WO2024078168A1

WO2024078168A1 - Antenna assembly, middle frame assembly, and electronic device

Info

Publication number: WO2024078168A1
Application number: PCT/CN2023/115563
Authority: WO
Inventors: 周林
Original assignee: Oppo广东移动通信有限公司
Priority date: 2022-10-10
Filing date: 2023-08-29
Publication date: 2024-04-18
Also published as: CN117913510A

Abstract

The present application discloses an antenna assembly, a middle frame assembly, and an electronic device, being related to the technical field of communications. In the present application, a radiator is provided with a first free end, a second free end, a first feed point, and a first grounding point, and the first feed is used to excite the radiator so as to support a first frequency band and a second frequency band; the first feed is electrically connected to the first feed point by means of a first frequency selection circuit, the first frequency selection circuit is grounded, and the current supporting the first frequency band is configured to flow from the ground, through the first frequency selection circuit, and to be inputted into the radiator; the first grounding point is grounded by means of a tuning circuit, and the current supporting the second frequency band is configured to flow from the ground, through the tuning circuit, and to be inputted into the radiator. In the present application, the feed-in of the first feed is implemented using one feed point, so that the antenna assembly implements wireless transmission functions on two frequency bands by means of a single radiator, effectively lowering the number of radiators, and further reducing the space occupied by the antenna assembly in the electronic device.

Description

Antenna assembly, middle frame assembly and electronic device

[Technical field]

The present application relates to the field of communication technology, and in particular to an antenna assembly, a middle frame assembly and an electronic device.

【Background technique】

As electronic devices have more and more communication functions, a single antenna can no longer meet people's needs for wireless communication. Therefore, many electronic devices are equipped with multiple antennas to receive different wireless signals, such as GSM (Global System for Mobile Communication), WiFi (Wireless-Fidelity) and other signals. However, multiple antennas will occupy a large area.

[Summary of the invention]

The present application provides an antenna assembly, the antenna assembly comprising a radiator, having a first free end, a second free end, a first feeding point and a first grounding point, the first grounding point being located between the first free end and the second free end, the first feeding point being located between the first free end and the first grounding point;

A first feed source, used to excite the radiator to support a first frequency band and a second frequency band;

A first frequency selection circuit is electrically connected between the first feeding point and the first feed source, so that the first feed source is electrically connected to the first feeding point through the first frequency selection circuit, the first frequency selection circuit is grounded, and the current supporting the first frequency band is configured to flow from the ground through the first frequency selection circuit to input into the radiator; and

A tuning circuit is electrically connected between the first grounding point and the ground, so that the first grounding point is grounded through the tuning circuit, and the current supporting the second frequency band is configured to flow from the ground through the tuning circuit to input into the radiator.

The present application provides an antenna assembly, the antenna assembly comprising:

A radiator, comprising a first free end, a second free end, a first feeding point, a second feeding point, a first grounding point, a second grounding point and a third grounding point, wherein the first grounding point is located between the first free end and the second free end, the first feeding point is located between the first free end and the first grounding point, the second feeding point is located between the first grounding point and the second free end, the second grounding point is located between the first grounding point and the second feeding point, and the third grounding point is located between the second feeding point and the second free end;

a first feed source, used for exciting a radiating portion of the radiator between the first feeding point and the first free end to generate a first resonance mode, and used for exciting a radiating portion of the radiator between the first grounding point and the first free end to generate a second resonance mode;

a first frequency selection circuit, electrically connected between the first feeding point and the first feed source, so that the first feed source is electrically connected to the first feeding point through the first frequency selection circuit, the first frequency selection circuit is grounded, and the current of the first resonant mode is configured to flow from the ground through the first frequency selection circuit and the first feeding point to the first free end;

a tuning circuit electrically connected between the first grounding point and ground, so that the first grounding point is grounded through the tuning circuit, and a current of the second resonant mode is configured to flow from ground through the tuning circuit and the first grounding point to the first free end;

a second feed source, used for exciting a radiating portion of the radiator between the second grounding point and the first free end to generate a third resonance mode, and used for exciting a radiating portion of the radiator between the second grounding point and the second free end to generate a fourth resonance mode;

a second frequency selection circuit, electrically connected between the second feed point and the second feed source, so that the second feed source is electrically connected to the second feed point through the second frequency selection circuit, the second frequency selection circuit is grounded, the first frequency selection circuit is configured to be disconnected when the second feed source excites the radiator, and to be connected when the first feed source excites the radiator, and the second frequency selection circuit is configured to be disconnected when the first feed source excites the radiator, and to be connected when the second feed source excites the radiator; and

A switching circuit is electrically connected between the third grounding point and the ground, so that the third grounding point is grounded through the switching circuit, and the switching circuit is used to adjust the frequency of the frequency band supported by the fourth resonance mode. The present application provides a middle frame assembly, including:

A substrate is provided with a ground plane;

A frame is arranged around the substrate; and

As in the antenna assembly described above, the radiator is arranged on the frame, and a gap is provided between the radiator and the ground plane.

The present application provides an electronic device, comprising:

Middle frame assembly, including:

Substrate;

a frame connected to the substrate, comprising a first frame, a second frame, a third frame and a fourth frame which are sequentially connected end to end and are arranged around the substrate, the first frame is arranged opposite to the third frame, the second frame is arranged opposite to the fourth frame, and the lengths of the first frame and the third frame are both shorter than the length of the second frame and shorter than the length of the fourth frame;

As the antenna assembly described above, the radiator is arranged on the first frame;

a battery cover, which is disposed on one side of the middle frame assembly and is respectively connected to the first frame, the second frame, the third frame and the fourth frame, and is disposed opposite to the substrate; and

A display screen is arranged on the other side of the middle frame assembly and is respectively connected to the first frame, the second frame, the third frame and the The fourth frame is connected to and arranged opposite to the substrate.

【Brief Description of the Drawings】

In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of the structure of an antenna assembly in some embodiments of the present application;

FIG2 is a schematic diagram of the structure of the first feed source and the first frequency selection circuit in the embodiment shown in FIG1 in other embodiments;

FIG3 is a schematic diagram of the structure of the tuning circuit in the embodiment shown in FIG1 in other embodiments;

FIG4 is a schematic structural diagram of the antenna assembly shown in FIG1 in another embodiment;

FIG5 is a schematic diagram of the structure of the first feed source and the first frequency selection circuit in the embodiment shown in FIG4 in other embodiments;

FIG6 is a schematic diagram of the structure of the second feed source and the second frequency selection circuit in the embodiment shown in FIG4 in other embodiments;

FIG7 is a schematic diagram of the structure of the antenna assembly shown in FIG4 in some other embodiments;

FIG8 is a schematic diagram of the structure of the antenna assembly shown in FIG7 in other embodiments;

FIG9 is a schematic diagram of the structure of the switching circuit shown in FIG8 in some embodiments;

FIG10 is a schematic diagram of the structure of the switching circuit in the embodiment shown in FIG9 in another embodiment of the antenna assembly;

FIG11 is a graph showing a return loss of the antenna assembly shown in FIG1 when excited by a first feed source in another embodiment;

FIG12 is a graph showing the total system efficiency of the antenna assembly shown in FIG1 in another embodiment when excited by the first feed source;

FIG13 is a graph showing a return loss of the antenna assembly shown in FIG7 when excited by a second feed source in another embodiment;

FIG14 is a graph showing the system total efficiency (System Total Efficiency) of the antenna assembly shown in FIG7 in another embodiment when excited by a second feed source;

FIG15 is an exploded view of an electronic device in one embodiment of the present application;

FIG16 is a schematic diagram of the structure of the frame assembly in the embodiment shown in FIG15 ;

FIG. 17 is a schematic diagram of the structural composition of an electronic device in an embodiment of the present application.

