Antenna assembly and electronic equipment

Abstract

The invention provides an antenna assembly and electronic equipment. The antenna assembly comprises a first radiator and a first feed source. The first radiator comprises a first grounding end, a first feeding point and a first free end which are arranged in sequence; the first feed source is used for generating a first radio frequency signal and a second radio frequency signal, and the first feed source is electrically connected to the first feeding point; when the antenna assembly is in a free state, the first radio frequency signal is used for exciting the first radiator to support a first frequency band, the second radio frequency signal is used for exciting the first radiator to support a second frequency band, and the frequency of the second frequency band is smaller than that of the first frequency band; and when the electronic equipment applied by the antenna assembly is sleeved with a metal protective shell, the second radio frequency signal excites the first radiator to support at least part of the first frequency band. The electronic equipment applied to the antenna assembly provided by the invention still has relatively good antenna performance in the first frequency band when the electronic equipment is sleeved with the metal protective shell.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to an antenna assembly and electronic device. Background Technology

[0002] With technological advancements, mobile phones and other electronic devices with communication capabilities are becoming increasingly widespread and powerful. These devices typically include antenna components to enable their communication functions. However, when electronic devices are encased in a metal protective shell, the performance of the antenna components suffers significant attenuation in the target frequency band (such as the GPS L1 band), resulting in poor antenna performance in that band. Summary of the Invention

[0003] In a first aspect, one embodiment of this application provides an antenna assembly, the antenna assembly comprising:

[0004] A first radiator, comprising a first grounding terminal, a first feed point, and a first free end sequentially disposed therefrom; and

[0005] A first feed source, which is used to generate a first radio frequency signal and a second radio frequency signal, and the first feed source is electrically connected to the first feed point;

[0006] When the antenna assembly is in a free state: the first radio frequency signal is used to excite the first radiator to support the first frequency band, and the second radio frequency signal is used to excite the first radiator to support the second frequency band, wherein the frequency of the second frequency band is less than the frequency of the first frequency band;

[0007] When the electronic device to which the antenna assembly is applied is covered with a metal protective casing, the second radio frequency signal excites the first radiator to support at least a portion of the first frequency band.

[0008] Secondly, one embodiment of this application provides an electronic device, which includes an antenna assembly as described in the first aspect.

[0009] In summary, the antenna assembly provided in this application uses a first feed source to generate a first radio frequency (RF) signal and a second RF signal. The first feed source is electrically connected to a first feed point of the first radiator. Therefore, the first RF signal and the second RF signal are combined to excite the same first radiator, enabling the first radiator to support both a first and a second frequency band. Compared to when the antenna assembly is in a free state, when the electronic device to which the antenna assembly is applied has a metal protective casing, the frequency band supported by the first radiator excited by the second RF signal is frequency-biased relative to the second frequency band due to the influence of the metal protective casing. When the electronic device to which the antenna assembly is applied has a metal protective casing, the frequency band supported by the first radiator excited by the second RF signal shifts to a higher frequency relative to the second frequency band, thereby causing at least a portion of the frequency band supported by the first radiator excited by the second RF signal to fall within the range of the first frequency band. Therefore, when the electronic device to which the antenna assembly is applied is covered with a metal protective shell, the second radio frequency signal excites the first radiator to support at least a portion of the first frequency band, so that when the electronic device to which the antenna assembly is applied is covered with a metal protective shell, the antenna assembly still has a large bandwidth in the first frequency band, and the electronic device to which the antenna assembly is applied is covered with a metal protective shell, so that the electronic device to which the antenna assembly is applied still has good antenna performance in the first frequency band. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A schematic diagram of an antenna assembly provided according to one embodiment of this application;

[0012] Figure 2 for Figure 1 A schematic diagram of the resonant current corresponding to the first resonant mode of the antenna assembly shown.

[0013] Figure 3 for Figure 1 A schematic diagram of the resonant current corresponding to the second resonant mode of the antenna assembly shown;

[0014] Figure 4 A schematic diagram of an antenna assembly provided for another embodiment of this application;

[0015] Figure 5 A schematic diagram of an antenna assembly provided for yet another embodiment of this application;

[0016] Figure 6 for Figure 5 The diagram shows the resonant current corresponding to the antenna assembly supporting the third frequency band.

[0017] Figure 7 for Figure 5 The diagram shows the resonant current corresponding to the antenna assembly supporting the fourth frequency band.

[0018] Figure 8 for Figure 5 A schematic diagram of the first bandpass circuit of the antenna assembly shown;

[0019] Figure 9 A schematic diagram of an antenna assembly provided for yet another embodiment of this application;

[0020] Figure 10 for Figure 9 A schematic diagram of the second bandpass circuit shown;

[0021] Figure 11 A schematic diagram of an antenna assembly provided in another embodiment of this application;

[0022] Figure 12 for Figure 11 A schematic diagram of the first impedance matching circuit of the antenna assembly shown.

[0023] Figure 13 A schematic diagram of an antenna assembly provided in another embodiment of this application;

[0024] Figure 14 for Figure 13 A circuit diagram of a portion of the structure in the antenna assembly shown;

[0025] Figure 15 A schematic diagram of an antenna assembly provided for yet another embodiment of this application;

[0026] Figure 16 for Figure 15 A schematic diagram of the resonant currents corresponding to the first resonant mode and the second enhancement mode in the antenna assembly shown;

[0027] Figure 17 for Figure 15 A schematic diagram of the resonant currents corresponding to the third resonant mode and the third enhancement mode in the antenna assembly shown;

[0028] Figure 18 A schematic diagram of an antenna assembly provided for another embodiment of this application;

[0029] Figure 19 for Figure 18 A schematic diagram of the structure of some components in the antenna assembly shown;

[0030] Figure 20A comparison diagram of attenuation of the antenna assembly provided in one embodiment of this application in the first frequency band and the second frequency band when the electronic device in which it is applied is covered with a metal protective shell in free space.

[0031] Figure 21 Smith charts for the first and second frequency bands when the antenna assembly provided in the embodiments of this application is in a free state and when the applied electronic device is covered with a metal protective shell.

[0032] Figure 22 Standing wave curves in the first and second frequency bands when the antenna assembly provided in the embodiments of this application is in a free state and when the electronic device used is covered with a metal protective shell;

[0033] Figure 23 The system radiation efficiency and overall system efficiency curves in the first and second frequency bands when the antenna assembly provided by the related technology and the embodiments of this application is in a free state and when the applied electronic device is covered with a metal protective shell;

[0034] Figure 24 A schematic diagram of the standing wave curves of an antenna assembly provided in an embodiment of this application in the first and second frequency bands;

[0035] Figure 25 A schematic diagram of the standing wave curves of the antenna assembly provided in one embodiment of this application in the third and fourth frequency bands;

[0036] Figure 26 A schematic diagram of the current corresponding to the first resonant mode and the second enhancement mode provided in one embodiment;

[0037] Figure 27 A schematic diagram of the resonant current corresponding to the third resonant mode and the third enhancement mode of an antenna assembly provided in one embodiment;

[0038] Figure 28 A schematic diagram of an electronic device provided according to one embodiment of this application;

[0039] Figure 29 for Figure 28 The diagram shows a partial structural schematic of the electronic device. Detailed Implementation

[0040] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without creative effort are within the protection scope of this application.

