Antenna assembly and electronic device

Abstract

The application discloses an antenna assembly and an electronic device, and belongs to the technical field of communication. The antenna assembly comprises a first radiator and a tuning circuit. The first radiator comprises a first branch, a second branch and a third branch. A first break is arranged between the first end of the first branch and the first end of the second branch. 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 feeding point is arranged on the first branch, and the first feeding point is used for connecting a first feed source. The second end of the first branch is grounded. The tuning circuit is connected with the first branch and the third branch respectively, so as to adjust the resonant frequency of the first branch and the third branch.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to an antenna assembly and an electronic device. Background Technology

[0002] With the development of terminal products, mobile smart terminal devices, such as mobile phones, smartwatches, and wearable products, need to support more and more communication modules, such as 4G, 5G, Near Field Communication (NFC), Global Positioning System (GPS), Wireless Fidelity (WiFi), and Ultra Wide Band (UWB). This necessitates designing numerous antennas on the terminal, and ensuring that each antenna operates independently to meet the requirements of different communication scenarios. Consequently, a significant amount of space is required to house these antennas, hindering the reduction of terminal size. Summary of the Invention

[0003] The purpose of this application is to provide an antenna assembly and an electronic device that can support multiple frequency bands using a single antenna assembly, thereby reducing the space occupied by multi-band antennas and thus reducing the size of the electronic device equipped with the antenna assembly.

[0004] In a first aspect, embodiments of this application provide an antenna assembly, including: a first radiator and a tuning circuit;

[0005] The first radiator includes a first branch, a second branch, and a third branch. A first slit 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 to the first end of the third branch.

[0006] 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 provided on the first branch, and the first feed point is used to connect to the first feed source; the second end of the first branch is grounded.

[0007] The tuning circuit is connected to the first branch and the third branch respectively to adjust the resonant frequencies of the first branch and the third branch.

[0008] Secondly, embodiments of this application provide an electronic device including the antenna assembly as described in the first aspect.

[0009] In this embodiment, the antenna assembly includes: a first radiator and a tuning circuit; the first radiator includes a first stub, a second stub, and a third stub, a first gap is formed between the first end of the first stub and the first end of the second stub, and the second end of the first stub is connected to the first end of the third stub; a first portion of the second stub is grounded, and the first portion is close to the second end of the second stub; a first feed point is provided on the first stub, which is used to connect to a first feed source, and the second end of the first stub is grounded; the tuning circuit is connected to the first stub and the third stub respectively to adjust the resonant frequencies of the first stub and the third stub. By setting the radiator of the same antenna as three stubs, multiple radiation modes can be excited on the radiator by tuning each stub through the tuning circuit, so that the signal radiated by one radiator can cover multiple frequency bands, that is, multiple frequency bands can be supported by one antenna assembly, thereby reducing the space occupied by multi-band antennas. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the MHB antenna assembly on the side of a mobile phone in related technologies;

[0011] Figure 2 This is a schematic diagram of the structure of the first antenna assembly provided in the embodiments of this application;

[0012] Figure 3 Is it like this? Figure 2 A schematic diagram of the unidirectional current distribution excited by the antenna assembly shown.

[0013] Figure 4 Is it like this? Figure 2 The antenna assembly shown and as Figure 1 The graph shows the S-parameters of the MHB antenna assembly.

[0014] Figure 5 Is it like this? Figure 2 The antenna assembly shown and as Figure 1 The graph shows the system radiation efficiency and overall system efficiency of the MHB antenna assembly.

[0015] Figure 6 Is it like this? Figure 2 The diagram shows the S-parameter curves of the antenna assembly used as an LMB antenna.

[0016] Figure 7 This is a schematic diagram of the structure of the second antenna assembly provided in the embodiments of this application;

[0017] Figure 8 Is it like this? Figure 1 The antenna assembly shown and as Figure 7 The graph shows the overall system efficiency of the MHB antenna of the antenna assembly shown.

[0018] Figure 9 Is it like this? Figure 2 The antenna assembly shown and as Figure 7 The graph shows the radiation efficiency of the LB antenna of the antenna assembly shown. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] In related technologies, with the development of terminal products, mobile smart terminal devices, such as mobile phones, smartwatches, and wearable products, need to support more and more communication modules, such as 4G, 5G, Near Field Communication (NFC), Global Positioning System (GPS), Wireless Fidelity (WiFi), and Ultra Wide Band (UWB).