【Detailed ways】

The present application is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is particularly noted that the following implementation methods are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following implementation methods are only some implementation methods of the present application rather than all implementation methods. All other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The present application provides an antenna assembly, comprising:

A radiator, comprising a first free end, a second free end, a first feeding point and a first grounding point, wherein the first grounding point is located between the first free end and the second free end, and the first feeding point is located between the first free end and the first grounding point;

a first frequency selection circuit, electrically connected between the first feeding point and the first feed source, so that the first feed source is electrically connected to the first feeding point through the first frequency selection circuit, the first frequency selection circuit is grounded, and the current supporting the first frequency band is configured to flow from the ground through the first frequency selection circuit to input into the radiator; and

In some embodiments, the first frequency selection circuit includes:

A first matching circuit is electrically connected between the first feeding point and the first feed source so that the first feed source is electrically connected to the first feeding point through the first matching circuit. The first matching circuit is grounded, and the current supporting the first frequency band is configured to flow from the ground through the first matching circuit to be input into the radiator.

In some embodiments, the first matching circuit comprises:

a first capacitor, electrically connected between the first feeding point and the first feed source, so that the first feed source is electrically connected to the first feeding point through the first capacitor,

The second capacitor is electrically connected between the first capacitor and the ground, so that the first capacitor is grounded through the second capacitor, and the current supporting the first frequency band is configured to flow from the ground through the second capacitor and the first capacitor to input into the radiator.

In some embodiments, the capacitance of the second capacitor is 1 pF.

In some embodiments, the tuning circuit comprises:

The third capacitor is electrically connected between the first grounding point and the ground, so that the first grounding point is grounded through the third capacitor, and the current supporting the second frequency band is configured to flow from the ground through the third capacitor to input into the radiator.

In some embodiments, the capacitance of the third capacitor is 2.7 pF.

In some embodiments, the first feed source is configured to excite the radiating portion on the radiator located between the first feed point and the first free end to generate a first resonant mode supporting the first frequency band, the first resonant mode is a 1/4 wavelength inverted F antenna IFA antenna mode, and the current supporting the first frequency band is configured to flow from the first feed point to the first free end.

In some embodiments, the first frequency band includes a Wireless Fidelity WiFi 5G frequency band.

In some embodiments, the first feed source is configured to excite the radiating portion of the radiator located between the first grounding point and the first free end to generate a second resonant mode supporting the second frequency band, the second resonant mode is a 1/4 wavelength left-handed antenna mode, and the current supporting the second frequency band is configured to flow from the first grounding point to the first free end.

In some embodiments, the second frequency band includes the new radio N78 frequency band.

In some embodiments, the radiator further has a second feeding point located between the first ground point and the second free end, and the antenna assembly further includes:

A second feed source, used to excite the radiator;

a second frequency selection circuit, electrically connected between the second feed point and the second feed source, so that the second feed source is electrically connected to the second feed point through the second frequency selection circuit, the second frequency selection circuit is grounded, the first frequency selection circuit is configured to be in a high impedance state when the second feed source excites the radiator, and to be in a low impedance state when the first feed source excites the radiator, and the second frequency selection circuit is configured to be in a high impedance state when the first feed source excites the radiator, and to be in a low impedance state when the second feed source excites the radiator.

In some embodiments, the first frequency selection circuit is configured to be disconnected when the second feed source excites the radiator, and to be connected when the first feed source excites the radiator, and the second frequency selection circuit is configured to be disconnected when the first feed source excites the radiator, and to be connected when the second feed source excites the radiator.

In some embodiments, the first frequency selection circuit includes:

A first matching circuit, connected to the first feed source and grounded;

A first filter circuit is electrically connected between the first feeding point and the first matching circuit, so that the first matching circuit is electrically connected to the first feeding point through the first filter circuit, and the current supporting the first frequency band is configured to flow from the ground through the first matching circuit and the first filter circuit to input into the radiator, and the first filter circuit is configured to be disconnected when the second feed source excites the radiator, and to be connected when the first feed source excites the radiator.

In some embodiments, the first filtering circuit comprises:

a fourth capacitor, electrically connected between the first feeding point and the first matching circuit, so that the first matching circuit is electrically connected to the first feeding point through the fourth capacitor, and the current supporting the first frequency band is configured to flow through the fourth capacitor;

A first inductor is electrically connected between the first feeding point and the first matching circuit, so that the first matching circuit is electrically connected to the first feeding point through the first inductor.

In some embodiments, the second frequency selection circuit has a first electrical connection end electrically connected to the second feeding point and a second electrical connection end electrically connected to the second feed source, the first electrical connection end is electrically connected to the second electrical connection end, and the second frequency selection circuit includes:

a second matching circuit, electrically connected between the first electrical connection end and the ground, so that the first electrical connection end is grounded through the second matching circuit;

A second filtering circuit is electrically connected between the first electrical connection end and the ground so that the first electrical connection end is grounded through the second filtering circuit; the second filtering circuit is configured to control the second frequency selection circuit to be disconnected when the first feed source excites the radiator, and to be connected when the second feed source excites the radiator.

In some embodiments, the radiator also has a second grounding point located between the first grounding point and the second feeding point, the second grounding point is grounded, and the second feed source is configured to excite the radiating portion of the radiator located between the second grounding point and the first free end to generate a third resonant mode supporting a third frequency band, the third resonant mode is an IFA antenna mode, and the current of the third resonant mode is configured to flow from the second grounding point to the first free end.

In some embodiments, the third frequency band includes a Long Term Evolution LTE B20 frequency band.

In some embodiments, the radiator also has a second grounding point located between the first grounding point and the second feeding point, the second grounding point is grounded, and the second feed source is configured to excite the radiating portion of the radiator located between the second grounding point and the second free end to generate a fourth resonant mode supporting a fourth frequency band, the fourth resonant mode is an IFA antenna mode, and the current of the fourth resonant mode is configured to be a current flowing from the second grounding point to the second free end.

In some embodiments, the fourth frequency band includes at least one of an LTE B1 band, an LTE B3 band, an LTE B39 band, an LTE B40 band, or an LTE B41 band.

In some embodiments, the radiator further has a third grounding point located between the second feeding point and the second free end, and the antenna assembly further includes:

A switching circuit is electrically connected between the third grounding point and the ground, so that the third grounding point is grounded through the switching circuit, and the switching circuit is used to adjust the frequency of the fourth frequency band.

In some embodiments, the switching circuit comprises:

a switching switch having a plurality of connection terminals, a switching portion, and a common terminal electrically connected to the third grounding point, wherein the switching portion is electrically connected to the common terminal and is configured to be electrically connected to one of the plurality of connection terminals under the control of a control signal; and

At least one frequency selection branch, one end of the at least one frequency selection branch is electrically connected to a connection end of the plurality of connection ends in a one-to-one correspondence, and the other end is grounded.

In some embodiments, each of the at least one frequency-selective branches comprises a capacitor or an inductor.

The present application provides an antenna assembly, which includes:

a second feed source, used for exciting the radiating portion of the radiator between the second grounding point and the first free end to generate a third resonance mode, and used for exciting the radiating portion of the radiator between the second grounding point and the second free end to generate a fourth resonance mode;

A switching circuit is electrically connected between the third grounding point and the ground, so that the third grounding point is grounded through the switching circuit, and the switching circuit is used to adjust the frequency of the frequency band supported by the fourth resonance mode.

The present application provides a middle frame assembly, which includes:

A substrate is provided with a ground plane;

A frame is arranged around the substrate; and

The present application provides an electronic device, comprising:

Middle frame assembly, including:

Substrate;

The display screen is arranged on the other side of the middle frame assembly, and is respectively connected to the first frame, the second frame, the third frame and the fourth frame, and is arranged opposite to the substrate.

The present application provides an antenna assembly. The antenna assembly can be applied to an electronic device. The antenna assembly can support at least one of a WiFi frequency band, a medium-high frequency band, a NR (new air interface) frequency band, or a low frequency band.

As used herein, "electronic equipment" (which may also be referred to as "terminal" or "mobile terminal" or "electronic device") includes, but is not limited to, a device configured to receive/send communication signals via a wireline electrical connection (such as via a public switched telephone network (PSTN), a digital subscriber line (DSL), a digital cable, a direct cable electrical connection, and/or another data electrical connection/network) and/or via a wireless interface (for example, to a cellular network, a wireless local area network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and/or another communication terminal). A communication terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that may combine cellular radio telephones with data processing, fax, and data communication capabilities; PDAs that may include radio telephones, pagers, Internet/Intranet access, web browsers, notepads, calendars, and/or global positioning system (GPS) receivers; and conventional laptops and/or A handheld receiver or other electronic device that includes a radio telephone transceiver. A mobile phone is an electronic device equipped with a cellular communication module.

