CN117791100A

CN117791100A - Antenna assembly and electronic equipment

Info

Publication number: CN117791100A
Application number: CN202410133274.1A
Authority: CN
Inventors: 闫星岩; 陈乾龙
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2024-01-30
Filing date: 2024-01-30
Publication date: 2024-03-29

Abstract

The application provides an antenna assembly and electronic equipment. The antenna assembly comprises a first feed source, a second feed source, an antenna radiator and a filtering unit. The antenna radiator comprises a first free end, a first feed point, a first grounding point, a second feed point and a second free end which are sequentially arranged at intervals. The filtering unit comprises a first filtering circuit or a second filtering circuit, one end of the first filtering circuit is electrically connected with the second grounding point, and the other end of the first filtering circuit is grounded and used for filtering signals of a first frequency band and signals of a second frequency band. One end of the second filter circuit is electrically connected with the first grounding point, and the other end of the second filter circuit is grounded and is used for passing signals of the second frequency band and filtering signals of the first frequency band. The first resonance mode is used for generating a first frequency band between the second grounding point and the first free end, and the second resonance mode is used for generating a second frequency band between the first grounding point and the second free end. The antenna assembly and the electronic equipment provided by the application have better isolation and efficiency.

Description

Antenna assembly and electronic equipment

Technical Field

The application relates to the technical field of electronics, in particular to an antenna assembly and electronic equipment.

Background

As electronic devices develop, the number of antennas that need to be provided increases. In the related art, it is difficult for an antenna of an electronic device to achieve both isolation and efficiency.

Disclosure of Invention

The application provides an antenna assembly and electronic equipment capable of considering isolation and efficiency.

In one aspect, the present application provides an antenna assembly comprising:

a first feed;

a second feed;

the antenna radiator comprises a first free end, a first feed point, a first grounding point, a second feed point and a second free end which are sequentially arranged at intervals, wherein the first feed point is electrically connected with the first feed source, and the second feed point is electrically connected with the second feed source; and

The filtering unit comprises a first filtering circuit and a first grounding piece, wherein one end of the first filtering circuit is electrically connected with the second grounding point, the other end of the first filtering circuit is grounded and used for filtering signals of a first frequency band and signals of a second frequency band, and one end of the first grounding piece is electrically connected with the first grounding point; or the filtering unit comprises a second filtering circuit and a second grounding piece, wherein one end of the second filtering circuit is electrically connected with the first grounding point, the other end of the second filtering circuit is grounded and is used for filtering signals of the first frequency band through signals of the second frequency band, one end of the second grounding piece is electrically connected with the second grounding point, and the other end of the second grounding piece is grounded;

The antenna radiator between the second grounding point and the first free end generates a first resonance mode supporting the first frequency band under the excitation of the first feed source, and the antenna radiator between the first grounding point and the second free end generates a second resonance mode supporting the second frequency band under the excitation of the second feed source.

On the other hand, the application also provides electronic equipment, including the frame with antenna module, the frame includes adjacent top frame and lateral part frame, first ground point with between the first free end the antenna radiator is located the top frame, the second ground point with between the second free end the antenna radiator is located the lateral part frame.

The antenna assembly comprises a first feed source, a second feed source, an antenna radiator and a filtering unit, wherein the antenna radiator comprises a first free end, a first feed point, a first grounding point, a second feed point and a second free end which are sequentially arranged at intervals; one end of the second filter circuit is electrically connected with the first grounding point, the other end of the second filter circuit is grounded and is used for passing signals of the second frequency band and filtering signals of the first frequency band, one end of the second grounding piece is electrically connected with the second grounding point, the other end of the second filter circuit is grounded, the antenna radiator between the second grounding point and the first free end generates a first resonance mode supporting the first frequency band under the excitation of the first feed source, and the antenna radiator between the first grounding point and the second free end generates a second resonance mode supporting the second frequency band under the excitation of the second feed source, so that ground return paths which are not identical or different in the first resonance mode and the second resonance mode are designed, and the antenna radiator between the first resonance mode and the second resonance mode are multiplexed with the first grounding point and the second grounding point can ensure the effective electrical length of the antenna radiator under the first resonance mode and the second resonance mode, and further the isolation degree of the antenna assembly can be increased, and the efficiency of the antenna assembly can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below.

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

FIG. 2 is a schematic diagram of the electronic device of FIG. 1 including an antenna assembly and a reference floor;

fig. 3 is a schematic circuit diagram of an antenna assembly according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of another circuit structure of an antenna assembly according to an embodiment of the present disclosure;

fig. 5 is a schematic circuit diagram of another antenna assembly according to an embodiment of the present disclosure;

fig. 6 is a schematic circuit diagram of the antenna assembly shown in fig. 3 further including a first tuning circuit;

fig. 7 is a schematic circuit diagram of a first tuning circuit in the antenna assembly shown in fig. 6;

fig. 8 is a schematic circuit diagram of the antenna assembly shown in fig. 6 further including a second tuning circuit;

fig. 9 is a schematic circuit diagram of the antenna assembly of fig. 8 for generating a first resonant mode;

fig. 10 is a schematic circuit diagram of the antenna assembly of fig. 8 for generating a second resonant mode;

fig. 11 is a schematic circuit diagram of the antenna assembly shown in fig. 4 for generating a first resonant mode;

Fig. 12 is a schematic circuit diagram of the antenna assembly of fig. 4 for generating a second resonant mode;

fig. 13 is a schematic circuit diagram of the antenna assembly of fig. 5 for generating a first resonant mode;

fig. 14 is a schematic circuit diagram of the antenna assembly of fig. 5 for generating a second resonant mode;

fig. 15 is a schematic view of a portion of the length of an antenna radiator in the antenna assembly of fig. 8;

fig. 16 is a schematic view of another portion of the length of the antenna radiator in the antenna assembly of fig. 8;

fig. 17 is a schematic circuit diagram of a first tuning circuit of an antenna radiator in the antenna assembly shown in fig. 8, including a first inductor and a first capacitor connected in series;

fig. 18 is a schematic circuit diagram of a second tuning circuit of the antenna radiator in the antenna assembly shown in fig. 8, including a second inductor and a second capacitor connected in series;

FIG. 19 is a schematic view of the antenna assembly of FIG. 8 disposed on a frame;

fig. 20 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application with a second grounding point of an antenna radiator and a filtering unit removed;

fig. 21 is a return loss curve and isolation curve for the antenna assembly of fig. 20;

fig. 22 is a graph of efficiency of the antenna assembly of fig. 20;

fig. 23 is a schematic structural diagram of an antenna assembly according to an embodiment of the present application with a filtering unit removed;

Fig. 24 is a return loss curve and isolation curve for the antenna assembly of fig. 23;

fig. 25 is a graph of efficiency of the antenna assembly of fig. 23;

fig. 26 is a return loss curve and isolation curve of an antenna assembly provided in an embodiment of the present application;

fig. 27 is an efficiency graph of an antenna assembly provided in an embodiment of the present application;

FIG. 28 is a graph comparing isolation curves of three antenna assemblies;

FIG. 29 is a graph comparing efficiency curves of three antenna assemblies in the GPS L1 band;

fig. 30 is a graph comparing efficiency curves of three antenna elements in a low frequency band.

Reference numerals illustrate:

an electronic device 1000; a frame 2; an antenna assembly 100; a top rim 21; a first side frame 22; a bottom rim 23; a second side frame 24; a reference floor 3; a first feed 10; a second feed 20; an antenna radiator 30; a filtering unit 40; a first free end a; a first feeding point B; a first ground point C; a second ground point D; a second feeding point E; a second free end F; a first filter circuit 401; a second filter circuit 402; a first ground 403; a second ground 404; a first tuning circuit 50; a first inductance 410; a first capacitor 411; a second inductance 420; a second capacitor 421; target corner point G.