[0022] Among them, the Middle High Band (MHB) frequency band (1710MHz to 2700MHz) is mainly used in 4G and 5G communications. As the most widely used frequency band for terminal products, the design of MHB antennas for terminal products is crucial. Not only are the antenna performance requirements high in various usage scenarios, but a single device often requires multiple MHB antennas to support the Multi-Input Multi-Output (MIMO) function.

[0023] The antenna assembly provided in this application embodiment can use a single radiator to cover multiple MHB bands and / or low-band (LB) bands, which reduces the layout space of the antenna assembly compared to the related art which uses antennas for multiple MHB bands and / or low-band (LB) bands separately.

[0024] For example: Figure 1 As shown, the MHB antenna in the related technology includes: a radiator 101, a feed 102, and a tuning circuit 103; wherein, the radiator 101 includes two spaced-apart stubs, namely stub A'B' and stub B'D';

[0025] In this configuration, the end of spur A'B' furthest from spur B'D' is grounded, the end of spur B'D furthest from spur A'B' is grounded, and part C' of spur B'D' is connected to feed 102 via tuning circuit 103. Thus, the resonant frequency of spur B'D can be tuned via tuning circuit 103.

[0026] And such Figure 2 As shown, in the antenna assembly provided in this application embodiment, the first radiator 10 includes three branches, that is, compared to Figure 1 In the case of the radiator 101 shown, a third stub DJ is added at the end of stub B'D' that is away from stub A'B'. In this way, the effective radiation area of ​​the antenna radiator can be increased by the third stub DJ, and the coverage frequency band of the antenna radiator can be increased, so that one radiator can cover more frequency bands, avoiding the need to set at least two radiators to cover these frequency bands.

[0027] The antenna components and electronic devices provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0028] like Figure 2 As shown, the first antenna assembly provided in this application embodiment may include: a first radiator 10 and a tuning circuit 20.

[0029] The first radiator 10 includes a first branch BD, a second branch AB and a third branch DJ. The first end of the first branch BD and the first end of the second branch AB have a first slit B. The second end of the first branch BD is connected to the first end of the third branch DJ.

[0030] 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 feed point C is provided on the first branch BD, and the first feed point C is used to connect the first feed source 40; the second end D of the first branch BD is grounded.

[0031] The tuning circuit 20 is connected to the first branch BD and the third branch DJ respectively to adjust the resonant frequencies of the first branch BD and the third branch DJ.

[0032] The fact that the first part A is close to the second end of the second branch AB can be understood as: the distance between the first part A and the second end of the second branch AB is less than the distance between the first part A and the first end of the second branch AB.

[0033] like Figures 2 to 7 In the illustrated embodiment, the example is that the first branch BD, the second branch AB, and the third branch DJ are located on the same straight line. In other embodiments, the first branch BD, the second branch AB, and the third branch DJ may also be located on different straight lines. For example, the first branch BD, the second branch AB, and the third branch DJ may be distributed on adjacent sides of the metal frame. This does not constitute a specific limitation.

[0034] In one embodiment, the second stub AB can be regarded as a port parasitic structure of the first antenna (Ant1) corresponding to the first feed 40, and its length can be about 13.5mm.

[0035] In one embodiment, the tuning circuit 20 may include an impedance matching network, a grounding network, etc., such as Figure 1 In the illustrated embodiment, the tuning circuit 20 includes a first matching network 1 connected between the first feed point C of the first stub BD and the first feed source 40, a second matching network 3 connected between the second end D of the first stub BD and the ground end, and a third matching network connected between the third stub DJ and the ground end for illustrative purposes.

[0036] Optionally, such as Figure 1 As shown, the tuning circuit 20 includes: a first matching network 1, a second matching network 3, and a third matching network;

[0037] The first feed point C is used to connect to 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 to the third matching network.

[0038] The first feed 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 part is close to the second end of the third branch DJ.

[0039] Among them, the first matching network 1, the second matching network 3 and the third matching network are used to tune the resonant frequencies 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 less than the resonant frequency f2 of the second branch.

[0040] In one embodiment, the second part may include at least one connection point, and each connection point may be grounded through a third matching network.