The antenna assembly can be a combination of one or more of a flexible printed circuit (FPC) antenna, a laser direct structuring (LDS) antenna, a print direct structuring (PDS) antenna, and a metal frame antenna (also called a metal branch antenna). Of course, the antenna assembly can also be other types of antennas, which will not be described in detail.

Please refer to FIG. 1, which is a schematic diagram of the structure of the antenna assembly in some embodiments of the present application. The antenna assembly 100 may include a radiator 10, a first feed source 20 for exciting the radiator 10, a first frequency selection circuit 30 electrically connected between the radiator 10 and the first feed source 20, and a tuning circuit 40 electrically connected between the first feed source 20 and the ground. The first feed source 20 can excite the radiator 10 to support the first frequency band and the second frequency band. The antenna assembly 100 can excite the radiator 10 through the first feed source 20 to achieve wireless transmission functions of two frequency bands, such as the first frequency band and the second frequency band, effectively reducing the number of radiators 10, and further reducing the space occupied by the antenna assembly 100 in the electronic device.

The terms "first", "second", "third", etc. in this application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include at least one of the features.

The radiator 10 may be, but is not limited to, an LDS radiator, or an FPC radiator, or a PDS radiator, or a metal branch radiator. In some embodiments, the radiator 10 may be a mechanical design antenna (MDA) radiator designed using the metal embedded in the electronic device itself.

The shape, structure and material of the radiator 10 are not specifically limited, and the shapes of the radiator 10 include but are not limited to bends, strips, sheets, rods, coatings, films, etc. When the radiator 10 is in a strip shape, there is no limitation on the extension trajectory of the radiator 10, so the radiator 10 can be extended in a straight line, a curve, a multi-segment bend, etc. The radiator 10 can be a line with uniform width on the extension trajectory, or a strip with varying widths such as a gradient width or a widened area.

In some embodiments, the total length of the radiator 10 may be 30-70 mm. In some embodiments, the total length of the radiator 10 may be 50 mm. It can be understood that the total length of the radiator 10 can be adjusted as needed.

The radiator 10 may have a first free end 11, a second free end 12, a first feeding point 13 and a first grounding point 14. The first feeding point 13 and the first grounding point 14 may be located between the first free end 11 and the second free end 12. The first feeding point 13 may be located between the first free end 11 and the first grounding point 14, and located on a side of the first grounding point 14 away from the second free end 12. That is, the first grounding point 14 may be located between the second free end 12 and the second feeding point 15.

In some embodiments, the two ends of the radiator 10, such as the first free end 11 and the second free end 12, may have gaps between them and other components. In some scenarios, when the antenna assembly 100 is applied to an electronic device, the gaps (i.e., two gaps) between the first free end 11 and the second free end 12 of the radiator 10 and other components in the electronic device are not easily held or blocked at the same time. Even if one of the two gaps is blocked, the radiator 10 can still send and receive electromagnetic wave signals. Therefore, the antenna assembly 100 can have better communication performance when applied to an electronic device.

Referring to FIG. 1 , the radiator 10 may be in a straight bar shape. The first free end 11 and the second free end 12 may be opposite ends of the radiator 10. In other embodiments, the radiator 10 may be in a bent shape. The first free end 11 and the second free end 12 may not be opposite in a straight line. However, the first free end 11 and the second free end 12 may be two ends of the radiator 10. In some embodiments, on the extension trajectory of the radiator 10, the distance between the first free end 11 and the second free end 12 may be the total length of the radiator 10.

1 , the first feed source 20 may be indirectly connected to the first feed point 13 via the first frequency selection circuit 30. The first feed source 20 may excite the radiator 10 to support the first frequency band and the second frequency band.

In some embodiments, the first frequency band may be a mid-high frequency band or a low frequency band.

In some embodiments, the first frequency band may be a WiFi frequency band or a NR frequency band.

In some embodiments, the first frequency band may be a WiFi frequency band. In some embodiments, the first frequency band may be a WiFi 5G frequency band.

In some embodiments, the first feed source 20 can excite the radiating portion of the radiator 10 between the first free end 11 and the first feeding point 13 to generate a first resonance mode supporting a first frequency band.

In some embodiments, the first resonant mode is an inverted-F antenna (IFA) antenna mode. In some embodiments, the first resonant mode is a 1/4 wavelength IFA antenna mode.

In some embodiments, the current of the first resonant mode includes a current I1 flowing from the first feeding point 13 to the first free end 11 .

In some embodiments, the second frequency band may be a mid-high frequency band or a low frequency band.

In some embodiments, the second frequency band may be a WiFi frequency band or a NR frequency band.

In some embodiments, the second frequency band may be a NR high frequency band. In some embodiments, the second frequency band may be an N78 frequency band (3.4 GHz-3.6 GHz).

In some embodiments, the first feed source 20 can excite the radiating portion of the radiator 10 between the first free end 11 and the first ground point 14 to generate a second resonance mode supporting a second frequency band.

In some embodiments, the second resonant mode may be a left-handed antenna mode (a mode of a composite left-handed transmission line structure). In some embodiments, the second resonant mode may be a 1/4 wavelength left-handed antenna mode.

In some embodiments, the current of the second resonance mode includes a current I2 flowing from the first ground point 14 to the first free end 11 .

1 , the first frequency selection circuit 30 is electrically connected between the first feeding point 13 and the first feed source 20. That is, the first feed source 20 can be electrically connected to the first feeding point 13 through the first frequency selection circuit 30. The first frequency selection circuit 30 can be directly grounded, so that the current I1 supporting the first frequency band can flow from the ground through the first frequency selection circuit 30 to be input into the radiator 10.

In some embodiments, the first frequency selection circuit 30 may be composed of a switch control circuit and/or a load circuit, or may be composed of an adjustable capacitor (which may also be replaced by a fixed value capacitor) and/or an adjustable inductor. In one embodiment, the switch control circuit may be a switch chip with a switch function, or may be a single-pole multi-throw switch or a single-pole single-throw switch.

Please refer to Figure 2, which is a schematic diagram of the structure of the first feed source 20 and the first frequency selection circuit 30 in other embodiments in the embodiment shown in Figure 1. The first frequency selection circuit 30 may include a first matching circuit 31. One end of the first matching circuit 31 is connected to the first feed source 20, the other end is directly or indirectly connected to the first feeding point 13, and another end is grounded.

In some embodiments, the first matching circuit 31 may include a second capacitor C2 with one end grounded and a first capacitor C1 with one end electrically connected to the other end of the second capacitor C2. The other end of the first capacitor C1 is electrically connected to the first feeding point 13. The other end of the second capacitor C2 may also be electrically connected to the first feed source 20.

In some embodiments, the second capacitor C2 and the first capacitor C1 may flow current I1 when the radiator 10 supports the first frequency band. Specifically, the current I1 may flow from the ground through the second capacitor C2 and the first capacitor C1 and flow to the first feeding point 13. Therefore, the second capacitor C2 may be a virtual return point.

In some embodiments, the capacitance of the second capacitor C2 may be 1 pF.

1 , the tuning circuit 40 can be used to adjust the frequency of the second frequency band. The tuning circuit 40 is electrically connected between the first ground point 14 and the ground. That is, the first ground point 14 can be grounded through the tuning circuit 40. In some embodiments, the current I2 supporting the second frequency band can flow from the ground through the tuning circuit 40 to be input into the radiator 10.

In some embodiments, the tuning circuit 40 may be composed of a switch control circuit and/or a load circuit, or may be composed of an adjustable capacitor (which may also be replaced by a fixed value capacitor) and/or an adjustable inductor. In one embodiment, the switch control circuit may be a switch chip with a switch function, or may be a single-pole multi-throw switch or a single-pole single-throw switch.