[0041] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0042] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device comprising one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram of an antenna assembly provided according to an embodiment of this application. The antenna assembly 10 includes a first radiator 110 and a first feed source S1. The first radiator 110 includes a first ground terminal 111, a first feed point P1, and a first free terminal 112, which are sequentially disposed. The first feed source S1 is used to generate a first radio frequency signal and a second radio frequency signal, and the first feed source S1 is electrically connected to the first feed point P1. When the antenna assembly 10 is in a free state: the first radio frequency signal is used to excite the first radiator 110 to support a first frequency band, and the second radio frequency signal is used to excite the first radiator 110 to support a second frequency band, wherein the frequency of the second frequency band is lower than the frequency of the first frequency band. When the electronic device 1 to which the antenna assembly 10 is applied is covered with a metal protective shell, the second radio frequency signal excites the first radiator 110 to support at least a portion of the first frequency band.

[0044] The first radiator 110 can be a laser direct structuring (LDS) radiator, a flexible printed circuit (FPC) radiator, a printed direct structuring (PDS) radiator, or a metal dendrite radiator. When the antenna assembly 10 is applied to the electronic device 1, the first radiator 110 can be a device utilizing the electronic device 1 (see...). Figure 28 and Figure 29Mechanical Design Antenna (MDA) radiators with their own embedded metal design. For example, the first radiator 110 can utilize the plastic and metal frame 30 of the electronic device 1 (see...). Figure 28 and Figure 29 The first radiator 110 can also be a frame radiator designed for the metal frame 30.

[0045] The first grounding terminal 111 is electrically connected to the ground electrode. The grounding method of the first grounding terminal 111 can be, but is not limited to, being electrically connected to the ground electrode through a grounding component (such as a conductive spring, conductive adhesive, conductive screw, or connecting rib).

[0046] The first feed source S1 can be electrically connected to the first feed point P1 in a way that is not limited to, but can be, the first feed source S1 is electrically connected to the first feed point P1 through a feed component (such as a conductive spring, conductive adhesive, conductive screw, or connecting rib, etc.).

[0047] The first feed source S1 is used to generate a first radio frequency signal and a second radio frequency signal. The first feed source S1 is electrically connected to the first feed point P1 of the first radiator 110. Therefore, the first radio frequency signal and the second radio frequency signal are combined and excited on the same radiator (i.e., the first radiator 110), so that the antenna assembly 10 can share the same radiator (i.e., the first radiator 110) when supporting the first frequency band and the second frequency band. Compared with using a separate radiator for each frequency band, the first radiator 110 of the antenna assembly 10 provided in this application embodiment is smaller in size, which is beneficial to the miniaturization of the antenna assembly 10.

[0048] When the antenna assembly 10 is in a free state, the first radio frequency signal is used to excite the first radiator 110 to support a first frequency band, which can be, but is not limited to, the GPS L1 band. When the antenna assembly 10 is in a free state, the second radio frequency signal is used to excite the first radiator 110 to support a second frequency band, which can be, but is not limited to, the GPS L5 band. However, the first and second frequency bands are not limited to the examples above, as long as the frequency of the second frequency band is lower than the frequency of the first frequency band.

[0049] A metal protective case refers to a protective case containing metal or made of metal. A protective case is typically an accessory placed on the outside of the electronic device 1 to protect it. The protective case is not part of the electronic device 1. The protective case can be fitted onto the electronic device 1 or removed from it.

[0050] Compared to the second frequency band generated by the second radio frequency signal exciting the first radiator 110 when the antenna assembly 10 is in free space, due to the influence of the metal protective shell, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, the frequency band supported by the second radio frequency signal exciting the first radiator 110 experiences frequency deviation. For ease of description, the frequency band supported by the second radio frequency signal exciting the first radiator 110 when the electronic device 1 to which the antenna assembly 10 is applied is named the first preset frequency band. As can be seen from the foregoing, the first preset frequency band is different from the second frequency band.

[0051] When the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, the second radio frequency signal excites the first radiator 110 to support at least a portion of the first frequency band. Specifically, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, the second radio frequency signal excites the first radiator 110 to support a first preset frequency band, and at least a portion of the first preset frequency band falls within the first frequency band.

[0052] Since the frequency of the second frequency band is lower than that of the first frequency band, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, the second radio frequency signal excites the first preset frequency band supported by the first radiator 110 to shift to a higher frequency relative to the second frequency band, causing at least a portion of the first preset frequency band to fall within the first frequency band. Therefore, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, the bandwidth of the first frequency band is increased.

[0053] In summary, the antenna assembly 10 provided in this application has a first feed source S1 used to generate a first radio frequency (RF) signal and a second RF signal. The first feed source S1 is electrically connected to the first feed point P1 of the first radiator 110. Therefore, the first RF signal and the second RF signal are combined to excite the same first radiator 110, enabling the first radiator 110 to support both a first frequency band and a second frequency band. Compared to when the antenna assembly 10 is in a free state, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective case, the frequency band supported by the first radiator 110 excited by the second RF signal is frequency-biased compared to the second frequency band due to the influence of the metal protective case. When the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective case, the frequency band supported by the first radiator 110 excited by the second RF signal shifts to a higher frequency compared to the second frequency band, thereby causing at least a portion of the frequency band supported by the first radiator 110 excited by the second RF signal to fall into the range of the first frequency band. Therefore, when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective shell, the second radio frequency signal excites the first radiator 110 to support at least a portion of the first frequency band, so that when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective shell, the antenna assembly 10 still has a large bandwidth in the first frequency band, and the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective shell and still has good antenna performance in the first frequency band.

[0054] Please refer to the following: Figure 1 and Figure 2 , Figure 2 for Figure 1 The diagram shows the resonant current corresponding to the first resonant mode of the antenna assembly. The first radio frequency signal excites the first resonant mode of the first radiator 110 to support the first frequency band, wherein the first resonant mode is a quarter-wavelength mode of the first radiator 110.

[0055] As can be seen from the structure of the first radiator 110, the first radiator 110 is also called an inverted-F radiator (IFA). Therefore, the first resonant mode is also called the quarter-wavelength IFA mode of the first radiator 110.

[0056] The resonant mode when the first radio frequency signal excites the first radiator 110 to support the first frequency band is named the first resonant mode, and the resonant current corresponding to the first resonant mode is named the first resonant current I11.

[0057] The first resonant current I11 is distributed from the first ground terminal 111 to the first free terminal 112. During the half-wavelength period shown in the schematic diagram of this embodiment, the first resonant current I11 flows from the first ground terminal 111 to the first free terminal 112. It can be understood that the first resonant current I11 is periodically changing; in the next half-wavelength period, the first resonant current I11 flows from the first free terminal 112 to the first ground terminal 111.