[0041] Optionally, such as Figure 2 As shown, the second part 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;

[0042] The third matching network includes: a first sub-matching network 6 and a second sub-matching network 7;

[0043] The first connection point G is grounded through the first sub-matching network 6, and the second connection point H is grounded through the second sub-matching network 7.

[0044] In one implementation, such as Figure 2 As shown, the first sub-matching network 6 and the second sub-matching network 7 can be two independent sub-matching networks to implement their respective tuning functions.

[0045] In another implementation, such as Figure 7 As shown, the target sub-matching network 11 includes a first sub-matching network and a second sub-matching network, and the antenna assembly further includes:

[0046] The second switch module 12 is connected between the target sub-matching network 11 and the grounding component;

[0047] The second switch module 12 is used to ground at least one of the first connection point G and the second connection point H through the target sub-matching network 11, or to disconnect the grounding of the first connection point G and the second connection point H through the target sub-matching network 11.

[0048] In this embodiment, the first sub-matching network 6 and the second sub-matching network 7 can share a target sub-matching network 11. By setting a second switching module 12 between the target sub-matching network 11 and the ground, tuning can be achieved by controlling the switching state of the second switching module 12, thereby realizing multi-band switching and improving multi-band radiation performance.

[0049] As an optional implementation, the second matching network 3 provided in this application embodiment includes a matching branch and a first switching module 4:

[0050] The first switch module 4 is connected between the matching branch and the grounding component;

[0051] Wherein, when the matching branch is grounded through the first switch module 4, the radiated signal of the antenna assembly includes mid-to-high frequency band MHB signal;

[0052] When the matching branch is disconnected from ground through the first switch module 4, the radiated signal of the antenna assembly includes the low-frequency band LB signal, and the first stub BD and the third stub DJ constitute the antenna radiation structure of LB.

[0053] It is worth noting that the second matching network 3 may include one or at least two matching branches. If the second matching network 3 includes at least two matching branches, the impedance values ​​of the at least two matching branches may be different. In this case, the matching branches are grounded through the first switch module 4, which means that the first switch module 4 directly connects at least a portion of the matching branches to ground; the matching branches are disconnected from grounding through the first switch module 4, which means that the first switch module 4 disconnects all matching branches in the second matching network 3 from grounding.

[0054] In this embodiment, the first switch module 4 can realize the switching of MHB and LB multi-band.

[0055] In one implementation, such as Figure 2 As shown, the second part further includes: a third connection point E, which is spaced apart from the first connection point G and located on the side of the first connection point G and the second connection point H near the first end D of the third branch DJ.

[0056] The third matching network includes: the third sub-matching network 5;

[0057] The third connection point E is grounded through the third sub-matching network 5.

[0058] In one embodiment, the third sub-matching network 5 includes a high-frequency grounding network or a grounding network.

[0059] Among them, when the third sub-matching network 5 includes a high-frequency grounding network, it can be compatible with the metal structure suspension design requirements of SAR sensor design.

[0060] In one embodiment, when the radiated signal of the antenna assembly includes a mid-to-high frequency band MHB signal, i.e., when the first switch module 4 grounds the second terminal D of the first stub BD, the third connection point E can be used as the lower point of the MHB antenna.

[0061] In one embodiment, when the radiated signal of the antenna assembly includes the LB signal, i.e., when the first switch module 4 grounds the second terminal D of the first stub BD, the third connection point E can be used as the lower point of the LB antenna. In this case, the antenna radiation structure of the LB consisting of the first stub BD and the third stub DJ can be the entire first stub BD and the part DE of the third stub DJ located to the left of the third connection point E together constitute the antenna radiation structure of the LB.

[0062] In another implementation, such as Figure 7As shown, in Figure 2 Based on the antenna assembly shown, the third connection point E is removed. When the radiated 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, serving as the lower point of the LB antenna. In this case, the antenna radiation structure of the LB formed by the first stub BD and the third stub DJ can be the entire first stub BD and the portion DH of the third stub DJ located to the left of the second connection point H, together constituting the antenna radiation structure of the LB. Compared to... Figure 2 Regarding the LB antenna radiation structure BE in the antenna assembly shown, as... Figure 7 The LB antenna radiation structure BH in the antenna assembly shown maximizes the use of the antenna structure as a low-frequency antenna radiation, making the low-frequency antenna radiation structure longer and improving the radiation performance of the low-frequency antenna.