Please refer to Fig. 3, which is a schematic diagram of the structure of the tuning circuit 40 in other embodiments in the embodiment shown in Fig. 1. The tuning circuit 40 may include a third capacitor C3 electrically connected between the first grounding point 14 and the ground. The first grounding point 14 may be grounded through the third capacitor C3.

In some embodiments, the third capacitor C3 can flow current I2 when the radiator 10 supports the second frequency band. Specifically, the current I2 can flow from the ground through the third capacitor C3 and flow to the first ground point 14. Therefore, the third capacitor C3 can be a virtual return point.

In some embodiments, the capacitance of the third capacitor C3 is 2.7 pF.

In some embodiments, the tuning circuit 40, such as the third capacitor C3, is configured so that the second resonant mode is a left-handed antenna mode that uses capacitive coupling feeding to form a composite left-handed transmission line structure.

Please refer to FIG. 4, which is a schematic diagram of the structure of the antenna assembly 100 shown in FIG. 1 in another embodiment. The radiator 10 may also have a second feeding point 15 located between the second free end 12 and the first grounding point 14. Accordingly, the antenna assembly 100 may also include a second feed source 50. The second feed source 50 may be directly or indirectly electrically connected to the second feeding point 15. The second feed source 50 may excite the radiator 10.

4 , in the antenna assembly 100, the circuit electrically connecting the first feed source 20 to the first feed point 13, such as the first frequency selection circuit 30, can be set to be in a high impedance state when the second feed source 50 excites the radiator 10, and in a low impedance state when the first feed source 20 excites the radiator 10. Furthermore, the antenna assembly 100 can improve the isolation between the first feed source 20 and the second feed source 50 when the second feed source 50 excites the radiator 10.

In some embodiments, in the antenna assembly 100 , a circuit electrically connecting the first feed source 20 to the first feed point 13 , such as the first frequency selection circuit 30 , can be set to be disconnected when the second feed source 50 excites the radiator 10 , and to be connected when the first feed source 20 excites the radiator 10 .

Please refer to FIG. 5, which is a schematic diagram of the structure of the first feed source 20 and the first frequency selection circuit 30 in the embodiment shown in FIG. 4 in other embodiments. The first frequency selection circuit 30 may also include a first filter circuit 32. The first filter circuit 32 is electrically connected between the first feed point 13 and the first matching circuit 31, such as the first capacitor C1. That is, the first feed point 13 is electrically connected to the first matching circuit 31, such as the first capacitor C1, through the first filter circuit 32.

In some embodiments, the first filter circuit 32 can control the first frequency selection circuit 30 to be in a low impedance state when the first feed source 20 excites the radiator 10, and to be in a high impedance state when the second feed source 50 excites the radiator 10. In some embodiments, the first filter circuit 32 can control the first frequency selection circuit 30 to be in a short circuit state when the first feed source 20 excites the radiator 10, and to be in an open circuit state when the second feed source 50 excites the radiator 10. In some embodiments, the first filter circuit 32 can control the first frequency selection circuit 30 to be connected when the first feed source 20 excites the radiator 10, and to be disconnected when the second feed source 50 excites the radiator 10.

5 , the first filter circuit 32 may include a fourth capacitor C4 electrically connected between the first feeding point 13 and the first matching circuit 31, such as the first capacitor C1, and a first inductor L1 electrically connected between the first feeding point 13 and the first matching circuit 31, such as the first capacitor C1. That is, the first feeding point 13 may be electrically connected to the first matching circuit 31, such as the first capacitor C1, through the fourth capacitor C4 and the first inductor L1, respectively.

In some embodiments, one end of the fourth capacitor C4 and the first inductor L1 electrically connected to the first matching circuit 31 is electrically connected to one end of the first capacitor C1. The fourth capacitor C4 and the first inductor L1 are connected in parallel to resonate to form a low-resistance high-pass filter circuit. That is, the first filter circuit 32 can be a low-resistance high-pass filter circuit to improve the isolation between the first feed source 20 and the second feed source 50.

In some embodiments, the fourth capacitor C4 can flow current I1 when the radiator 10 supports the first frequency band. Specifically, the current I1 can flow from ground through the first matching circuit 31 (eg, the second capacitor C2, the first capacitor C1), the fourth capacitor C4 and flow to the first feeding point 13.

4 , in the antenna assembly 100, the circuit electrically connecting the second feed source 50 to the second feed point 15 can be set to be in a high impedance state when the first feed source 20 excites the radiator 10, and in a low impedance state when the second feed source 50 excites the radiator 10. Thus, the antenna assembly 100 can improve the isolation between the first feed source 20 and the second feed source 50 when the first feed source 20 excites the radiator 10.

In some embodiments, in the antenna assembly 100 , the circuit electrically connecting the second feed source 50 to the second feed point 15 can be set to be in an open circuit state when the first feed source 20 excites the radiator 10 , and in a short circuit state when the second feed source 50 excites the radiator 10 .

In some embodiments, in the antenna assembly 100 , the circuit electrically connecting the second feed source 50 to the second feed point 15 may be set to be disconnected when the first feed source 20 excites the radiator 10 , and connected when the second feed source 50 excites the radiator 10 .

Referring to FIG. 4 , the antenna assembly 100 may further include a second frequency selection circuit 60 electrically connected between the second feed 50 and the second feed point 15. The second feed 50 may be electrically connected to the second feed point 15 via the second frequency selection circuit 60. That is, the second frequency selection circuit 60 may serve as a circuit for electrically connecting the second feed 50 to the second feed point 15. Furthermore, the second frequency selection circuit 60 is configured to be in a high impedance state when the first feed 20 excites the radiator 10, and in a low impedance state when the second feed 50 excites the radiator 10. In some embodiments, the second frequency selection circuit 60 is configured to be in an open circuit state when the first feed 20 excites the radiator 10, and in a short circuit state when the second feed 50 excites the radiator 10. In some embodiments, the second frequency selection circuit 60 is configured to be disconnected when the first feed 20 excites the radiator 10, and connected when the second feed 50 excites the radiator 10.

In some embodiments, the second frequency selection circuit 60 may be composed of a switch control circuit and/or a load circuit, or may be composed of an adjustable capacitor (which may also be replaced by a fixed value capacitor) and/or an adjustable inductor. In one embodiment, the switch control circuit may be a switch chip with a switch function, or may be a single-pole multi-throw switch or a single-pole single-throw switch.

Please refer to Fig. 6, which is a schematic diagram of the structure of the second feed source 50 and the second frequency selection circuit 60 in other embodiments in the embodiment shown in Fig. 4. The second frequency selection circuit 60 may have a first end 61 and a second end 62. The first end 61 may be electrically connected to the second feed source 50, and the second end 62 may be electrically connected to the second feeding point 15.

The second frequency selection circuit 60 may include a second matching circuit 63 and a second filter circuit 64. One end of the second matching circuit 63 is electrically connected to one end of the second filter circuit 64 to form a first end 61 and a second end 62. That is, the second matching circuit 63 and the second filter circuit 64 may both be electrically connected between the second feeding point 15 and the ground, and the second feed source 50 may be directly electrically connected to the second feeding point 15, so that the second feeding point 15 may be grounded through the second matching circuit 63 and the second filter circuit 64, respectively.

In some embodiments, the second matching circuit 63 may include a second inductor L2 electrically connected between the second terminal 62 and the ground. The second terminal 62 is grounded through the second inductor L2.

In some embodiments, the second filter circuit 64 can control the second frequency selection circuit 60 to be in a high impedance state when the first feed source 20 excites the radiator 10 , and to be in a low impedance state when the second feed source 50 excites the radiator 10 .

In some embodiments, the second filtering circuit 64 can control the second frequency selection circuit 60 to be in an open circuit state when the first feed source 20 excites the radiator 10 , and to be in a short circuit state when the second feed source 50 excites the radiator 10 .

In some embodiments, the second filtering circuit 64 can control the second frequency selection circuit 60 to be disconnected when the first feed source 20 excites the radiator 10 , and to be connected when the second feed source 50 excites the radiator 10 .