[0058] The quarter-wavelength mode is also called the fundamental mode. The first resonant mode of the first radiator 110, excited by the first radio frequency signal, supports the first frequency band. The first resonant mode is the quarter-wavelength mode of the first radiator 110; in other words, the fundamental mode of the first radiator 110 supports the first frequency band. When the fundamental mode of the first radiator 110 supports the first frequency band, it has better radiation efficiency.

[0059] Please refer to the following: Figure 1 and Figure 3 , Figure 3 for Figure 1 The diagram shows the resonant current corresponding to the second resonant mode of the antenna assembly. The second radio frequency signal excites the second resonant mode of the first radiator 110, wherein the second resonant mode is the composite left-handed mode (CRLH) of the first radiator 110.

[0060] The resonant mode when the second radio frequency signal excites the first radiator 110 to support the second frequency band is named the second resonant mode, and correspondingly, the resonant current corresponding to the second resonant mode is named the second resonant current I12.

[0061] The second resonant mode is a composite left- and right-handed mode of the first radiator 110. In other words, the second resonant mode is an eighth-wavelength mode of the first radiator 110. The second resonant current I12 is mainly distributed from the first ground terminal 111 of the first radiator 110 to the first feed point P1; the second resonant current I12 is also distributed from the first feed point P1 of the first radiator 110 to the first free end 112, but the current is smaller.

[0062] The second resonant current I12 is distributed from the first ground terminal 111 to the first free terminal 112. Specifically, the second resonant current I12 is mainly distributed from the first ground terminal 111 of the first radiator 110 to the first feed point P1; the second resonant current I12 is also distributed from the first feed point P1 of the first radiator 110 to the first free terminal 112, but the current is smaller. The portion of the second resonant current I12 distributed from the first feed point P1 of the first radiator 110 to the first free terminal 112 is not shown in the diagram. In the half-wavelength period shown in the schematic diagram of this embodiment, the second resonant current I12 flows from the first ground terminal 111 to the first free terminal 112. It can be understood that the second resonant current I12 changes periodically; in the next half-wavelength period, the second resonant current I12 flows from the first free terminal 112 to the first ground terminal 111.

[0063] The antenna assembly 10 provided in this application supports the first frequency band using a quarter-wavelength mode of the first radiator 110 and supports the second frequency band using a composite left-handed and right-handed mode of the first radiator 110. This allows the antenna assembly 10 to support both the first and second frequency bands by reusing the same first radiator 110, enabling the antenna assembly 10 to meet the communication requirements of both the first and second frequency bands. This achieves the reuse of the first radiator 110 and is beneficial for the miniaturization of the antenna assembly 10.

[0064] Please see Figure 4 , Figure 4 This is a schematic diagram of an antenna assembly provided according to another embodiment of this application. The antenna assembly 10 includes a first radiator 110 and a first feed source S1. The first radiator 110 includes a first ground terminal 111, a first feed point P1, and a first free terminal 112, which are sequentially disposed. The first feed source S1 is used to generate a first radio frequency signal and a second radio frequency signal, and the first feed source S1 is electrically connected to the first feed point P1. When the antenna assembly 10 is in a free state: the first radio frequency signal is used to excite the first radiator 110 to support a first frequency band, and the second radio frequency signal is used to excite the first radiator 110 to support a second frequency band, wherein the frequency of the second frequency band is lower than the frequency of the first frequency band. When the electronic device 1 to which the antenna assembly 10 is applied is covered with a metal protective shell, the second radio frequency signal excites the first radiator 110 to support at least a portion of the first frequency band.

[0065] Please refer to the previous description for the first feed source S1 and the first radiator 110, etc., and they will not be repeated here.

[0066] Furthermore, in this embodiment, the first radiator 110 also has a second feed point P2. The second feed point P2 is spaced apart from the first feed point P1, and the second feed point P2 is closer to the first free end 112 than the first feed point P1.

[0067] The antenna assembly 10 further includes a second feed source S2. The second feed source S2 is used to generate a third radio frequency signal and a fourth radio frequency signal. The second feed source S2 is electrically connected to the second feed point P2. When the antenna assembly 10 is in a free state: the third radio frequency signal excites the first radiator 110 to support a third frequency band, and the fourth radio frequency signal excites the first radiator 110 to support a fourth frequency band. The frequency of the third frequency band is greater than the frequency of the first frequency band, and the frequency of the fourth frequency band is greater than the frequency of the third frequency band.

[0068] The second feed source S2 can be electrically connected to the second feed point P2 in a manner that is not limited to, but can be, the second feed source S2 being electrically connected to the second feed point P2 through a feed component (such as a conductive spring, conductive adhesive, conductive screw, or connecting rib, etc.).

[0069] The second feed source S2 is used to generate the third radio frequency signal and the fourth radio frequency signal. The second feed source S2 is electrically connected to the second feed point P2 of the first radiator 110. Therefore, the third radio frequency signal and the fourth radio frequency signal are combined to the same radiator (i.e., the first radiator 110). This allows the antenna assembly 10 to share the same radiator (i.e., the first radiator 110) when supporting the first frequency band, the second frequency band, the third frequency band, and the fourth frequency band. Compared to using a separate radiator for each frequency band, the first radiator 110 of the antenna assembly 10 provided in this application embodiment is smaller in size, which is beneficial to the miniaturization of the antenna assembly 10.

[0070] Furthermore, the antenna assembly 10 provided in this application embodiment can support a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band, and has communication functions for the first frequency band, the second frequency band, the third frequency band, and the fourth frequency band.

[0071] When the antenna assembly 10 is in a free state, the third radio frequency signal is used to excite the first radiator 110 to support a third frequency band, which can be, but is not limited to, the WiFi 2.4G frequency band. When the antenna assembly 10 is in a free state, the fourth radio frequency signal is used to excite the first radiator 110 to support a fourth frequency band, which can be, but is not limited to, the N78 frequency band. However, the third and fourth frequency bands are not limited to the examples above, as long as the frequency of the fourth frequency band is greater than the frequency of the third frequency band.

[0072] Please see Figure 5 , Figure 5 This is a schematic diagram of an antenna assembly provided in another embodiment of this application. In this embodiment, the antenna assembly 10 includes a first radiator 110, a first feed S1, and a second feed S2. The first radiator 110, the first feed S1, and the second feed S2 are described above and will not be repeated here. Furthermore, the antenna assembly 10 also includes a first bandpass circuit 130. One end of the first bandpass circuit 130 is electrically connected to the first feed point P1, and the other end of the first bandpass circuit 130 is grounded. The first bandpass circuit 130 is a bandpass circuit for the third frequency band.

[0073] The antenna assembly 10 further includes a first bandpass circuit 130, one end of which is electrically connected to the first feed point P1, and the other end of which is grounded. The first bandpass circuit is the bandpass circuit for the third frequency band; therefore, the third radio frequency signal is grounded through the first feed point P1 and the first bandpass circuit 130. In other words, the first feed point P1 serves as the grounding point for the third radio frequency signal in the third frequency band supported by the first radiator 110.