[0063] In this embodiment, the first matching network 1 and the second matching network 3 can be used to tune the first stub BD, and the third matching network can be used to tune the third stub DJ, so as to achieve that the resonant frequency f1 of the first stub BD is greater than the resonant frequency f3 of the third stub DJ and less than the resonant frequency f2 of the second stub AB. The operating frequency of the antenna assembly includes the resonant frequency f1 of the first stub.

[0064] By making the resonant frequency f1 of the first stub BD less than the resonant frequency f2 of the second stub AB, the first radiation mode excited by the first stub BD and the second stub AB operating at the resonant frequency f1 of the first stub can be made to have a common-mode current distribution.

[0065] 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 at the resonant frequency f1 of the first branch can be distributed in the same direction with differential mode current.

[0066] Thus, by combining the first radiation mode with a common-mode unidirectional current distribution and the second radiation mode with a differential-mode unidirectional current distribution, multiple excitation radiation modes can be fused. That is, when the antenna assembly operates at the resonant frequency of the first stub, the radiation modes of the first radiator include the first radiation mode and the second radiation mode. At this time, the entire first radiator 10 exhibits a unidirectional current distribution, and the current path M2 of this unidirectional current distribution can be as follows: Figure 3 As shown.

[0067] like Figure 4 and Figure 5 As shown, when the antenna assembly provided in this embodiment is used to radiate MHB signals, its antenna performance is comparable to that of... Figure 1The S-parameters and system radiation efficiency of the MHB antenna in the related technologies shown have been improved.

[0068] Specifically, such as Figure 4 The graph showing the input reflection coefficient S11, i.e., the input return loss parameter, indicates that the solid line represents the S-parameter curve of the antenna assembly provided in this embodiment when radiating MHB signals, and the dashed line represents the curve of the antenna assembly when radiating MHB signals. Figure 1 The S-parameter curves of the MHB antenna in the related art are shown. It can be seen that the antenna assembly provided in this application embodiment is superior to that shown in the example. Figure 1 Regarding the MHB antenna in the related technology shown, the coverage frequency band f3 of the MHB antenna is increased, and the antenna return loss can be reduced, thereby improving the antenna radiation performance.

[0069] like Figure 5 In the curves showing the system's radiation efficiency and overall system efficiency, assuming... Figure 1 In the related technology shown, the radiation modes excited on stubs A'B' and B'D' of the MHB antenna exhibit a common-mode unidirectional current distribution, and the current path of this common-mode unidirectional current distribution is as follows: Figure 1 M1 is shown in the image. Figure 5 As can be seen, taking the antenna radiated signal in the B3 frequency band as an example, such as Figure 2 The M2 current distribution in the illustrated embodiment is different from that in the example shown. Figure 1 As shown in the M1 common-mode unidirectional current distribution, it can improve the radiation efficiency of the antenna assembly when used as an MHB antenna.

[0070] It should be noted that, as Figure 4 and Figure 5 In the middle, assuming as Figure 1 In the related technology shown, the stub A'B' of the MHB antenna acts as a parasitic structure with a break. Its resonant frequency is higher than that of the main branch structure of stub B'D, thereby exciting the common-mode current distribution M1' of the two radiation modes 'AB' and 'BD' operating at the resonant frequency of the main branch. This mode is the radiation mode of the antenna operating frequency.

[0071] In addition, the tuning circuit 20 in the embodiments of this application, besides as shown in the example... Figure 2 In addition to the first matching network 1 connected between the first feed point C and the first feed source 40 of the first branch BD, the second matching network 3 connected between the second end D of the first branch BD and the ground end, and the third matching network connected between the third branch DJ and the ground end, the tuning circuit 20 may also be connected to the first branch BD and the third branch DJ in other ways. For example, a switching module may be provided between the tuning circuit 20 and the ground end to utilize the switching module to condition the equivalent capacitance and / or equivalent resistance of the tuning circuit 20, etc., which is not specifically limited here.

[0072] In one alternative implementation, such as Figure 1 As shown, the third matching network can be further divided into: the third sub-matching network 5, the first sub-matching network 6, and the second sub-matching network 7.

