CN116315658A

CN116315658A - Antenna assembly and electronic equipment

Info

Publication number: CN116315658A
Application number: CN202310318849.2A
Authority: CN
Inventors: 林强; 田朝玉
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-06-23

Abstract

The application discloses an antenna assembly and electronic equipment belongs to the communication technology field. The antenna assembly includes: a first radiator and a tuning circuit; the first radiator comprises a first branch, a second branch and a third branch, a first fracture is formed between the first end of the first branch and the first end of the second branch, and the second end of the first branch is connected with the first end of the third branch; the first part of the second branch is grounded, and the first part is close to the second end of the second branch; a first feed point is arranged on the first branch knot and is used for being connected with a first feed source, and a second end of the first branch knot is grounded; the tuning circuit is respectively connected with the first branch and the third branch so as to adjust the resonant frequencies of the first branch and the third branch.

Description

Antenna assembly and electronic equipment

Technical Field

The application belongs to the technical field of communication, and particularly relates to an antenna assembly and electronic equipment.

Background

With the development of terminal products, mobile intelligent terminal devices, such as mobile phones and smart watches, wearable products need to support more and more communication modules, such as 4G, 5G, near field communication (Near Field Communication, NFC), global positioning system (Global Positioning System, GPS), wireless fidelity (Wireless Fidelity, wiFi), ultra Wideband (UWB), and the like. In this way, not only are so many antennas required to be designed on the terminal, but also each antenna needs to work independently to meet the requirements of different communication scenes, so that a large amount of space is required to set each antenna, which is not beneficial to reducing the size of the terminal.

Disclosure of Invention

An object of the embodiments of the present application is to provide an antenna assembly and an electronic device, which can support multiple frequency bands by using one antenna assembly, reduce the occupied space of a multi-band antenna, and further reduce the size of the electronic device configured with the antenna assembly.

In a first aspect, embodiments of the present application provide an antenna assembly, including: a first radiator and a tuning circuit;

the first radiator comprises a first branch, a second branch and a third branch, a first fracture is formed between the first end of the first branch and the first end of the second branch, and the second end of the first branch is connected with the first end of the third branch;

the first part of the second branch is grounded, and the first part is close to the second end of the second branch; a first feed point is arranged on the first branch knot and is used for being connected with a first feed source, and a second end of the first branch knot is grounded;

the tuning circuit is respectively connected with the first branch and the third branch so as to adjust the resonance frequencies of the first branch and the third branch.

In a second aspect, embodiments of the present application provide an electronic device comprising an antenna assembly according to the first aspect.

In an embodiment of the present application, an antenna assembly includes: a first radiator and a tuning circuit; the first radiator comprises a first branch, a second branch and a third branch, a first fracture is formed between the first end of the first branch and the first end of the second branch, and the second end of the first branch is connected with the first end of the third branch; the first part of the second branch is grounded, and the first part is close to the second end of the second branch; a first feed point is arranged on the first branch knot and is used for being connected with a first feed source, and a second end of the first branch knot is grounded; the tuning circuit is respectively connected with the first branch and the third branch so as to adjust the resonant frequencies of the first branch and the third branch. Through setting the radiator of same antenna to three stub, like this, tune each stub through tuned circuit, alright excite multiple radiation pattern on the radiator to can be the signal cover multiple frequency channel that a radiator radiated, can use an antenna assembly to support multiple frequency channel promptly, and then reduced the occupation space of multifrequency section antenna.

Drawings

Fig. 1 is a schematic structural diagram of a mobile phone side MHB antenna assembly in the related art;

fig. 2 is a schematic structural diagram of a first antenna assembly according to an embodiment of the present application;

fig. 3 is a schematic diagram of the current distribution in the same direction as excited by the antenna assembly shown in fig. 2;

FIG. 4 is a graph of S parameters for the antenna assembly shown in FIG. 2 and the MHB antenna assembly shown in FIG. 1;

FIG. 5 is a graph of system radiation efficiency and overall system efficiency for the antenna assembly shown in FIG. 2 and the MHB antenna assembly shown in FIG. 1;

FIG. 6 is a graph of S parameters for the antenna assembly of FIG. 2 as an LMB antenna;

fig. 7 is a schematic structural diagram of a second antenna assembly according to an embodiment of the present disclosure;

FIG. 8 is a graph of the overall system efficiency of the antenna assembly of FIG. 1 and the MHB antenna of the antenna assembly of FIG. 7;

fig. 9 is a graph of the radiation efficiency of the LB antenna of the antenna assembly shown in fig. 2 and the antenna assembly shown in fig. 7.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the related art, with the development of terminal products, mobile smart terminal devices, such as mobile phones and smart watches, wearable products need to support more and more communication modules, such as 4G, 5G, near field communication (Near Field Communication, NFC), global positioning system (Global Positioning System, GPS), wireless fidelity (Wireless Fidelity, wiFi), ultra Wide Band (UWB), and the like.

