large in the expanded state so that the user enjoys the electronic apparatus 1 of a large screen. The folded state refers to a state in which the foldable main body 20 is folded and stacked, and at this time, the electronic device 1 has a small overall size and is easy to carry.

Alternatively, the foldable body 20 includes, but is not limited to, a fold-over structure having one rotation axis L0, and may be a fold-over structure having two or more rotation axes L0, a three-fold, four-fold, or the like. The present embodiment will be described taking the foldable body 20 as an example of a folded structure.

Referring to fig. 2, the foldable main body 20 includes a first main body 210 and a second main body 220 rotatably connected, and in this embodiment, at least one of the first main body 210 and the second main body 220 is rotatably connected through a rotation shaft 230. In other words, the foldable main body 20 includes a first main body 210, a rotation shaft 230, and a second main body 220, which are sequentially connected. In other embodiments, the first body 210 and the second body 220 are directly connected, and the connection between the first body 210 and the second body 220 is bendable. The mode of bending the foldable body 20 is not limited in the embodiment of the present application, as long as the foldable body 20 can be bent.

It should be noted that at least a portion of the first body 210 of the foldable body 20 is made of a conductive material, at least a portion of the second body 220 of the foldable body 20 is made of a conductive material, and the first body 210 is electrically connected to the second body 220. When the foldable main body 20 further includes a rotating shaft 230, at least a portion of the rotating shaft 230 is made of a conductive material, and the first main body 210 is electrically connected to the second main body 220 through the rotating shaft 230. It follows that the foldable body 20 may serve as a reference ground (also referred to as ground pole) for the antenna device 10.

For convenience of description, the connection direction of the first body 210, the rotation shaft 230, and the second body 220 is defined as the negative X-axis direction, and the axis L0 direction of the foldable body 20 is defined as the Y-axis direction, that is, the extending direction of the rotation shaft 230 is defined as the Y-axis direction in the present embodiment. The thickness direction of the foldable body 20 in the unfolded state is the Z-axis direction. Wherein, X axis direction, Y axis direction, Z axis direction are two by two perpendicular. Wherein the direction indicated by the arrow is forward.

Optionally, referring to fig. 2, the electronic device 1 further includes a display screen 30. The display 30 is disposed on one side of the foldable body 20, and in this embodiment, the display 30 is disposed on a front side of the foldable body 20 (the front side refers to a direction facing the user when the user uses the display 30 normally), and optionally, in one embodiment, a portion of the display 30 corresponding to the rotation axis 230 is a flexible display 30 that is bendable. Alternatively, in another embodiment, the display 30 is not disposed at a position corresponding to the rotation shaft 230, but two display 30 are disposed at front sides of the first body 210 and the second body 220, respectively.

Optionally, referring to fig. 2, the electronic device 1 further includes a housing 40. The housing 40 includes a rim 410 and a rear cover 420. When the electronic device 1 is in the flattened state or the approximately flattened state, the display screen 30 and the rear cover 420 are respectively located on two opposite sides (front and rear sides) of the foldable main body 20, wherein the frame 410 is connected between the display screen 30 and the rear cover 420 and surrounds the periphery of the foldable main body 20, and the display screen 30, the frame 410 and the rear cover 420 form a relatively closed whole machine for the electronic device 1. Of course, in other embodiments, the rear side of the electronic device 1 may also be provided with the display screen 30.

The frame 410 and the rear cover 420 may be an integral structure or a split structure. When the frame 410 and the rear cover 420 are in a separate structure, the interior of the frame 410 may be formed as an integral structure with the middle frame (foldable body 20). The middle frame is formed with a plurality of mounting grooves for mounting various electronic devices. After the display screen 30, the middle frame and the rear cover 420 are closed, a receiving space is formed on both sides of the middle frame. The electronic device 1 further includes a circuit board (including a main board, an auxiliary board, a flexible circuit board, etc.), a battery, a camera module, a microphone, a receiver, a speaker, a face recognition module, a fingerprint recognition module, etc. disposed in the accommodating space, which are capable of implementing the basic functions of the mobile phone, and will not be described in detail in this embodiment. It should be understood that the above description of the electronic device 1 is merely illustrative of one environment in which the antenna device 10 is applied, and the specific structure of the electronic device 1 should not be construed as limiting the antenna device 10 provided by the present application.

The antenna device 10 may be disposed inside the housing 40 of the electronic apparatus 1, or partially integrated with the housing 40, or partially disposed outside the housing 40. The antenna device 10 is configured to transmit and receive radio frequency signals, where the radio frequency signals are transmitted as electromagnetic wave signals in an air medium, so as to implement a communication function of the electronic device 1. The position of the antenna device 10 on the electronic device 1 is not particularly limited in the present application, and the position of the antenna device 10 on the electronic device 1 shown in fig. 1 is merely an example.

Referring to fig. 3, the antenna device 10 includes a first antenna assembly 110 and a second antenna assembly 120 disposed on the foldable body 20. The first antenna assembly 110 includes a first antenna radiator 111 and a first feed S1 electrically connected to the first antenna radiator 111 through a first switching circuit SW 1. The first antenna radiator 111 has a first ground end 111a and a first free end 111b, the first antenna radiator 111 is connected to the foldable body 20 through the first ground end 111a, and a direction from the first ground end 111a to the first free end 111b is a first direction. The second antenna assembly 120 includes a second antenna radiator 121. The second antenna radiator 121 has a second ground end 121a and a second free end 122b. The second antenna radiator 121 is connected to the foldable body 20 through the second ground end 121a, and a direction from the second ground end 121a to the second free end 122b is a second direction, and the second direction is the same as the first direction. When the foldable body 20 is in the unfolded state: the first antenna radiator 111 and the second antenna radiator 121 are respectively located at opposite sides of the foldable body 20, and the first antenna assembly 110 and the second antenna assembly 120 are used for supporting a first low frequency band. When the foldable body 20 is in the folded state: the first antenna radiator 111 and the second antenna radiator 121 are located on the same side of the foldable body 20, and the first antenna assembly 110 is used for supporting an intermediate frequency band and/or a high frequency band, or the first antenna radiator 111 is disconnected from the first feed source S1 through the first switching circuit SW 1.

The first antenna assembly 110 includes a first antenna radiator 111, a first switching circuit SW1, and a first feed S1. The first feed S1 is electrically connected to the first antenna radiator 111 through the first switching circuit SW 1. The first antenna radiator 111 is a port for receiving and transmitting radio frequency signals of the first antenna assembly 110, wherein the radio frequency signals are transmitted in the form of electromagnetic wave signals in an air medium. The shape of the first antenna radiator 111 is not particularly limited in the present application. For example, the shape of the first antenna radiator 111 includes, but is not limited to, a strip, a sheet, a bar, a coating, a film, and the like. The first antenna radiator 111 shown in the schematic view of the present embodiment is only an example, and the shape of the first antenna radiator 111 provided by the present application is not limited. Alternatively, when the frame is made of a conductive material, the first antenna radiator 111 may be integrated with the frame, that is, the first antenna radiator 111 is a frame antenna, and a portion of the frame is the first antenna radiator 111. Alternatively, the first antenna radiator 111 may also be a part of the middle frame (i.e. the foldable main body 20), so that the first antenna radiator 111 and the middle frame are interconnected as a unitary structure. The first antenna radiator 111 may be formed by cutting a slit in the middle frame. In this embodiment, the frame portion corresponding to the first antenna radiator 111 may be made of a non-conductive material, so that the first antenna radiator 111 can transmit and receive electromagnetic wave signals through the frame. Still alternatively, the antenna formed by the first antenna radiator 111 is a bracket antenna. Among them, the bracket antenna includes, but is not limited to, a flexible circuit board antenna molded on a flexible circuit board (Flexible Printed Circuit board, FPC), a laser direct structuring antenna by laser direct structuring (Laser Direct Structuring, LDS), a printed direct structuring antenna by printing direct structuring (Print Direct Structuring, PDS), a conductive sheet antenna, and the like. Divided in another dimension, the first Antenna radiator 111 is a planar inverted-F Antenna (PIFA).

Optionally, the material of the first antenna radiator 111 is a conductive material, and specific materials include, but are not limited to, metals such as copper, gold, silver, or alloys formed by copper, gold, and silver and other materials; or other non-metallic conductive materials such as oxide conductive materials such as metal oxide conductive materials (e.g., indium tin oxide, gallium indium tin oxide), or carbon nanotubes and polymers forming mixed conductive materials, etc.

The first antenna radiator 111 has a first feed point A1. The first feed source S1 is electrically connected to the first feed point A1 through the first switching circuit SW 1. In the present embodiment, the first switching circuit SW1 is electrically connected to the first feeding point A1 of the first antenna radiator 111. The first feed source S112 includes, but is not limited to, a radio frequency transceiver chip and a radio frequency front-end circuit. Typically, the first feed S112 is disposed on a motherboard of the electronic device 1.

The first antenna radiator 111 is electrically connected to the first feed source S1 through the first switching circuit SW1, and thus, the first switching circuit SW1 may control the first feed source S1 to be electrically connected to the first antenna radiator 111, and the first switching circuit SW1 may also conduct the connection of the first feed source S1 to the first antenna radiator 111, and the first switching circuit SW1 may also disconnect the first feed source S1 from the first antenna radiator 111.

Referring to fig. 5, fig. 5 is a schematic circuit diagram of a first switching circuit according to an embodiment of the application. In the present embodiment, the first switching circuit SW1 includes a switching sub-circuit 1121 and a regulating sub-circuit 1126. The switching sub-circuit 1121 turns on the connection of the first antenna radiator 111 and the first feed source S1, or turns off the connection of the first antenna radiator 111 and the first feed source S1. The adjusting sub-circuit 1126 has one end grounded and the other end electrically connected to the switching sub-circuit 1121, and the adjusting sub-circuit 1126 is configured to adjust an equivalent electrical length of the first antenna radiator 111 of the first antenna assembly 110 when the first antenna radiator 111 is connected to the first feed source S1, so that the first antenna assembly 110 satisfies an electrical length required to support the first low frequency band when the folded main body 20 is in an unfolded state. The regulator sub-circuit 1126 may be, but is not limited to being, a capacitor, or an inductor, or a combination of a capacitor and an inductor. When the foldable body 20 is in the unfolded state, the switching sub-circuit 1121 conducts the connection between the first antenna radiator 111 and the first feed source S1, and the first antenna assembly 110 supports the first low frequency band. When the foldable body 20 is in the folded state, the switching sub-circuit 1121 disconnects the first antenna radiator 111 from the first feed S1. It will be appreciated that the regulator sub-circuit 1126 may also be absent from the first switching circuit SW1 when the electrical length of the first antenna radiator 111 corresponds to the electrical length required to support the first low frequency band.

In another embodiment, referring to fig. 6, fig. 6 is a schematic circuit diagram of a first switching circuit according to another embodiment of the present application. The first switching circuit SW1 includes a switching sub-circuit 1121, a filtering sub-circuit 1122, and a low-pass sub-circuit 1123. The switching sub-circuit 1121 is configured to electrically connect the filter sub-circuit 1122 or the low-pass sub-circuit 1123 to the first antenna radiator 111. The switching subcircuit 1121 may be, but is not limited to being, a single pole double throw switch, or a double pole double throw switch, or other forms of switches.

In one embodiment, the filtering sub-circuit 1122 is configured to filter out the high frequency band and the low frequency band (including the first low frequency band) by the intermediate frequency band such that the first antenna component 110 supports the intermediate frequency band. When the filtering sub-circuit 1122 filters out the high frequency band and the low frequency band through the intermediate frequency band, the filtering sub-circuit 1122 is a band-pass filtering circuit. In another embodiment, the filtering sub-circuit 1122 is configured to filter out low frequency bands (including the first low frequency band) by high frequency bands such that the first antenna component 110 supports high frequency bands. When the filter sub-circuit 1122 is used to filter out the low frequency band by passing the high frequency band, the filter sub-circuit 1122 is a high pass filter circuit. In yet another embodiment, the filtering sub-circuit 1122 is configured to filter out low frequency bands (including the first low frequency band) by the intermediate frequency band and the high frequency band such that the first antenna component 110 supports the intermediate frequency band and the high frequency band. Therefore, when the switching sub-circuit 1121 is used to electrically connect the filter sub-circuit 1122 to the first antenna radiator 111, the first antenna element 110 no longer supports the first low frequency band. The switching sub-circuit 1121 is configured to electrically connect the filter sub-circuit 1122 to the first antenna radiator 111 when the foldable body 20 is in the folded state, such that the first antenna assembly 110 is configured to support an intermediate frequency band and/or a high frequency band.