[0073] In one embodiment, the third connection point E on the third branch DJ connected to the third sub-matching network 5 can be used as the antenna ground point. The third sub-matching network 5 can be directly connected to the ground or a high-frequency grounding network can be used. The high-frequency grounding network may include, but is not limited to, capacitors. By setting the high-frequency grounding network, the metal structure suspension design required by the Specific Absorption Ratio (SAR) sensing design can be compatible.

[0074] In one embodiment, the first sub-matching network 6 and the second sub-matching network 7 have similar structures. Specifically, the first sub-matching network 6 and / or the second sub-matching network 7 may include, but are not limited to, capacitors, inductors, and parallel / series inductance capacitors (LC). Alternatively, the first sub-matching network 6 and / or the second sub-matching network 7 may be open to ground to meet the requirements of SAR sensor design compatibility, or the first sub-matching network 6 and / or the second sub-matching network 7 may be directly connected to ground.

[0075] In this embodiment, when the antenna assembly radiates a signal, the first sub-matching network 6 and / or the second sub-matching network 7 can tune the resonant frequency on the third stub DJ based on the equivalent capacitance or inductance.

[0076] Optionally, such as Figure 1 As shown, the antenna assembly provided in this embodiment of the application further includes: a second radiator 30;

[0077] There is a second gap J between the first end of the second radiator 30 and the second end of the third branch DJ. The second radiator 30 has a second feed point, which is used to connect the second feed source 50.

[0078] In this embodiment, the first sub-matching network 6 and the second sub-matching network 7 can be considered as direct grounding for the second antenna (Ant2) corresponding to the second feed 50. That is, the first connection point G of the first sub-matching network 6 and the second connection point H of the second sub-matching network 7 can be used as the antenna grounding point of the second radiator 30. By setting the first connection point G and the second connection point H as grounding points, the reliability of the antenna grounding of Ant2 can be improved, and the probability of Ant2's performance being affected by unreliable grounding at one point can be reduced.

[0079] To facilitate understanding of the antenna assembly provided in the embodiments of this application, the working principle of the antenna assembly provided in the embodiments of this application will be illustrated by the following example:

[0080] Example 1

[0081] For example Figure 2 The antenna assembly shown includes the following two operating modes:

[0082] In working mode 1, when the second end of the first branch BD is directly connected to the ground through the second matching network 3 and the first switch module 4, Ant1 achieves MHB band coverage. The third connection point E is the antenna grounding point. The third sub-matching network 5 can be a directly grounded grounding network or a high-frequency grounding network to meet the metal structure suspension design requirements of the SAR sensor design. The first connection point G and the second connection point H are used to load the first sub-matching network 6 and the second sub-matching network 7, respectively. In this way, when the first radiator 10 is used to radiate MHB band signals, the first sub-matching network 6 and the second sub-matching network 7 can tune the resonant frequency of the third branch DJ of Ant1 based on the equivalent capacitance or inductance. For the high-frequency antenna Ant2 on the right side of the gap J, the first sub-matching network 6 and the second sub-matching network 7 are equivalently directly connected to the ground.

[0083] By tuning the resonant frequency f3 of the third branch DJ of Ant1 to be lower than the resonant frequency f1 of the first branch BD of Ant1, the two radiation modes operating at the resonant frequency f1 of the first branch BD can be excited to have a differential mode current distribution in the same direction. Combined with the common mode current distribution M1 formed when the resonant frequency f2 of the second branch AB of Ant1 is higher than the resonant frequency f1 of the first branch BD of Ant1, when Ant1 is operating at the resonant frequency f1 of the first branch BD, the multiple radiation modes excited are merged, which can improve the radiation performance of Ant1.

[0084] In operating mode two, when the second end of the first branch BD is open-circuited to ground through the second matching network 3 and the first switching module 4, Ant1 achieves LB band coverage. The third connection point E is the LB antenna ground point. The third sub-matching network 5 can be directly grounded or use a high-frequency grounding network to accommodate the metal structure suspension design requirements of the SAR sensor design. The BE portion on the first radiator 10 serves as the low-frequency antenna radiating structure, and low-frequency band switching is achieved through the second matching network 3 and the first switching module 4 at connection point D. The radiator portions at the first connection point G and the second connection point H have less impact on low frequencies because they are outside the low-frequency ground point E and have a short structural length. Figure 2When the antenna module shown is in either operating mode one or operating mode two, the S11 parameter curves of the low-intermediate band (LMB) antenna implemented by the antenna module for the B8, B20, B28, B1, B3, and B41 frequency bands are as follows: Figure 6 As shown in the image.