Detailed Description

The technical solutions provided in the present application will be clearly and completely described below with reference to the accompanying drawings. It is apparent that the embodiments described herein are only some embodiments, not all embodiments. All other embodiments, which can be made by a person of ordinary skill in the art without any inventive effort, based on the embodiments described herein, are intended to be within the scope of the present application.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase 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 skilled in the art will appreciate explicitly and implicitly that the embodiments described herein may be combined with other embodiments.

The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. The terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the foregoing drawings are intended to cover non-exclusive inclusions, such as: an assembly or device incorporating one or more components is not limited to the listed one or more components, but may alternatively include one or more components not listed but inherent to the illustrated product, or one or more components that may be provided based on the illustrated functionality. Furthermore, the terms "end" and "point" in the description and claims of the present application and in the description of the above figures may refer to a small section of the antenna radiator relative to the antenna radiator as a whole, i.e. "end" cannot be interpreted as a narrow sense as an end, and "point" cannot be interpreted as a narrow sense as a point.

As shown in fig. 1, fig. 1 is a schematic structural diagram of an electronic device 1000 according to an embodiment of the present application. The electronic device 1000 may be a device having a wireless communication function such as a mobile phone, a tablet computer, a notebook computer, a wristwatch, a drone, a robot, or the like. The embodiment of the application takes a mobile phone as an example, and can be a straight screen mobile phone, a folding mobile phone, a slide roll mobile phone and the like. The electronic device 1000 comprises a bezel 2 and an antenna assembly 100. Of course, the electronic device 1000 may also include a circuit board, a display screen, a battery, a camera module, and so on.

The frame 2 may be a metal frame or a non-metal frame. For example: the material of the frame 2 can be one of aluminum alloy, titanium alloy, stainless steel, plastic, glass and the like. The shape of the rim 2 includes, but is not limited to, one of a substantially rectangular shape, a square shape, a circular shape, an elliptical shape, and the like. In the following embodiments, the shape of the frame 2 is substantially rectangular.

The rim 2 comprises adjacent top and side rims 21, respectively. In one possible embodiment, the frame 2 includes a top frame 21, a first side frame 22, a bottom frame 23, and a second side frame 24 connected end to end in sequence. The top frame 21 may be understood as a portion of the frame that is located on a side relatively far from the user when the electronic device 1000 is used by the user when the user is standing; the first side frame 22 may be understood as a portion of the frame that is positioned to the right of the user when the electronic device 1000 is used by the user when the user is in portrait orientation; the bottom bezel 23 may be understood as a portion of the bezel that is located relatively close to the user's side when the electronic device 1000 is in use by a user with the portrait screen; the second side frame 24 may be understood as a portion of the frame that is to the left of the user when the user is using the electronic device 1000 with the portrait screen. In the following embodiments, the first side frame 22 is taken as an example of the side frame unless explicitly stated.

Referring to fig. 1 and 2, fig. 2 is a schematic structural diagram of the electronic device 1000 shown in fig. 1 including an antenna assembly 100 and a reference floor 3. The electronic device 1000 has a reference floor 3. The reference floor 3 refers to a portion of the electronic device 1000 that is not affected by any grounding configuration, and is considered to be a conductive ground. The potential convention of the reference floor 3 is zero. For example: the reference floor 3 may include a ground layer of a main board, a ground layer of a sub-board, a metal piece of a middle frame, a conductive piece electrically connecting one or more of the ground layer of the main board, the ground layer of the sub-board, the metal piece of the middle frame, and the like in the electronic device 1000. The structure of the reference floor 3 shown in fig. 2 of the present application is only an illustration, and is not intended to limit the shape of the reference floor 3 to a regular rectangle.

Referring to fig. 1 to 3, fig. 3 is a schematic circuit diagram of an antenna assembly 100 according to an embodiment of the present disclosure. The antenna assembly 100 includes a first feed 10, a second feed 20, an antenna radiator 30, and a filter unit 40.

The first feed 10 may be understood as a port provided on the circuit board of the electronic device 1000 and relatively close to the antenna radiator 30. The first feed 10 is electrically connected to a radio frequency chip on a circuit board of the electronic device 1000, and is configured to receive radio frequency current emitted by the radio frequency chip, so as to excite the antenna radiator 30 to generate a corresponding resonant current. The second feed 20 may be understood as another port provided on the circuit board of the electronic device 1000 and relatively close to the antenna radiator 30, and the second feed 20 is electrically connected to the radio frequency chip on the circuit board of the electronic device 1000, for receiving radio frequency current emitted by the radio frequency chip, so as to excite the antenna radiator 30 to generate a corresponding resonant current. In this embodiment, the first feed 10 excites the antenna radiator 30 to generate a resonant current capable of communicating in the first frequency band. The second feed 20 excites the antenna radiator 30 to produce a resonant current capable of second frequency band communication. Wherein the first frequency band is different from the second frequency band.

The antenna radiator 30 is a conductor having a specific size. The material of the antenna radiator 30 includes, but is not limited to, metal, alloy, carbon fiber, etc. The shape of the antenna radiator 30 includes, but is not limited to, a strip, a sheet, a bar, a coating, a film, and the like. In the embodiment of the present application, the antenna radiator 30 is substantially in the shape of a strip. The antenna radiator 30 may be extended in a linear, curved, bent, etc. manner. The width of the antenna radiator 30 may be uniform, or gradual, or abrupt. The antenna radiator 30 may be an internal antenna or an external antenna. When the antenna radiator 30 is a built-in antenna, the forms of the antenna radiator 30 include, but are 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 (e.g., a metal bracket antenna), and the like. When the antenna radiator 30 is an external antenna, the antenna radiator 30 may include, but is not limited to, a metal frame antenna, an FPC antenna provided on an outer surface of a non-conductive frame, an LDS antenna, a PDS antenna, or the like.

The antenna radiator 30 includes a first free end a, a first feeding point B, a first grounding point C, a second grounding point D, a second feeding point E, and a second free end F, which are sequentially disposed at intervals. The term "free end" is understood to mean the end of the antenna radiator 30 which is not electrically connected to the conductive element or which is provided with a break between the conductive element and the conductive element. The "feed point" may be understood as the end, or port, or location of the antenna radiator 30 electrically connected to the corresponding feed. The ground point may be understood as the end, or port, or location of the antenna radiator 30 electrically connected to the reference floor 3. The spacing distance between the first free end a, the first feeding point B, the first grounding point C, the second grounding point D, the second feeding point E, and the second free end F is not particularly limited, and can be specifically designed according to the operation requirement of the antenna radiator 30. In one possible embodiment, the separation distance between the first free end a and the first feeding point B may be smaller than the separation distance between the first feeding point B and the first ground point C; the separation distance between the second ground point D and the second feeding point E may be greater than the separation distance between the second feeding point E and the second free end F. The first free end a, the first feeding point B, the first grounding point C, the second grounding point D, the second feeding point E and the second free end F may be sequentially arranged along a clockwise direction or a counterclockwise direction; alternatively, the first free end a, the first feeding point B, the first grounding point C, the second grounding point D, the second feeding point E, and the second free end F may be sequentially arranged along a linear or curved extending direction.

In one possible embodiment, the antenna radiator 30 between the first ground point C and the first free end a is provided on the top rim 21, and the antenna radiator 30 between the second ground point D and the second free end F is provided on the side rim. In another possible embodiment, the antenna radiator 30 between the first ground point C and the first free end a may be provided at the side frame, and the antenna radiator 30 between the second ground point D and the second free end F may be provided at the top frame 21. Of course, in other possible embodiments, the antenna radiator 30 between the first free end a and the second free end F may be disposed on the top frame 21, or the antenna radiator 30 between the first free end a and the second free end F may be disposed on the first side frame 22, or the antenna radiator 30 between the first free end a and the second free end F may be disposed on the second side frame 24, or the antenna radiator 30 between the first free end a and the second free end F may be disposed on the bottom frame 23. The description of the antenna radiator 30 provided on the frame 2 in this embodiment may refer to that the antenna radiator 30 is provided on the inner surface of the frame 2, or may refer to that the antenna radiator 30 is integrated on the frame 2, or may refer to that the antenna radiator 30 is provided on the outer surface of the frame 2.