[0074] Compared to the antenna assembly 10 that does not include the first bandpass circuit 130, the antenna assembly 10 provided in this application embodiment further includes the first bandpass circuit 130, thereby enabling the antenna assembly 10 to have better antenna performance in the third frequency band.

[0075] Please refer to Figure 6 , Figure 6 for Figure 5 The diagram shows the resonant current corresponding to the antenna assembly supporting the third frequency band. The second feed S2 excites the third resonant mode and the first enhancement mode of the first radiator 110 to support the third frequency band. The resonant current corresponding to the third resonant mode (also called the third resonant current I13) is distributed from the first feed point P1 to the first free end 112. The resonant current corresponding to the first enhancement mode is distributed between the first ground end 111 and the first feed point P1, and the resonant current corresponding to the first enhancement mode flows in the same direction as the resonant current corresponding to the third resonant mode.

[0076] The third radio frequency signal excites the third resonant mode of the first radiator 110, and the resonant current corresponding to the third resonant mode is named the third resonant current I13.

[0077] In the schematic diagram of this embodiment, during the half-wavelength period, the third resonant current I13 flows from the first feed point P1 to the first free end 112. It can be understood that the third resonant current I13 is periodically changing, and during the next half-wavelength period, the third resonant current I13 flows from the first free end 112 to the first feed point P1.

[0078] As described above, the first feed point P1 serves as the lower point where the first radiator 110 supports the third radio frequency signal in the third frequency band. The third resonant mode is the quarter-wavelength mode from the first feed point P1 to the first free end 112 of the first radiator 110, also known as the quarter-wavelength IFA mode from the first feed point P1 to the first free end 112 of the first radiator 110.

[0079] The third resonant mode is a quarter-wavelength mode from the first feed point P1 to the first free end 112 of the first radiator 110. That is, the fundamental mode of the radiating portion from the first feed point P1 to the first free end 112 of the first radiator 110 supports the third frequency band, thereby enabling the first radiator 110 to have better radiation efficiency when supporting the third frequency band.

[0080] For ease of description, the resonant current corresponding to the first enhancement mode is named the first enhancement current I21. In the current half-wavelength period shown in the schematic diagram of this embodiment, the first enhancement current I21 flows from the first ground terminal 111 to the first feed point P1. It can be understood that the first enhancement current I21 is periodically changing; in the next half-wavelength period, the first enhancement current I21 flows from the first feed point P1 to the first ground terminal 111.

[0081] Understandably, the resonant current (i.e., the first enhanced current I21) corresponding to the first enhanced mode and the resonant current (i.e., the third resonant current I13) corresponding to the third resonant mode have the same flow direction. This means that when the first enhanced current I21 flows from the first grounding terminal 111 to the first feed point P1, the third resonant current I13 flows from the first feed point P1 to the first free terminal 112; correspondingly, when the first enhanced current I21 flows from the first feed point P1 to the first grounding terminal 111, the third resonant current I13 flows from the first free terminal 112 to the first feed point P1.

[0082] In other words, when the antenna assembly 10 provided in this application supports the third frequency band, the second feed source S2 not only excites the third resonant current I13 of the first radiator 110, but also excites the first enhancement current I21 in the same direction as the third resonant current I13, thereby enabling the antenna assembly 10 to have better antenna performance in the third frequency band.

[0083] In summary, the antenna assembly 10 provided in this application embodiment uses the second feed S2 to excite the third resonant mode and the first enhancement mode (also called the first auxiliary mode) of the first radiator 110 to support the third frequency band. The resonant current corresponding to the first enhancement mode and the resonant current corresponding to the third resonant mode have the same flow direction, thereby enabling the antenna assembly 10 to have better antenna performance in the third frequency band.

[0084] Please see Figure 7 , Figure 7 for Figure 5 The diagram shows the resonant current corresponding to the antenna assembly supporting the fourth frequency band. The second feed S2 of the antenna assembly 10 excites the first radiator 110 to a fourth resonant mode to support the fourth frequency band. The current corresponding to the fourth resonant mode is distributed from the second feed point P2 to the first free end 112. The resonant current corresponding to the fourth resonant mode is named the fourth resonant current I14. The fourth resonant current I14 is distributed from the second feed point P2 to the first free end 112.

[0085] In the schematic diagram of this embodiment, during the half-wavelength period, the fourth resonant circuit flows from the second feed point P2 to the first free end 112. It can be understood that the fourth resonant current I14 is periodically changing, and in the next half-wavelength period, the fourth resonant current I14 flows from the first free end 112 to the second feed point P2.

[0086] In this embodiment, the fourth resonant mode is a quarter-wavelength mode from the second feed point P2 of the first radiator 110 to the first free end 112.

[0087] Please refer to the following: Figure 5 and Figure 8 , Figure 8 for Figure 5 The diagram shows a schematic of the first bandpass circuit of the antenna assembly. In this embodiment, the first bandpass circuit 130 includes a first capacitor C1 and a first inductor L1. One end of the first capacitor C1 is electrically connected to the first feed point P1. One end of the first inductor L1 is electrically connected to the other end of the first capacitor C1, and the other end of the first inductor L1 is grounded.

[0088] The first bandpass circuit 130 includes a first capacitor C1 and a first inductor L1. One end of the first capacitor C1 is electrically connected to the first feed point P1. One end of the first inductor L1 is electrically connected to the other end of the first capacitor C1, and the other end of the first inductor L1 is grounded. Therefore, in the antenna assembly 10 provided in this application embodiment, the first bandpass circuit 130 includes a first capacitor C1 and a first inductor L1 connected in series.

[0089] For the third frequency band, the third radio frequency signal is grounded through the first feed point P1, the first capacitor C1, and the first inductor L1. In other words, the first feed point P1 serves as the grounding point for the third radio frequency signal of the third frequency band supported by the first radiator 110.

[0090] Compared to the antenna assembly 10 which does not include the first bandpass circuit 130, the antenna assembly 10 provided in this application embodiment further includes the first bandpass circuit 130, thereby enabling the antenna assembly 10 to have better antenna performance in the third frequency band.

[0091] In addition, the first bandpass circuit 130 includes the first capacitor C1 and the first inductor L1, and its structure is simple and easy to implement.

[0092] Please see Figure 9 , Figure 9 This is a schematic diagram of an antenna assembly provided in yet another embodiment of this application. In this embodiment, the antenna assembly 10 includes a first radiator 110, a first feed S1, a second feed S2, and a first bandpass circuit 130. The first radiator 110, the first feed S1, the second feed S2, and the first bandpass circuit 130 are described above and will not be repeated here. Further, in this embodiment, the antenna assembly 10 also includes a second bandpass circuit 140. One end of the second bandpass circuit 140 is electrically connected to the first feed point P1, and the other end of the second bandpass circuit 140 is grounded. The second bandpass circuit 140 is the bandpass circuit for the fourth frequency band.