In some embodiments, the second filter circuit 64 may include a third inductor L3 and a fifth capacitor C5 electrically connected between the second end 62 and the ground. The third inductor L3 and the fifth capacitor C5 are connected in series. The second end 62 is connected to the ground through the third inductor L3 and the fifth capacitor C5 in sequence. The third inductor L3 and the fifth capacitor C5 can form a low-pass high-resistance filter circuit. That is, the second filter circuit 64 can be a low-pass high-resistance filter circuit to improve the isolation between the first feed source 20 and the second feed source 50.

In some embodiments, the capacitance of the fifth capacitor C5 is 2.7 pF.

The second feed source 50 can excite the radiator 10 to generate a resonant mode supporting multiple frequency bands (e.g., part or all of at least one of the mid-high frequency band and the low frequency band). Please refer to FIG. 7, which is a schematic diagram of the structure of the antenna assembly 100 shown in FIG. 4 in some other embodiments. The radiator 10 may also have a second grounding point 16 located between the first grounding point 14 and the second feed point 15. The second grounding point 16 is grounded.

In some embodiments, the second feed source 50 can excite the radiating portion of the radiator 10 between the first free end 11 and the second ground point 16 to generate a third resonance mode supporting a third frequency band.

In some embodiments, the third frequency band may be a frequency band supporting Long Term Evolution (LTE). In some embodiments, the third frequency band may be a LTE low frequency band. In some embodiments, the third frequency band may be a LTE B20 frequency band (791 MHz-861 MHz).

In some embodiments, the third resonance mode may be an IFA antenna mode. The current I3 of the third resonance mode may flow from the second ground point 16 to the first free end 11 .

In some embodiments, the second feed source 50 can excite the radiating portion of the radiator 10 between the second ground point 16 and the second free end 12 to generate a fourth resonance mode supporting a fourth frequency band.

In some embodiments, the fourth frequency band may be a medium-high frequency band (1710 MHz-2690 MHz). In some embodiments, the fourth frequency band may be a medium-high frequency band of LTE. In some embodiments, the fourth frequency band may be at least one of the LTE B3 band, the LTE B1 band, the LTE B39 band, the LTE B40 band, or the LTE B41 band.

In some embodiments, the fourth resonant mode is an IFA antenna mode.

In some embodiments, the current of the fourth resonant mode may include a current I4 flowing from the second ground point 16 to the second free end 12 .

Please refer to FIG8, which is a schematic diagram of the structure of the antenna assembly 100 shown in FIG7 in other embodiments. A third grounding point 17 is provided between the second free end 12 and the second feeding point 15 .

The antenna assembly 100 may further include a switching circuit 70 electrically connected between the third ground point 17 and the ground. The third ground point 17 is grounded through the switching circuit 70. The switching circuit 70 may adjust the frequency of the fourth frequency band.

The switching circuit 70 can switch and select frequencies among multiple sub-bands in the fourth frequency band. For example, the switching circuit 70 can switch and select frequencies among LTE B3 band, LTE B1 band, LTE B39 band, LTE B40 band, and LTE B41 band in the fourth frequency band.

The switching circuit 70 may be composed of a switch control circuit and/or a load circuit, or may be composed of an adjustable capacitor (which may also be replaced by a fixed value capacitor) and/or an adjustable inductor. In one embodiment, the switch control circuit may be a switch chip having a switch function, or may be a single-pole multi-throw switch or a single-pole single-throw switch.

Please refer to Fig. 9, which is a schematic diagram of the structure of the switching circuit 70 shown in Fig. 8 in some embodiments. The switching circuit 70 may include a switching switch 71 and at least one frequency selection branch 72.

The switch 71 has a common terminal 711 electrically connected to the third grounding point 17, a plurality of connection terminals 712, and a switching portion 713. The switching portion 713 can be electrically connected to the common terminal 711. The switching portion 713 can be electrically connected to one connection terminal 712 under the control of a control signal (which can come from an electronic device such as a processor or other electronic devices).

One end of each frequency selection branch 72 is electrically connected to a connection terminal 712 in a one-to-one correspondence, and the other end is grounded.

Please refer to Figure 9. The switching part 713 can be selectively electrically connected to different connection ends 712, so that one end of different frequency selection branches 72 is electrically connected to the second feeding point 15 and the other end is grounded, thereby making the radiating part located between the second grounding point 16 and the second free end 12 on the radiator 10 have different effective electrical lengths in different states.

It can be understood that the number of frequency selection branches 72 shown in the figure should not be understood as a limitation on the number of frequency selection branches 72 provided in the implementation manner of the present application.

In some embodiments, each frequency selection branch 72 may include a capacitor, an inductor, or a combination of a capacitor and an inductor.

In one embodiment, when there are multiple frequency selection branches 72, each frequency selection branch 72 may be different, so that when different frequency selection branches 72 are electrically connected to the radiator 10, the degree of adjustment of the electrical length of the radiator 10 is different. Furthermore, the frequency selection is switched among multiple sub-bands in the fourth frequency band, such as LTE B3 band, LTE B1 band, LTE B39 band, LTE B40 band, LTE B41 band, etc.

It should be noted that each frequency selection branch 72 referred to here is different, and the devices included in each frequency selection branch 72 may be different; or, the devices included are the same, but the connection relationship between the devices is different; or, the devices included are the same and the connection relationship is the same, but the parameters of the devices (such as capacitance value or inductance) are different.

In addition, since the radiator 10 supports more sub-bands in the fourth frequency band, in order to achieve better adjustment of the LB frequency band, the number of the frequency selection branches 72 is usually greater than or equal to two.

It can be understood that there can be multiple switches 71 in FIG9 , and each frequency selection branch 72 is electrically connected to a switch 71 in a one-to-one correspondence. Please refer to FIG10 , which is a schematic diagram of the structure of the switching circuit 70 in the embodiment shown in FIG9 in another embodiment of the antenna assembly 100. Each frequency selection branch 72 is electrically connected to a switch 71 in a one-to-one correspondence.

In addition, the grounded end of the switch 71 in FIG. 9 may be electrically connected to the third grounding point 17 , and correspondingly, the end electrically connected to the third grounding point 17 may be directly grounded.

In some embodiments, the frequency selection branch 72 may include a first frequency selection branch 721, a second frequency selection branch 722, a third frequency selection branch 723, and a fourth frequency selection branch 724. The first frequency selection branch 721, the second frequency selection branch 722, the third frequency selection branch 723, and the fourth frequency selection branch 724 are all electrically connected to a connection terminal 712 at one end, and are all grounded at the other end.

In some embodiments, the first frequency selection branch 721 may be a capacitor. In some embodiments, the second frequency selection branch 722, the third frequency selection branch 723 and the fourth frequency selection branch 724 may all be inductors.

In one embodiment, referring to FIG. 9 and FIG. 10 , taking the multiple sub-bands under the fourth frequency band as LTE B3 frequency band, LTE B1 frequency band, LTE B39 frequency band, LTE B40 frequency band, and LTE B41 frequency band as an example, when the first frequency selection branch 721, the second frequency selection branch 722, the third frequency selection branch 723, and the fourth frequency selection branch 724 are used for frequency selection, the following table shows:

Please refer to Figure 8, in which the first resonance mode corresponding to the current I1 can operate in the WiFi5G frequency band. The second resonance mode corresponding to the current I2 can operate in the N78 frequency band (3.4GHz-3.6GHz). The third resonance mode corresponding to the current I3 can operate in the LTE B20 frequency band (791MHz-861MHz). The fourth resonance mode corresponding to the current I4 can operate in the LTE medium and high frequency bands such as the LTE B3 band, the LTE B1 band, the LTE B39 band, the LTE B40 band, and the LTE B41 band. Furthermore, the antenna assembly 100 can realize the ENDC (dual connection of 4G wireless access network and 5G-NR (E-UTRAN New Radio-Dual Connectivity, referred to as ENDC) combination) of the N78 frequency band and the WiFi5G frequency band, and can also realize the LTE B20 frequency band and the medium and high frequency bands (for example, the LTE medium and high frequency bands such as the LTE B3 band, the LTE B1 band, the LTE B39 band, LTE B40 band, LTE B41 band, etc.) ENDC.