The first feed point B is electrically connected to the first feed 10. The first feed point B may be directly or indirectly electrically connected to the first feed source 10. For example: the first feeding point B and the first feed source 10 may be directly welded, or electrically connected through electrical connectors such as coaxial lines, microstrip lines, conductive spring plates, conductive adhesives, circuit boards, etc.

The second feed point E is electrically connected to the second feed 20. The second feed point E may be directly or indirectly electrically connected to the second feed source 20. For example: the second feeding point E and the second feed source 20 may be directly welded, or electrically connected through electrical connectors such as coaxial lines, microstrip lines, conductive spring plates, conductive adhesives, circuit boards, etc.

Referring to fig. 3 and 4, the filtering unit 40 includes a first filtering circuit 401 and a first grounding element 403, or the filtering unit 40 includes a second filtering circuit 402 and a second grounding element 404.

As shown in fig. 3, one end of the first filter circuit 401 is electrically connected to the second ground point D, and the other end is grounded, for passing the signal of the first frequency band and filtering the signal of the second frequency band. In other words, the first filter circuit 401 is electrically connected between the second ground point D and the reference floor 3. The first filter circuit 401 allows signals of the first frequency band to be grounded via the second ground point D and blocks signals of the second frequency band from being grounded via the second ground point D. It will be appreciated that the first filter circuit 401 is in a low impedance state for signals in the first frequency band and in a high impedance state for signals in the second frequency band. Wherein the first frequency band is different from the second frequency band. One end of the first grounding member 403 is electrically connected to the first grounding point C, and the other end is grounded. The term "grounded" as described in this application is understood to mean electrically connected to the reference floor 3. The first ground 403 is electrically connected between the reference floor 3 and the first ground point C. The first grounding element 403 may be an electrical connection element such as a conductive wire, a conductive spring, a conductive adhesive, a circuit board, etc.

As shown in fig. 4, one end of the second filter circuit 402 is electrically connected to the first ground point C, and the other end is grounded, for passing the signal in the second frequency band and filtering the signal in the first frequency band. In other words, the second filter circuit 402 is electrically connected between the first ground point C and the reference floor 3. The second filter circuit 402 allows signals of the second frequency band to be grounded via the first ground point C and blocks signals of the first frequency band from being grounded via the first ground point C. It will be appreciated that the second filter circuit 402 is in a low impedance state for signals in the second frequency band and in a high impedance state for signals in the first frequency band. One end of the second grounding member 404 is electrically connected to the second grounding point D, and the other end is grounded. It will be appreciated that the second ground 404 is electrically connected between the reference floor 3 and the second ground point D. The second grounding member 404 may be an electrical connection member such as a conductive wire, a conductive spring, a conductive paste, a circuit board, etc.

When the filter unit 40 is configured to include the first filter circuit 401 and the first ground 403, the second ground point D is grounded through the first filter circuit 401, and the first ground point C is grounded through the first ground 403. When the filter unit 40 is configured to include the second filter circuit 402 and the second grounding part 404, the first grounding point C is grounded through the second filter circuit 402, and the second grounding point D is grounded through the second grounding part 404. Of course, in other embodiments, as shown in fig. 5, the filtering unit 40 may also be configured to include both the first filtering circuit 401 and the second filtering circuit 402, where the first grounding point C is grounded through the second filtering circuit 402 and the second grounding point D is grounded through the first filtering circuit 401.

Wherein the antenna radiator 30 between the second ground point D and the first free end a generates a first resonant mode supporting the first frequency band under the excitation of the first feed. The antenna radiator 30 between the first ground point C and the second free end F generates a second resonant mode supporting the second frequency band under excitation of the second feed.

In one possible embodiment, when the filtering unit 40 is configured to include the first filtering circuit 401 and the first ground member 403, the antenna radiator 30 between the first ground point C and the first free end a generates a first sub-resonance mode under the excitation of the first feed source, and the antenna radiator 30 between the second ground point D and the first free end a generates a second sub-resonance mode under the excitation of the first feed source, and the first sub-resonance mode and the second sub-resonance mode form a first resonance mode. The antenna radiator 30 between the first ground point C and the second free end F generates a second resonant mode upon excitation by the second feed.

In another possible embodiment, when the filtering unit 40 is configured to include the second filtering circuit 402 and the second ground 404, the antenna radiator 30 between the second ground point D and the first free end a generates a first resonant mode under the excitation of the first feed. The antenna radiator 30 between the second ground point D and the second free end F generates a third sub-resonance mode under the excitation of the second feed, the antenna radiator 30 between the first ground point C and the second free end F generates a fourth sub-resonance mode under the excitation of the second feed, and the third sub-resonance mode and the fourth sub-resonance mode form a first resonance mode.

In a third possible embodiment, when the filter unit 40 is configured to include both the first filter circuit 401 and the second filter circuit 402, the antenna radiator 30 between the second ground point D and the first free end a generates a first resonant mode under excitation of the first feed. The antenna radiator 30 between the first ground point C and the second free end F generates a second resonant mode upon excitation by the second feed.

The antenna assembly 100 provided by the application comprises a first feed source 10, a second feed source 20, an antenna radiator 30 and a filtering unit 40, wherein the antenna radiator 30 comprises a first free end A, a first feed point B, a first grounding point C, a second grounding point D, a second feed point E and a second free end F which are sequentially arranged at intervals, the first feed point B is electrically connected with the first feed source 10, the first grounding point C is grounded, the second grounding point D is grounded, the second feed point E is electrically connected with the second feed source 20, the filtering unit 40 comprises a first filtering circuit 401 and/or a second filtering circuit 402, one end of the first filtering circuit 401 is electrically connected with the second grounding point D, the other end of the first filtering circuit 401 is grounded and is used for filtering signals of a second frequency band through signals of a first frequency band, one end of the second filtering circuit 402 is electrically connected with the first grounding point C, and the other end of the second filtering circuit 402 is grounded, the antenna radiator 30 between the second grounding point D and the first free end a generates a first resonant mode supporting the first frequency band under the excitation of the first feed source, and the antenna radiator 30 between the first grounding point C and the second free end F generates a second resonant mode supporting the second frequency band under the excitation of the second feed source, so that a ground return path with the first resonant mode and the second resonant mode being not identical or different is designed, and the antenna radiator 30 between the first grounding point C and the second grounding point D is multiplexed by the first resonant mode and the second resonant mode, so that the effective electrical length of the antenna radiator 30 under the first resonant mode and the second resonant mode can be ensured, and the isolation degree of the antenna assembly 100 can be increased, and the efficiency of the antenna assembly 100 can be improved.

In one possible embodiment, as shown in fig. 6, the antenna assembly 100 further includes a first tuning circuit 50. Alternatively, as shown in fig. 7 a, the first tuning circuit 50 may comprise a capacitor and an inductor in series. As shown in fig. 7 b, the first tuning circuit 50 may also comprise a capacitor and an inductor in parallel. As shown in fig. 7 c, the first tuning circuit 50 may also include an inductor, a first capacitor and a second capacitor, where the inductor is connected in parallel with the first capacitor and then connected in series with the second capacitor. As shown in fig. 7 d, the first tuning circuit 50 may also include a first inductor, a second inductor, and a capacitor, where the first inductor is connected in parallel with the capacitor and then connected in series with the second inductor. As shown in fig. 7 e, the first tuning circuit 50 may also include an inductor, a first capacitor and a second capacitor, where the inductor is connected in series with the first capacitor and then connected in parallel with the second capacitor. As shown in fig. 7 f, the first tuning circuit 50 may also include a first inductor, a second inductor, and a capacitor, where the first inductor is connected in series with the capacitor and then connected in parallel with the second inductor. As shown in fig. 7 g, the first tuning circuit 50 may also include a first sub-tuning circuit formed by connecting a first inductor and a first capacitor in parallel, and a second sub-tuning circuit formed by connecting a second inductor and a second capacitor in parallel, where the first sub-tuning circuit is connected in series with the second sub-tuning circuit. As shown in fig. 7 h, the first tuning circuit 50 may also include a third sub-tuning circuit formed by connecting a first inductor and a first capacitor in series, and a fourth sub-tuning circuit formed by connecting a second inductor and a second capacitor in series, where the third sub-tuning circuit is connected in parallel with the fourth sub-tuning circuit. Of course, in other embodiments, the first tuning circuit 50 may include a capacitance but not an inductance.