[0093] One end of the second bandpass circuit 140 is electrically connected to the first feed point P1, and the other end of the second bandpass circuit 140 is grounded. The second bandpass circuit 140 is the bandpass circuit for the fourth frequency band. Therefore, the radio frequency signal of the fourth frequency band is grounded through the first feed point P1 and the second bandpass circuit 140. In other words, the first feed point P1 serves as the grounding point for the fourth radio frequency signal of the fourth frequency band supported by the first radiator 110.

[0094] Compared to the antenna assembly 10 that does not include the second bandpass circuit 140, the antenna assembly 10 provided in this application embodiment further includes the second bandpass circuit 140, thereby enabling the antenna assembly 10 to have better antenna performance in the fourth frequency band.

[0095] Please refer to the following: Figure 9 and Figure 10 , Figure 10 for Figure 9 The diagram shows a schematic of the second bandpass circuit. In this embodiment, the second bandpass circuit 140 includes a second capacitor C2, a second inductor L2, and a third inductor L3. One end of the second capacitor C2 is electrically connected to the first feed point P1. The second inductor L2 is connected in parallel with the second capacitor C2. One end of the third inductor L3 is electrically connected to the other end of the second capacitor C2, and the other end of the third inductor L3 is grounded.

[0096] Compared to the antenna assembly 10 that does not include the second bandpass circuit 140, the antenna assembly 10 provided in this application embodiment further includes the second bandpass circuit 140, thereby enabling the antenna assembly 10 to have better antenna performance in the fourth frequency band.

[0097] Furthermore, the second bandpass circuit 140 in the antenna assembly 10 provided in this application includes a second capacitor C2, a second inductor L2 and a third inductor L3, and the structure is simple and easy to implement.

[0098] Please see Figure 11 , Figure 11 This is a schematic diagram of an antenna assembly provided in another embodiment of this application. In this embodiment, the antenna assembly 10 includes a first radiator 110, a first feed S1, a second feed S2, a first bandpass circuit 130, and a second bandpass circuit 140. The first radiator 110, the first feed S1, the second feed S2, the first bandpass circuit 130, and the second bandpass circuit 140 are described above and will not be repeated here. In this embodiment, the antenna assembly 10 also includes a first impedance matching circuit 150. The first feed S1 is electrically connected to the first impedance matching circuit 150 to the first feed point P1. The first impedance matching circuit 150 is used to perform impedance matching between the first feed S1 and the first radiator 110.

[0099] The antenna assembly 10 further includes a first impedance matching circuit 150, which is used to match the output impedance of the first feed S1 and the input impedance of the first radiator 110, so that the first radiator 110 has better antenna performance when supporting the first frequency band, and also has better antenna performance when supporting the second frequency band.

[0100] Please refer to the following: Figure 11 and Figure 12 , Figure 12 for Figure 11 The diagram shows a schematic of the first impedance matching circuit of the antenna assembly. The first impedance matching circuit 150 includes a third capacitor C3, a fourth capacitor C4, a fourth inductor L4, a fifth capacitor C5, and a fifth inductor L5. One end of the third capacitor C3 is electrically connected to the first feed source S1. One end of the fourth capacitor C4 is electrically connected to the other end of the third capacitor C3. One end of the fourth inductor L4 is electrically connected to the other end of the fourth capacitor C4, and the other end of the fourth inductor L4 is electrically connected to the first feed point P1. One end of the fifth capacitor C5 is electrically connected to the first end of the fourth inductor L4, and the other end of the fifth capacitor C5 is grounded. One end of the fifth inductor L5 is electrically connected to the first end of the fifth capacitor C5, and the other end of the fifth inductor L5 is grounded.

[0101] The antenna assembly 10 provided in this application embodiment has a first impedance matching circuit 150 that matches the output impedance of the first feed S1 and the input impedance of the first radiator 110, thereby enabling the first radiator 110 to have better antenna performance when supporting the first frequency band, and also enabling the first radiator 110 to have better antenna performance when supporting the second frequency band.

[0102] Furthermore, the first impedance matching circuit 150 in the antenna assembly 10 provided in this application embodiment has a simple and easy-to-implement structure.

[0103] Please see Figure 13 and Figure 14 , Figure 13 A schematic diagram of an antenna assembly provided in another embodiment of this application; Figure 14 for Figure 13 The diagram shows a partial structure of the antenna assembly. In this embodiment, the antenna assembly 10 further includes a band-stop circuit 160. The second feed source S2 is electrically connected to the band-stop circuit 160 to the second feed point P2, and the band-stop circuit 160 is a band-stop circuit 160 for the first frequency band.

[0104] The antenna assembly 10 further includes a band-stop circuit 160 that can be incorporated into the antenna assembly 10 provided in any of the preceding embodiments. In the schematic diagram of this embodiment, the example shown is that the antenna assembly 10 further includes a band-stop circuit 160 incorporated into a band-stop circuit 160 provided in a preceding embodiment. It should be understood that this should not be construed as a limitation on the embodiments of this application.

[0105] In this embodiment, the antenna assembly 10 further includes a band-stop circuit 160, which is a band-stop circuit 160 for the first frequency band. Therefore, the second feed point P2 is equivalent to an open circuit for the first frequency band. When the second feed source S2 is electrically connected to the second feed point P2 to excite the first radiator 110 to support the third and fourth frequency bands, the antenna radiator also includes the band-stop circuit 160. This prevents the first frequency band from adversely affecting the antenna performance of the third frequency band and also prevents the first frequency band from affecting the antenna performance of the fourth frequency band, thereby enabling the antenna assembly 10 to have good antenna performance in both the third and fourth frequency bands.

[0106] In one embodiment, the resistive circuit 160 includes a sixth inductor L6 and a sixth capacitor C6. One end of the sixth inductor L6 is electrically connected to the second feed source S2, and the other end of the sixth inductor L6 is electrically connected to the second feed point P2. The sixth capacitor C6 is connected in parallel with the sixth inductor L6.

[0107] In this embodiment, the band-stop circuit 160 includes a sixth inductor L6 and a sixth capacitor C6. The sixth inductor L6 and the sixth capacitor C6 together function as the band-stop circuit 160 for the first frequency band. Therefore, the second feed point P2 is equivalent to an open circuit for the first frequency band. When the second feed source S2 is electrically connected to the second feed point P2 to excite the first radiator 110 to support the third and fourth frequency bands, the antenna radiator also includes the band-stop circuit 160. This prevents the first frequency band from adversely affecting the antenna performance of the third frequency band and also prevents the first frequency band from affecting the antenna performance of the fourth frequency band. As a result, the antenna assembly 10 has good antenna performance in both the third and fourth frequency bands.

[0108] In this embodiment, the circuit 160 with resistance includes a sixth inductor L6 and a sixth capacitor C6, and its structure is simple and easy to implement.