Since the current path of current I4 does not overlap with the current path of current I1 and the current path of current I2, there is good isolation performance between the medium and high frequency bands and the N78 frequency band, and there is good isolation performance between the medium and high frequency bands and the WiFi5G frequency band.

Please refer to Figure 11, which is a return loss curve of the antenna assembly 100 shown in Figure 1 in another embodiment when excited by the first feed source 20, with the horizontal axis being frequency (GHz) and the vertical axis being return loss (dB). Curve A is the return loss curve of the antenna assembly 100 under the first feed source 20. Curve A has A1 (3.4959, -4.9113), A2 (5.4985, -11.065), and A3 (4.8473, -3.7118). It can be seen that the antenna assembly 100 has good antenna performance in the first frequency band (e.g., WiFi5G frequency band) and the second frequency band (e.g., N78 frequency band), and thus has a good working condition and can meet engineering requirements.

Please refer to Figure 12, which is a system total efficiency curve of the antenna assembly 100 shown in Figure 1 in another embodiment when excited by the first feed source 20. The horizontal axis is frequency (GHz) and the vertical axis is system total efficiency (dB). Curve B is the system total efficiency curve of the antenna assembly 100 under the first feed source 20. Curve B has B1 (3.339, -3.7824), B2 (5.3513, -3.8836), and B3 (5.6551, -3.8342). It can be seen that the antenna assembly 100 has good antenna performance in the first frequency band (such as WiFi5G frequency band) and the second frequency band (such as N78 frequency band), and thus has a good working condition and can meet engineering requirements.

Please refer to FIG. 13 , which is a return loss curve of the antenna assembly 100 shown in FIG. 7 in another embodiment when excited by the second feed source 50, with the horizontal axis being frequency (GHz) and the vertical axis being return loss (dB). Curve C is a return loss curve of the antenna assembly 100 corresponding to the LTE B1 frequency band in one embodiment. Curve D is a return loss curve of the antenna assembly 100 corresponding to the LTE B3 frequency band in one embodiment. Curve E is a return loss curve of the antenna assembly 100 corresponding to the LTE B20 frequency band in one embodiment. Curve F is a return loss curve of the antenna assembly 100 corresponding to the LTE B40 frequency band in one embodiment. Curve G is a return loss curve of the antenna assembly 100 corresponding to the LTE B41 frequency band in one embodiment. Curve C has C1 (2.0339, -14.595). Curve D has D1 (1.7837, -12.486). Curve E has E1 (0.81864, -12.295). Curve F has F1 (2.3557, -25.512). Curve G has G1 (2.5896, -20.407). It can be seen that the antenna performance of the antenna assembly 100 in the third frequency band (e.g., LTE B20 band) and the fourth frequency band (e.g., LTE B3 band, LTE B1 band, LTE B40 band, LTE B41 band) is good, and thus the working state is good, which can meet the engineering requirements.

Please refer to FIG. 14 , which is a system total efficiency curve of the antenna assembly 100 shown in FIG. 7 in another embodiment when excited by the second feed source 50. The horizontal axis is frequency (GHz), and the vertical axis is system total efficiency (dB). Curve c is a system total efficiency curve of the antenna assembly 100 corresponding to the LTE B1 frequency band in one embodiment. Curve d is a system total efficiency curve of the antenna assembly 100 corresponding to the LTE B3 frequency band in one embodiment. Curve e is a system total efficiency curve of the antenna assembly 100 corresponding to the LTE B20 frequency band in one embodiment. Curve f is a system total efficiency curve of the antenna assembly 100 corresponding to the LTE B40 frequency band in one embodiment. Curve g is a system total efficiency curve of the antenna assembly 100 corresponding to the LTE B41 frequency band in one embodiment. Curve c has c1 (2.0431, -4.6083). Curve d has d1 (1.8, -4.2537). Curve e has e1 (0.8244, -6.6274). The curve f has f1(2.3794, -4.3104). The curve g has g1(2.5982, -4.1249). It can be seen that the antenna assembly 100 has good antenna performance in the third frequency band (e.g., LTE B20 band) and the fourth frequency band (e.g., LTE B3 band, LTE B1 band, LTE B40 band, LTE B41 band), and thus has a good working condition and can meet engineering requirements.

Next, an electronic device is described, which can be equipped with the antenna assembly 100 in the above embodiment. The electronic device can be any one of a plurality of electronic devices, including but not limited to cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, calculators, programmable remote controls, pagers, netbook computers, personal digital assistants (PDAs), portable multimedia players (PMPs), moving picture experts group (MPEG-1 or MPEG-2), audio layer 3 (MP3) players, portable medical devices, digital cameras, and combinations thereof.

In some embodiments, the electronic device may include but is not limited to a mobile phone, a mobile internet device (MID), an e-book, a portable player station (Play Station Portable, PSP) or a personal digital assistant (Personal Digital Assistant, PDA) and other electronic devices with communication functions.

Please refer to Figure 15, which is an exploded view of an electronic device in an embodiment of the present application. The electronic device 200 may include a middle frame assembly 90 provided with an antenna assembly 100, a display screen 201 provided on one side of the middle frame assembly 90 and used to display information, a battery cover 202 connected to the other side of the middle frame assembly 90, a circuit board 203 installed on the middle frame assembly 90 and used to control the display screen 201 and the antenna assembly 100, and a battery 204 installed on the middle frame assembly 90 and used to power the electronic device 200 for normal operation.

Among them, the display screen 201 can be a liquid crystal display (Liquid Crystal Display, LCD) or an organic light-emitting diode display (Organic Light-Emitting Diode, OLED) and other types of display screens for displaying information and images.

The material of the middle frame assembly 90 can be a metal such as magnesium alloy, aluminum alloy, stainless steel, etc. Of course, the material is not limited thereto, and can also be other materials such as insulating materials, such as hard materials. The middle frame assembly 90 can be placed between the display screen 201 and the battery cover 202. The middle frame assembly 90 can be used to carry the display screen 201. The middle frame assembly 90 and the battery cover 202 are snap-fitted to form the main housing 80 of the electronic device 200, and a accommodating cavity is formed inside the main housing 80. The accommodating cavity can be used to accommodate electronic components such as the camera, the circuit main board 203, the battery 204, the processor (arranged on the circuit main board 203, so in some embodiments it can be part of the circuit main board 203), the antenna assembly 100, and various types of sensors in the electronic device 200.

The circuit board 203 is installed in the accommodating cavity and can be installed at any position in the accommodating cavity. The circuit board 203 can be the electronic device 200 The processor of the electronic device 200 may be arranged on the circuit main board 203. The circuit main board 203 may also be integrated with one, two or more functional components such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a camera, a distance sensor, an ambient light sensor, a gyroscope, etc. At the same time, the display screen 201 may be electrically connected to the circuit main board 203.

The battery 204 is installed in the accommodating cavity and can be installed at any position in the accommodating cavity. The battery 204 can be electrically connected to the circuit main board 203 so that the battery 204 can power the electronic device 200. A power management circuit can be provided on the circuit main board 203. The power management circuit is used to distribute the voltage provided by the battery 204 to various electronic components in the electronic device 200, such as the display screen 201.

The battery cover 202 can be made of the same material as the middle frame assembly 90, or other materials. The battery cover 202 can be integrally formed with the middle frame assembly 90. In some embodiments, the battery cover 202 can wrap the middle frame assembly 90 and can carry the display screen 201. The battery cover 202 can be formed with a rear camera hole, a fingerprint recognition module installation hole, and other structures.

It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

Please refer to FIG. 15 and FIG. 16, FIG. 16 is a schematic diagram of the structure of the frame assembly 90 in the embodiment shown in FIG. 15. The middle frame assembly 90 may include a substrate 91 for carrying the display screen 201 and a frame 92 surrounding the substrate 91. The substrate 91 is arranged opposite to the battery cover 202. The frame 92 can be used to snap-fit with the battery cover 202. That is, the substrate 91, the frame 92 and the battery cover 202 are surrounded to form a receiving cavity.

The substrate 91 may be a conductive metal, or other materials. A ground plane and a feed source may be provided on the substrate 91. The ground plane serves as a ground. In some embodiments, the ground plane and the feed source may not be provided on the substrate 91, but may be directly provided on the circuit main board 203. In some embodiments, the substrate 91 may be omitted.