The first tuning circuit 50 is capacitive. In other words, the first tuning circuit 50 comprises at least one capacitor. When the first tuning circuit 50 includes a capacitor and an inductor, the first tuning circuit 50 is capacitive to the signal of the first frequency band. Taking the first tuning circuit 50 as an example, the tuning circuit shown in a diagram in fig. 7, the first tuning circuit 50 and the first frequency band satisfy the relation:wherein f ₁ Is the center frequency of the first frequency band; l (L) ₁ An inductance value of the first tuning circuit 50; c (C) ₁ Is the capacitance value of the first tuning circuit 50.

The first tuning circuit 50 is electrically connected between the first feed point B and the first feed source 10, and one end of the first tuning circuit 50 is grounded. It will be appreciated that one end of the first tuning circuit 50 is electrically connected to the first feed point B, the other end of the first tuning circuit 50 is electrically connected to the first feed source 10, and the other end of the first tuning circuit 50 is grounded. The first tuning circuit 50 may be directly electrically connected to the first feeding point B or indirectly electrically connected to the first feeding point B. For example: the first tuning circuit 50 and the first feeding point B may be directly soldered, or electrically connected by electrical connectors such as coaxial lines, microstrip lines, conductive clips, conductive adhesives, circuit boards, etc. The first tuning circuit 50 may be directly electrically connected to the first feed 10 or indirectly electrically connected to the first feed. For example: the first tuning circuit 50 and the first feed source 10 may be directly welded, or electrically connected through electrical connectors such as coaxial lines, microstrip lines, conductive spring plates, conductive adhesives, circuit boards, and the like. The first tuning circuit 50 may be directly or indirectly electrically connected to the reference floor 3. For example: the first tuning circuit 50 and the reference floor 3 may be directly soldered, or electrically connected by electrical connectors such as coaxial lines, microstrip lines, conductive clips, conductive adhesives, circuit boards, etc.

The first resonant mode includes a Composite Right/Left Handed (CRLH) mode supporting the first frequency band generated by the antenna radiator 30 between the second ground point D and the first feed point B and the first tuning circuit 50 under the excitation of the first feed. The first resonant mode corresponds to the resonant current as shown at I1 in fig. 6. Wherein the direction of the resonant current on the antenna radiator 30 between the second ground point D and the first feed point B is the same as the direction of the resonant current on the first tuning circuit 50. The electrical length of the antenna radiator 30 between the second ground point D and the first feed point B may be less than 1/4 wavelength of the first frequency band and greater than or equal to 1/8 wavelength of the first frequency band.

By making the first tuning circuit 50 capacitive, the first tuning circuit 50 is electrically connected between the first feed point B and the first feed 10, and one end of the first tuning circuit 50 is grounded, so that the antenna radiator 30 between the second ground point D and the first feed point B and the first tuning circuit 50 form a series LC resonant circuit, and a CRLH mode can be generated on the antenna radiator 30 between the second ground point D and the first feed point B.

In one possible embodiment, as shown in fig. 8, antenna assembly 100 further includes a second tuning circuit 60. The second tuning circuit 60 may include the circuits shown in any of the figures a-h of fig. 7 described above. Unlike the first tuning circuit 50, the second tuning circuit 60 is inductive. In other words, the second tuning circuit 60 includes at least one inductance. When the second tuning circuit 60 comprises an inductance and a capacitance, the second tuning circuit 60 is inductive to the signal of the second frequency band. Taking the second tuning circuit 60 as an example of the second tuning circuit 60 shown in fig. 7 a, the relationship between the second tuning circuit 60 and the second frequency band satisfies: Wherein f ₂ Is the center frequency of the second frequency band; l (L) ₂ An inductance for the second tuning circuit 60; c (C) ₂ Is the capacitance of the second tuning circuit 60. Of course, in other embodiments, second tuning circuit 60 may include an inductance but not a capacitance.

The second tuning circuit 60 is electrically connected between the second feed point E and the second feed 20. It will be appreciated that one end of the second tuning circuit 60 is electrically connected to the second feed point E and the other end of the second tuning circuit 60 is electrically connected to the second feed 20. The second tuning circuit 60 may be directly electrically connected to the second feeding point E or indirectly electrically connected to the second feeding point E. For example: the second tuning circuit 60 and the second feeding point E may be directly soldered, or electrically connected by electrical connectors such as coaxial lines, microstrip lines, conductive clips, conductive adhesives, circuit boards, etc. The second tuning circuit 60 may be directly electrically connected to the second feed 20 or indirectly electrically connected to the second feed. For example: the second tuning circuit 60 and the second feed source 20 may be directly soldered, or electrically connected through electrical connectors such as coaxial lines, microstrip lines, conductive clips, conductive adhesives, circuit boards, etc.

The second resonant mode includes an IFA mode of the antenna radiator 30 between the first ground point C and the second free end F supporting the second frequency band generated by the excitation of the second feed. The second resonant mode corresponds to the resonant current as shown at I2 in fig. 8. Wherein the electrical length of the antenna radiator 30 between the first ground point C and the second free end F may be equal to or close to 1/4 wavelength of the second frequency band.

By providing the second tuning circuit 60 between the second feed point E and the second feed 20 in an inductive manner, the electrical length of the antenna radiator 30 between the first ground point C and the second free end F can be tuned such that the antenna radiator 30 between the first ground point C and the second free end F is capable of generating IFA modes supporting the second frequency band under the excitation of the second feed.

In the above embodiment, the first resonant mode includes the CRLH mode supporting the first frequency band generated by the antenna radiator 30 between the second ground point D and the first feed point B and the first tuning circuit 50 under the excitation of the first feed source, and the second resonant mode includes the IFA mode supporting the second frequency band generated by the antenna radiator 30 between the first ground point C and the second free end F under the excitation of the second feed source, and since the CRLH mode and the IFA mode have different resonant current distribution conditions, that is, the first resonant mode and the second resonant mode are different, the isolation of the antenna assembly 100 can be further increased and the efficiency of the antenna assembly 100 can be improved.

As shown in fig. 9, when the filter unit 40 is configured to include the first filter circuit 401 and the first ground member 403, the first resonance mode includes a first resonance current generated on the antenna radiator 30 between the first ground point C and the first feeding point B, and a second resonance current generated on the antenna radiator 30 between the second ground point D and the first ground point C, the direction of the second resonance current is the same as that of the first resonance current, and the intensity of the second resonance current is weaker than that of the first resonance current. The first resonant current may be referred to as I11 in fig. 9. The second resonant current may be referred to as I12 in fig. 9. It can be appreciated that the first resonant current is distributed from the first ground point C to the first feeding point B. The second resonant current is distributed between the second ground point D and the first ground point C. In fig. 9 of the present application, a first resonant current with a relatively strong intensity is indicated by a solid line, and a second resonant current with a relatively weak intensity is indicated by a broken line.

The first resonant current is uniformly distributed between the first grounding point C and the first feeding point B. The second resonant current is uniformly distributed between the second ground point D and the first ground point C. It will be appreciated that the first resonant current is not significantly strongly or weakly partitioned. The second resonant current is not significantly strongly or weakly partitioned. The first resonant current is uniformly distributed between the first grounding point C and the first feeding point B, namely, the current intensity area in the first resonant mode is uniformly distributed between the first grounding point C and the first feeding point B, so that the anti-hand holding performance in the first resonant mode can be improved.