[0109] For further information, please refer to [link / reference]. Figure 13 The antenna assembly 10 further includes a second impedance matching circuit 170. The second feed source S2 is electrically connected in sequence to the second impedance matching circuit 170 and the band-stop circuit 160 to the second feed point P2. The second impedance matching circuit 170 is used to perform impedance matching between the second feed source S2 and the first radiator 110.

[0110] The antenna assembly 10 further includes a second impedance matching circuit 170, which is used to match the output impedance of the second feed source S2 and the input impedance of the first radiator 110, so that the first radiator 110 has better antenna performance when supporting the third frequency band, and also has better antenna performance when supporting the fourth frequency band.

[0111] Further, please refer to Figure 14 In this embodiment, the second impedance matching circuit 170 includes a seventh capacitor C7, an eighth capacitor C8, a seventh inductor L7, and an eighth inductor L8. One end of the seventh capacitor C7 is electrically connected to the second feed source S2. One end of the eighth capacitor C8 is electrically connected to the other end of the seventh capacitor C7. One end of the seventh inductor L7 is electrically connected to the other end of the eighth capacitor C8, and the other end of the seventh inductor L7 is electrically connected to the resistive circuit 160. One end of the eighth inductor L8 is electrically connected to the other end of the seventh inductor L7, and the other end of the eighth inductor L8 is grounded.

[0112] In this embodiment, the second impedance matching circuit 170 includes a seventh capacitor C7, an eighth capacitor C8, a seventh inductor L7, and an eighth inductor L8, which can better match the output impedance of the second feed source S2 and the input impedance of the first radiator 110, thereby enabling the first radiator 110 to have better antenna performance when supporting the third frequency band, and also enabling the first radiator 110 to have better antenna performance when supporting the fourth frequency band.

[0113] In addition, the second impedance matching circuit 170 includes a seventh capacitor C7, an eighth capacitor C8, a seventh inductor L7 and an eighth inductor L8, and the structure of the second impedance matching circuit 170 is simple and easy to implement.

[0114] Please see Figure 15 , Figure 15 This is a schematic diagram of an antenna assembly provided in yet another embodiment of this application. In this embodiment, the antenna assembly 10 further includes a second radiator 120 and a third feed source S3. The antenna assembly 10, including the second radiator 120 and the third feed source S3, can be incorporated into the antenna assembly 10 provided in any of the preceding embodiments. In the schematic diagram of this embodiment, the example given is that the antenna assembly 10 also includes the second radiator 120 and the third feed source S3 incorporated into the antenna assembly 10 provided in a preceding embodiment. It should be understood that this should not be construed as a limitation on the antenna assembly 10 provided in the embodiments of this application.

[0115] The second radiator 120 includes a second free end 121, a third feed point P3, and a second ground end 122 arranged sequentially. The second free end 121 is opposite to the first free end 112 and separated by a coupling gap 110a. The second radiator 120 and the first radiator 110 are coupled through the coupling gap 110a. The third feed source S3 is used to generate a fifth radio frequency signal, and the third feed source S3 is electrically connected to the third feed point P3. When the antenna assembly 10 is in a free state: the fifth radio frequency signal excites the second radiator 120 to support a fifth frequency band. The frequency of the fifth frequency band is greater than the frequency of the first frequency band. When the electronic device 1 to which the antenna assembly 10 is applied is covered with a metal protective shell, the fifth radio frequency signal is used to excite the second radiator 120 to support at least a portion of the first frequency band.

[0116] The second radiator 120 can be a laser direct structuring (LDS) radiator, a flexible printed circuit (FPC) radiator, a printed direct structuring (PDS) radiator, or a metal dendrite radiator. When the antenna assembly 10 is applied to the electronic device 1, the second radiator 120 can be a device utilizing the electronic device 1 (see...). Figure 28 and Figure 29 Mechanical Design Antenna (MDA) radiators with their own embedded metal design. For example, the second radiator 120 can utilize the plastic and metal frame 30 of the electronic device 1 (see...). Figure 28 and Figure 29 The second radiator 120 can also be a frame radiator designed for the metal frame 30. The type of the second radiator 120 can be the same as or different from the type of the first radiator 110.

[0117] The second grounding terminal 122 is electrically connected to the ground electrode. The grounding method of the second grounding terminal 122 can be, but is not limited to, being electrically connected to the ground electrode through a grounding component (such as a conductive spring, conductive adhesive, conductive screw, or connecting rib).

[0118] The third feed source S3 can be electrically connected to the third feed point P3 in a manner that is not limited to, but can be, through a feed component (such as a conductive spring, conductive adhesive, conductive screw, or connecting rib, etc.) to the third feed point P3.

[0119] Compared to the fifth frequency band generated by the fifth radio frequency signal exciting the first radiator 110 when the antenna assembly 10 is in free space, the frequency band supported by the fifth radio frequency signal exciting the second radiator 120 experiences frequency deviation when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, due to the influence of the metal protective shell. For ease of description, the frequency band supported by the fifth radio frequency signal exciting the second radiator 120 when the electronic device 1 to which the antenna assembly 10 is applied is named the second preset frequency band. As can be seen from the foregoing, the second preset frequency band is different from the fifth frequency band.

[0120] When the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective casing, the fifth radio frequency signal excites the second radiator 120 to support at least a portion of the first frequency band. Specifically, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective casing, the fifth radio frequency signal excites the second radiator 120 to support the second preset frequency band, and at least a portion of the second preset frequency band falls within the first frequency band.

[0121] Since the frequency of the fifth frequency band is higher than that of the first frequency band, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, the fifth radio frequency signal excites the second preset frequency band supported by the second radiator 120 to shift to a lower frequency relative to the fifth frequency band, causing at least a portion of the second preset frequency band to fall within the first frequency band. Therefore, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, the bandwidth of the first frequency band is increased.

[0122] In summary, the antenna assembly 10 provided in this application, when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective shell, causes the frequency band supported by the second radiator 120, excited by the fifth radio frequency signal, to shift to a lower frequency band compared to the fifth frequency band. This results in at least a portion of the frequency band supported by the second radiator 120 falling within the range of the first frequency band. Therefore, when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective shell, the fifth radio frequency signal excites the second radiator 120 to support at least a portion of the first frequency band. This ensures that the antenna assembly 10 still has a large bandwidth in the first frequency band, and thus maintains good antenna performance in the first frequency band even when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective shell.

[0123] Please refer to the following: Figure 15 and Figure 16 , Figure 16 for Figure 15The diagram illustrates the resonant currents corresponding to the first resonant mode and the second enhancement mode in the antenna assembly shown. The first feed S1 is also used to excite the second radiator 120 in the second enhancement mode to support the first frequency band. The resonant current corresponding to the second enhancement mode is distributed between the second free end 121 and the second ground end 122. When the first resonant current I11 corresponding to the first resonant mode flows from the first ground end 112 to the first free end 112, the second enhancement current I22 corresponding to the second enhancement mode (also called the second auxiliary mode) flows from the second free end 121 to the second ground end 122.