The Middle High Band (MHB) Band (1710 MHz to 2700 MHz) is mainly applied to 4G and 5G communications, and is used as a frequency Band range that is most widely applied as an end product.

The antenna assembly provided in the embodiments of the present application may use one radiator to cover multiple MHB bands and/or Low frequency (LB) bands, which can reduce the layout space of the antenna assembly compared to the antenna with multiple MHB bands and/or Low frequency (LB) bands respectively provided in the related art.

For example: as shown in fig. 1, the MHB antenna in the related art includes: radiator 101, feed 102 and tuning circuit 103; the radiator 101 includes two branches arranged at intervals, namely a branch A 'B' and a branch B 'D';

one end of the branch A ' B ' far away from the branch B ' D ' is grounded, and the other end of the branch B ' D ' far away from the branch A ' B ' is grounded, and the part C ' of the branch B ' D ' is connected with the feed source 102 through the tuning circuit 103. In this way, the resonant frequency of branch B 'D' can be tuned by tuning circuit 103.

In contrast, as shown in fig. 2, in the antenna assembly provided in the embodiment of the present application, the first radiator 10 includes three branches, that is, compared to the radiator 101 shown in fig. 1, the third branch DJ is added at the end of the branch B 'D' away from the branch a 'B', so that the effective radiating area of the antenna radiator can be increased by the third branch DJ, and the coverage frequency band of the antenna radiator is increased, so that one radiator can cover more frequency bands, and at least two radiators are avoided to cover the frequency bands.

The antenna assembly and the electronic device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings, by means of specific embodiments and application scenarios thereof.

As shown in fig. 2, a first antenna assembly provided in an embodiment of the present application may include: a first radiator 10 and a tuning circuit 20.

The first radiator 10 includes a first branch BD, a second branch AB, and a third branch DJ, wherein a first break B is formed between a first end of the first branch BD and a first end of the second branch AB, and a second end of the first branch BD is connected to a first end of the third branch DJ;

the first part A of the second branch AB is grounded, and the first part A is close to the second end of the second branch AB; the first branch BD is provided with a first feed point C, the first feed point C is used for being connected with a first feed source 40, and a second end D of the first branch BD is grounded;

the tuning circuit 20 is connected to the first and third branches BD and DJ, respectively, to adjust the resonance frequencies of the first and third branches BD and DJ.

Wherein, the first portion a is close to the second end of the second branch AB, which can be understood as: the distance between the first part A and the second end of the second branch AB is smaller than the distance between the first part A and the first end of the second branch AB.

As illustrated in the embodiment shown in fig. 2 to 7, the first branch BD, the second branch AB, and the third branch DJ are located on the same straight line, and in other embodiments, the first branch BD, the second branch AB, and the third branch DJ may be located on different straight lines, for example: the first branch BD, the second branch AB, and the third branch DJ are distributed on adjacent two side edges of the metal frame, and are not particularly limited herein.

In one embodiment, the second branch AB may be regarded as a port parasitic structure of the first antenna (Ant 1) corresponding to the first feed 40, and the length may be about 13.5 mm.

In one embodiment, the tuning circuit 20 may include an impedance matching network, a ground network, and the like, and in the embodiment shown in fig. 1, the tuning circuit 20 includes a first matching network 1 connected between the first feed point C and the first feed 40 of the first branch BD, a second matching network 3 connected between the second end D and the ground of the first branch BD, and a third matching network connected between the third branch DJ and the ground.

Optionally, as shown in fig. 1, the tuning circuit 20 includes: a first matching network 1, a second matching network 3 and a third matching network;

the first feed point C is used for being connected with the first feed source 40 through the first matching network 1, the second end of the first branch BD is grounded through the second matching network 3, and the second part of the third branch DJ is connected with the third matching network;

the first feeding point C is located between the first end of the first branch BD and the second end of the first branch BD, and the second portion is close to the second end of the third branch DJ;

the first matching network 1, the second matching network 3 and the third matching network are used for tuning the resonant frequency of the first branch BD and the third branch DJ, so that the resonant frequency f1 of the first branch BD is greater than the resonant frequency f3 of the third branch DJ and is smaller than the resonant frequency f2 of the second branch.