As shown in fig. 10, when the filter unit 40 is configured to include the first filter circuit 401 and the first ground member 403, the second resonant mode includes a third resonant current generated on the antenna radiator 30 between the first ground point C and the second free end F, and the third resonant current is distributed from strong to weak between the first ground point C and the second free end F. The third resonant current can be referred to as I23 in fig. 10. The third resonant current is distributed between the first ground point C and the second free end F. The first grounding point C forms a current strong point of the third resonance current, and the second free end F forms a current weak point of the third resonance current.

As shown in fig. 11, when the filter unit 40 is configured to include the second filter circuit 402 and the second ground 404, the first resonance mode includes a fourth resonance current generated on the antenna radiator 30 between the second ground point D and the first feeding point B. The fourth resonant current can be referred to as I14 in fig. 11. It can be appreciated that the fourth resonant current is distributed from the second ground point D to the first feeding point B. The fourth resonant current is not significantly strongly or weakly partitioned.

As shown in fig. 12, when the filter unit 40 is configured to include the second filter circuit 402 and the second ground 404, the second resonance mode includes a fifth resonance current generated on the antenna radiator 30 between the second ground point D and the second free end F, and a sixth resonance current generated on the antenna radiator 30 between the first ground point C and the second ground point D, and the direction of the sixth resonance current is the same as the direction of the fifth resonance current. The fifth resonant current can be referred to as I25 in fig. 12. The sixth resonant current may be referenced to I26 in fig. 12. It can be appreciated that the fifth resonant current is distributed from the second ground point D to the second free end F. The sixth resonant current is distributed between the first ground point C and the second ground point D. The fifth resonant current forms a current strong point at the second ground point D and a current weak point at the second free end F. The sixth resonant current forms a strong current point at the first ground point C and a weak current point at the second free end F. In fig. 12 of the present application, the fifth resonance current I25 is indicated by a broken line, and the sixth resonance current I26 is indicated by a solid line.

As shown in fig. 13, when the filter unit 40 is configured to include both the first filter circuit 401 and the second filter circuit 402, the first resonance mode includes a seventh resonance current generated on the antenna radiator 30 between the second ground point D and the first feeding point B. The seventh resonant current can be referred to as I17 in fig. 13. It can be appreciated that the seventh resonant current is distributed from the second ground point D to the first feeding point B. The seventh resonant current has no significant strong or weak partitioning.

As shown in fig. 14, when the filter unit 40 is configured to include both the first filter circuit 401 and the second filter circuit 402, the second resonance mode includes an eighth resonance current generated on the antenna radiator 30 between the first ground point C and the second free end F, which is distributed from strong to weak between the first ground point C and the second free end F. The eighth resonant current can be referenced to I28 in fig. 14. The eighth resonant current is distributed between the first ground point C and the second free end F. The first grounding point C forms a current strong point of the eighth resonance current, and the second free end F forms a current weak point of the eighth resonance current.

The electrical length of the antenna radiator 30 described in this applicationThe relation is satisfied: / >Where L is the physical length of the corresponding antenna radiator 30, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time of the electrical or electromagnetic signal in the free scene.

In one possible embodiment, as shown in fig. 15, the electrical length of the antenna radiator 30 between the second ground point D and the first free end a is less than 1/4 wavelength of the first frequency band and greater than 1/8 wavelength of the first frequency band. The electrical length of the antenna radiator 30 between the first feed point B and the first free end a is less than 1/8 wavelength of the first frequency band. The electrical length of the antenna radiator 30 between the first feed point B and the first ground point C is greater than the electrical length of the antenna radiator 30 between the first feed point B and the first free end a.

The length of the antenna radiator 30 between the first ground point C and the first feeding point B may be referred to as L1 shown in fig. 15. The length of the antenna radiator 30 between the second ground point D and the first ground point C may be referred to L2 shown in fig. 15. The length of the antenna radiator 30 between the first feeding point B and the first free end a may refer to L3 shown in fig. 15. The length of the antenna radiator 30 between the second ground point D and the first free end a is equal to l1+l2+l3.

Alternatively, the length of the antenna radiator 30 between the first ground point C and the first feed point B may be equal to or close to 1/8 wavelength of the first frequency band. The length of the antenna radiator 30 between the first feeding point B and the first free end a may be less than or equal to 5mm. The length of the antenna radiator 30 between the second ground point D and the first ground point C may be less than 1/4 wavelength of the first frequency band minus the sum of L1 and L3.

By making the electrical length of the antenna radiator 30 between the second ground point D and the first free end a smaller than 1/4 wavelength of the first frequency band and larger than 1/8 wavelength of the first frequency band, the electrical length of the antenna radiator 30 between the first feed point B and the first free end a smaller than 1/8 wavelength of the first frequency band, the electrical length of the antenna radiator 30 between the first feed point B and the first ground point C larger than the electrical length of the antenna radiator 30 between the first feed point B and the first free end a, it is advantageous that when the filter unit 40 is configured to include the first filter circuit 401 and the first ground 403, the antenna radiator 30 between the first ground point C and the first feed point B is capable of generating CRLH modes supporting the first frequency band under excitation of the first feed source, and the antenna radiator 30 between the second ground point D and the first feed point B is capable of generating CRLH modes supporting the first frequency band under excitation of the first feed source; advantageously, when the filter unit 40 is configured to comprise the second filter circuit 402 and the second ground 404 and when the filter unit 40 is configured to comprise both the first filter circuit 401 and the second filter circuit 402, the antenna radiator 30 between the second ground point D and the first feed point B is enabled to generate a CRLH mode supporting the first frequency band under the excitation of the first feed.

In one possible embodiment, as shown in fig. 16, the electrical length of the antenna radiator 30 between the second ground point D and the second free end F is less than 1/4 wavelength of the second frequency band and greater than 1/8 wavelength of the second frequency band. The electrical length of the antenna radiator 30 between the first ground point C and the second free end F is less than or equal to 1/4 wavelength of the second frequency band.

The length of the antenna radiator 30 between the second ground point D and the second free end F may refer to L4 shown in fig. 16. The length of the antenna radiator 30 between the first ground point C and the second free end F can be referred to as L5 in fig. 16.

Alternatively, the length L4 of the antenna radiator 30 between the second ground point D and the second free end F may be less than 1/4 wavelength of the second frequency band and greater than 1/8 wavelength of the second frequency band. The length L5 of the antenna radiator 30 between the first ground point C and the second free end F may be less than or equal to 1/4 wavelength of the second frequency band.

By having the electrical length of the antenna radiator 30 between the second ground point D and the second free end F smaller than 1/4 wavelength of the second frequency band and larger than 1/8 wavelength of the second frequency band, the electrical length of the antenna radiator 30 between the first ground point C and the second free end F smaller than or equal to 1/4 wavelength of the second frequency band advantageously enables the antenna radiator 30 between the first ground point C and the second free end F to generate IFA modes supporting the second frequency band under the excitation of the second feed when the filter unit 40 is configured to comprise the first filter circuit 401 and/or the second filter circuit 402.

Wherein the second frequency band is lower than the first frequency band. Optionally, the second frequency band and the first frequency band are both located in a low frequency band (less than 1 GHz), and the second frequency band is lower than the first frequency band; or the second frequency band is positioned in the low frequency band, and the first frequency band is positioned in the medium-high frequency band (1 GHz-3 GHz); or the second frequency band and the first frequency band are both positioned in the medium-high frequency band, and the second frequency band is lower than the first frequency band; alternatively, the second frequency band is located in a medium-high frequency band, and the first frequency band is located in an ultra-high frequency band (greater than 3 GHz).