The low-pass sub-circuit 1123 is configured to pass a low frequency band, and therefore, when the switching sub-circuit 1121 electrically connects the low-pass sub-circuit 1123 to the first antenna radiator 111, the first antenna component 110 supports the first low frequency band. The low pass subcircuit 1123 may include, but is not limited to, a 0 ohm element, or a small inductance. When the foldable body 20 is in the unfolded state, the switching sub-circuit 1121 couples the low-pass sub-circuit 1123 to the first antenna radiator 111.

In addition, the first switching circuit SW1 further includes a first regulator sub-circuit 1124. The first adjusting sub-circuit 1124 is electrically connected to the filtering sub-circuit 1122 for adjusting the equivalent electrical length of the first antenna radiator 111 of the first antenna assembly 110 so that the first antenna assembly 110 satisfies the electrical length required to support the intermediate frequency band and/or the high frequency band when the folded body 20 is in the folded state. The first switching circuit SW2 further includes a second regulator sub-circuit 1125. The second adjusting sub-circuit 1125 is electrically connected to the low-pass sub-circuit 1123 for adjusting the equivalent electrical length of the first antenna radiator 111 of the first antenna element 110 such that the first antenna element 110 satisfies the electrical length required to support the first low frequency band when the foldable body 20 is in the unfolded state. It should be noted that, if the equivalent electrical length of the first antenna radiator 111 satisfies the electrical length required by the antenna assembly 110 to support the intermediate frequency band and/or the high frequency band when the foldable main body 20 is in the folded state, the first switching circuit SW1 may not include the first adjusting sub-circuit 1124. The first switching circuit SW1 may not further include the second adjusting sub-circuit 1125 if the equivalent electrical length of the first antenna radiator 111 satisfies the electrical length required for the antenna assembly 110 to support the first low frequency band when the foldable body 20 is in the unfolded state.

In addition, the first switching circuit SW1 further includes a ground sub-circuit 1127, and the ground sub-circuit 1127 has one end grounded and the other end electrically connected to the switching sub-circuit 1121. When the foldable body 20 is in a folded state, the first antenna radiator 111 is disconnected from the first feed source S1 through the first switching circuit SW1, and the switching sub-circuit 1121 is grounded through the ground sub-circuit 1127. The ground subcircuit 1127 may be, but is not limited to, a capacitor, an inductor, or the like. When the foldable body 20 is in the folded state, the switching sub-circuit 1121 is electrically connected to the ground sub-circuit 1127, so that the first antenna radiator 111 is disconnected from the first feed S1.

The first antenna radiator 111 has a first ground end 111a and a first free end 111b. The first grounding end 111a and the first free end 111b are located at two sides of the first feeding point A1. In other words, the first antenna radiator 111 has a first free end 111b, a first feeding point A1, and a first free end 111b that are sequentially disposed. The first ground terminal 111a is electrically connected to the foldable body 20 to be grounded. The first ground 111a may be electrically connected to the foldable body 20 via conductive connectors (e.g., connecting ribs, conductive glue, etc.). Specifically, in the present embodiment, the first ground terminal 111a is electrically connected to the first body 210 of the foldable body 20. In this embodiment, the first free end 111b is spaced apart from the first body 210 of the foldable body 20.

The first antenna radiator 111 may be disposed along an extending direction of the axis L0 of the foldable body 20. In the present embodiment, at least part of the first antenna radiator 111 is disposed along the extending direction of the rotation shaft 230. For example, a part or all of the first antenna radiator 111 is disposed along the extending direction of the rotation shaft 230. The present application is exemplified by the fact that all of the first antenna radiator 111 is disposed along the extending direction (Y-axis direction) of the rotation shaft 230.

The direction from the first grounding end 111a to the first free end 111b is a first direction. In this embodiment, the first direction is a Y-axis positive direction. In other embodiments, the first direction may be a negative Y-axis direction.

The second antenna assembly 120 includes a second antenna radiator 121 and a second feed source S2. The second feed S2 is electrically connected to the second antenna radiator 121. The second antenna radiator 121 is a port for receiving and transmitting radio frequency signals of the second antenna assembly 120, wherein the radio frequency signals are transmitted in the form of electromagnetic wave signals in an air medium. The shape of the second antenna radiator 121 is not particularly limited in the present application. For example, the shape of the second antenna radiator 121 includes, but is not limited to, a strip shape, a sheet shape, a rod shape, a coating shape, a film shape, etc. The second antenna radiator 121 shown in fig. 3 is only an example, and the shape of the second antenna radiator 121 provided by the present application is not limited. Alternatively, when the frame is made of a conductive material, the second antenna radiator 121 may be integrated with the frame, that is, the second antenna radiator 121 is a frame antenna, and a portion of the frame 410 is the second antenna radiator 121. Alternatively, the second antenna radiator 121 may also be a part of the middle frame (i.e. the foldable main body 20), so that the second antenna radiator 121 and the middle frame are interconnected as a unitary structure. The second antenna radiator 121 may be formed by cutting a slit in the middle frame. In this embodiment, the portion of the frame 410 corresponding to the second antenna radiator 121 may be made of a non-conductive material, so that the second antenna radiator 121 can transmit and receive electromagnetic wave signals through the frame. Still alternatively, the antenna formed by the second antenna radiator 121 is a bracket antenna. Among them, the bracket antenna includes, but is not limited to, a flexible circuit board antenna molded on a flexible circuit board (Flexible Printed Circuit board, FPC), a laser direct structuring antenna by laser direct structuring (Laser Direct Structuring, LDS), a printed direct structuring antenna by printing direct structuring (Print Direct Structuring, PDS), a conductive sheet antenna, and the like. Divided in another dimension, the second Antenna radiator 121 is a planar inverted-F Antenna (PIFA).

Optionally, the material of the second antenna radiator 121 is a conductive material, and specific materials include, but are not limited to, metals such as copper, gold, and silver, or alloys formed by copper, gold, and silver and other materials; or other non-metallic conductive materials such as oxide conductive materials such as metal oxide conductive materials (e.g., indium tin oxide, gallium indium tin oxide), or carbon nanotubes and polymers forming mixed conductive materials, etc.

The second antenna radiator 121 has a second feed point A2. The second feed S2 is electrically connected to the second feed point A2. The second feed source S2 includes, but is not limited to, a radio frequency transceiver chip and a radio frequency front-end circuit. Typically, the second feed S2 is disposed on a motherboard of the electronic device 1.

The second antenna radiator 121 has a second ground end 121a and a second free end 122b. The second grounding end 121a and the second free end 122b are located at two sides of the second feeding point A2. In other words, the second antenna radiator 121 has a second free end 122b, a second feeding point A2, and a second free end 122b that are sequentially disposed. The second ground terminal 121a is electrically connected to the foldable body 20 to be grounded. The second ground 121a may be electrically connected to the foldable body 20 through conductive connectors (e.g., connection bars, conductive glue, etc.). Specifically, in the present embodiment, the second ground terminal 121a is electrically connected to the second body 220 of the foldable body 20. In this embodiment, the second free end 122b is spaced from the second body 220 of the foldable body 20.

The second antenna radiator 121 may be disposed along an extension direction of the axis L0 of the foldable body 20. In the present embodiment, at least part of the second antenna radiator 121 is disposed along the extending direction of the rotation shaft 230. For example, a part or all of the second antenna radiator 121 is disposed along the extending direction of the rotation shaft 230. The present application is exemplified by the fact that all of the second antenna radiator 121 is disposed along the extending direction (Y-axis direction) of the rotation shaft 230.

The direction from the second grounding end 121a to the second free end 122b is the second direction. The second direction is the same as the first direction. In this embodiment, the first direction and the second direction are positive Y-axis directions. In other embodiments, the first direction and the second direction may be negative Y-axis directions. The first direction and the second direction may be other directions than the Y-axis positive direction and the Y-axis negative direction depending on the placement position of the electronic device 1, so long as the first direction and the second direction are the same. The first direction is the same as the second direction, and includes the first direction and the second direction being the same (i.e., the angle between the first direction and the second direction is 0 °), and may also include the first direction and the second direction being approximately the same (e.g., the angle between the first direction and the second direction is-10 ° to +10°, or-5 ° to +5°).

When the first direction is the same as the second direction, the envelope correlation coefficient (Envelope correlation coefficient, ECC) between the first antenna component 110 and the second antenna component 120 is smaller, so that the antenna device 10 has better communication performance. The current distribution of the first antenna element 110, the current distribution of the second antenna element 20, and the ECC curve between the first antenna element 110 and the second antenna element 120 will be described later.

The specific forms of the first antenna radiator 111 of the first antenna assembly 110 and the second antenna radiator 121 of the second antenna assembly 120 are not particularly limited in the present application. The following description will take the example in which the first antenna radiator 111 of the first antenna assembly 110 is a planar inverted-F antenna, and the second antenna radiator 121 of the second antenna assembly 120 is a planar inverted-F antenna.

The first antenna radiator 111 and the second antenna radiator 121 are located on opposite sides of the foldable body 20, respectively, when the foldable body 20 is in an unfolded state. In the present embodiment, the first antenna radiator 111 is located on the right side of the foldable body 20, and the second antenna radiator 121 is located on the left side of the foldable body 20. It will be appreciated that in other embodiments, the first antenna radiator 111 is located on the left side of the foldable body 20 and the second antenna radiator 121 is located on the right side of the foldable body 20.

The first antenna assembly 110 and the second antenna assembly 120 are configured to support a first low frequency band when the foldable body 20 is in the unfolded state. The Low frequency (LB) Band means a Band lower than 1000MHz (excluding 1000 MHz). The signal type to which the frequency band belongs may be a cellular mobile communication 4G signal or a cellular mobile communication 5G signal. For example, the first low frequency band is, but not limited to, an NR N28 (703-788 MHz) band or an N5 band or an N8 band, but not limited to, this band, etc. The first low-frequency band, such as the N28 (703-733 MHz uplink and 758-788MHz downlink), has the advantages of long coverage distance, good stability and the like, and is very important for the 5G communication system to re-plough the low-frequency band communication.

Of course, in other embodiments, the first antenna element 110 and the second antenna element 120 support the same frequency band when the foldable main body 20 is in the unfolded state, and the first antenna element 110 and the second antenna element 120 may also support different frequency bands, so as to increase the number of frequency bands or the bandwidth covered by the antenna device 10.

When the foldable main body 20 is in the unfolded state, the first antenna assembly 110 and the second antenna assembly 120 both support the first low frequency band, so that the antenna device 10 has a better communication effect.

The intermediate frequency band (MB) is a band ranging from 1700MHz to 2170MHz (i.e., 1.7GHz to 2.17 GHz), and the high frequency band is a band ranging from 2300MHz to 2690MHz (i.e., 2.3GHz to 2.69 GHz). When the first antenna component 110 supports an intermediate frequency band and a high frequency band, i.e., the first antenna component 110 supports an intermediate and high frequency band (MHB)

For the first antenna assembly 110 and the second antenna assembly 120, when the foldable body 20 is in the unfolded state, the first antenna assembly 110 is relatively far away from the second antenna assembly 120, and the physical distance between the first antenna assembly 110 and the second antenna assembly 120 is such that the isolation between the first antenna assembly 110 and the second antenna assembly 120 is relatively high, and the mutual interference between the first antenna assembly 110 and the second antenna assembly 120 is relatively small. However, when the foldable body 20 is in the folded state, the first antenna radiator 111 of the first antenna element 110 and the second antenna radiator 121 of the second antenna element 120 are disposed on the same side of the foldable body 20, and at this time, the physical space between the first antenna radiator 111 of the first antenna element 110 and the second antenna radiator 121 of the second antenna element 120 is small, especially, when both the first antenna element 110 and the second antenna element 120 are supporting but not limited to supporting the antenna including the low frequency band, the first antenna radiator 111 of the first antenna element 110 and the second antenna radiator 121 of the second antenna element 120 are long, and then the first antenna radiator 111 of the first antenna element 110 and the second antenna radiator 121 of the second antenna element 120 are in a state of very small space or even contact to some extent, which results in poor isolation between the first antenna element 110 and the second antenna element 120, and affects the antenna radiation efficiency of the first antenna element 110 and the second antenna element 120.

When the foldable body 20 is in the folded state, the first antenna radiator 111 and the second antenna radiator 121 are located at the same side of the foldable body 20, and thus, the distance between the first antenna radiator 111 and the second antenna radiator 121 is relatively short. If the first antenna element 110 and the second antenna element 120 continue to support the same frequency band while the foldable body 20 is in the folded state, the antenna performance of the first antenna element 110 and the second antenna element 120 may be degraded, thereby resulting in poor communication effect. In the electronic device 1 provided in the embodiment of the present application, when the foldable main body 20 is in the folded state, the first antenna assembly 110 is no longer supporting the first low frequency band as the second antenna assembly 120, but the first antenna assembly 110 is used for supporting the intermediate frequency band and/or the high frequency band, or the first antenna radiator 111 is disconnected from the first feed source S1 through the first switching circuit SW 1. When the foldable main body 20 is in the folded state, the first antenna assembly 110 is configured to support an intermediate frequency band and/or a high frequency band, that is, the first antenna assembly 110 and the second antenna assembly 120 support different frequency bands, so that the first antenna assembly 110 is smaller and cannot even cause adverse effects on a first low frequency band in which the second antenna assembly 120 works, and further, the problem that when the foldable main body 20 is in the folded state, the isolation degree is lower due to smaller space between the first antenna assembly 110 and the second antenna assembly 120 is reduced. It can be seen that the electronic device 1 provided in the embodiment of the present application still has better communication performance when the foldable main body 20 is in the folded state.