In one embodiment, the second location may include at least one connection point, each of which may be grounded through a third matching network.

Optionally, as shown in fig. 2, the second portion includes a first connection point G and a second connection point H that are spaced apart along the length direction of the third branch DJ;

the third matching network includes: a first sub-matching network 6 and a second sub-matching network 7;

the first connection point G is grounded via a first sub-matching network 6 and the second connection point H is grounded via a second sub-matching network 7.

In one embodiment, as shown in fig. 2, the first sub-matching network 6 and the second sub-matching network 7 may be two mutually independent sub-matching networks to implement respective tuning functions.

In another embodiment, as shown in fig. 7, the target sub-matching network 11 includes a first sub-matching network and a second sub-matching network, and the antenna assembly further includes:

a second switch module 12, the second switch module 12 being connected between the target sub-matching network 11 and the ground;

the second switch module 12 is used for grounding at least one of the first connection point G and the second connection point H through the target sub-matching network 11, or disconnecting the first connection point G and the second connection point H from ground through the target sub-matching network 11.

In this embodiment, the first sub-matching network 6 and the second sub-matching network 7 may share one target sub-matching network 11, and the second switch module 12 is disposed between the target sub-matching network 11 and the ground, so that tuning can be achieved by controlling the switch state of the second switch module 12, so as to achieve multi-band switching and multi-band radiation performance improvement.

As an optional implementation manner, the second matching network 3 provided in the embodiment of the present application includes a matching branch and a first switching module 4:

the first switch module 4 is connected between the matching branch circuit and the grounding piece;

wherein, under the condition that the matching branch is grounded through the first switch module 4, the radiation signal of the antenna assembly comprises a middle-high frequency band MHB signal;

in the case that the matching branch is disconnected from the ground by the first switch module 4, the radiation signal of the antenna assembly includes a low frequency band LB signal, and the first branch BD and the third branch DJ constitute an antenna radiation structure of LB.

It is worth mentioning that the second matching network 3 may comprise one or at least two matching branches, wherein if the second matching network 3 comprises at least two matching branches, the impedance values of the at least two matching branches may be different. At this time, the matching branch is grounded through the first switch module 4, and the first switch module 4 may pass at least part of the matching branch to the ground; the matching branches are disconnected from ground by the first switch module 4, and the first switch module 4 may disconnect all the matching branches in the second matching network 3 from ground.

In this embodiment, MHB and LB multiband switching can be achieved by the first switch module 4.

In one embodiment, as shown in fig. 2, the second portion further includes: the third connecting point E is arranged at intervals with the first connecting point G and is positioned at one side of the first connecting point G and the second connecting point H, which is close to the first end D of the third branch DJ;

the third matching network includes: a third sub-matching network 5;

the third connection point E is grounded via a third sub-matching network 5.

In one embodiment, the third sub-matching network 5 comprises a high frequency ground network or a ground network.

When the third sub-matching network 5 includes a high-frequency grounding network, the metal structure suspension design requirement of the SAR sensor design requirement can be compatible.

In one embodiment, in the case that the radiation signal of the antenna assembly includes a mid-high band MHB signal, i.e. the first switch module 4 connects the second end D of the first branch BD to ground, the third connection point E may be used as a lower point of the MHB antenna.

In one embodiment, in the case where the radiation signal of the antenna assembly includes the LB signal, that is, the second end D of the first branch BD is grounded by the first switch module 4, the third connection point E may be used as a lower point of the LB antenna, and in this case, the antenna radiation structure of the LB formed by the first branch BD and the third branch DJ may be all of the first branch BD, and the portion DE of the third branch DJ located at the left side of the third connection point E may jointly form the antenna radiation structure of the LB.

In another embodiment, as shown in fig. 7, the third connection point E is removed on the basis of the antenna assembly shown in fig. 2, and in the case that the radiation signal of the antenna assembly includes the LB signal, the second connection point H is grounded through the target sub-matching network 11 and the second switch module 12 to serve as a lower location of the LB antenna, where the antenna radiation structure formed by the first branch BD and the third branch DJ may BE the whole of the first branch BD, and the portion DH of the third branch DJ located on the left side of the second connection point H jointly forms the antenna radiation structure of the LB, compared with the LB antenna radiation structure BE in the antenna assembly shown in fig. 2, the LB antenna radiation structure BH in the antenna assembly shown in fig. 7 maximizes and uses the antenna structure as low-frequency antenna radiation, so that the low-frequency antenna radiation structure is longer, and the radiation performance of the low-frequency antenna is improved.