In one possible embodiment, the second frequency band may be located in a low frequency band, for example: b5 band/N5 band (uplink 824-849 MHz; downlink 869-894 MHz), B8 band/N8 band (uplink 880-915 MHz; downlink 925-960 MHz), B20 band/N20 band (uplink 832-862 MHz; downlink 791-821 MHz), B28 band/N28 band (uplink 703-748 MHz; downlink 758-803 MHz), etc. The first frequency band may be located in a medium-high frequency band, for example: b1 band/N1 band (uplink 1920 MHz-1980 MHz; downlink 2110 MHz-2170 MHz), B2 band/N2 band (uplink 1850 MHz-1910 MHz; downlink 1930 MHz-1990 MHz), B3 band/N3 band (uplink 1710 MHz-1785 MHz; downlink 1805 MHz-1800 MHz), B4 band/N4 band (uplink 1710 MHz-1755 MHz; downlink 2110 MHz-2155 MHz), B7 band/N7 band (uplink 2500 MHz-2570 MHz; downlink 2620 MHz-2690 MHz), B34 band/N34 band (2010 MHz-2025 MHz), B38 band/N38 band (2570 MHz-2620 MHz), B39 band/N39 band (1880 MHz-1920 MHz), B40 band/N40 band (2300 MHz-2400 MHz), B41/N41 band (2490 MHz-2690 MHz), L1, GPS L5, bluetooth 2.4GHz, etc.

It will be appreciated that the antenna radiator 30 between the second ground point D and the first feed point B produces a first resonant mode supporting the higher frequency band. The antenna radiator 30 between the first ground point C and the second free end F generates a second resonant mode supporting a lower frequency band.

Since the IFA mode itself has higher efficiency and the CRLH mode current distribution is uniformly less affected by the environment, by enabling the CRLH mode to support a first frequency band that is relatively higher and the IFA mode to support a second frequency band that is relatively lower, the efficiency of the antenna assembly 100 in both the first frequency band and the second frequency band can be compromised. In addition, since the CRLH mode has less effect when the electrical length of the antenna radiator 30 is changed, the frequency offset of the antenna assembly 100 can be reduced by having the CRLH mode support a first frequency band that is relatively high and the IFA mode support a second frequency band that is relatively low.

When the second frequency band is lower than the first frequency band, the filtering unit 40 may be configured to include a first filtering circuit 401 and a first ground 403. At this time, the first ground point C to the first feeding point B of the antenna radiator 30 may generate a first sub-resonance mode supporting the first frequency band and the second ground point D to the first feeding point B of the antenna radiator 30 may generate a second sub-resonance mode supporting the first frequency band, and the first sub-resonance mode and the second sub-resonance mode form a first resonance mode. The first ground point C to the second free end F of the antenna radiator 30 may generate a second resonant mode supporting a second frequency band.

Since the second frequency band is lower than the first frequency band, the antenna radiator 30 between the first ground point C and the second free end F needs to have a long electrical length, and by configuring the filter unit 40 to include the first filter circuit 401 and the first ground member 403, the length of the antenna radiator 30 can be effectively reduced without guaranteeing the isolation and efficiency, thereby contributing to miniaturization of the antenna assembly 100. In one possible embodiment, compared to the technical solution that the antenna branches supporting the first frequency band and the second frequency band are independently arranged, the length of the antenna radiator 30 can be reduced by 10% -40% under the condition that the isolation and the efficiency are not reduced.

Alternatively, as shown in fig. 17, the first filter circuit 401 includes a first inductor 410 and a first capacitor 411 connected in series. The first filter circuit 401 is capacitive to signals of the second frequency band. It will be appreciated that the first filter circuit 401 forms an open circuit for signals in the second frequency band. Wherein, the relation between the first filter circuit 401 and the second frequency band satisfies:wherein f ₂ Is the center frequency of the second frequency band; l (L) ₃ An inductance value of the first filter circuit 401; c (C) ₃ Is the capacitance value of the first filter circuit 401. The resonant current of the first resonant mode may be returned to ground via the first filter circuit 401, while the resonant current of the second resonant mode may not be returned to ground via the first filter circuit 401. Of course, in other embodiments, the first filter circuit 401 may also include the circuits shown in any of the diagrams c-h in fig. 7.

As shown in fig. 18, the second filter circuit 402 includes a second inductor 420 and a second capacitor 421 connected in series. The second filter circuit 402 is sensitive to signals of the first frequency band. It will be appreciated that the second filter circuit 402 forms an open circuit for signals of the first frequency band. Wherein, the relation between the second filter circuit 402 and the first frequency band is satisfied:wherein f ₁ Is the center frequency of the first frequency band; l (L) ₄ Is the power of the second filter circuit 402A sensory value; c (C) ₄ Is the capacitance value of the second filter circuit 402. The resonant current of the first resonant mode cannot pass back through the second filter circuit 402 to ground, while the resonant current of the second resonant mode can pass back through the second filter circuit 402 to ground. Of course, in other embodiments, the second filter circuit 402 may also include the circuits shown in any of the diagrams c-h of fig. 7.

By making the first filter circuit 401 include the first inductor 410 and the first capacitor 411 connected in series, the first filter circuit 401 is capacitive to the signal in the second frequency band, and can form a larger capacitive impedance for the relatively lower second frequency band, so as to realize that the first filter circuit 401 passes the signal in the first frequency band and filters the signal in the second frequency band. By making the second filter circuit 402 include the second inductor 420 and the second capacitor 421 connected in series, the second filter circuit 402 is inductive to the signal in the first frequency band, and can form a larger inductive impedance for the relatively higher first frequency band, so as to realize that the second filter circuit 402 passes the signal in the second frequency band and filters the signal in the first frequency band. In addition, the first filter circuit 401 and the second filter circuit 402 have simple structures and are easy to manufacture.

Optionally, the second frequency band is located in a low frequency band. The second frequency band is exemplified as the B28 frequency band in the following embodiments unless explicitly stated. The first frequency band is a GPS frequency band. For example: the first frequency band may be a GPS-L1 frequency band or a GPS-L5 frequency band. The following embodiments take the GPS-L1 band as an example of the second band, unless explicitly stated otherwise. The embodiment realizes the common branches of the low-frequency band and the GPS frequency band, and the design with high isolation and high efficiency.

As shown in fig. 19, the antenna radiator 30 includes a first radiation section 301 and a second radiation section 302 connected in a bent manner. The end of the first radiation section 301 far away from the second radiation section 302 forms a first free end a, and the first feeding point B and the first grounding point C are both disposed on the first radiation section 301. The end of the second radiating section 302, which is far away from the first radiating section 301, forms a second free end F, and the second grounding point D and the second feeding point E are both disposed on the second radiating section 302.

Wherein, the first radiation section 301 may be disposed on the top frame 21, and the second radiation section 302 may be disposed on the first side frame 22; alternatively, the first radiating section 301 may be disposed on the first side frame 22, and the second radiating section 302 may be disposed on the top frame 21; alternatively, the first radiating section 301 may be provided on the top rim 21, and the second radiating section 302 may be provided on the second side rim 24. In the following embodiments, the first radiation section 301 is disposed on the top frame 21, and the second radiation section 302 is disposed on the first side frame 22, unless explicitly stated otherwise.

By arranging the antenna radiator 30 between the second ground point D and the first feeding point B supporting the first frequency band more on the top frame 21, and arranging the antenna radiator 30 between the first ground point C and the second free end F supporting the second frequency band more on the first side frame 22, that is, the resonance current of the first resonance mode is mainly distributed along the lateral direction of the electronic device 1000 and the resonance current of the second resonance mode is mainly distributed along the longitudinal direction of the electronic device 1000, the isolation degree of the antenna assembly 100 can be further increased and the efficiency of the antenna assembly 100 can be improved. In addition, for the embodiment in which the second frequency band is located in the low frequency band and the first frequency band is the GPS frequency band, the antenna radiator 30 includes a first radiation section 301 and a second radiation section 302 that are connected in a bent manner, where the first radiation section 301 is located in the top frame 21 and the second radiation section 302 is located in the first side frame 22, which is more beneficial to improving the communication performance between the low frequency band and the GPS frequency band.

The junction between the first radiation segment 301 and the second radiation segment 302 forms a target corner point G. The distance between the second grounding point D and the target corner point G is smaller than or equal to 1/16 wavelength of the second frequency band. In one possible embodiment, the distance between the second ground point D and the target corner point G may be less than or equal to 10mm. The distance between the first grounding point C and the target corner point G is smaller than the distance between the second grounding point D and the target corner point G. In one possible embodiment, the distance between the first ground point C and the target corner point G may be less than or equal to 1/2 of the distance between the second ground point D and the target corner point G.