Referring to fig. 7 and fig. 8 together, fig. 7 is a top view of a foldable main body and an antenna device in an electronic apparatus according to another embodiment of the application in an unfolded state; fig. 8 is a top view of a foldable body and an antenna device in an electronic device according to still another embodiment of the present application in an unfolded state. In the present embodiment, the electronic device 1 includes a foldable main body 20 and an antenna device 10. The foldable body 20 has an unfolded state and a folded state. The antenna device 10 further includes a first antenna assembly 110 and a second antenna assembly 120 disposed on the foldable body 20. The foldable body 20, the first antenna assembly 110 and the second antenna assembly 120 are described above, and will not be described in detail herein. The antenna device 10 further comprises a third antenna assembly 130 and a fourth antenna assembly 140 provided to the foldable body 20. When the foldable body 20 is in the unfolded state, the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are used for supporting multiple input/output (Multiple Input Multiple Output, MIMO) of the first low frequency band. The second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to support carrier aggregation (Carrier Aggregation, CA) of the first and second low frequency bands or dual connectivity (LTE NR Double Connect, ENDC) of a 4G network with a 5G network when the foldable body 20 is in a folded state.

In the present embodiment, the first antenna radiator 111 further includes a first matching circuit M1. The first matching circuit M1 is electrically connected to the first feed source S1 and the first switching circuit SW1. The first matching circuit M1 is an impedance matching circuit, and specifically, the first matching circuit M1 is configured to match an input impedance of the first feed source S1 and an output impedance of the first antenna radiator 111, so that the input impedance of the first feed source S1 is matched with the output impedance of the first antenna radiator 111. The first matching circuit M1 includes, but is not limited to, a capacitor, an inductor, a capacitor-inductor combination, a switching tuning device, and the like. Typically, the first matching circuit M1 is disposed on a motherboard of the electronic device 1.

In this embodiment, the second antenna radiator 121 further has a second matching circuit M2. One end of the second matching circuit M2 is electrically connected to the second feeding point A2, and the other end of the second matching circuit M2 is electrically connected to the second feed source S2. The second matching circuit M2 is electrically connected to the second feeding point A2 by, but not limited to, direct welding or indirect electrical connection by means of coaxial lines, microstrip lines, conductive clips, conductive adhesives, etc. In this embodiment, the second matching circuit M2 is electrically connected to the second feeding point A2 through a conductive member (e.g., a conductive spring).

The second matching circuit M2 is an impedance matching circuit, and specifically, the second matching circuit M2 is configured to match an input impedance of the second feed source S2 and an output impedance of the second antenna radiator 121, so that the input impedance of the second feed source S2 is matched with the output impedance of the second antenna radiator 121. The second matching circuit M2 includes, but is not limited to, a capacitor, an inductor, a capacitor-inductor combination, a switching tuning device, and the like. Typically, the second matching circuit M2 is disposed on a motherboard of the electronic device 1.

It will be appreciated that in the schematic diagram of the present embodiment, the second antenna assembly 120 further includes a second switching circuit SW2 is illustrated as an example. It will be appreciated that if the second antenna element 120 supports the first low frequency band and does not support other bands, the second antenna element 120 may not include the second switching circuit SW2. When the second antenna assembly 120 supports a first low frequency band and may also support a second low frequency band, then the second antenna assembly 120 also includes the second switching circuit SW2.

The third antenna assembly 130 includes a third antenna radiator 131, a second switching circuit SW3, and a third feed 133. The third feed 133 is electrically connected to the third antenna radiator 131 through the second switching circuit SW 3. The third antenna radiator 131 is a port for receiving and transmitting radio frequency signals of the third antenna assembly 130, wherein the radio frequency signals are transmitted in the form of electromagnetic wave signals in an air medium. The shape of the third antenna radiator 131 is not particularly limited in the present application. For example, the third antenna radiator 131 has a shape including, but not limited to, a strip shape, a sheet shape, a rod shape, a coating shape, a film shape, etc. The third antenna radiator 131 shown in the schematic diagram of the present embodiment is only an example, and the shape of the third antenna radiator 131 provided by the present application is not limited. Alternatively, when the frame is made of a conductive material, the third antenna radiator 131 may be integrated with the frame 410, that is, the third antenna radiator 131 is a frame antenna, and a portion of the frame is the third antenna radiator 131. Alternatively, the third antenna radiator 131 may also be a part of the middle frame (i.e. the foldable main body 20), so that the third antenna radiator 131 and the middle frame are interconnected as a unitary structure. The third antenna radiator 131 may be formed by cutting a slit in the middle frame. In this embodiment, the frame portion corresponding to the third antenna radiator 131 may be made of a non-conductive material, so that the third antenna radiator 131 can transmit and receive electromagnetic wave signals through the frame 410. Still alternatively, the antenna formed by the third antenna radiator 131 is a bracket antenna. Among them, the bracket antenna includes, but is not limited to, a flexible circuit board antenna molded on a flexible circuit board (Flexible Printed Circuit board, FPC), a laser direct structuring antenna by laser direct structuring (Laser Direct Structuring, LDS), a printed direct structuring antenna by printing direct structuring (Print Direct Structuring, PDS), a conductive sheet antenna, and the like. Divided in another dimension, the third Antenna radiator 131 is a planar inverted F (IPF) Antenna.

Optionally, the third antenna radiator 131 is made of a conductive material, and specific materials include, but are not limited to, metals such as copper, gold, and silver, or alloys formed by copper, gold, and silver and other materials; or other non-metallic conductive materials such as oxide conductive materials such as metal oxide conductive materials (e.g., indium tin oxide, gallium indium tin oxide), or carbon nanotubes and polymers forming mixed conductive materials, etc.

The third antenna radiator 131 has a third feeding point A3. The third feed source 133 is electrically connected to the third feed point A3 through the second switching circuit SW 3. In the present embodiment, the second switching circuit SW3 is electrically connected to the third feeding point A3 of the third antenna radiator 131. Wherein the third feed 133 includes, but is not limited to, a radio frequency transceiver chip and a radio frequency front-end circuit. Typically, the third feed 133 is provided on the motherboard of the electronic device 1.

The third antenna radiator 131 is electrically connected to the third feed source 133 through the second switching circuit SW3, so that the second switching circuit SW3 can control the third feed source 133 to be electrically connected to the third antenna radiator 131, and the second switching circuit SW3 can also control the connection of the third feed source 133 to the third antenna radiator 131.

The third antenna radiator 131 has a third ground end 131a and a third free end 131b. The third ground end 131a and the third free end 131b are located at two sides of the third feeding point A3. In other words, the third antenna radiator 131 has a third free end 131b, a third feeding point A3, and a third free end 131b that are sequentially disposed. The third ground terminal 131a is electrically connected to the foldable body 20 to be grounded. The third ground 131a may be electrically connected to the foldable body 20 through conductive connectors (e.g., connection bars, conductive glue, etc.). Specifically, in the present embodiment, the third ground 131a is electrically connected to the third body of the foldable body 20. In this embodiment, the third free end 131b is spaced apart from the third body of the foldable body 20.

The third antenna radiator 131 may be disposed in a direction perpendicular to an extending direction of the axis L0 of the foldable body 20. The present application is exemplified by the fact that all of the third antenna radiator 131 is disposed in a direction (X direction) perpendicular to the extending direction (Y axis direction) of the rotation shaft 230.

The direction from the third ground end 131a to the third free end 131b is a third direction. In this embodiment, the third direction is the negative X-axis direction. In other embodiments, the third direction may be the positive X-axis direction.

In this embodiment, the third antenna radiator 131 further includes a third matching circuit M3. One end of the third matching circuit M3 is electrically connected to the third feeding point A3, and the other end of the third matching circuit M3 is electrically connected to the third feed source 133. The third matching circuit M3 is electrically connected to the third feeding point A3 by, but not limited to, direct welding or indirect electrical connection by means of coaxial lines, microstrip lines, conductive clips, conductive adhesives, etc. In this embodiment, the third matching circuit M3 is electrically connected to the third feeding point A3 through a conductive member (e.g., a conductive spring).

The third matching circuit M3 is an impedance matching circuit, and specifically, the third matching circuit M3 is configured to match the input impedance of the third feed source 133 and the output impedance of the third antenna radiator 131, so that the input impedance of the third feed source 133 is matched with the output impedance of the third antenna radiator 131. The third matching circuit M3 includes, but is not limited to, a capacitor, an inductor, a capacitor-inductor combination, a switching tuning device, and the like. Typically, the third matching circuit M3 is disposed on the motherboard of the electronic device 1.

It will be appreciated that in the schematic diagram of the present embodiment, the third antenna assembly 130 further includes the second switching circuit SW3 is illustrated as an example. It will be appreciated that if the third antenna element 130 supports the first low frequency band and does not support other bands, the third antenna element 130 may not include the second switching circuit SW3. When the third antenna assembly 130 supports a first low frequency band and may also support a second low frequency band, then the third antenna assembly 130 also includes the second switching circuit SW3.

Optionally, the material of the fourth antenna radiator 141 is a conductive material, and specific materials include, but are not limited to, metals such as copper, gold, and silver, or alloys formed by copper, gold, and silver and other materials; or other non-metallic conductive materials such as oxide conductive materials such as metal oxide conductive materials (e.g., indium tin oxide, gallium indium tin oxide), or carbon nanotubes and polymers forming mixed conductive materials, etc.

The fourth antenna radiator 141 has a fourth feed point A4. The fourth feed 143 is electrically connected to the fourth feed point A4. Wherein the fourth feed source 143 includes, but is not limited to, a radio frequency transceiver chip and a radio frequency front-end circuit. Typically, the fourth feed 143 is disposed on a motherboard of the electronic device 1.

The fourth antenna radiator 141 has a fourth ground 141a and a fourth free 141b. The fourth ground terminal 141a and the fourth free terminal 141b are located at two sides of the fourth feeding point A4. In other words, the fourth antenna radiator 141 has a fourth free end 141b, a fourth feeding point A4, and a fourth free end 141b, which are sequentially disposed. The fourth ground 141a is electrically connected to the foldable body 20 to be grounded. The fourth ground 141a may be electrically connected to the foldable body 20 through conductive connectors (e.g., connection bars, conductive glue, etc.). Specifically, in the present embodiment, the fourth ground 141a is electrically connected to the second body 220 of the foldable body 20. In this embodiment, the fourth free end 141b is spaced apart from the second body 220 of the foldable body 20.

At least part of the fourth antenna radiator 141 may be disposed in a direction perpendicular to an extending direction of the axis L0 of the foldable body 20. In the present embodiment, at least a portion of the fourth antenna radiator 141 is disposed in a direction perpendicular to the extending direction of the rotation shaft 230. For example, a part or all of the fourth antenna radiator 141 is disposed in a direction perpendicular to the extending direction of the rotation shaft 230. The present application is exemplified by a portion of the fourth antenna radiator 141 being disposed in a direction (X-axis direction) perpendicular to the extending direction (Y-axis direction) of the rotation shaft 230, and another portion of the fourth antenna radiator 141 being disposed in a direction (Y-axis direction) extending from the axis L0.

In fig. 8, the fourth antenna radiator 141 is entirely disposed along a direction perpendicular to the axis L0.

The fourth ground 141a to the fourth free 141b is in a fourth direction. The fourth direction is opposite to the third direction. In this embodiment, the third direction is the negative X-axis direction, and correspondingly, the fourth direction is the positive X-axis direction. In other embodiments, the third direction may be a positive X-axis direction, and correspondingly, the fourth direction is a negative X-axis direction. The third direction being opposite to the fourth direction may include the third direction being completely opposite to the fourth direction (i.e., the angle between the first direction and the fourth direction is 180 °), or may include the third direction being approximately opposite to the fourth direction (e.g., the range between the angles between the third direction and the fourth direction is 180°±10°, or 180°±5°).

When the third direction is opposite to the fourth direction, the ECC between the third antenna element 130 and the fourth antenna element 140 can be ensured to be smaller, and the current schematic diagrams and ECC curves of the third antenna element 130 and the fourth antenna element will be analyzed later.