[0085] It should be noted that, as Figure 6 In the diagram, D being grounded indicates that the second terminal D of the first stub BD is directly connected to ground through the second matching network 3 and the first switch module 4, meaning the antenna module is in the first operating mode; for example... Figure 6 The fact that D in the first branch BD is disconnected from ground indicates that the second terminal D of the first branch BD is open to ground through the second matching network 3 and the first switch module 4, meaning that the antenna module is in the second working mode.

[0086] Example 2

[0087] like Figure 7 The antenna assembly shown is similar to... Figure 2 The main differences between the antenna assemblies shown include: in, for example Figure 2 Based on the antenna assembly shown, the LB antenna grounding point at the third connection point E is removed, and the grounding point is achieved 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.

[0088] For example Figure 7 The antenna assembly shown includes the following two operating modes:

[0089] In working mode 1, when the second end of the first branch BD is directly connected to the ground through the second matching network 3 and the first switch module 4, Ant1 achieves MHB band coverage. When the antenna corresponding to Ant1 is working in different frequency bands, the resonant frequency of the third branch DJ is tuned and switched through the target sub-matching network 11 and the second switch module 12 to make it close to and lower than the resonant frequency of the first branch BD, so as to optimize the performance of Ant1 in each MHB band to the greatest extent.

[0090] In operating mode two, when the second end of the first branch BD is open-circuited to ground through the second matching network 3 and the first switch module 4, Ant1 achieves LB band coverage. The second connection point H is grounded through the second switch module 12 as the LB antenna ground point. This allows the low-frequency radiation structure to be the BE portion of the first radiator 10, maximizing the utilization of a portion of the first radiator 10 as a low-frequency antenna radiator. Figure 2 The scheme shown increases the length of the low-frequency antenna radiator, further improving the radiation performance of the low-frequency antenna, specifically as follows: Figure 9 As shown, by comparison, Figure 2 The radiation efficiency of the antenna assembly shown, with the third connection point E as the location of the LB antenna, is as follows: Figure 7 The radiation efficiency of the antenna assembly shown, with the second connection point H as the location of the LB antenna, can be obtained as follows: Figure 7 The LB antenna in the antenna assembly shown has better radiation performance.

[0091] like Figure 8 As shown in the curve of the overall system efficiency, as can be seen, Figure 7 The antenna assembly shown has better radiation performance in the B1 and B41 bands compared to... Figure 1 The antenna assembly shown improves the radiation performance of the B1 and B41 bands.

[0092] It should be noted that, as Figure 8 In the context of H being grounded, it indicates that the second connection point H is directly connected to ground through the target sub-matching network 11 and the second switch module 12, meaning the antenna module is in the first operating mode; for example... Figure 8 The H in the diagram is grounded, indicating that the second connection point H is open to ground through the target sub-matching network 11 and the second switch module 12, meaning that the antenna module is in the second working mode.

[0093] In this embodiment, by adding a third stub DJ and using the tuning circuit 20 to tune each radiating stub to excite multiple modes, the performance of the MHB antenna can be improved. On the other hand, the added third stub DJ and the reused portion of the MHB radiator, as well as the design of the LB antenna, combined with the switching of the switching module and the tuning function of the tuning circuit 20, can realize multi-band switching of MHB and LB, and improve the multi-band radiation performance of MHB and LB.

[0094] This application also provides an electronic device, which can be a mobile terminal, such as a mobile phone, tablet computer, wearable device, etc., and is not specifically limited thereto. The electronic device is equipped with, for example, a mobile terminal, a mobile phone, a tablet computer, a wearable device, etc. Figures 2 to 7 Any of the antenna components shown in the embodiments.

[0095] Thus, by configuring such on electronic devices Figures 2 to 7 Any of the antenna components in the illustrated embodiments can achieve coverage of multiple MHB and LB frequency bands using the same radiator, or improve the radiation performance of the MHB antenna, or improve the radiation performance of the LB antenna.

[0096] Among them, the MHB band is the most widely used frequency band for mobile terminals. Therefore, the design of MHB antennas in mobile terminals is crucial. Not only are high antenna performance requirements high across various usage scenarios, but a single mobile terminal often requires multiple MHB antennas to support MIMO functionality.