In this embodiment, the first matching network 1 and the second matching network 3 may be used to tune the first branch BD, and the third matching network may be used to tune the third branch DJ, so as to jointly implement that the resonant frequency f1 of the first branch BD is greater than the resonant frequency f3 of the third branch DJ and less than the resonant frequency f2 of the second branch AB, and the operating frequency of the antenna assembly includes the resonant frequency f1 of the first branch.

By making the resonant frequency f1 of the first branch BD smaller than the resonant frequency f2 of the second branch AB, the first radiation mode excited by the first branch BD and the second branch AB and operating at the resonant frequency f1 of the first branch can be distributed in a common mode and in the same direction.

By making the resonant frequency f1 of the first branch BD greater than the resonant frequency f3 of the third branch DJ, the second radiation mode excited by the first branch BD and the third branch DJ and operating at the resonant frequency f1 of the first branch may be distributed in a differential mode and in the same direction.

In this way, combining the first radiation mode with the common mode and the second radiation mode with the differential mode and the same current distribution, multiple radiation modes of excitation can be fused, that is, when the antenna assembly works at the resonant frequency of the first branch, the radiation mode of the first radiator includes the first radiation mode and the second radiation mode, and at this time, the current distribution is in the same direction on the whole first radiator 10, and a current path M2 of the same direction current distribution can be shown in fig. 3.

As shown in fig. 4 and 5, when the antenna assembly provided in the embodiment of the present application is used for radiating MHB signals, the antenna performance is improved compared to the S parameter and the system radiation efficiency of the MHB antenna in the related art as shown in fig. 1.

Specifically, in the graph of the input reflection coefficient S11, i.e., the input return loss parameter, as shown in fig. 4, the solid line represents the S-parameter curve when the antenna assembly provided in the embodiment of the present application is used for radiating an MHB signal, and the dotted line represents the S-parameter curve of the MHB antenna in the related art as shown in fig. 1. Therefore, compared with the MHB antenna in the related art as shown in fig. 1, the antenna assembly provided in the embodiment of the present application increases the coverage frequency band f3 of the MHB antenna, and can reduce the return loss of the antenna, thereby improving the radiation performance of the antenna.

In the graph of the system radiation efficiency and the system overall efficiency shown in fig. 5, it is assumed that the radiation pattern excited on the branches a 'B' and B 'D' in the MHB antenna in the related art shown in fig. 1 exhibits a common mode co-directional current distribution whose current path is M1 as shown in fig. 1. As can be seen from fig. 5, taking the antenna radiation signal as the B3 band as an example, the M2 co-directional current distribution in the embodiment shown in fig. 2 can improve the radiation efficiency of the antenna assembly as an MHB antenna compared to the M1 common mode co-directional current distribution shown in fig. 1.

It should be noted that, as shown in fig. 4 and 5, it is assumed that the branch a ' B ' of the MHB antenna in the related art as shown in fig. 1 is used as a fracture parasitic structure, and its resonant frequency is higher than that of the main branch structure of the branch B ' D ', so as to excite the common mode co-current distribution M1' of the two radiation modes of ' AB ' and ' BD ' operating at the main branch resonant frequency, which is the radiation mode of the antenna operating frequency.

In addition, the tuning circuit 20 in the embodiment of the present application may be connected to the first branch BD and the third branch DJ in other ways besides the first matching network 1 connected between the first feeding point C of the first branch BD and the first feed 40, the second matching network 3 connected between the second end D of the first branch BD and the ground, and the third matching network connected between the third branch DJ and the ground as shown in fig. 2, for example: a switch module is disposed between the tuning circuit 20 and the ground terminal to condition an equivalent capacitance and/or an equivalent resistance of the tuning circuit 20 using the switch module, etc., which is not particularly limited herein.

In an alternative embodiment, as shown in fig. 1, the third matching network may be divided into: a third sub-matching network 5, a first sub-matching network 6 and a second sub-matching network 7.

In one embodiment, the third connection point E on the third branch DJ connected to the third sub-matching network 5 may be used as an antenna ground point, and the third sub-matching network 5 may be directly connected to the ground, or a high-frequency ground network may be used, where the high-frequency ground network may include, but is not limited to, a capacitor device, and by setting the high-frequency ground network, a metal structure suspension design required by a specific absorption rate (Specific Absorption Ratio, SAR) sensing design may be compatible.