By making the distance between the second ground point D and the target corner point G less than or equal to 1/16 wavelength of the second frequency band, more longitudinal current can be excited on the reference floor 3, thereby improving the efficiency of the antenna assembly 100 for communication in the second frequency band. And the distance between the first grounding point C and the target corner point G is smaller than the distance between the second grounding point D and the target corner point G, which is beneficial to reducing the length of the antenna radiator 30 between the second grounding point D and the first grounding point C when the distance between the second grounding point D and the target corner point G is smaller than or equal to 1/16 wavelength of the second frequency band, so that the electrical length of the antenna radiator 30 between the second grounding point D and the first free end a is beneficial to being smaller than 1/4 wavelength of the first frequency band, so that the antenna radiator 30 between the second grounding point D and the first feed point B can generate a first resonance mode supporting the first frequency band under the excitation of the first feed source.

Referring to fig. 20 to 22, fig. 20 is a schematic structural diagram of the antenna assembly 100 according to the embodiment of the present application, with the second grounding point D of the antenna radiator 30 and the filtering unit 40 removed. Fig. 21 is a graph of return loss curve (S11) and isolation (S12) of the antenna assembly of fig. 20. Fig. 22 is a graph of efficiency of the antenna assembly of fig. 20. Curve a in fig. 21 is a return loss curve of the antenna assembly shown in fig. 20. Curve b in fig. 21 is an isolation curve of the antenna assembly shown in fig. 20. Curve c in fig. 22 is a radiation efficiency curve when the antenna assembly shown in fig. 20 supports a low frequency band. Curve d in fig. 22 is a system efficiency curve of the antenna assembly of fig. 20 when supporting a low frequency band. Curve e in fig. 22 is the radiation efficiency curve of the antenna assembly of fig. 20 when supporting GPS L1. Curve f in fig. 22 is a system efficiency curve for the antenna assembly of fig. 20 when supporting GPS L1. From curve a in fig. 21, it can be seen that the antenna assembly of fig. 20 has an S11 of about-6 dB in the low frequency band and an S11 of about-17 dB in the GPS L1 band. From the graph b of fig. 21, it can be seen that the isolation of the antenna assembly shown in fig. 20 is-22 dB in the low frequency band, and-21 dB in the S11 isolation in the GPS L1 band. It can be seen from curve c in fig. 22 that the radiation efficiency of the antenna assembly of fig. 20 in the low frequency band is about-2.3 dB. It can be seen from curve d in fig. 22 that the radiation efficiency of the antenna assembly of fig. 20 in the low frequency band is about-5.5 dB. It can be seen from curve e in fig. 22 that the radiation efficiency of the antenna assembly 100 in the GPS L1 band is about-0.37 dB with the second ground point D of the antenna radiator 30 and the filter unit 40 removed. From curve f in fig. 22, it can be seen that the radiation efficiency of the antenna assembly of fig. 20 in the GPS L1 band is about-0.4 dB.

Referring to fig. 23 to 25, fig. 23 is a schematic structural diagram of the antenna assembly 100 according to the embodiment of the present application with the filtering unit 40 removed. Fig. 24 is a return loss curve and isolation curve for the antenna assembly of fig. 23. Fig. 25 is a graph of efficiency of the antenna assembly of fig. 23. Curve g in fig. 24 is the return loss curve of the antenna assembly of fig. 23. Curve h in fig. 24 is an isolation curve of the antenna assembly shown in fig. 23. Fig. 25 is a graph j showing the radiation efficiency of the antenna assembly shown in fig. 23 when supporting a low frequency band. Curve k in fig. 25 is a system efficiency curve for the antenna assembly of fig. 23 when supporting low frequency bands. Curve m in fig. 25 is a radiation efficiency curve of the antenna assembly shown in fig. 23 when supporting GPS L1. Curve n in fig. 25 is a system efficiency curve for the antenna assembly of fig. 23 when supporting GPS L1. From the graph g of fig. 24, it can be seen that the antenna assembly of fig. 23 has an S11 of about-11 dB in the low frequency band and an S11 of about-18 dB in the GPS L1 band. As can be seen from the curve h in FIG. 24, the isolation of the antenna assembly shown in FIG. 23 is-20 dB in the low frequency band and-31 dB in the S11 isolation in the GPS L1 band. It can be seen from the graph j in fig. 25 that the radiation efficiency of the antenna assembly of fig. 23 in the low frequency band is about-2.6 dB. It can be seen from curve k in fig. 25 that the radiation efficiency of the antenna assembly of fig. 23 is about-7.3 dB. From the graph m of fig. 25, it can be seen that the radiation efficiency of the antenna assembly of fig. 23 in the GPS L1 band is about-0.34 dB. From fig. 25, it can be seen that the radiation efficiency of the antenna assembly of fig. 23 in the GPS L1 band is about-4 dB.

Referring to fig. 26 and 27, fig. 26 is a return loss curve and an isolation curve of the antenna assembly 100 according to an embodiment of the present application. Fig. 27 is an efficiency graph of the antenna assembly 100 provided in an embodiment of the present application. Curve p in fig. 26 is a return loss curve of the antenna assembly 100 of the present application. Curve q in fig. 26 is an isolation curve of the antenna assembly 100 of the present application. Curve r in fig. 27 is a radiation efficiency curve of the antenna assembly 100 of the present application in the second resonant mode. Curve s in fig. 27 is a system efficiency curve of the antenna assembly 100 of the present application in the second resonant mode. Curve t in fig. 27 is a radiation efficiency curve of the antenna assembly 100 of the present application in the first resonant mode. Curve u in fig. 27 is a system efficiency curve of the antenna assembly 100 of the present application in the first resonant mode. From curve p in fig. 26, it can be seen that the antenna assembly 100 of the present application has an S11 of about-7 dB in the second frequency band and an S11 of about-17 dB in the first frequency band. As can be seen from curve q in fig. 26, the isolation of the antenna assembly 100 of the present application is-36 dB in the second frequency band, and the isolation of S11 in the first frequency band is-28 dB. As can be seen from the curve r in fig. 27, the radiation efficiency of the antenna assembly 100 of the present application in the second frequency band is about-2.3 dB. As can be seen from curve s in fig. 27, the radiation efficiency of the antenna assembly 100 of the present application in the second frequency band is about-6.9 dB. As can be seen from curve t in fig. 27, the radiation efficiency of the antenna assembly 100 of the present application in the first frequency band is about-0.34 dB. As can be seen from curve u in fig. 27, the radiation efficiency of the antenna assembly 100 of the present application in the first frequency band is about-0.4 dB.

As shown in fig. 28, fig. 28 is a graph comparing isolation curves of the antenna assemblies according to the above three embodiments. Curve b in fig. 28 is an isolation curve of the antenna assembly shown in fig. 20. Curve h in fig. 28 is an isolation curve of the antenna assembly shown in fig. 23. Curve q in fig. 28 is an isolation curve of the antenna assembly 100 provided in the present application. As can be seen from comparing curve b, curve h and curve q in fig. 28, the isolation of the antenna assembly 100 in the second frequency band provided in the present application is higher than the isolation of the antenna assembly in the low frequency band shown in fig. 20, and is higher than the isolation of the antenna assembly in the low frequency band shown in fig. 23, and the isolation of the antenna assembly 100 in the first frequency band provided in the present application is higher than the isolation of the antenna assembly in the GPS L1 frequency band shown in fig. 20, and is slightly lower than the isolation of the antenna assembly in the GPS L1 frequency band shown in fig. 23.