In the present embodiment, the fourth antenna radiator 141 further includes a fourth matching circuit M4. One end of the fourth matching circuit M4 is electrically connected to the fourth feeding point A4, and the other end of the fourth matching circuit M4 is electrically connected to the fourth feed source 143. The fourth matching circuit M4 is electrically connected to the fourth feeding point A4 by, but not limited to, direct welding or indirect electrical connection via coaxial line, microstrip line, conductive spring, conductive adhesive, etc. In this embodiment, the fourth matching circuit M4 is electrically connected to the fourth feeding point A4 through a conductive member (e.g., a conductive spring).

The fourth matching circuit M4 is an impedance matching circuit, and specifically, the fourth matching circuit M4 is configured to match the input impedance of the fourth feed source 143 and the output impedance of the fourth antenna radiator 141, so that the input impedance of the fourth feed source 143 is matched with the output impedance of the fourth antenna radiator 141. The fourth matching circuit M4 includes, but is not limited to, a capacitor, an inductor, a capacitor-inductor combination, a switching tuning device, and the like. In general, the fourth matching circuit M4 is disposed on the motherboard of the electronic device 1. The specific forms of the third antenna radiator 131 of the third antenna assembly 130 and the fourth antenna radiator 141 of the fourth antenna assembly 140 are not particularly limited. The following description will take the example in which the third antenna radiator 131 of the third antenna assembly 130 is a planar inverted-F antenna, and the fourth antenna radiator 141 of the fourth antenna assembly 140 is a planar inverted-F antenna.

It will be appreciated that in the schematic diagram of the present embodiment, the fourth antenna assembly 140 further includes the second switching circuit SW4 is illustrated as an example. It will be appreciated that if the fourth antenna element 140 supports the first low frequency band and does not support other bands, the fourth antenna element 140 may not include the second switching circuit SW4. When the fourth antenna element 140 supports the first low frequency band and may also support the second low frequency band, then the fourth antenna element 140 further comprises the second switching circuit SW4.

As the internet surfing speed requirement for the electronic device 1 increases, the throughput requirement for data transmission increases. A multiple-input multiple-output (Multiple Input Multiple Output, MIMO) system has great advantages in terms of improving data rate, and the system uses one or more transmitting antennas and multiple receiving antennas at a transmitting end and a receiving end of a wireless communication system, respectively, so that signals are transmitted and received through the multiple antennas at the transmitting end and the receiving end, a plurality of parallel spatial channels are created, and multiple information flows or multiple channels are simultaneously transmitted in the same frequency band, thereby increasing system capacity. The MIMO system can fully utilize space resources, realize multiple transmission and multiple reception through a plurality of antennas, and can increase space dimension by using the plurality of antennas under the condition of not increasing frequency spectrum resources and antenna transmitting power, realize multidimensional signal processing, obtain space diversity gain or space multiplexing gain, and can doubly improve the system channel capacity.

Since the MIMO system increases signal capacity by transmitting parallel spatially independent data streams, the MIMO system requires low mutual coupling performance between antennas. Envelope correlation coefficients (Envelope correlation coefficient, ECC) are quantization indices reflecting spatial correlation between antennas, and can be used to evaluate independence between antennas in terms of radiation pattern and polarization in a MIMO system. The smaller the envelope correlation coefficient, the smaller the correlation between antennas, the higher the diversity gain of the MIMO system, and the better the communication performance of the MIMO system.

When the foldable body 20 is in the unfolded state, the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are used for supporting MIMO of the first low frequency band, so as to increase transmission throughput and data transmission rate of the first low frequency band.

When the foldable main body 20 is in the folded state, the distance between the first antenna assembly 110 and the second antenna assembly 120 is smaller, and the first antenna assembly 110 and the second antenna assembly 120 no longer support the same first low frequency band; instead, when the foldable main body 20 is in the folded state, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are used for supporting carrier aggregation (Carrier Aggregation, CA) of the first low frequency band and the second low frequency band or dual connection (LTE NR Double Connect, ENDC) of the 4G network and the 5G network, so that the antenna apparatus 10 can still have better communication performance and can meet the application requirements of the european operator l+l.

When the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to support the first low frequency band and the second low frequency band being CA, the antenna device 10 may have a larger bandwidth, and thus, the antenna device 10 may have better communication performance.

When the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are used for supporting the first low frequency band and the second low frequency band ENDC, dual connection between the 4G network and the 5G network can be achieved, so that the antenna assembly 10 has better performance.

The specific cases of the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 for supporting CA or ENDC of the first low frequency band and the second low frequency band when the foldable body 20 is in the folded state will be described in detail later.

In order to obtain better communication performance of the MIMO system, the MIMO system requires that the spacing between the antenna elements is above half a wavelength. When the MIMO system is applied to low frequency antennas, the MIMO system has a certain requirement for a space between the low frequency antennas. However, with the miniaturization development of the electronic device 1, the space on the electronic device 1 is extremely limited, and how to improve the correlation difference between the antenna components of the MIMO system on the foldable electronic device 1 and improve the communication performance of the MIMO system is needed to be solved.

The electronic device 1 provided by the application can solve the problem of reduced isolation between the antenna assemblies caused by reduced spacing between the antenna assemblies on the foldable electronic device 1 in a folded state, can also improve poor correlation between the antenna assemblies of a MIMO system, improves communication performance of the MIMO system, and realizes that the antenna device 10 can support a low-frequency MIMO system. The respective antenna components in the antenna arrangement 10 of the electronic device 1 will be described later.

With continued reference to fig. 7, the foldable body 20 includes a first corner portion 210a, a second corner portion 220a, a third corner portion 210b, and a fourth corner portion 220b. When the foldable body 20 is in the flattened state, the first corner portion 210a and the second corner portion 220a are disposed diagonally, the third corner portion 210b and the fourth corner portion 220b are disposed diagonally, the first corner portion 210a and the third corner portion 210b are located on the same side of the axis L0 of the foldable body 20, and the second corner portion 220a and the fourth corner portion 220b are located on the same side of the axis L0 of the foldable body 20. The first antenna radiator 111 is located between the first corner portion 210a and the third corner portion 210b, the first direction being parallel to the axis L0; the second antenna radiator 121 is located between the second corner portion 220a and the fourth corner portion 220b, and the second direction is parallel to the axis L0.

In this embodiment, the first body 210 includes a first edge 211, and a second edge 212 and a third edge 213 connected to opposite sides of the first edge 211. Wherein the first edge 211 is an edge of the first body 210 facing away from the axis L0 of the foldable body 20. In this embodiment, the first edge 211 is parallel or approximately parallel to the axis L0 of the foldable body 20. The second edge 212 is opposite to the third edge 213, and is connected to the first edge 211 in a bending manner. In this embodiment, the second edge 212 is perpendicular or approximately perpendicular to the axis L0 of the foldable body 20. In this embodiment, the third side 213 is perpendicular or approximately perpendicular to the foldable body 20. The junction between the first edge 211 and the second edge 212 is defined as a first corner 210a, and the junction between the first edge 211 and the third edge 213 is defined as a third corner 210b. The first antenna radiator 111 is disposed corresponding to the first side 211 and is spaced apart from the first side 211.

The second body 220 includes a fourth side 221, and a fifth side 222 and a sixth side 223 connected to opposite sides of the fourth side 221. Wherein the fourth side 221 is the side of the second body 220 facing away from the axis L0 of the foldable body 20. In this embodiment, the fourth side 221 is parallel or approximately parallel to the axis L0 of the foldable body 20. The fifth side 222 is opposite to the sixth side 223, and is connected to the fourth side 221 in a bending manner. In this embodiment, the fifth edge 222 is perpendicular or approximately perpendicular to the axis L0 of the foldable body 20. In this embodiment, the sixth edge 223 is perpendicular or approximately perpendicular to the axis L0 of the foldable body 20. In the present embodiment, a connection between the fourth side 221 and the fifth side 222 is defined as a second corner 220a, and a connection between the fourth side 221 and the sixth side 223 is defined as a fourth corner 220b. The second antenna radiator 121 is disposed corresponding to the fourth side 221 and spaced apart from the fourth side 221.

In this embodiment, when the foldable body 20 is in the unfolded state, the first body 210 is located on the left side of the axis L0 of the foldable body 20, the second body 220 is located on the right side of the axis L0 of the foldable body 20, and thus, the first edge 211 is the right side of the first body 210, the second edge 212 is the bottom edge of the foldable body 20, and the third edge 213 is the top edge of the foldable body 20; the fourth side 221 is a left side of the second body 220, the fifth side 222 is a top side of the second body 220, and the sixth side 223 is a bottom side of the second body 220. Accordingly, when the foldable body 20 is in the unfolded state, the first corner portion 210a is located at the lower right corner of the foldable body 20, the second corner portion 220a is located at the upper left corner of the foldable body 20, the third corner portion 210b is located at the upper right corner of the foldable body 20, and the fourth corner portion 220b is located at the lower left corner of the foldable body 20. It will be appreciated that the orientation of the first side 211, the second side 212, the third side 213, the fourth side 221, the fifth side 222, and the sixth side 223 may vary depending on the placement position of the foldable body 20. Accordingly, the orientation of the first corner portion 210a, the second corner portion 220a, the third corner portion 210b, and the fourth corner portion 220b may also change.

The first antenna radiator 111 is disposed corresponding to the first side 211, and the first antenna radiator 111 is located between the first corner portion 210a and the third corner portion 210 b. The first direction is parallel to the axis L0, including but not limited to, the first direction being completely parallel, or approximately parallel, to the axis L0. When the first direction is completely parallel to the axis L0, an angle between the first direction and the axis L0 is 0 °; when the first direction is approximately parallel to the axis L0, an angle between the first direction and the axis L0 may range from-10 ° to +10°, or from-5 ° to +5°.

The second antenna radiator 121 is disposed corresponding to the second side 212, and the second antenna radiator 121 is located between the second corner portion 220a and the fourth corner portion 220 b. The second direction is parallel to the axis L0, including but not limited to, the second direction being completely parallel, or approximately parallel, to the axis L0. When the second direction is completely parallel to the axis L0, an angle between the second direction and the axis L0 is 0 °; when the second direction is approximately parallel to the axis L0, an angle between the second direction and the axis L0 may range from-10 ° to +10°, or from-5 ° to +5°.

The first free end 111b is disposed adjacent to the third corner portion 210b as compared to the first ground end 111 a; the second free end 122b is disposed adjacent the second corner 220a as compared to the second ground end 121 a.

In this embodiment, the first free end 111b is adjacent to the third corner 210b than the first ground end 111a, and therefore, the first ground end 111a is disposed more corresponding to the middle of the first side 211 than the first free end 111b, and the ground position of the first body 210 of the foldable main body 20 to which the first ground end 111a is connected is closer to the middle of the first side 211. The first free end 111b is disposed adjacent to the third corner 210b compared to the first ground end 111a, and the first free end 111b is closer to the top of the electronic device 1 when the user uses the electronic device 1, so that the user does not easily grasp the first free end 111b, and thus, a decrease in antenna performance of the first antenna assembly 110 caused when the user grasps the first free end 111b can be reduced or avoided. It can be seen that the first free end 111b is disposed adjacent to the third corner portion 210b compared to the first ground end 111a, which ensures better antenna performance of the first antenna assembly 110.

In this embodiment, the second free end 122b is disposed adjacent to the second corner than the second ground end 121a, and therefore, the second ground end 121a is disposed more corresponding to the middle of the fourth side 221 than the second free end 122b, and the ground position of the first ground end 111a connected to the foldable body 20 is closer to the middle of the fourth side 221. The second free end 122b is closer to the top of the electronic device 1 than the second ground end 121a is to the fourth corner 220b, so that the user may not easily grasp the second free end 122b, and the degradation of the second antenna performance caused by grasping the second free end 122b may be reduced or even avoided. It can be seen that the second free end 122b is disposed adjacent to the second corner 220a compared to the second ground end 121a, which ensures better antenna performance of the second antenna assembly 120.

When the foldable body 20 is in a folded state, the first antenna radiator 111 is disconnected from the first feed source S1 by the first switching circuit SW1, and the first antenna radiator 111 is coupled with the second antenna radiator 121.

When the foldable body 20 is in the folded state, the first antenna radiator 111 is disconnected from the first feed S1 by the first switching circuit SW1, and the first antenna radiator 111 is coupled with the second antenna radiator 121. In other words, the first antenna radiator 111 is coupled with the second antenna radiator 121 as a parasitic stub of the second antenna assembly 120. When the first antenna radiator 111 and the second antenna radiator 121 are coupled as parasitic branches of the second antenna assembly 120, the sum of the equivalent electrical lengths of the first antenna radiator 111 and the second antenna radiator 121 is different from the equivalent electrical length of the second antenna radiator 121, so that the second antenna assembly 120 in this embodiment can support more frequency bands.