[0124] In this embodiment, when the antenna assembly 10 further includes a second radiator 120, the first feed S1 excites the first resonant mode of the first radiator 110 to support the first frequency band. Furthermore, since the second radiator 120 is coupled to the first radiator 110 through the coupling gap 110a, the first feed S1 can also excite the second enhanced mode of the second radiator 120 to support the first frequency band. This ensures that even when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective casing, the antenna assembly 10 still exhibits good antenna performance in the first frequency band.

[0125] In the current half-wavelength period shown in the schematic diagram of this embodiment: the first resonant current I11 corresponding to the first resonant mode flows from the first ground terminal 111 to the first free terminal 112, and correspondingly, the second enhancement current I22 corresponding to the second enhancement mode flows from the second free terminal 121 to the second ground terminal 122. It can be understood that both the first resonant current I11 and the second enhancement current I22 are periodically changing. In the next half-wavelength period: the first resonant current I11 corresponding to the first resonant mode flows from the first free terminal 112 to the first ground terminal 111, and correspondingly, the second enhancement current I22 corresponding to the second enhancement mode flows from the second ground terminal 122 to the second free terminal 121. The first resonant current I11 and the second enhancement current I22 shown in the schematic diagram of this embodiment should not be construed as limiting the antenna assembly 10 provided in this application embodiment.

[0126] Please see Figure 17 , Figure 17 for Figure 15The diagram illustrates the resonant currents corresponding to the third resonant mode and the third enhancement mode in the antenna assembly shown. When the first radiator 110 has a second feed point P2, and the antenna assembly 10 further includes a second feed source S2, the second feed source S2 is also used to excite the third enhancement mode (also called the third auxiliary mode) of the second radiator 120 to support the third frequency band. The resonant current of the third enhancement mode is distributed between the second free end 121 and the second ground end 122, and the resonant current of the third enhancement mode flows in the same direction as the resonant current of the third resonant mode.

[0127] The third radio frequency signal excites the third resonant mode of the first radiator 110, and the resonant current corresponding to the third resonant mode is named the third resonant current I13.

[0128] In the schematic diagram of this embodiment, during the half-wavelength period, the third resonant current I13 flows from the first feed point P1 to the first free end 112. It can be understood that the third resonant current I13 is periodically changing, and during the next half-wavelength period, the third resonant current I13 flows from the first free end 112 to the first feed point P1.

[0129] As described above, the first feed point P1 serves as the lower point where the first radiator 110 supports the third radio frequency signal in the third frequency band. The third resonant mode is the quarter-wavelength mode from the first feed point P1 to the first free end 112 of the first radiator 110, also known as the quarter-wavelength IFA mode from the first feed point P1 to the first free end 112 of the first radiator 110.

[0130] The third resonant mode is a quarter-wavelength mode from the first feed point P1 to the first free end 112 of the first radiator 110. That is, the fundamental mode of the radiating portion from the first feed point P1 to the first free end 112 of the first radiator 110 supports the third frequency band, thereby enabling the first radiator 110 to have better radiation efficiency when supporting the third frequency band.

[0131] As described above, the third resonant mode supports the third frequency band. Furthermore, in this embodiment, the second feed source S2 is also used to excite the third enhancement mode of the second radiator 120 to support the third frequency band. Therefore, the antenna assembly 10 provided in this application embodiment has better antenna performance in the third frequency band.

[0132] Understandably, the resonant current corresponding to the third resonant mode is called the third resonant current I13, and the resonant current corresponding to the third enhancement mode is also called the third enhancement current I23.

[0133] The third enhancement current I23 of the third enhancement mode is distributed between the second free end 121 and the second ground end 122, and the resonant current of the third enhancement mode (i.e., the third enhancement current I23) flows in the same direction as the resonant current of the third resonant mode (i.e., the third resonant current I13). Specifically, in the current half-wavelength period shown in the schematic diagram of this embodiment: the third resonant current I13 flows from the first feed point P1 of the first radiator 110 to the first free end 112, and the third enhancement current I23 flows from the second free end 121 to the second ground end 122. It can be understood that both the third resonant current I13 and the third enhancement current I23 are periodically changing. In the next half-wavelength period: the third resonant current I13 flows from the first free end 112 to the first feed point P1, and the third enhancement current I23 flows from the second ground end 122 to the second free end 121.

[0134] When the second feed S2 excites the third resonant mode and the first enhancement mode of the first radiator 110 to support the third frequency band, the third radio frequency signal excites the third resonant mode of the first radiator 110. The resonant current corresponding to the first enhancement mode is named the first enhancement current I21. During the current half-wavelength period, the first enhancement current I21 flows from the first ground terminal 111 to the first feed point P1.

[0135] Please see Figure 18 and Figure 19 , Figure 18 A schematic diagram of an antenna assembly provided for another embodiment of this application; Figure 19 for Figure 18 The diagram shows a schematic representation of some components in the antenna assembly. In this embodiment, the antenna assembly 10 further includes an aperture tuning circuit 180. One end of the aperture tuning circuit is electrically connected to the third feed point P3, and the other end is grounded. The aperture tuning circuit 180 is used to perform aperture tuning on the fifth frequency band so that the frequency of the fifth frequency band is greater than the frequency of the first frequency band.

[0136] In this embodiment, the antenna assembly 10 further includes an aperture tuning circuit 180, which performs aperture tuning on the fifth frequency band, such that the frequency of the fifth frequency band excited by the fifth radio frequency signal is greater than the frequency of the first frequency band. Therefore, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective case, the frequency band generated by the second radiator 120 excited by the fifth radio frequency signal is frequency-offset compared to the fifth frequency band. This results in the second radiator 120 supporting at least a portion of the first frequency band when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective case. Consequently, even when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective case, the antenna assembly 10 still has a large bandwidth in the first frequency band, resulting in better antenna performance in the first frequency band when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective case.

[0137] Please see Figure 19 The aperture tuning circuit 180 includes a tuning inductor L0 and an isolation capacitor C0. One end of the tuning inductor L0 is electrically connected to the third feed point P3. One end of the isolation capacitor C0 is electrically connected to the other end of the tuning inductor L0, and the other end of the isolation capacitor C0 is grounded.

[0138] In this embodiment, the aperture tuning circuit 180 includes a tuning inductor L0, which can effectively tune the fifth frequency band, ensuring that the frequency of the fifth frequency band excited by the fifth radio frequency signal is greater than the frequency of the first frequency band. Therefore, when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective case, the frequency band generated by the second radiator 120 excited by the fifth radio frequency signal is frequency-biased compared to the fifth frequency band. This means that when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective case, the second radiator 120 excited by the fifth radio frequency signal supports at least a portion of the first frequency band. Consequently, even when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective case, the antenna assembly 10 still has a large bandwidth in the first frequency band, resulting in better communication performance in the first frequency band when the electronic device 1 to which the antenna assembly 10 is applied is fitted with a metal protective case.