In one embodiment, the first sub-matching network 6 and the second sub-matching network 7 are of similar structures, specifically, the first sub-matching network 6 and/or the second sub-matching network 7 may include, but are not limited to, capacitive devices, inductive devices, parallel/series inductance-capacitance (Inductance Capacitance, LC) forms, or the first sub-matching network 6 and/or the second sub-matching network 7 may be opened to ground to meet the requirements of the compatible SAR sensor design, or the first sub-matching network 6 and/or the second sub-matching network 7 may be directly connected to the ground.

In this embodiment, when the antenna assembly radiates a signal, the first sub-matching network 6 and/or the second sub-matching network 7 may tune the resonant frequency on the third branch DJ based on the equivalent capacitance or inductance.

Optionally, as shown in fig. 1, an antenna assembly provided in an embodiment of the present application further includes: a second radiator 30;

a second break J is provided between the first end of the second radiator 30 and the second end of the third branch DJ, and a second feeding point is provided on the second radiator 30, and the second feeding point is used for connecting with the second feed source 50.

In this embodiment, the first sub-matching network 6 and the second sub-matching network 7 may be equivalent to a straight-through ground for the second antenna (Ant 2) corresponding to the second feed 50, that is, the first connection point G corresponding to the first sub-matching network 6 and the second connection point H corresponding to the second sub-matching network 7 may be used as the antenna ground point of the second radiator 30, and by providing two ground points, that is, the first connection point G and the second connection point H, the reliability of the antenna ground of Ant2 may be improved, and the probability that the performance of Ant2 is affected due to the unreliability of one ground point may be reduced.

In order to facilitate understanding of the antenna assembly provided in the embodiments of the present application, the following embodiments are taken as examples to illustrate the working principle of the antenna assembly provided in the embodiments of the present application:

example 1

For the antenna assembly shown in fig. 2, it includes the following two modes of operation:

in the first working mode, when the second end of the first branch BD is directly grounded through the second matching network 3 and the first switch module 4, the Ant1 achieves MHB frequency band coverage, the third connection point E is an antenna grounding point, the third sub-matching network 5 can be a grounding network directly grounded or can be a metal structure suspension design requirement adopting a high-frequency grounding network to meet SAR sensor design requirements, the first connection point G and the second connection point H are respectively used for loading the first sub-matching network 6 and the second sub-matching network 7, so that when the first radiator 10 is used for radiating MHB frequency band signals, the first sub-matching network 6 and the second sub-matching network 7 can tune the resonance frequency of the third branch DJ of the Ant1 based on equivalent capacitance or inductance, and for the high-frequency antenna Ant2 on the right side of the break J, the first sub-matching network 6 and the second sub-matching network 7 are equivalently directly grounded.

By tuning the resonant frequency f3 corresponding to the third branch DJ of Ant1, the resonant frequency f3 of the first branch BD is lower than that of Ant1, two radiation modes working at the resonant frequency f1 of the first branch BD can be excited to form differential mode homodromous current distribution, and the common mode homodromous current distribution M1 formed when the resonant frequency f2 of the second branch AB of Ant1 is higher than that of the resonant frequency f1 of the first branch BD of Ant1 is combined, so that when the Ant1 works at the resonant frequency f1 of the first branch BD, the excited multiple radiation modes are fused, and the radiation performance of the Ant1 can be improved.

In the second working mode, when the second end of the first branch BD is opened to the ground through the second matching network 3 and the first switch module 4, ant1 realizes LB frequency band coverage, the third connection point E is an LB antenna lower ground point, and the third sub-matching network 5 can be directly grounded or can be a metal structure suspension design requirement adopting a high-frequency grounding network to be compatible with SAR sensor design requirements. The BE part on the first radiator 10 serves as a low-frequency antenna radiation structure, and the switching of the low-frequency band is realized through the second matching network 3 and the first switch module 4 at the connection point D. The radiator portions at the first and second connection points G and H are short in length since they are outside the low frequency location E, and thus have less influence on the low frequency. In the case that the antenna module shown in fig. 2 is in the first or second operation mode, the S11 parameter curves of the Low intermediate frequency (Low mid Band) LMB antenna pair B8, B20, B28, B1, B3, and B41 bands implemented by the antenna module are shown in fig. 6.