Referring to fig. 9, fig. 9 is a circuit block diagram of an electronic device according to an embodiment of the application. The electronic device 1 further comprises a detector 50 and a controller 60. The detector 50 is configured to detect a state of the foldable body 20 to obtain a detection signal, wherein the state of the foldable body 20 includes a folded state and an unfolded state. The controller 60 is electrically connected to the detector 50 and the first switching circuit SW1, and the controller 60 is configured to determine whether the foldable main body 20 is in a folded state according to the detection signal, and generate a control signal when it is determined that the foldable main body 20 is in the folded state, where the control signal is used for the first switching circuit SW1. Specifically, when it is determined that the foldable body 20 is in the folded state, the control signal controls the first antenna assembly 110 to support the intermediate frequency band and/or the high frequency band, or controls the first switching circuit SW1 such that the first antenna radiator 111 is disconnected from the first feed S1 through the first switching circuit SW1.

The detector 50 is used to detect the state of the foldable body 20, wherein the detector 50 includes, but is not limited to, an angle sensor, a distance sensor, etc. capable of detecting an angle change or a distance change between the first body 210 and the second body 220.

The controller 60 determines whether the state of the foldable body 20 is a folded state or an unfolded state according to the detection signal. For example, when the controller 60 determines that the angle between the first body 210 and the second body 220 of the foldable body 20 is 180 ° or about 180 ° (e.g., 180 ° ± 10 °) based on the detection signal, the controller 60 determines that the first body 210 and the second body 220 are in the unfolded state. When the angle between the first body 210 and the second body 220 is 0 ° or less than 10 ° (not limited to this angle), the controller 60 determines that the first body 210 and the second body 220 of the foldable body 20 are in the folded state.

The envelope correlation coefficient reflects the cross correlation of the main antenna receiving pattern and the auxiliary antenna receiving pattern in the three-dimensional space. In reception diversity and MIMO reception, it is generally desirable that the radiation performance of the main and sub antennas can complement each other, and that the radiation patterns of the two antennas have a relatively large difference. The primary and secondary antenna patterns have no similarity, and the best effect can be achieved by receiving. The application obtains good ECC characteristics (namely smaller ECC) between the antenna components based on two factors of the polarization orthogonality principle of the far-field pattern of the antenna components and the difference of main radiation directions.

The present application analyzes the current distribution, far field pattern and ECC curve of the first antenna assembly 110 and the second antenna assembly 120 when the foldable body 20 is in the unfolded state.

Referring to fig. 10 and 11 together, fig. 10 is a schematic diagram illustrating a current distribution when the foldable body is in an unfolded state and the first antenna assembly is operated;

fig. 11 is a schematic diagram showing the current distribution when the second antenna is operated with the foldable body in the unfolded state. When (when)When the first antenna assembly 110 is used as a receiving antenna, the current distribution on the first antenna radiator 111 is as follows: the current on the first antenna radiator 111 is distributed from the first free end 111b to the first ground end 111a. Wherein the current on the first antenna radiator 111 is indicated in the schematic diagram by a dashed arrow. The first antenna radiator 111 is electrically connected to a reference ground (the foldable body 20) and is energized at the reference ground with a first longitudinal current I along a first edge 211 ₁₁ And a first lateral current I along the third side 213 ₁₂ . In this embodiment, the view angle in the present schematic diagram is taken as a reference in both the lateral direction and the longitudinal direction, the lateral direction is a direction perpendicular to the axis L0 or a direction approximately perpendicular to the axis L0, and the longitudinal direction is a direction parallel to the axis L0 or a direction approximately parallel to the axis L0. Wherein the first longitudinal current is opposite to the current direction on the first antenna radiator 111, and a first transverse current I ₁₂ Is directed from the end of the third side 213 connected to the first side 211 to the end of the third side 213 near the axis L0. The solid arrow direction is the equivalent current (first current I ₀₁ ) Is a direction of (2). First current I ₀₁ Is directed from the third corner 210b to the fourth corner 220b. It will be appreciated that the above-described current flow has a periodicity, so the direction of the current flow is not limited to the above-described direction, but may be reversed.

With continued reference to fig. 11, when the second antenna assemblies 120 are all receiving antennas, the current on the second antenna radiator 121 may be that the current on the second antenna radiator 121 flows from the second ground terminal 121a to the second free terminal 122b. Wherein the current on the second antenna radiator 121 is indicated by a dashed arrow. The second antenna radiator 121 is electrically connected to a reference ground (foldable body 20) and is excited to a second longitudinal current I at the reference ground ₂₁ And a second transverse current I ₂₂ . In the present embodiment, the transverse direction and the longitudinal direction are both referred to the view angle in the present schematic diagram, the transverse direction is a direction perpendicular to the axis L0 or a direction approximately perpendicular to the axis L0, and the longitudinal direction is a direction parallel to the axis L0 A direction or a direction approximately parallel to said axis L0. The second longitudinal current I ₂₁ Along the fourth side 221 and opposite to the current on the second antenna radiator 121. The second transverse current I ₂₂ Along the fifth side 222 and the third side 213, and along an end of the third side 213 facing away from the axis L0, toward an end of the fifth side 222 facing away from the axis L0. The solid arrow direction is the equivalent current (second current I ₀₂ ) Direction. The second current I ₀₂ It will be appreciated that the direction of the current is not limited to the above-described direction, but may be reversed, since the direction of the current is periodically directed from the first corner portion 210a to the second corner portion 220 a. It follows that in this embodiment, the first current I ₀₁ And the second current I ₀₂ Orthogonal. In other embodiments, the first current I ₀₁ And the second current I ₀₂ But may also be an intersection of non-orthogonal angles.

Referring to fig. 12, 13 and 14, fig. 12 is a far field pattern of the first antenna element when the foldable body is in the unfolded state; fig. 13 is a far field pattern of the second antenna assembly with the foldable body in an unfolded state; fig. 14 is an ECC diagram illustrating the first antenna assembly and the second antenna assembly when the foldable body is in an unfolded state. In the schematic diagram of the present embodiment, the horizontal axis represents frequency, the unit is GHz, and the vertical axis represents ECC. The curve in the figure is the ECC curve of the first antenna element 110 and the second antenna element 120. As can be seen from fig. 12 and 13, the connection line of the two zeros of the first antenna assembly 110 in fig. 12 is orthogonal to the connection line of the two zeros of the second antenna assembly 120 in fig. 13. Wherein the field null may indicate a far field electric field polarization direction of the antenna assembly. The far field electric field polarization direction of the first antenna assembly 110 is diagonally right downward, and the far field electric field polarization direction of the second antenna assembly 120 is diagonally left downward. The far field electric field polarization direction of the first antenna element 110 is orthogonal to the far field electric field polarization direction of the second antenna element 120, so as to achieve a low envelope correlation coefficient of the first antenna element 110 and the second antenna element 120. Of course, in other embodiments, the electric field polarization direction of the far field of the first antenna component 110 and the electric field polarization direction of the far field of the second antenna component 120 may also be an intersection of non-orthogonal angles, so as to achieve a lower envelope correlation coefficient of the first antenna component 110 and the second antenna component 120. As can be seen from the ECC curve in FIG. 14, the ECC finger is extremely small, about 0.023, and the ECC characteristics are excellent.

In addition, the main radiation directions of the first antenna element 110 and the second antenna element 120 are different, which also contributes to the decrease of the ECC characteristic. Since the main radiation directions of the antenna assemblies are distributed in the direction of the current lag, the main radiation directions of the first antenna assembly 110 and the second antenna assembly 120 are different due to the difference in the current lag directions of the first antenna assembly 110 and the second antenna assembly 120.

In summary, the far-field electric polarization directions of the first antenna assembly 110 and the second antenna assembly 120 when the foldable body 20 is in the unfolded state intersect or are orthogonal.

Details of the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130, and the fourth antenna assembly 140 for supporting MIMO in the first low frequency band when the foldable body 20 is in the unfolded state will be described below.

It should be noted that, MIMO provided by the embodiment of the present application refers to one or multiple transmissions and multiple receptions. For example, a 1-way transmit 4-way receive (1T 4R), a 2-way transmit 4-way receive (2T 4R), or a 4-way transmit 4-way receive (4T 4R), as described in more detail below.

In an embodiment, when the foldable body 20 is in the unfolded state, the first antenna assembly 110 or the second antenna assembly 120 is used for transmitting the transmission signal of the first low frequency band. The first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130, and the fourth antenna assembly 140 are configured to receive the received signal in the first low frequency band, so as to implement MIMO in the first low frequency band.

In this embodiment, when the foldable main body 20 is in the unfolded state, the first antenna assembly 110 or the second antenna assembly 120 is configured to transmit the transmission signal of the first low-frequency signal, and the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to receive the reception signal of the first low-frequency band, so that the antenna device 10 of the embodiment of the present application is 1T4R, and it is possible to implement that the reception signal of the first low-frequency signal has four reception channels, and to increase the system channel capacity without increasing the frequency spectrum resources and the antenna power.

It can be appreciated that, in another embodiment, when the foldable body 20 is in the unfolded state, the first antenna assembly 110 and the second antenna assembly 120 are configured to transmit the transmission signal in the first low frequency band, and the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to receive the reception signal in the first low frequency band, so as to implement MIMO in the first low frequency band.

When the foldable main body 20 is in the unfolded state, the first antenna assembly 110 and the second antenna assembly 120 are configured to transmit the transmission signal in the first low frequency band, and the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to receive the reception signal in the first low frequency band, so that the antenna device 10 according to the embodiment of the present application is 2T4R, and it is possible to implement that the reception signal of the first low frequency band has two transmission channels and four reception channels, and improve the system channel capacity without increasing the frequency spectrum resource and the antenna power.

In addition, in other embodiments, when the foldable body 20 is in the unfolded state, any two of the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are used for receiving and transmitting the transmission signal of the first low frequency band, and the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are used for receiving the reception signal of the first low frequency band. Therefore, the antenna device 10 may be made to be 2T4R, so that the first low frequency signal may have two transmission channels and four reception channels, and the system channel capacity may be improved without increasing the spectrum resource and the antenna power.

In another embodiment, when the foldable body 20 is in the unfolded state, the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to transmit the transmission signal of the first low frequency band, and the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to receive the reception signal of the first low frequency band, so as to implement MIMO of the first low frequency band.

The first antenna assembly 110 and the second antenna assembly 120 are configured to transmit the transmission signal in the first low frequency band, and the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to receive the reception signal in the first low frequency band, so that the antenna device 10 according to the embodiment of the application is 4T4R, and it is possible to implement that the reception signal of the first low frequency signal has four transmission channels and four reception channels, and improve the system channel capacity without increasing the frequency spectrum resource and the antenna power.

The envelope correlation coefficient reflects the cross correlation of the main antenna receiving pattern and the auxiliary antenna receiving pattern in the three-dimensional space. In reception diversity and MIMO reception, it is generally desirable that the radiation performance of the main and sub antennas can complement each other, and that the radiation patterns of the two antennas have a relatively large difference. The primary and secondary antenna patterns have no similarity, and the best effect can be achieved by receiving. The embodiment of the application also obtains good ECC characteristics between the antenna components based on the principle that the main radiation directions of the antenna components are different.

The third antenna assembly 130 includes a third antenna radiator 131. The third antenna radiator 131 and the first antenna radiator 111 are located on the same side of the axis L0 of the foldable main body 20, and are disposed corresponding to different sides of the foldable main body 20. The third antenna radiator 131 has a third ground end 131a and a third free end 131b. The direction from the third ground end 131a to the third free end 131b is a third direction. The fourth antenna includes a fourth antenna radiator 141. The fourth antenna radiator 141 and the second antenna radiator 121 are located on the same side of the axis L0 of the foldable body 20 and are disposed corresponding to different sides of the foldable body 20 (see fig. 7). Or a portion of the fourth antenna radiator 121 is disposed on the same side of the second antenna radiator 121 corresponding to the foldable body 20, and another portion of the fourth antenna radiator 141 is disposed on a different side of the second antenna radiator 121 corresponding to the foldable body 20 (see fig. 8). The fourth antenna radiator 141 has a fourth ground end 141a and a fourth free end 141b, and a direction from the fourth ground end 141a to the fourth free end 141b is a fourth direction, wherein the third direction is opposite to the fourth direction.

The third antenna radiator 131 and the first antenna radiator 111 are located on the same side of the axis L0 of the foldable body 20, and in this embodiment, the third antenna radiator 131 and the first antenna radiator 111 are located on the right side (view angle in the drawing) of the axis L0 of the foldable body 20, and the third antenna radiator 131 and the first antenna radiator 111 are disposed corresponding to the first body 210. The third antenna radiator 131 and the first antenna radiator 111 are disposed corresponding to different sides of the foldable main body 20, in this embodiment, the first antenna radiator 111 is disposed corresponding to the first side 211, and the third antenna radiator 131 is disposed corresponding to the third side 213. The third ground terminal 131a is electrically connected to the foldable body 20 to be grounded. In this embodiment, the third ground 131a is electrically connected to the first body 210. The third antenna radiator 131 has a third ground end 131a and a third free end 131b. The direction from the third ground end 131a to the third free end 131b is a third direction. In this embodiment, the third direction is the negative X-axis direction (view angle in the drawing).