[0097] In related technologies, because the frequency bands used in different applications are independent, antennas are typically designed separately to address each application band, meaning antennas are designed independently for each band. However, the design space for antennas on electronic devices is limited, and there are isolation issues between antennas. Therefore, the application scenarios for this approach are very limited.

[0098] The antenna assembly provided in this application embodiment can achieve signal radiation in multiple frequency bands using the same antenna radiator, and can also use the tuning circuit 20 to tune each branch of the antenna radiator, thereby improving the antenna's radiation performance.

[0099] Furthermore, since LB antennas require a relatively long radiator size and a large layout space, in one optional embodiment of this application, the LB antenna radiator can be reused with a portion of the MHB antenna radiator stubs. This facilitates the placement of MHB and LB antennas on electronic devices with limited antenna layout space. Thus, when the electronic device's services require radiation functionality across multiple MHB and LB frequency bands, the size of the radiator used to radiate signals from these multiple MHB and LB frequency bands can be reduced, thereby helping to reduce the spatial size of the electronic device.

[0100] As an optional implementation, the electronic device further includes: a metal frame;

[0101] The metal frame includes a first radiator 10 and / or a second radiator 30 of the antenna assembly.

[0102] In one embodiment, the first radiator 10 and the second radiator 30 may be located on the same side of the metal frame.

[0103] In one embodiment, the first radiator 10 and the second radiator 30 may be located on different sides of the metal frame.

[0104] In this embodiment, the first radiator 10 and / or the second radiator 30 are constructed by reusing the metal frame of the electronic device. Compared with additionally setting the first radiator 10 and / or the second radiator 30 on the electronic device, the structural complexity and spatial size of the electronic device can be reduced.

[0105] Optionally, such as Figure 2 or Figure 7 As shown, the electronic device includes a battery compartment area 100 and a motherboard area 200, and the metal frame is disposed around the outside of the battery compartment area 100 and the motherboard area 200.

[0106] The first radiator 10 is disposed on the first side of the metal frame (e.g., the metal frame is located at the first side of the metal frame). Figure 2 or Figure 7The battery compartment area 100 and the motherboard area 200 are distributed along the upper side of the first side.

[0107] The target area of ​​the first radiator 10 relative to the second side of the metal frame (e.g., the metal frame is located at...) Figure 2 or Figure 7 The orthographic projection of the lower side of the first radiator 10 is located within the motherboard region 200, wherein the second side and the first side are the opposite sides of the metal frame, and the target region of the first radiator 10 includes the region of the first radiator 10 located between the first feed point C of the first branch and the second break J.

[0108] In one embodiment, the target area of ​​the first radiator 10 is the region of the first radiator 10 located between the first feed point C and the second gap J of the first stub. Since the first feed 40, tuning circuit 20, grounding device, and other circuit structures are all used to connect to the target area of ​​the first radiator 10, these circuit structures can be placed on the mainboard located within the mainboard area 200. This reduces the distance between the target area of ​​the first radiator 10 and the circuit structures, thereby shortening the length of the connection lines between the target areas of the first radiator 10 and the target areas of the first radiator 10, reducing the impact of the connection line length on the performance of the Ant1 antenna.

[0109] In another embodiment, the target area of ​​the first radiator 10 may include the entire area of ​​the first radiator 10. This reduces the distance between the target area of ​​the first radiator 10 and circuit structures such as the first feed 40, tuning circuit 20, and grounding device, thereby shortening the length of the connecting lines between the target areas of the first radiator 10 and reducing the impact of the connecting line length on the Ant1 antenna performance. However, compared to a scheme where only the area of ​​the first radiator 10 located between the first feed point C and the second gap J of the first stub is placed near the mainboard area 200, this limits the layout space of the first radiator 10.

[0110] In one embodiment, the second radiator 30 can also be disposed in the region surrounding the mainboard area 200 of the metal frame. This also shortens the length of the connection line between the second radiator 30 and the second feed source 50 disposed on the mainboard, reducing the impact of the connection line length on the Ant2 antenna performance.