It should be noted that, as D in fig. 6 is grounded, it means that the second end D of the first branch BD is directly grounded through the second matching network 3 and the first switch module 4, that is, the antenna module is in the first working mode; as shown in fig. 6, the second end D of the first branch BD is grounded, which means that the second end D of the first branch BD is opened to ground through the second matching network 3 and the first switch module 4, i.e. the antenna module is in the second operation mode.

Example two

The main differences between the antenna assembly shown in fig. 7 and the antenna assembly shown in fig. 2 include: the LB antenna sub-ground at the third connection point E is removed on the basis of the antenna assembly shown in fig. 2, and the sub-ground is passed through the target sub-matching network 11 and the second switch module 12 at the first connection point G and the second connection point H.

For the antenna assembly shown in fig. 7, it includes the following two modes of operation:

in the first working mode, when the second end of the first branch BD is directly grounded through the second matching network 3 and the first switch module 4, the Ant1 achieves MHB frequency band coverage, and when the antenna corresponding to the Ant1 works in different frequency bands, the resonance frequency of the third branch DJ is correspondingly tuned and switched through the target sub-matching network 11 and the second switch module 12 to enable the resonance frequency to be close to and lower than the resonance frequency of the first branch BD, so that the performance of each frequency band of the MHB of the Ant1 is optimized to the greatest extent.

In the second working mode, when the second end of the first branch BD is opened to the ground through the second matching network 3 and the first switch module 4, ant1 achieves LB frequency band coverage, and the second connection point H is used as a place under the LB antenna through the second switch module 12, so that the low-frequency radiating structure can BE used as a BE part on the first radiator 10, the part which maximally uses the first radiator 10 is used as the low-frequency antenna radiator, compared with the scheme shown in fig. 2, the length of the low-frequency antenna radiator is increased, the radiation performance of the low-frequency antenna is further improved, particularly as shown in fig. 9, by comparing the radiation efficiency when the antenna assembly is used as the place under the LB antenna through the third connection point E shown in fig. 2 with the radiation efficiency when the antenna assembly is used as the place under the LB antenna through the second connection point H shown in fig. 7, as the radiation performance of the LB antenna in the antenna assembly shown in fig. 7 is better.

As can be seen from the graph of the overall efficiency of the system shown in fig. 8, the radiation performance of the antenna assembly shown in fig. 7 for the B1 band and the B41 band is improved compared to the radiation performance of the antenna assembly shown in fig. 1 for the B1 band and the B41 band.

It should be noted that, as the ground connection of H in fig. 8, it means that the second connection point H is directly connected to the ground through the target sub-matching network 11 and the second switch module 12, that is, the antenna module is in the first working mode; as in H in fig. 8, the second connection point H is grounded, which means that the second connection point H is opened to ground through the target sub-matching network 11 and the second switch module 12, i.e. the antenna module is in the second operation mode.

In this embodiment of the present application, by adding the third branch DJ and tuning each radiation branch by using the tuning circuit 20 to excite multiple modes, the performance of the MHB antenna can be improved, and on the other hand, the added third branch DJ and the part of the multiplexed MHB radiator and the design of the LB antenna are realized, and meanwhile, the switching of the switch module and the tuning function of the tuning circuit 20 are combined, so that the multi-band switching of the MHB and the LB can be realized, and the multi-band radiation performance of the MHB and the LB can be improved.

The embodiment of the application also provides an electronic device, which may be a mobile terminal, for example: a mobile phone, a tablet computer, a wearable device, etc., are not particularly limited herein. The electronic device is equipped with an antenna assembly according to any of the embodiments shown in fig. 2 to 7.

Thus, by configuring any of the antenna assemblies shown in the embodiments of fig. 2 to 7 on the electronic device, the same radiator can be used to achieve coverage of multiple MHB and LB frequency bands, or to improve the radiation performance of the MHB antenna, or to improve the radiation performance of the LB antenna.

The MHB frequency band is used as a frequency band range of the mobile terminal, so that the MHB antenna design of the mobile terminal is of great importance, and not only is the antenna performance required in various use situations high, but also a plurality of MHB antennas are required on one mobile terminal to support the MIMO function. .

In the related art, because each application frequency band is independent of each other, the design of the antenna is generally split to correspondingly implement each application frequency band, i.e. the antenna is independently designed for each frequency band. However, the design space for the antennas on the electronic device is limited, and isolation between the antennas is a problem, so that the application scenario of the scheme is very limited.