The fourth antenna radiator 141 and the second antenna radiator 121 are located on the same side of the axis L0 of the foldable body 20, and in this embodiment, the fourth antenna radiator 141 and the second antenna radiator 121 are located on the left side of the axis L0 of the foldable body 20 (view angle shown in the present drawing), and the fourth antenna radiator 141 and the second antenna radiator 121 are disposed corresponding to the second body 220. The fourth antenna radiator 141 and the second antenna radiator 121 are disposed corresponding to different sides of the foldable main body 20, in this embodiment, the second antenna radiator 121 is disposed corresponding to the fourth side 221, a portion of the fourth antenna radiator 141 is disposed corresponding to the fourth side 221, and a portion of the fourth antenna radiator 141 is disposed corresponding to the sixth side 223.

Referring to fig. 7, the fourth antenna radiator 141 is disposed corresponding to the second corner 220a formed by the fourth side 221 and the sixth side 223, so that other devices (such as a speaker, an earphone socket, etc.) of the electronic apparatus 1 can be disposed corresponding to the fourth side 221.

In other embodiments, the second antenna radiator 121 is disposed corresponding to the fourth side 221, and the fourth antenna radiator 141 is disposed corresponding to the sixth side 223 (see fig. 8). In the present embodiment, the fourth direction is an X-axis positive direction (view angle in the present illustration).

In summary, in the present embodiment, the third direction is the negative X-axis direction, and the fourth direction is the positive X-axis direction. That is, in the present embodiment, the third direction is perpendicular to the axis L0 of the foldable body 20, and the third free end 131b is adjacent to the axis L0 as compared to the third ground end 131 a; the fourth direction is perpendicular to the axis L0 of the foldable body 20, and the fourth free end 141b is adjacent to the axis L0 as compared to the fourth ground end 141 a.

In other embodiments, the third direction is an X-axis positive direction and the fourth direction is an X-axis negative direction. That is, the third direction is perpendicular to the axis L0 of the foldable body 20, and the third free end 131b faces away from the axis L0 as compared to the third ground end 131 a; the fourth direction is perpendicular to the axis L0 of the foldable body 20, and the fourth free end 141b faces away from the axis L0 compared to the fourth ground end 141 a. The directions of the third direction and the fourth direction are not limited, and the third direction and the fourth direction are not limited as long as the directions are opposite. The advantageous effects of the embodiments of the present application will be described later in connection with the current distribution and the main radiation pattern.

With continued reference to fig. 7 and 8, the foldable body 20 includes a first corner 210a, a second corner 220a, a third corner 210b, and a fourth corner 220b. When the foldable body 20 is in the unfolded state, the first corner portion 210a and the second corner portion 220a are disposed diagonally, the third corner portion 210b and the fourth corner portion 220b are disposed diagonally, the first corner portion 210a and the third corner portion 210b are located on the same side of the axis L0 of the foldable body 20, and the second corner portion 220a and the fourth corner portion 220b are located on the same side of the axis L0 of the foldable body 20. The fourth antenna is located at the fourth corner, the first free end 111b is adjacent to the first corner 210a compared to the first ground end 111a, and the third free end 131b is away from the first corner 210a compared to the third ground end 131 a.

In the embodiment of the application, the first free end 111b is adjacent to the first corner portion 210a compared to the first ground end 111a, and the third free end 131b is opposite to the first corner portion 210a compared to the third ground end 131a, so that the opening of the first antenna radiator 111 and the opening of the third antenna radiator 131 are prevented from facing the same corner portion (the first corner portion 210 a). When the opening of the first antenna radiator 111 and the opening of the third antenna radiator 131 face the same corner portion (the first corner portion 210 a), the ECC between the third antenna assembly 130 and the fourth antenna assembly 140 may be deteriorated (i.e., ECC may be large).

The current distribution, main radiation direction and ECC curve of the third antenna assembly 130 and the fourth antenna assembly 140 when the foldable body 20 is in the unfolded state are described in detail below.

Referring to fig. 15 and fig. 16 together, fig. 15 is a schematic diagram illustrating a current distribution when the foldable main body is in an unfolded state and the third antenna assembly is operated;

fig. 16 is a schematic view of current distribution when the foldable body is in the unfolded state and the fourth antenna is operated. The current distribution of the third antenna radiator 131 on the third antenna assembly 130 is: the current on the third antenna radiator 131 is distributed to flow from the third free end 131b to the third ground end 131a. Wherein the current on the third antenna radiator 131 is represented in the schematic diagram by a dashed line. The third antenna radiator 131 is electrically connected to the reference ground (foldable body 20) and excites a third longitudinal current I along the first edge 211 at the reference ground ₃₁ And a third lateral current I along a third side 213 ₃₂ . In this embodiment, the view angle in the present schematic diagram is taken as a reference in both the lateral direction and the longitudinal direction, the lateral direction is a direction perpendicular to the axis L0 or a direction approximately perpendicular to the axis L0, and the longitudinal direction is a direction parallel to the axis L0 or a direction approximately parallel to the axis L0. The third transverse current I ₃₂ Is opposite to the current direction on the third antenna radiator 131, the third transverse current I ₃₂ Is the direction from the junction of the third side 213 and the first side 211 to the junction of the third side 213 away from the first side 211. The solid arrow is equivalent current (first equivalent current I ₀₃ ) In this embodiment, the direction of the first equivalent current is the negative X-axis direction.

The current distribution of the fourth antenna radiator 141 on the fourth antenna assembly 140 is: the current on the third antenna radiator 131 is distributed from the fourth free end 141b to the fourth ground end 141a. Wherein the current on the fourth antenna radiator 141 is represented in the schematic diagram by a dashed line. The fourth antenna radiator 141 is electrically connected to the reference ground (foldable body 20) and excites its fourth longitudinal current I along the fourth side 221 ₄₁ And a fourth lateral current I along the sixth edge 223 ₄₂ . In the present embodiment, the transverse direction and the longitudinal direction are both referred to the view angle in the present schematic diagram, the transverse direction is a direction perpendicular to the axis L0 or a direction approximately perpendicular to the axis L0, and the longitudinal direction is a direction parallel to the axis L0 A direction or a direction approximately parallel to said axis L0. Fourth lateral current I ₄₂ Opposite to the direction of the transverse current on the fourth antenna radiator 141.

In other words, the third antenna assembly 130 excites a first equivalent current I on the foldable body 20 ₀₃ The fourth antenna assembly 140 excites a second equivalent current I on the foldable body 20 ₀₄ The second equivalent current I ₀₄ With the first equivalent current I ₀₃ Is opposite to the flow direction of the first equivalent current I ₀₃ Is perpendicular to the axis L0 of the collapsible body 20, the second equivalent current I ₀₄ Is perpendicular to the axis L0 of the foldable body 20.

It will be appreciated that the radiation pattern of each antenna assembly radiates primarily by the metallic center (i.e., the foldable body 20), the antenna far field pattern is formed by the effective radiation of current on the metallic center, and the primary radiation direction radiates in the direction of the current phase lag. As can be seen from fig. 15, the third antenna assembly 130 excites a third transverse current I on the metal center ₃₂ Than the third longitudinal current I ₃₁ Is strong, so the third transverse current I ₃₂ To primarily affect the current in the main radiating direction of the third antenna assembly 130. The third transverse current I ₃₂ In the negative X-axis direction, the phase of the third transverse current will lag in the opposite direction along the X-axis, so that the main radiation direction of the third antenna element 130 is biased toward the negative X-axis direction. Accordingly, as can be seen from fig. 16, a fourth transverse current I is induced in the metal center by a fourth antenna assembly 140 ₄₂ Than the fourth longitudinal current I ₄₁ Is strong, so the fourth transverse current I ₄₂ To primarily affect the current in the main radiating direction of the fourth antenna component 140. Fourth lateral current I ₄₂ In the positive direction of the X-axis, the fourth transverse current I ₄₂ Is retarded in phase along the X-axis.

Referring to fig. 17, fig. 18 and fig. 19 together, fig. 17 is a far field pattern of the third antenna assembly when the foldable body is in the unfolded state;

fig. 18 is a far field pattern of the fourth antenna assembly with the foldable body in an unfolded state; fig. 19 is an ECC diagram illustrating the third antenna assembly and the fourth antenna assembly when the foldable body is in the unfolded state. In the schematic diagram of the present embodiment, the horizontal axis represents frequency, the unit is GHz, and the vertical axis represents ECC. The curve in the figure is the ECC curve of the third antenna element 130 and the fourth antenna element 140. As can be seen from the above analysis, the main radiation direction of the third antenna element 130 is biased toward the negative X-axis direction, and the main radiation direction of the fourth antenna element 140 is biased toward the positive X-axis direction, so that the main radiation direction of the third antenna element 130 is opposite to the main radiation direction of the fourth antenna element 140 when the foldable main body 20 is in the unfolded state. In other words, the third antenna assembly 130 and the fourth antenna assembly 140 have opposite main radiation directions when the foldable body 20 is in the unfolded state.

In the electronic device 1 according to the embodiment of the present application, the low ECC characteristic is achieved by using the large difference between the main radiation directions of the third antenna assembly 130 and the fourth antenna assembly 140, so as to further improve the antenna performance of the antenna device 10. Of course, in other embodiments, the main radiation direction of the third antenna assembly 130 and the main radiation direction of the fourth antenna assembly 140 may intersect, for example, at a relatively large angle (for example, in a range of 180°±20°), so that the main radiation direction of the third antenna assembly 130 is different from the main radiation direction of the fourth antenna assembly 140 to reduce the ECC coefficient.

In this embodiment, the ECC of the third antenna assembly 130 and the fourth antenna assembly 140 in the range of 0.758GHz-0.800GHz is about 0.42, and still smaller.

Besides the principle of polarization orthogonality of the far-field pattern between the first antenna element 110 and the second antenna element 120, and the principle that the third antenna element 130 and the fourth antenna element 140 are different based on the main radiation direction, the third antenna element 130 and the first antenna element 110 have a certain polarization orthogonality (non-same direction) of the far-field electric field, and the original far-field pattern is also different from the certain polarization, so that the ECC value is also smaller. Accordingly, the third antenna assembly 130 and the second antenna assembly 120 have a certain polarization orthogonality (non-homodromous) due to the far field electric field, and the original far field pattern is also different from a certain difference, so that the ECC value is also smaller. The fourth antenna and the first antenna component 110 also have a certain polarization orthogonality (non-homodromous) due to the far field electric field, and the original far field pattern is also different from a certain one, so that the ECC value is also smaller. The fourth antenna and the second antenna component 120 also have a certain polarization orthogonality (non-same direction) due to the far field electric field, and the original far field pattern is also different from a certain one, so that the ECC value is also smaller.

Referring to fig. 20 together, fig. 20 is an ECC diagram illustrating each antenna element when the foldable body is in an unfolded state. In the schematic diagram of the present embodiment, the horizontal axis represents frequency, the unit is GHz, and the vertical axis represents ECC. Curve (1) is the ECC curve of the third antenna element 130 and the fourth antenna element 140. Curve (2) is the ECC curve of the third antenna element 130 and the first antenna element 110. Curve (3) is the ECC curve of the third antenna element 130 and the second antenna element 120. Curve (4) is the ECC curve of the fourth antenna element 140 and the first antenna element 110. Curve (5) is the ECC curve of the fourth antenna element 140 and the second antenna element 120. Curve (6) is the ECC curve of the first antenna element 110 and the second antenna element 120. As can be seen, the ECC values of the respective curves are relatively small in the N28 band (703 MHz-788 MHz). Thus, the first antenna element 110, the second antenna element 120, the third antenna element 130, and the fourth antenna element 140 are well suited for four low frequency MIMO system applications.

With continued reference to fig. 7 and fig. 8, in this embodiment, at least one of the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 further includes a second switching circuit, where the second switching circuit is configured to adjust an effective electrical length of a radiator of the antenna assembly where the second switching circuit is located, so as to adjust a frequency band supported by the antenna assembly where the second switching circuit is located.