Fig. 29 shows a comparison graph of efficiency curves of the antenna assembly of the above three solutions in the GPS L1 frequency band, as shown in fig. 29. Curve a1 in fig. 29 is a radiation efficiency curve of the antenna assembly shown in fig. 23. Curve a2 in fig. 29 is a radiation efficiency curve of the antenna assembly 100 provided in the present application. Curve a3 in fig. 29 is a radiation efficiency curve of the antenna assembly shown in fig. 20. Comparing the curves a1, a2 and a3 in fig. 29 can show that the radiation efficiency of the antenna assembly 100 provided in the present application in the first frequency band is slightly higher than the radiation efficiency of the antenna assembly shown in fig. 20 in the GPS L1 frequency band, and is slightly higher than the radiation efficiency of the antenna assembly shown in fig. 23 in the GPS L1 frequency band. Curve a4 in fig. 29 is a system efficiency curve for the antenna assembly of fig. 23. Curve a5 in fig. 29 is a system efficiency curve of the antenna assembly 100 provided in the present application. Curve a6 in fig. 29 is a system efficiency curve of the antenna assembly of fig. 20. Comparing the curve a4, the curve a5 and the curve a6 in fig. 29 can show that the system efficiency of the antenna assembly 100 in the first frequency band provided in the present application is slightly higher than the system efficiency of the antenna assembly in the GPS L1 frequency band shown in fig. 20, and is slightly higher than the system efficiency of the antenna assembly in the GPS L1 frequency band shown in fig. 23.

As shown in fig. 30, fig. 30 is a graph comparing efficiency curves of the antenna assemblies of the above three solutions in a low frequency band. Curve a7 in fig. 30 is a radiation efficiency curve of the antenna assembly shown in fig. 23. Curve a8 in fig. 30 is a radiation efficiency curve of the antenna assembly 100 provided in the present application. Curve a9 in fig. 30 is a radiation efficiency curve of the antenna assembly shown in fig. 20. Comparing the curves a7, a8 and a9 in fig. 30 can show that the radiation efficiency of the antenna assembly 100 provided in the present application in the second frequency band is slightly higher than the radiation efficiency of the antenna assembly shown in fig. 20 in the low frequency band, and is slightly higher than the radiation efficiency of the antenna assembly shown in fig. 23 in the low frequency band. Curve b1 in fig. 30 is a system efficiency curve of the antenna assembly of fig. 23. Curve b2 in fig. 30 is a system efficiency curve of the antenna assembly 100 provided in the present application. Curve b3 in fig. 30 is a system efficiency curve of the antenna assembly of fig. 20. As can be seen from comparing the curves b1, b2 and b3 in fig. 30, the system efficiency of the antenna assembly 100 in the second frequency band provided in the present application is higher than the system efficiency of the antenna assembly in the low frequency band shown in fig. 23, and slightly lower than the system efficiency of the antenna assembly in the low frequency band shown in fig. 20.

As can be seen from the above fig. 28 to 30, the antenna assembly 100 provided in the present application can consider the isolation and the efficiency, and is an optimal solution for considering the isolation and the efficiency in three technical solutions as a whole. In addition, the low-frequency radiator and the GPS L1 radiator of the antenna assembly 100 provided in the present application may multiplex a part of the radiation sections of the partial antenna radiator 30, and under the condition of the same isolation and efficiency, the antenna radiator 30 is reduced to 67% of the antenna radiator of the antenna assembly shown in fig. 20; compared with the antenna assembly shown in fig. 20, the antenna assembly 100 provided by the application has the advantages that the isolation between the LB frequency band and the GPS L1 frequency band is respectively improved by 14dB and 7dB on the premise of not affecting the efficiency; and compared with the antenna assembly shown in fig. 23, the antenna assembly 100 provided by the application has the advantages that the isolation in the LB frequency band is improved by 8dB, and meanwhile, the efficiency in the LB frequency band is improved by 0.3dB.

The features mentioned in the description, in the claims and in the drawings may be combined with one another at will as far as they are relevant within the scope of the present application. The advantages and features described for the antenna assembly 100 apply in a corresponding manner to the electronic device 1000.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present application, and that variations, modifications, alternatives and alterations of the above embodiments may be made by those skilled in the art within the scope of the present application, which are also to be regarded as being within the scope of the protection of the present application.

Claims

1. An antenna assembly, comprising:

a first feed;

a second feed;

2. The antenna assembly of claim 1, further comprising a first tuning circuit, the first tuning circuit being capacitive, the first tuning circuit being electrically connected between the first feed point and the first feed source, and one end of the first tuning circuit being grounded, the first resonant mode comprising the antenna radiator between the second ground point and the first feed point, and a CRLH mode supporting the first frequency band generated by the first tuning circuit under excitation of the first feed source.

3. The antenna assembly according to claim 2, wherein when the filter unit is configured to include the first filter circuit and the first ground, the first resonant mode includes a first resonant current generated on the antenna radiator between the first ground point and the first feed point, and a second resonant current generated on the antenna radiator between the second ground point and the first ground point, the second resonant current having a direction identical to a direction of the first resonant current, and a strength of the second resonant current being weaker than a strength of the first resonant current.

4. The antenna assembly of claim 3 wherein the first resonant current is uniformly distributed between the first ground point to the first feed point.

5. The antenna assembly of claim 2, wherein an electrical length of the antenna radiator between the second ground point and the first free end is less than 1/4 wavelength of the first frequency band and greater than 1/8 wavelength of the first frequency band, an electrical length of the antenna radiator between the first feed point and the first free end is less than 1/8 wavelength of the first frequency band, and an electrical length of the antenna radiator between the first feed point and the first ground point is greater than an electrical length of the antenna radiator between the first feed point and the first free end.

6. The antenna assembly of claim 1 further comprising a second tuning circuit, the second tuning circuit being inductive, the second tuning circuit being electrically connected between the second feed point and the second feed, the second resonant mode comprising an IFA mode of the antenna radiator between the first ground point and the second free end that supports the second frequency band upon excitation by the second feed.

7. The antenna assembly of claim 6, wherein when the filter unit is configured to include the first filter circuit and the first ground, the second resonant mode includes a third resonant current generated on the antenna radiator between the first ground point and the second free end, the third resonant current being distributed from strong to weak between the first ground point and the second free end.

8. The antenna assembly of claim 6, wherein an electrical length of the antenna radiator between the second ground point and the second free end is less than 1/4 wavelength of the second frequency band and greater than 1/8 wavelength of the second frequency band, and wherein an electrical length of the antenna radiator between the first ground point and the second free end is less than or equal to 1/4 wavelength of the second frequency band.

9. The antenna assembly according to any one of claims 1 to 8, wherein the second frequency band is lower than the first frequency band.

10. The antenna assembly of claim 9, wherein the filter unit is configured to include the first filter circuit and not include the second filter circuit.

11. The antenna assembly of claim 9, wherein the first filter circuit comprises a first inductance and a first capacitance in series, the first filter circuit being capacitive to signals of the second frequency band.

12. The antenna assembly of claim 9, wherein the second filter circuit comprises a second inductance and a second capacitance in series, the second filter circuit being inductive to signals of the first frequency band.

13. The antenna assembly of claim 9, wherein the second frequency band is in a low frequency band and the first frequency band is a GPS frequency band.

14. The antenna assembly of any one of claims 1 to 8, 10 to 13, wherein the antenna radiator comprises a first radiating section and a second radiating section which are connected in a bent manner, wherein an end of the first radiating section away from the second radiating section forms the first free end, wherein the first feeding point and the first grounding point are both disposed on the first radiating section, wherein an end of the second radiating section away from the first radiating section forms the second free end, and wherein the second grounding point and the second feeding point are both disposed on the second radiating section.

15. The antenna assembly of claim 14, wherein a junction between the first radiating segment and the second radiating segment forms a target corner point, a distance between the second ground point and the target corner point is less than or equal to 1/16 wavelength of the second frequency band, and a distance between the first ground point and the target corner point is less than a distance between the second ground point and the target corner point.

16. An electronic device comprising a frame and the antenna assembly of any one of claims 1-15, the frame comprising a top frame and a side frame adjacent to each other, the antenna radiator between the first ground point and the first free end being disposed on the top frame, and the antenna radiator between the second ground point and the second free end being disposed on the side frame.