The antenna assembly provided by the embodiment of the application can utilize the same antenna radiator to realize signal radiation of a plurality of frequency bands, and can also utilize the tuning circuit 20 to tune each branch of the antenna radiator, so that the radiation performance of the antenna can be improved.

In addition, because the radiator size that the LB antenna needs is longer, and the required layout space is great, in this application an optional implementation manner, can multiplexing the LB antenna radiator with the partial antenna radiator branch of MHB to be favorable to layout MHB antenna and LB antenna on the electronic equipment that antenna layout space is limited. Thus, when the service of the electronic device needs to implement the radiation functions of the multiple MHB and LB frequency bands, the size of the radiator for radiating the multiple MHB and LB frequency band signals can be reduced, thereby being beneficial to reducing the space size of the electronic device.

As an alternative embodiment, the electronic device further includes: a metal frame;

the metal bezel comprises the first radiator 10 and/or the second radiator 30 of the antenna assembly.

In one embodiment, the first radiator 10 and the second radiator 30 may be located on the same side of the metal bezel.

In one embodiment, the first radiator 10 and the second radiator 30 may be located at different sides of the metal bezel.

In this embodiment, the first radiator 10 and/or the second radiator 30 are formed by multiplexing the metal frame of the electronic device, so that the structural complexity and the spatial dimension of the electronic device can be reduced compared with the case where the first radiator 10 and/or the second radiator 30 are additionally arranged on the electronic device.

Optionally, as shown in fig. 2 or fig. 7, the electronic device includes a battery compartment area 100 and a main board area 200, and the metal frame is wound around the battery compartment area 100 and the main board area outside 200;

the first radiator 10 is disposed on a first side of the metal frame (e.g., a side of the metal frame located on an upper side as viewed in fig. 2 or 7), along which the battery compartment area 100 and the main board area 200 are distributed;

the orthographic projection of the target area of the first radiator 10 relative to the second side edge (e.g., the side edge of the metal frame located at the lower side in fig. 2 or 7) of the metal frame is located in the main board area 200, where the second side edge and the first side edge are opposite sides of the metal frame, and the target area of the first radiator 10 includes an area of the first radiator 10 located between the first feeding point C and the second break J of the first branch.

In one embodiment, the target region of the first radiator 10 is a region of the first radiator 10 between the first feed point C and the second break J of the first branch. In this way, since the circuit structures such as the first feed source 40, the tuning circuit 20, and the ground element are all used for connection with the target area of the first radiator 10, the circuit structures such as the first feed source 40, the tuning circuit 20, and the ground element can be disposed on the motherboard located in the motherboard area 200, so that the distance between the target area of the first radiator 10 and the circuit structures such as the first feed source 40, the tuning circuit 20, and the ground element can be reduced, and the length of the connection line between the target area of the first radiator 10 and the target area of the first radiator 10 can be further reduced, and the influence of the connection line length on the Ant1 antenna performance can be reduced.

In another embodiment, the target area of the first radiator 10 may include the entire area of the first radiator 10. In this way, the distance between the target area of the first radiator 10 and the circuit structures such as the first feed 40, the tuning circuit 20, and the ground element can be reduced, and the length of the connection line between the target areas of the first radiator 10 and the target area of the first radiator 10 can be further reduced, thereby reducing the influence of the connection line length on the Ant1 antenna performance. However, compared to a case where only the region of the first radiator 10 located between the first feeding point C and the second break J of the first branch is disposed near the main board region 200, the layout space of the first radiator 10 is limited.

In one embodiment, the second radiator 30 may be disposed in an area of the metal bezel surrounding the outside of the main board area 200. In this way, the length of the connection line between the second radiator 30 and the second feed 50 provided on the main board can be reduced as well, and the influence of the connection line length on the Ant2 antenna performance can be reduced.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. An antenna assembly, comprising: a first radiator and a tuning circuit;

the tuning circuit is respectively connected with the first branch and the third branch so as to adjust the resonant frequencies of the first branch and the third branch.

2. The antenna assembly of claim 1, wherein the tuning circuit is configured to cause the resonant frequency of the first branch to be greater than the resonant frequency of the third branch and less than the resonant frequency of the second branch.

3. The antenna assembly of claim 2, wherein the radiation pattern of the first radiator comprises a first radiation pattern and a second radiation pattern with the antenna assembly operating at the resonant frequency of the first branch;

the first radiation mode is a radiation mode for forming common mode homodromous current distribution on the first branch and the second branch;

the second radiation mode is a radiation mode of which differential mode homodromous current distribution is formed on the second branch and the third branch.