In the schematic diagram of the present embodiment, the second antenna assembly 120, the third antenna assembly 130, and the fourth antenna assembly 140 each include a second switching circuit, and in the schematic diagram of the present embodiment, the second switching circuit of the second antenna assembly 120 is denoted by SW2, the second switching circuit of the third antenna assembly 130 is denoted by SW3, and the second switching circuit of the fourth antenna assembly 140 is denoted by SW 4. It should be understood that the electronic device 1 provided by the embodiment of the present application should not be construed as being limited. As long as at least one of the second antenna assembly 120, the third antenna assembly 130, and the fourth antenna assembly 140 further comprises a second switching circuit. The second switching circuit is configured to adjust an effective electrical length of a radiator of an antenna assembly where the second switching circuit is located, so as to adjust a frequency band supported by the antenna assembly where the second switching circuit is located, and specifically includes: when the second antenna assembly 120 further includes a second switching circuit SW2, the second switching circuit SW2 is configured to adjust a frequency band supported by the second antenna assembly 120; when the third antenna assembly 130 further includes a second switching circuit SW3, the second switching circuit SW3 is configured to adjust a frequency band supported by the third antenna assembly 130; when the fourth antenna assembly 140 further includes a second switching circuit SW4, the second switching circuit SW4 is configured to adjust the frequency band supported by the fourth antenna assembly 140. It is understood that the structures of the second switching circuits in different antenna assemblies may be the same or different, which is not limited herein.

In the present embodiment, in the second antenna assembly 120, a connection point at which the second switching circuit SW2 is electrically connected to the second antenna radiator 121 is different from the second feeding point A2 of the second antenna radiator 121. In other embodiments, in the second antenna assembly 120, the connection point of the second switching circuit SW2 electrically connected to the second antenna radiator 121 is the same as the feeding point A2 of the second antenna radiator 121.

In the present embodiment, the third feeding point A3 of the third antenna radiator 131 is exemplified as the second switching circuit SW3, and in other embodiments, the connection point of the second switching circuit SW3 to the third antenna radiator 131 may be different from the position of the third feeding point A3. In other embodiments, the third antenna assembly 130 may not include the second switching circuit SW3.

In the fourth antenna assembly 140, a connection point at which the second switching circuit SW4 is electrically connected to the fourth antenna radiator 141 is different from the fourth feeding point A4 of the fourth antenna radiator 141. Since the fourth feeding point A4 of the fourth antenna radiator 141 is disposed adjacent to the fourth ground 141a, when the connection point of the second switching circuit SW4 electrically connected to the fourth antenna radiator 141 is the same as the fourth feeding point A4 of the fourth antenna radiator 141, the performance of the fourth antenna assembly 140 is degraded.

In summary, the second switching circuits in the second antenna element 120, the third antenna element 130 and the fourth antenna element 140 are electrically connected to the connection points of the radiators of the respective antenna elements as far as possible from the ground end of the respective radiators and close to the free ends of the respective radiators. For example, the second switching circuit SW4 in the fourth antenna assembly 140 is electrically connected to the connection point of the fourth antenna radiator 141 far from the fourth ground 141a.

When the foldable body 20 is in the folded state, the second antenna assembly 120 is configured to transmit a transmission signal of the first low frequency band and receive a main set reception signal of the first low frequency band. One of the third antenna assembly 130 and the fourth antenna assembly 140 is configured to transmit a transmission signal of the second low frequency band and receive a main set reception signal of the second low frequency band, and the other is configured to receive a diversity reception signal of the first low frequency band and a diversity reception signal of the second low frequency band, so as to implement CA or ENDC of the first low frequency band and the second low frequency band.

The first low frequency band is different from the second low frequency band. The first low frequency band may be an N28 frequency band, and the second low frequency band may be a B20 frequency band; alternatively, the first low frequency band may be a B20 band, and the second low frequency band may be an N28 band. Since the frequency ranges of the downlink signals in the B20 frequency band and the N28 frequency band are relatively close, the other of the third antenna element 130 and the fourth antenna element 140 can receive the diversity reception signal in the first low frequency band and the diversity reception signal in the second low frequency band. The specific frequency bands of the first low frequency band and the second low frequency band are not limited, and the first low frequency band and the second low frequency band are also located at low frequency as long as the first low frequency band is located at low frequency, and the first low frequency band and the second low frequency band are different.

One of the third antenna assembly 130 and the fourth antenna assembly 140 is configured to transmit a transmission signal of the second low frequency band and receive a main set reception signal of the second low frequency band, and the other is configured to receive a diversity reception signal of the first low frequency band and a diversity reception signal of the second low frequency band, and includes: the third antenna assembly 130 is configured to transmit a transmit signal of the second low frequency band and receive a main set of receive signals of the second low frequency band, and the fourth antenna assembly 140 is configured to receive a diversity receive signal of the first low frequency band and a diversity receive signal of the second low frequency band; alternatively, the fourth antenna element 140 is configured to transmit the transmission signal of the second low frequency band and receive the main set of reception signals of the second low frequency band, and the third antenna element 130 is configured to receive the diversity reception signals of the first low frequency band and the diversity reception signals of the second low frequency band.

In this embodiment, when the foldable main body 20 is in the folded state, the second antenna assembly 120 is configured to transmit the transmission signal of the first low frequency band and receive the main set of reception signals of the first low frequency band, the fourth antenna assembly 140 is configured to transmit the transmission signal of the second low frequency band and receive the main set of reception signals of the second low frequency band, and the third antenna assembly 130 is configured to receive the diversity reception signals of the first low frequency band and the diversity reception signals of the second low frequency band, so as to implement CA or ENDC of the first low frequency band and the second low frequency band.

In the embodiment of the present application, the location of other devices (such as an audio cavity and a microphone) in the electronic apparatus 1 results in the environment of the fourth antenna assembly 140 being better than that of the third antenna assembly 130, and the antenna apparatus 10 may have better transmission performance by using the fourth antenna assembly 140 to transmit the transmission signal of the second low frequency band and receive the main set of the second low frequency band.

Referring to fig. 21 and 22, fig. 21 is a schematic view illustrating a foldable main body of an electronic device according to still another embodiment of the present application in an unfolded state; fig. 22 is a schematic view of the foldable body of fig. 21 in a folded state. The electronic device 1 comprises a foldable body 20 and an antenna device 10. The foldable body 20 has an unfolded state and a folded state. The antenna device 10 includes a first antenna assembly 110, a second antenna assembly 120, a third antenna assembly 130, and a fourth antenna assembly 140 disposed on the foldable body 20.

The first antenna assembly 110 includes a first antenna radiator 111, a first ground end 111a and a first free end 111b of the first antenna radiator 111, the first antenna radiator 111 is connected to the foldable main body 20 through the first ground end 111a, and a direction from the first ground end 111a to the first free end 111b is a first direction.

The second antenna assembly 120 includes a second antenna radiator 121, the second antenna radiator 121 having a second ground end 121a and a second free end 122b, the second antenna radiator 121 being connected to the foldable body 20 through the second ground end 121a, a direction from the second ground end 121a to the second free end 122b being a second direction, the second direction being the same as the first direction.

The first antenna radiator 111 and the second antenna radiator 121 are respectively located at opposite sides of the foldable body 20 when the foldable body 20 is in the unfolded state; the first antenna radiator 111 and the second antenna radiator 121 are located on the same side of the foldable body 20 when the foldable body 20 is in the folded state.

The third antenna assembly 130 includes a third antenna radiator 131, the third antenna radiator 131 has a third ground end 131a and a third free end 131b, and a direction from the third ground end 131a to the third free end 131b is a third direction.

The fourth antenna assembly 140 includes a fourth antenna radiator 141, the fourth antenna radiator 141 having a fourth ground 141a and a fourth free end 141b, the fourth ground 141a to the fourth free end 141b being in a fourth direction, wherein the fourth direction is opposite to the third direction.

When the foldable body 20 is in the unfolded state, the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are used for supporting MIMO of the first low frequency band. The second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are configured to support CA or ENDC of the first low frequency band and the second low frequency band when the foldable body 20 is in a folded state.

When the foldable body 20 is in the unfolded state, the first antenna assembly 110, the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are used for supporting MIMO of the first low frequency band; when the foldable main body 20 is in the folded state, the specific cases of CA or ENDC for supporting the first low frequency band and the second low frequency band of the second antenna assembly 120, the third antenna assembly 130 and the fourth antenna assembly 140 are referred to in the foregoing description, and will not be repeated herein.

In summary, the low frequency band, such as the N28 (703-733 MHz uplink and 758-788MHz downlink), has the advantages of long coverage distance, good stability, and the like, and is very important for the 5G communication system to re-cultivate the low frequency band communication. Because the frequency band belongs to a lower frequency band, for the size of the mobile phone, the space occupied by the antenna is very large, especially when the MIMO supporting the low frequency band is designed, the environment is very compact, and the communication performance of the MIMO system can be influenced due to the large envelope correlation coefficient among antenna components. The method and the device for improving the space correlation among the multi-antenna components based on improving the performance of the MIMO system improve the rank of the MIMO channel matrix, so that the throughput rate of the communication system is optimized.

According to the electronic equipment 1 provided by the application, a new antenna architecture is designed on the foldable electronic equipment 1, and based on the improvement of the performance of the MIMO system, the spatial correlation among multiple antenna components is improved, so that the ECC is smaller, the rank of the MIMO channel matrix is improved, and the throughput rate of the communication system is optimized.

The antenna device 10 in the foldable electronic equipment 1 of the present application realizes the extremely low ECC characteristic under the orthogonal polarization and the better ECC characteristic (i.e. smaller ECC) under the opposite condition of the main radiation pattern by using the principle of orthogonal polarization direction of the far field electric field and the principle of different main radiation directions, so that the ECC coefficient between the first antenna assembly 110 and the second antenna assembly 120 in the unfolded state of the foldable main body 20 is relatively low, and the ECC coefficient between the third antenna assembly 130 and the fourth antenna assembly 140 in the unfolded state of the foldable main body 20 is relatively low, which can be well applied to the MIMO system. The four-antenna MIMO architecture of the present application can be applied to a low-frequency gold band to realize a four-low-frequency antenna MIMO architecture. When in the folded state, switching by the first switching circuit SW1 enables the antenna device 10 to support CA or ENDC of the first and second low frequency bands. Therefore, the electronic device 1 provided in the embodiment of the present application has better antenna performance and communication performance in both the unfolded state of the foldable main body 20 and the folded state of the foldable main body 20.

In the above embodiment, the first antenna radiator 111 and the second antenna radiator 121 are shown as being facing each other when the foldable body 20 is in the folded state. Referring to fig. 23 and 24 together, fig. 23 is a schematic view of a foldable main body in an unfolded state in an electronic device according to another embodiment of the application; fig. 24 is a schematic view of the foldable body in the electronic device of fig. 23 in a folded state. In the schematic diagram of the present embodiment, only the first antenna radiator 111 and the second antenna radiator 121 are illustrated, and the third antenna radiator 131 and the fourth antenna radiator 141 are not illustrated, and the first antenna radiator 111 and the second antenna radiator 121 may be combined in the present embodimentAs in any of the previous embodiments with respect to the third antenna radiator 131 and the fourth antenna radiator 141. When the foldable main body 20 is in a folded state, the first antenna radiator 111 and the second antenna radiator 121 are opposite to each other or are arranged in a staggered manner in the extending direction of the first antenna radiator 111, and when the first antenna radiator 111 and the second antenna radiator 121 are arranged in a staggered manner, the first antenna radiator 111 and the second antenna radiator 121 are staggered by a distance d ₁ ：d ₁ ≤λ ₁ /12，λ ₁ A wavelength corresponding to a frequency band supported by the second antenna assembly 120.

When the foldable main body 20 is in a folded state, the first antenna radiator 111 and the second antenna radiator 121 are opposite, a distance between the first antenna radiator 111 and the second antenna radiator 121 is smaller, and the first antenna radiator 111 and the second antenna radiator 121 are coupled. When the foldable main body 20 is in a folded state, the first antenna radiator 111 and the second antenna radiator 121 are arranged in a staggered manner in the extending direction of the first antenna radiator 111, and the first antenna radiator 111 is closer to the top (third side 213) of the foldable main body 20 than the second antenna radiator 121; alternatively, the first antenna radiator 111 is further from the top edge (third edge 213) of the foldable body 20 than the second antenna radiator 121. When the first antenna radiator 111 and the second antenna radiator 121 are arranged in a staggered manner, a distance d between the first antenna radiator 111 and the second antenna radiator 121 is set in a staggered manner ₁ ：d ₁ ≤λ ₁ /12，λ ₁ When the wavelength is the wavelength corresponding to the frequency band supported by the second antenna assembly 120, the first antenna radiator 111 and the second antenna radiator 121 have a better coupling effect, so that the second antenna assembly 120 can support more frequency bands.

In other embodiments, when the foldable body 20 is in the folded state, the first antenna radiator 111 and the second antenna radiator 121 may be offset from each other in a direction perpendicular to the axis L0 of the foldable body 20, for exampleMisalignment distance d between the first antenna radiator 111 and the second antenna radiator 121 ₂ ：d ₂ ≤λ ₁ /12，λ ₁ A wavelength corresponding to a frequency band supported by the second antenna assembly 120.