The frame 92 may be a conductive metal, so the frame 92 may also be referred to as a "metal frame". Of course, the frame 92 may also be other materials, such as insulating materials. The frame 92 may also be made of the same material as the substrate 91. The frame 92 may include a first frame 921, a second frame 922, a third frame 923, and a fourth frame 924 connected end to end in sequence. The first frame 921, the second frame 922, the third frame 923, and the fourth frame 924 are arranged around the substrate 91 and may be connected and fixed to the substrate 91. In some embodiments, the frame 92 may be an integral structure with the battery cover 202. For example, the frame 92 extends from the edge of the battery cover 202 to one side of the display screen 201 so as to be snap-fitted and connected to the display screen 201.

In some embodiments, the first frame 921, the second frame 922, the third frame 923 and the fourth frame 924 are arranged to form a rounded rectangle. Of course, other shapes such as a circle, a triangle, etc. are also possible. In some embodiments, the first frame 921 and the third frame 923 are arranged opposite to each other, and the second frame 922 and the fourth frame 924 are arranged opposite to each other.

In some embodiments, the lengths of the first frame 921 and the third frame 923 are both shorter than the length of the second frame 922 , and shorter than the length of the fourth frame 92 .

It can be understood that the middle frame assembly 90 and the battery cover 202 can form the main housing 80. In some embodiments, the main housing is not limited to the middle frame assembly 90 and the battery cover 202, but can also include other components, which will not be described in detail.

Please refer to FIG. 16 . The antenna assembly 100 can be mounted on the middle frame assembly 90. In some embodiments, the antenna assembly 100 can be a part of the middle frame assembly 90. Of course, in some embodiments, the antenna assembly 100 can also be mounted on other locations of the main housing 80, such as the battery cover 202. In some embodiments, the antenna assembly 100 can be processed from the main housing 80. For example, the antenna assembly 100 appears as a slot antenna. In some embodiments, the antenna assembly 100 can be directly fixed to the main housing 80.

The radiator 10 is disposed on a frame 92 , such as a first frame 921 .

In one embodiment, the first feed source 20 and the second feed source 50 may be feed sources on the substrate 91 or the circuit main board 203. Specifically, the connection between the radiator 10 and the feed source may be achieved through an antenna spring.

In one embodiment, the ground may be a ground plane on the substrate 91 or the circuit main board 203. Specifically, the connection between the radiator 10 and the ground may be achieved through an antenna spring.

A gap 901 is provided between the first frame 921 and the substrate 91. The gap 901 can be extended toward the second frame 922 and the fourth frame 924 in the extension direction of the first frame 921 to be formed between the first frame 921 and the substrate 91, such as a ground plane, so that part or all of the first frame 921 serves as the radiator 10.

In some embodiments, the gap 901 may be extended toward the second frame 922 in the extension direction of the first frame 921 to form a gap between the second frame 922 and the substrate 91 , such as a ground plane.

In some embodiments, the gap 901 may be extended toward one side of the fourth frame 924 in the extension direction of the first frame 921 to be formed between the fourth frame 924 and the substrate 91 , such as a ground plane.

In the present application, the radiator 10 utilizes the first border 921 , which can effectively improve the performance loss of the antenna assembly 100 caused by human hands.

It can be understood that in order to stabilize the connection strength between the substrate 91 and the frame 92, such as the first frame 921, and the radiator 10, an insulating material such as resin can be filled between the gaps 901 to realize that the radiator 10 in the antenna assembly 100 is a part of the frame 92, such as the first frame 921, which further improves the appearance of the electronic device 200.

The present application adopts a solution of sharing a radiator, solves the isolation/coexistence problem, makes the overall system efficiency of the antenna assembly 100 good, reduces the design space requirement of the electronic device 200 by the antenna assembly 100, and has important engineering application benefits.

Next, an electronic device is described. Please refer to FIG. 17 . FIG. 17 is a schematic diagram of the structure of an electronic device 300 in an embodiment of the present application. The electronic device 300 can be a mobile phone, a tablet computer, a laptop computer, a wearable device, etc. The present embodiment is illustrated by taking a mobile phone as an example. The structure of the electronic device 300 may include an RF circuit 310 (such as the antenna assembly 100 in the above embodiment), a memory 320, an input unit 330, a display unit 340 (such as the display screen 201 in the above embodiment), a sensor 350, an audio circuit 360, a WiFi module 370, a processor 380, and a power supply 390 (such as the battery 204 in the above embodiment). Among them, the RF circuit 310, the memory 320, the input unit 330, the display unit 340, the sensor 350, the audio circuit 360, and the WiFi module 370 are respectively connected to the processor 380. The power supply 390 is used to provide electrical energy for the entire electronic device 300.

Specifically, the RF circuit 310 is used to receive and send signals. The memory 320 is used to store data instruction information. The input unit 330 is used to input information, and may specifically include a touch panel 3301 and other input devices 3302 such as operation buttons. The display unit 340 may include a display panel 3401, etc. The sensor 350 includes an infrared sensor, a laser sensor, a position sensor, etc., for detecting user approach signals, distance signals, etc. The speaker 3601 and the microphone (or microphone, or receiver component) 3602 are connected to the processor 380 through the audio circuit 360 for receiving and sending sound signals. The WiFi module 370 is used to receive and transmit WiFi signals. The processor 380 is used to process data information of the electronic device.

In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device implementation described above is only illustrative, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

An antenna assembly, comprising:

A radiator, comprising a first free end, a second free end, a first feeding point and a first grounding point, wherein the first grounding point is located between the first free end and the second free end, and the first feeding point is located between the first free end and the first grounding point;

A first feed source, used to excite the radiator to support a first frequency band and a second frequency band;

A first frequency selection circuit is electrically connected between the first feeding point and the first feed source, so that the first feed source is electrically connected to the first feeding point through the first frequency selection circuit, the first frequency selection circuit is grounded, and the current supporting the first frequency band is configured to flow from the ground through the first frequency selection circuit to input into the radiator; and

A tuning circuit is electrically connected between the first grounding point and the ground, so that the first grounding point is grounded through the tuning circuit, and the current supporting the second frequency band is configured to flow from the ground through the tuning circuit to input into the radiator.
The antenna assembly according to claim 1, wherein the first frequency selection circuit comprises:

A first matching circuit is electrically connected between the first feeding point and the first feed source so that the first feed source is electrically connected to the first feeding point through the first matching circuit. The first matching circuit is grounded, and the current supporting the first frequency band is configured to flow from the ground through the first matching circuit to be input into the radiator.
The antenna assembly according to claim 2, wherein the first matching circuit comprises:

a first capacitor, electrically connected between the first feeding point and the first feed source, so that the first feed source is electrically connected to the first feeding point through the first capacitor,

The second capacitor is electrically connected between the first capacitor and the ground, so that the first capacitor is grounded through the second capacitor, and the current supporting the first frequency band is configured to flow from the ground through the second capacitor and the first capacitor to input into the radiator.
The antenna assembly according to claim 3, wherein the capacitance of the second capacitor is 1 pF.
The antenna assembly of claim 1, wherein the tuning circuit comprises:

The third capacitor is electrically connected between the first grounding point and the ground, so that the first grounding point is grounded through the third capacitor, and the current supporting the second frequency band is configured to flow from the ground through the third capacitor to input into the radiator.
The antenna assembly according to claim 5, wherein the capacitance of the third capacitor is 2.7 pF.
The antenna assembly according to any one of claims 1-6, wherein the first feed source is configured to excite the radiating portion on the radiator located between the first feed point and the first free end to generate a first resonant mode supporting the first frequency band, the first resonant mode is a 1/4 wavelength inverted F antenna IFA antenna mode, and the current supporting the first frequency band is configured to flow from the first feed point to the first free end.
The antenna assembly according to claim 7, wherein the first frequency band comprises a Wireless Fidelity WiFi 5G frequency band.
The antenna assembly according to any one of claims 1-6, wherein the first feed source is configured to excite the radiating portion of the radiator located between the first grounding point and the first free end to generate a second resonant mode supporting the second frequency band, the second resonant mode is a 1/4 wavelength left-handed antenna mode, and the current supporting the second frequency band is configured to flow from the first grounding point to the first free end.
The antenna assembly according to claim 9, wherein the second frequency band comprises a new radio N78 frequency band.
The antenna assembly according to claim 1, wherein the radiator further has a second feeding point located between the first ground point and the second free end, and the antenna assembly further comprises:

A second feed source, used to excite the radiator;

a second frequency selection circuit, electrically connected between the second feed point and the second feed source, so that the second feed source is electrically connected to the second feed point through the second frequency selection circuit, the second frequency selection circuit is grounded, the first frequency selection circuit is configured to be in a high impedance state when the second feed source excites the radiator, and to be in a low impedance state when the first feed source excites the radiator, and the second frequency selection circuit is configured to be in a high impedance state when the first feed source excites the radiator, and to be in a low impedance state when the second feed source excites the radiator.
The antenna assembly according to claim 11, wherein the first frequency selection circuit is configured to be disconnected when the second feed source excites the radiator and to be connected when the first feed source excites the radiator, and the second frequency selection circuit is configured to be disconnected when the first feed source excites the radiator and to be connected when the second feed source excites the radiator.
The antenna assembly according to any one of claims 11-12, wherein the first frequency selection circuit comprises:

A first matching circuit, connected to the first feed source and grounded;

A first filter circuit is electrically connected between the first feeding point and the first matching circuit, so that the first matching circuit is electrically connected to the first feeding point through the first filter circuit, and the current supporting the first frequency band is configured to flow from the ground through the first matching circuit and the first filter circuit to input into the radiator, and the first filter circuit is configured to be disconnected when the second feed source excites the radiator, and to be connected when the first feed source excites the radiator.
The antenna assembly according to claim 13, wherein the first filtering circuit comprises:

a fourth capacitor, electrically connected between the first feeding point and the first matching circuit, so that the first matching circuit is electrically connected to the first feeding point through the fourth capacitor, and the current supporting the first frequency band is configured to flow through the fourth capacitor;

A first inductor is electrically connected between the first feeding point and the first matching circuit so that the first matching circuit The inductor is electrically connected to the first feeding point.
The antenna assembly according to any one of claims 11-12, wherein the second frequency selection circuit has a first electrical connection end electrically connected to the second feeding point and a second electrical connection end electrically connected to the second feed source, the first electrical connection end is electrically connected to the second electrical connection end, and the second frequency selection circuit comprises:

a second matching circuit, electrically connected between the first electrical connection end and the ground, so that the first electrical connection end is grounded through the second matching circuit;

A second filtering circuit is electrically connected between the first electrical connection end and the ground so that the first electrical connection end is grounded through the second filtering circuit; the second filtering circuit is configured to control the second frequency selection circuit to be disconnected when the first feed source excites the radiator, and to be connected when the second feed source excites the radiator.
The antenna assembly according to any one of claims 11-12, wherein the radiator also has a second grounding point located between the first grounding point and the second feeding point, the second grounding point is grounded, and the second feed source is configured to excite the radiating portion of the radiator located between the second grounding point and the first free end to generate a third resonant mode supporting a third frequency band, the third resonant mode is an IFA antenna mode, and the current of the third resonant mode is configured to flow from the second grounding point to the first free end.
The antenna assembly according to claim 16, wherein the third frequency band includes a Long Term Evolution LTE B20 band.
The antenna assembly according to any one of claims 11-12, wherein the radiator also has a second grounding point located between the first grounding point and the second feeding point, the second grounding point is grounded, and the second feed source is configured to excite the radiating portion of the radiator located between the second grounding point and the second free end to generate a fourth resonant mode supporting a fourth frequency band, the fourth resonant mode is an IFA antenna mode, and the current of the fourth resonant mode is configured to be a current flowing from the second grounding point to the second free end.
The antenna assembly according to claim 18, wherein the fourth frequency band includes at least one of an LTE B1 band, an LTE B3 band, an LTE B39 band, an LTE B40 band or an LTE B41 band.
The antenna assembly according to claim 18, wherein the radiator further has a third ground point located between the second feed point and the second free end, and the antenna assembly further comprises:

A switching circuit is electrically connected between the third grounding point and the ground, so that the third grounding point is grounded through the switching circuit, and the switching circuit is used to adjust the frequency of the fourth frequency band.
The antenna assembly of claim 20, wherein the switching circuit comprises:

a switching switch having a plurality of connection terminals, a switching portion, and a common terminal electrically connected to the third grounding point, wherein the switching portion is electrically connected to the common terminal and is configured to be electrically connected to one of the plurality of connection terminals under the control of a control signal; and

At least one frequency selection branch, one end of the at least one frequency selection branch is electrically connected to a connection end of the plurality of connection ends in a one-to-one correspondence, and the other end is grounded.
The antenna assembly according to claim 21, wherein each of the at least one frequency-selective branches comprises a capacitor or an inductor.
An antenna assembly, comprising:

A radiator, comprising a first free end, a second free end, a first feeding point, a second feeding point, a first grounding point, a second grounding point and a third grounding point, wherein the first grounding point is located between the first free end and the second free end, the first feeding point is located between the first free end and the first grounding point, the second feeding point is located between the first grounding point and the second free end, the second grounding point is located between the first grounding point and the second feeding point, and the third grounding point is located between the second feeding point and the second free end;

a first feed source, used for exciting a radiating portion of the radiator between the first feeding point and the first free end to generate a first resonance mode, and used for exciting a radiating portion of the radiator between the first grounding point and the first free end to generate a second resonance mode;

a first frequency selection circuit, electrically connected between the first feeding point and the first feed source, so that the first feed source is electrically connected to the first feeding point through the first frequency selection circuit, the first frequency selection circuit is grounded, and the current of the first resonant mode is configured to flow from the ground through the first frequency selection circuit and the first feeding point to the first free end;

a tuning circuit electrically connected between the first grounding point and ground, so that the first grounding point is grounded through the tuning circuit, and a current of the second resonant mode is configured to flow from ground through the tuning circuit and the first grounding point to the first free end;

a second feed source, used for exciting a radiating portion of the radiator between the second grounding point and the first free end to generate a third resonance mode, and used for exciting a radiating portion of the radiator between the second grounding point and the second free end to generate a fourth resonance mode;

a second frequency selection circuit, electrically connected between the second feed point and the second feed source, so that the second feed source is electrically connected to the second feed point through the second frequency selection circuit, the second frequency selection circuit is grounded, the first frequency selection circuit is configured to be disconnected when the second feed source excites the radiator, and to be connected when the first feed source excites the radiator, and the second frequency selection circuit is configured to be disconnected when the first feed source excites the radiator, and to be connected when the second feed source excites the radiator; and

A switching circuit is electrically connected between the third grounding point and the ground, so that the third grounding point is grounded through the switching circuit, and the switching circuit is used to adjust the frequency of the frequency band supported by the fourth resonance mode.
A middle frame assembly, comprising:

A substrate is provided with a ground plane;

A frame is arranged around the substrate; and

According to the antenna assembly as described in any one of claims 1-23, the radiator is arranged on the frame and a gap is provided between the radiator and the ground plane.
An electronic device, comprising:

Middle frame assembly, including:

Substrate;

a frame connected to the substrate, comprising a first frame, a second frame, a third frame and a fourth frame which are sequentially connected end to end and are arranged around the substrate, the first frame is arranged opposite to the third frame, the second frame is arranged opposite to the fourth frame, and the lengths of the first frame and the third frame are both shorter than the length of the second frame and shorter than the length of the fourth frame;

The antenna assembly according to any one of claims 1 to 23, wherein the radiator is arranged on the first frame;

a battery cover, which is disposed on one side of the middle frame assembly and is respectively connected to the first frame, the second frame, the third frame and the fourth frame, and is disposed opposite to the substrate; and

The display screen is arranged on the other side of the middle frame assembly, and is respectively connected to the first frame, the second frame, the third frame and the fourth frame, and is arranged opposite to the substrate.