4. An antenna assembly according to any one of claims 1 to 3, wherein the tuning circuit comprises: the first matching network, the second matching network and the third matching network;

the first feed point is used for being connected with the first feed source through the first matching network, the second end of the first branch is grounded through the second matching network, and the second part of the third branch is connected with the third matching network;

the first feed point is positioned between the first end of the first branch and the second end of the first branch, and the second part is close to the second end of the third branch;

the first matching network, the second matching network and the third matching network are used for tuning the resonance frequency of the first branch and the resonance frequency of the third branch, so that the resonance frequency of the first branch is larger than the resonance frequency of the third branch and smaller than the resonance frequency of the second branch.

5. The antenna assembly of claim 4, wherein the second matching network comprises a matching branch and a first switching module:

the first switch module is connected between the matching branch and the grounding piece;

wherein, under the condition that the matching branch is grounded through the first switch module, the radiation signal of the antenna assembly comprises a middle-high band MHB signal;

and under the condition that the matching branch is disconnected and grounded through the first switch, the radiation signal of the antenna assembly comprises a low-frequency band LB signal, and the first branch and the third branch form an antenna radiation structure of LB.

6. The antenna assembly of claim 5, wherein the second portion includes first and second connection points spaced apart along a length of the third stub;

the third matching network includes: a first sub-matching network and a second sub-matching network;

the first connection point is grounded through the first sub-matching network, and the second connection point is grounded through the second sub-matching network.

7. The antenna assembly of claim 6, wherein a target sub-matching network comprises the first sub-matching network and the second sub-matching network, the antenna assembly further comprising:

the second switch module is connected between the target sub-matching network and the grounding piece;

the second switch module is used for grounding at least one of the first connection point and the second connection point through the target sub-matching network or disconnecting the first connection point and the second connection point from ground through the target sub-matching network.

8. The antenna assembly of claim 7, wherein in the case where the radiation signal of the antenna assembly is an LB signal, the first switch module is configured to disconnect the second end of the first branch from ground, and the second switch module is configured to ground the second connection point as an LB antenna lower point;

and under the condition that the radiation signal of the antenna assembly is an MHB signal, the first switch module is used for grounding the second end of the first branch, the second switch module and the target sub-matching network are used for adjusting the resonance frequency of the third branch so that the resonance frequency of the third branch is smaller than that of the first branch, and the difference value between the resonance frequency of the third branch and the resonance frequency of the third branch is smaller than a preset value.

9. The antenna assembly of claim 6, wherein the second portion further comprises: the third connecting point is arranged at intervals with the first connecting point and is positioned on one side, close to the first end of the third branch, of the first connecting point and the second connecting point;

the third matching network includes: a third sub-matching network;

the third connection point is grounded through the third sub-matching network.

10. The antenna assembly of claim 9, wherein the third sub-matching network comprises a high frequency ground network or a ground network.

11. The antenna assembly of claim 9, wherein in the case where the radiation signal of the antenna assembly is an LB signal, the first switch module is configured to disconnect the second end of the first branch from ground, and the first connection point is grounded through the third sub-matching network to serve as an LB antenna lower point;

and under the condition that the radiation signal of the antenna assembly is an MHB signal, the first switch module is used for grounding the second end of the first branch, the first sub-matching network and the second sub-matching network are used for adjusting the resonance frequency of the third branch so that the resonance frequency is smaller than that of the first branch, and the difference value between the first sub-matching network and the second sub-matching network is smaller than a preset value.

12. The antenna assembly of any one of claims 1 to 11, further comprising: a second radiator;

a second fracture is formed between the first end of the second radiator and the second end of the third branch, and a second feed point is arranged on the second radiator and used for being connected with a second feed source.

13. An electronic device comprising an antenna assembly as claimed in any one of claims 1 to 12.

14. The electronic device of claim 13, further comprising: a metal frame;

the metal bezel includes a first radiator and/or a second radiator of the antenna assembly.

15. The electronic device of claim 14, wherein the electronic device comprises a battery compartment area and a motherboard area, the metal bezel being disposed around the battery compartment area and the motherboard area;

the first radiator is arranged on the first side edge of the metal frame, and the battery compartment area and the main board area are distributed along the first side edge;

the target area of the first radiator is located in the main board area relative to the orthographic projection of the second side edge of the metal frame, wherein the second side edge and the first side edge are opposite sides of the metal frame, and the target area of the first radiator comprises an area, located between a first feed point and a second fracture, of the first radiator.