In the above embodiment, the first grounding end 111a is electrically connected to the foldable body 20 to be grounded. The first grounding terminal 111a may be directly or indirectly electrically connected to a reference ground (ground system) of the foldable body 20 when electrically connected to the foldable body 20 to be grounded. In other embodiments, the first ground 111a may also be electrically connected to a separate reference ground (also referred to as a ground system) other than the collapsible body 20 for grounding. For example, the first ground terminal 111a is electrically connected to the ground of the circuit board, or the ground of the screen.

In the above embodiment, the second grounding terminal 121a is electrically connected to the foldable body 20 to be grounded. The second grounding terminal 121a may be directly or indirectly electrically connected to the reference ground (ground system) of the foldable body 20 when electrically connected to the foldable body 20 to be grounded. In other embodiments, the second ground 121a may also be electrically connected to a separate reference ground (also referred to as a ground system) other than the collapsible body 20 for grounding. For example, the second ground terminal 121a is electrically connected to the ground of the circuit board, or the ground of the screen.

In the above embodiment, the third grounding terminal 131a is electrically connected to the foldable body 20 to be grounded. The third ground 131a may be directly or indirectly electrically connected to a reference ground (ground system) of the foldable body 20 when electrically connected to the foldable body 20 for grounding. In other embodiments, the third ground 131a may also be electrically connected to a separate reference ground (also referred to as a ground system) other than the collapsible body 20 for grounding. For example, the third ground 131a is electrically connected to the ground of the circuit board, or the ground of the screen.

In the above embodiment, the fourth ground 141a is electrically connected to the foldable body 20 to be grounded. The fourth ground 141a may be directly or indirectly electrically connected to a reference ground (ground system) of the foldable body 20 when electrically connected to the foldable body 20 to be grounded. In other embodiments, the fourth ground 141a may also be electrically connected to a separate reference ground (also referred to as a ground system) other than the collapsible body 20 for grounding. For example, the fourth ground 141a is electrically connected to the ground of the circuit board, or the ground of the screen.

While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the application, and such changes and modifications are intended to be included within the scope of the application.

Claims

1. An electronic device, the electronic device comprising:

2. The electronic device of claim 1, wherein the antenna arrangement further comprises a third antenna assembly and a fourth antenna assembly disposed on the foldable body;

when the foldable main body is in an unfolded state, the first antenna assembly, the second antenna assembly, the third antenna assembly and the fourth antenna assembly are used for supporting MIMO of the first low frequency band;

when the foldable body is in a folded state, the second antenna assembly, the third antenna assembly and the fourth antenna assembly are used for supporting CA or ENDC of the first low frequency band and the second low frequency band.

3. The electronic device of claim 1, wherein the foldable body comprises a first corner portion, a second corner portion, a third corner portion, and a fourth corner portion, the first corner portion being disposed diagonally to the second corner portion, the third corner portion being disposed diagonally to the fourth corner portion, and the first corner portion being on the same side of an axis of the foldable body as the third corner portion, the second corner portion being on the same side of the axis of the foldable body as the fourth corner portion when the foldable body is in an unfolded state; the first antenna radiator is located between the first corner portion and the third corner portion, the first direction being parallel to the axis; the second antenna radiator is located between the second corner portion and the fourth corner portion, the second direction being parallel to the axis.

4. The electronic device of claim 3, wherein the first free end is disposed adjacent to the third corner portion as compared to the first ground end; the second free end is disposed adjacent the second corner portion as compared to the second ground end.

5. The electronic device of claim 1, wherein a first antenna radiator is disconnected from the first feed by the first switching circuit and the first antenna radiator is coupled with the second antenna radiator when the foldable body is in a folded state.

6. The electronic device of claim 1, wherein the electronic device further comprises:

a detector for detecting a state of the foldable body to obtain a detection signal, wherein the state of the foldable body includes a folded state and an unfolded state; a kind of electronic device with high-pressure air-conditioning system

The controller is electrically connected with the detector and the first switching circuit, and is used for judging whether the foldable main body is in a folded state according to the detection signal, and controlling the first antenna assembly to support an intermediate frequency band and/or a high frequency band or controlling the first switching switch to enable the first antenna radiator to be disconnected with the first feed source through the first switching circuit when the foldable main body is judged to be in the folded state.

7. The electronic device according to claim 5, wherein when the foldable main body is in a folded state, the first antenna radiator and the second antenna radiator are aligned or offset in an extending direction of the first antenna radiator, and when the first antenna radiator and the second antenna radiator are offset, a distance d between the first antenna radiator and the second antenna radiator is offset ₁ ：d ₁ ≤λ ₁ /12，λ ₁ And a wavelength corresponding to a frequency band supported by the second antenna component.

8. The electronic device of claim 2, wherein the first antenna assembly or the second antenna assembly is configured to transmit the first low frequency band transmit signal when the foldable body is in the unfolded state, and the first antenna assembly, the second antenna assembly, the third antenna assembly, and the fourth antenna assembly are configured to receive the first low frequency band receive signal to implement MIMO of the first low frequency band.

9. The electronic device of claim 2, wherein the first antenna assembly and the second antenna assembly are configured to transmit the transmit signal in the first low frequency band when the foldable body is in the unfolded state, and the first antenna assembly, the second antenna assembly, the third antenna assembly, and the fourth antenna assembly are configured to receive the receive signal in the first low frequency band to implement MIMO in the first low frequency band.

10. The electronic device of claim 2, wherein the first antenna assembly, the second antenna assembly, the third antenna assembly, and the fourth antenna assembly are configured to transmit the first low frequency band of transmit signals when the foldable body is in the unfolded state, and the first antenna assembly, the second antenna assembly, the third antenna assembly, and the fourth antenna assembly are configured to receive the first low frequency band of receive signals to implement MIMO of the first low frequency band.

11. The electronic device of claim 8, wherein the third antenna assembly comprises a third antenna radiator on the same side of the axis of the foldable body as the first antenna radiator and disposed corresponding to a different side of the foldable body, the third antenna radiator having a third ground end and a third free end, the third ground end to the third free end being in a third direction; the fourth antenna comprises a fourth antenna radiator, the fourth antenna radiator and the second antenna radiator are located on the same side of the axis of the foldable main body and correspond to different sides of the foldable main body, or a part of the fourth radiation and the second antenna radiator are arranged corresponding to the same side of the foldable main body, the other part of the fourth antenna radiator and the second antenna radiator are arranged corresponding to different sides of the foldable main body, the fourth antenna radiator is provided with a fourth grounding end and a fourth free end, and the direction from the fourth grounding end to the fourth free end is a fourth direction, wherein the third direction is opposite to the fourth direction.

12. The electronic device of claim 11, wherein the third direction is perpendicular to an axis of the foldable body, the third free end being adjacent to the axis as compared to the third ground end; the fourth direction is perpendicular to an axis of the collapsible body, the fourth free end being adjacent to the axis as compared to the fourth ground end.

13. The electronic device of claim 12, wherein the foldable body comprises a first corner portion, a second corner portion, a third corner portion, and a fourth corner portion, the first corner portion being disposed diagonally to the second corner portion, the third corner portion being disposed diagonally to the fourth corner portion, and the first corner portion being on the same side of an axis of the foldable body as the third corner portion, the second corner portion being on the same side of the axis of the foldable body as the fourth corner portion when the foldable body is in the unfolded state; the fourth antenna is located at the fourth corner, the first free end is adjacent to the first corner portion compared to the first ground end, and the third free end is away from the first corner portion compared to the third ground end.

14. The electronic device of claim 11, wherein the third antenna assembly and the fourth antenna assembly are opposite in primary radiation direction when the foldable body is in an unfolded state.

15. The electronic device of claim 11 or 14, wherein the third antenna assembly excites a first equivalent current on the foldable body, the fourth antenna assembly excites a second equivalent current on the foldable body, the second equivalent current flowing in a direction opposite to the first equivalent current, and the first equivalent current flowing in a direction perpendicular to the axis of the foldable body, the second equivalent current flowing in a direction perpendicular to the axis of the foldable body.

16. The electronic device of claim 8, wherein at least one of the second antenna assembly, the third antenna assembly, and the fourth antenna assembly further comprises a second switching circuit for adjusting an effective electrical length of a radiator of the antenna assembly in which the second switching circuit is located to adjust a frequency band supported by the antenna assembly in which the second switching circuit is located.

17. The electronic device of claim 2, wherein when the foldable body is in a folded state, the second antenna assembly is configured to transmit a transmit signal of the first low frequency band and receive a primary set of receive signals of the first low frequency band, one of the third antenna assembly and the fourth antenna assembly is configured to transmit a transmit signal of the second low frequency band and receive a primary set of receive signals of the second low frequency band, and the other is configured to receive a diversity receive signal of the first low frequency band and a diversity receive signal of the second low frequency band, enabling CA or ENDC of the first low frequency band and the second low frequency band.

18. The electronic device of claim 17, wherein the second antenna assembly is configured to transmit a transmit signal of the first low frequency band and receive a primary set of receive signals of the first low frequency band, the fourth antenna assembly is configured to transmit a transmit signal of the second low frequency band and receive a primary set of receive signals of the second low frequency band, and the third antenna assembly is configured to receive a diversity receive signal of the first low frequency band and a diversity receive signal of the second low frequency band when the foldable body is in the folded state, enabling CA or ENDC for the first low frequency band and the second low frequency band.

19. The electronic device of claim 1, wherein the first antenna assembly and the second antenna assembly intersect or are orthogonal to a far field electrical polarization direction when the foldable body is in an unfolded state.

20. An electronic device, the electronic device comprising:

21. The electronic device of claim 20, wherein the foldable body comprises a first corner portion, a second corner portion, a third corner portion, and a fourth corner portion, the first corner portion being disposed diagonally to the second corner portion, the third corner portion being disposed diagonally to the fourth corner portion, and the first corner portion being on the same side of an axis of the foldable body as the third corner portion, the second corner portion being on the same side of the axis of the foldable body as the fourth corner portion when the foldable body is in the unfolded state; the first antenna radiator is located between the first corner portion and the third corner portion, the first direction being parallel to the axis; the second antenna radiator is located between the second corner portion and the fourth corner portion, the second direction being parallel to the axis.

22. The electronic device of claim 21, wherein the first free end is disposed adjacent to the third corner portion as compared to the first ground end; the second free end is disposed adjacent the second corner portion as compared to the second ground end.

23. The electronic device of claim 20, wherein the first antenna radiator and the second antenna radiator are aligned or offset in an extending direction of the first antenna radiator when the foldable body is in a folded state, and wherein the first antenna radiator and the second antenna radiator are offset by a distance d when the first antenna radiator and the second antenna radiator are offset ₁ ：d ₁ ≤λ ₁ /12，λ ₁ And a wavelength corresponding to a frequency band supported by the second antenna component.

24. The electronic device of claim 20, wherein the third antenna radiator is on a same side of the axis of the foldable body as the first antenna radiator and is disposed corresponding to a different side of the foldable body; the fourth antenna radiator and the second antenna radiator are positioned on the same side of the axis of the foldable main body and correspond to different sides of the foldable main body, or the fourth radiating part and the second antenna radiator correspond to the same side of the foldable main body, and the other part of the fourth antenna radiator and the second antenna radiator correspond to different sides of the foldable main body.

25. The electronic device of claim 24, wherein the third direction is perpendicular to an axis of the foldable body, the third free end being adjacent to the axis as compared to the third ground end; the fourth direction is perpendicular to an axis of the collapsible body, the fourth free end being adjacent to the axis as compared to the fourth ground end.

26. The electronic device of claim 25, wherein the foldable body comprises a first corner portion, a second corner portion, a third corner portion, and a fourth corner portion, the first corner portion being disposed diagonally to the second corner portion, the third corner portion being disposed diagonally to the fourth corner portion, and the first corner portion being on the same side of an axis of the foldable body as the third corner portion, the second corner portion being on the same side of the axis of the foldable body as the fourth corner portion when the foldable body is in the unfolded state; the fourth antenna is located at the fourth corner, the first free end is adjacent to the first corner portion compared to the first ground end, and the third free end is away from the first corner portion compared to the third ground end.

27. The electronic device of claim 20, wherein when the foldable body is in a folded state, the second antenna assembly is configured to transmit a transmit signal of the first low frequency band and receive a primary set of receive signals of the first low frequency band, one of the third antenna assembly and the fourth antenna assembly is configured to transmit a transmit signal of the second low frequency band and receive a primary set of receive signals of the second low frequency band, and the other is configured to receive a diversity receive signal of the first low frequency band and a diversity receive signal of the second low frequency band, enabling CA or ENDC of the first low frequency band and the second low frequency band.