[0111] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An antenna assembly, characterized in that, include: First radiator and tuning circuit; The first radiator includes a first branch, a second branch, and a third branch. A first slit 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 to 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 provided on the first branch, and the first feed point is used to connect to the first feed source; the second end of the first branch is grounded. The tuning circuit is connected to the first stub and the third stub respectively to adjust the resonant frequency of the first stub and the third stub; The tuning circuit includes: a first matching network, a second matching network, and a third matching network; The first feed point is used to connect to 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 to the third matching network; The first feed point is located 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 to tune the resonant frequencies of the first branch and the third branch so that the resonant frequency of the first branch is greater than the resonant frequency of the third branch and less than the resonant frequency of the second branch. Wherein, when the antenna assembly operates at the resonant frequency of the first stub, the radiation mode of the first radiator includes a first radiation mode and a second radiation mode. The first radiation mode is a radiation mode in which a common-mode unidirectional current distribution is formed on the first stub and the second stub; The second radiation mode is a radiation mode in which a differential mode unidirectional current distribution is formed on the second branch and the third branch.

2. The antenna assembly according to claim 1, characterized in that, The second matching network includes a matching branch and a first switching module: The first switch module is connected between the matching branch and the grounding component; Wherein, when the matching branch is grounded through the first switching module, the radiated signal of the antenna assembly includes a mid-to-high frequency band MHB signal; When the matching branch is disconnected from ground through the first switch module, the radiated signal of the antenna assembly includes a low-frequency band (LB) signal, and the first stub and the third stub constitute the antenna radiation structure of the LB.

3. The antenna assembly according to claim 2, characterized in that, The second part includes a first connection point and a second connection point that are spaced apart along the length direction of the third branch; 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.

4. The antenna assembly according to claim 3, characterized in that, The target sub-matching network includes the first sub-matching network and the second sub-matching network, and the antenna assembly further includes: A second switching module is connected between the target sub-matching network and the grounding element; The second switch module is used to ground at least one of the first connection point and the second connection point through the target sub-matching network, or to disconnect the first connection point and the second connection point from the ground through the target sub-matching network.

5. The antenna assembly according to claim 4, characterized in that, When the radiated signal of the antenna assembly is an LB signal, the first switch module is used to disconnect the second end of the first stub from ground, and the second switch module is used to ground the second connection point as the LB antenna lower point; When the radiated signal of the antenna assembly is an MHB signal, the first switching module is used to ground the second end of the first stub, and the second switching module and the target sub-matching network are used to adjust the resonant frequency of the third stub so that the resonant frequency of the third stub is less than the resonant frequency of the first stub.

6. The antenna assembly according to claim 3, characterized in that, The second part further includes: a third connection point, which is spaced apart from the first connection point and located on the side of the first connection point and the second connection point near the first end of the third branch; The third matching network includes: a third sub-matching network; The third connection point is grounded through the third sub-matching network.

7. The antenna assembly according to claim 6, characterized in that, The third sub-matching network includes a high-frequency grounding network or a grounding network.

8. The antenna assembly according to claim 6, characterized in that, When the radiated signal of the antenna assembly is an LB signal, the first switch module is used to disconnect the second end of the first stub from ground, and the third connection point is grounded through the third sub-matching network as the LB antenna under point; When the radiated signal of the antenna assembly is an MHB signal, the first switching module is used to ground the second end of the first stub, and the first sub-matching network and the second sub-matching network are used to adjust the resonant frequency of the third stub.

9. The antenna assembly according to any one of claims 1 to 8, characterized in that, Also includes: Second radiator; The second radiator has a second gap between the first end of the second radiator and the second end of the third branch, and the second radiator has a second feed point for connecting the second feed source.

10. An electronic device, characterized in that, Includes the antenna assembly as described in any one of claims 1 to 9.

11. The electronic device according to claim 10, characterized in that, Also includes: Metal frame; The metal frame includes a first radiator and / or a second radiator of the antenna assembly.

12. The electronic device according to claim 11, characterized in that, The electronic device includes a battery compartment area and a motherboard area, and the metal frame is disposed around the outside of the battery compartment area and the motherboard area; The first radiator is disposed on the first side of the metal frame, and the battery compartment area and the motherboard area are distributed along the first side; The orthographic projection of the target area of ​​the first radiator relative to the second side of the metal frame is located within the motherboard area, wherein the second side and the first side are opposite sides of the metal frame, and the target area of ​​the first radiator includes the area of ​​the first radiator located between the first feed point and the second gap.

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