[0139] In addition, the aperture tuning circuit 180 also includes an isolation capacitor C0, which is used to isolate the fifth frequency band. Therefore, the isolation capacitor C0 is open-circuited to the fifth frequency band, so as not to affect the performance of the fifth frequency band.

[0140] Further, please refer to Figure 18The antenna assembly 10 further includes a third bandpass circuit 210. One end of the third bandpass circuit 210 is connected to the third feed point P3, and the other end of the third bandpass circuit 210 is grounded. The third bandpass circuit 210 is the bandpass circuit for the third frequency band.

[0141] In this embodiment, the antenna assembly 10 also includes a third bandpass circuit 210, which is a bandpass circuit for the third frequency band, thereby improving the antenna performance of the third frequency band supported by the antenna assembly 10.

[0142] Please see Figure 19 The third bandpass circuit 210 includes a ninth inductor L9 and a ninth capacitor C9. One end of the ninth inductor L9 is connected to the third feed point P3. One end of the ninth capacitor C9 is connected to the other end of the ninth inductor L9, and the other end of the ninth capacitor C9 is grounded.

[0143] In this embodiment, the antenna assembly 10 further includes a third bandpass circuit 210, which includes a ninth inductor L9 and a ninth capacitor C9. One end of the ninth inductor L9 is connected to the third feed point P3. One end of the ninth capacitor C9 is connected to the other end of the ninth inductor L9, and the other end of the ninth capacitor C9 is grounded, which can effectively improve the antenna performance of the third frequency band supported by the antenna assembly 10.

[0144] In addition, the third bandpass circuit 210 includes a ninth inductor L9 and a ninth capacitor C9, and its structure is simple and easy to implement.

[0145] Further, please refer to Figure 18 The antenna assembly 10 further includes a third impedance matching circuit 190. The third feed S3 is electrically connected to the third impedance matching circuit 190 to the third feed point P3, and the third impedance matching circuit 190 is used to perform impedance matching between the third feed S3 and the second radiator 120.

[0146] The antenna assembly 10 further includes a third impedance matching circuit 190, which is used to match the output impedance of the third feed S3 and the input impedance of the second radiator 120, so that the fifth frequency band supported by the second radiator 120 has better antenna performance.

[0147] Further, please refer to Figure 19In this embodiment, the third impedance matching circuit 190 includes a tenth inductor L10 and a tenth capacitor C10. One end of the tenth inductor L10 is electrically connected to the third feed source S3, and the other end of the tenth inductor L10 is electrically connected to the third feed point P3. One end of the tenth capacitor C10 is electrically connected to the third feed point P3, and the other end of the tenth capacitor C10 is grounded.

[0148] In this embodiment, the third impedance matching circuit 190 includes a tenth inductor L10 and a tenth capacitor C10. One end of the tenth inductor L10 is electrically connected to the third feed source S3, and the other end of the tenth inductor L10 is electrically connected to the third feed point P3. One end of the tenth capacitor C10 is electrically connected to the third feed point P3, and the other end of the tenth capacitor C10 is grounded. Therefore, the tenth inductor L10 and the tenth capacitor C10 can better match the output impedance of the third feed source S3 and the input impedance of the second radiator 120, so that the fifth frequency band supported by the second radiator 120 has better antenna performance.

[0149] In addition, the third impedance matching circuit 190 includes a tenth inductor L10 and a tenth capacitor C10, and its structure is simple and easy to implement.

[0150] Next, the performance of the antenna assembly 10 provided in the embodiments of this application will be simulated.

[0151] Please see Figure 20 , Figure 20 This is a comparison of the attenuation of the antenna assembly provided in one embodiment of this application in free space and in the electronic device using it, when encased in a metal protective shell, in the first frequency band and the second frequency band. In this embodiment, the thickness of the metal protective shell used for the antenna assembly 10 is 0.4 mm as an example, and the first frequency band is GPS L1 band and the second frequency band is GPS L5 band, respectively, for simulation. Figure 20 It is evident that when the electronic device 1 using the antenna assembly 10 provided in this embodiment is fitted with a metal protective shell, the attenuation in the first frequency band is 11.1 dB. In related technologies, compared to free space, the attenuation in the electronic device 1 using the antenna assembly 10 in those technologies, when fitted with a metal protective shell, is approximately 20 dB in the first frequency band. Therefore, it is clear that when the electronic device 1 using the antenna assembly 10 provided in this embodiment is fitted with a metal protective shell, the attenuation in the first frequency band is reduced, with an improvement of approximately 10 dB. When the first frequency band is the GPS L1 band, and the electronic device 1 using the antenna assembly 10 is fitted with a metal protective shell, the navigation requirements in the GSPL1 band can be met.

[0152] Please see Figure 21 and Figure 22 , Figure 21 Smith charts for the first and second frequency bands when the antenna assembly provided in the embodiments of this application is in a free state and when the applied electronic device is covered with a metal protective shell. Figure 22 The standing wave ratios (SWR) of the antenna assembly provided in the embodiments of this application in the first and second frequency bands are shown when it is in a free state and when the applied electronic device is covered with a metal protective shell. It should be noted that... Figure 21 and Figure 22 They convey the same meaning, only using different coordinate systems. For ease of illustration, Figure 21 (a) in the image is in color. Figure 21 (b) in the middle is Figure 21 The grayscale image of (a) in the image. Figure 21 The green curve represents the antenna assembly 10 in its free state, while the red curve represents the curve when the electronic device 1 to which the antenna assembly 10 is used is encased in a metal protective shell. Figure 22 In the diagram, the horizontal axis represents frequency in GHz, and the vertical axis represents S-parameters in dB. For ease of illustration, Figure 22 (a) in the image is in color. Figure 22 (b) in the middle is Figure 22 The grayscale image of (a) in the image. Curve ① (see...) Figure 22 The green curve in the figure represents the standing wave curve of antenna assembly 10 in a free state. Curve ② (see Figure 3) represents the standing wave curve of antenna assembly 10 in a free state. Figure 22 The red curve in the figure represents the standing wave curve (SWR) of the electronic device 1 to which the antenna assembly 10 is applied, when it is equipped with a metal protective shell. In curve ①, the indentation at point 3 corresponds to the second frequency band; while in curve ②, there is also an indentation between 1.2 GHz and 1.4 GHz. The frequency band corresponding to this indentation (marked as a in the figure) is the frequency band supported by the second radio frequency signal exciting the first radiator 110 when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell. It can be seen that compared to the second frequency band, frequency band a in curve ② shifts to a higher frequency and at least partially falls within the range of the first frequency band. Therefore, when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, the second radio frequency signal exciting the first radiator 110 supports at least a portion of the first frequency band, thus ensuring that the antenna assembly 10 still has a large bandwidth in the first frequency band when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell, and thus maintaining good antenna performance in the first frequency band when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell. Furthermore, in curve ② (see...) Figure 22In the red curve (as shown in the figure), there is also a dip between 2.0 GHz and 2.2 GHz. The frequency band corresponding to the dip (marked as b in the figure) is the resonance produced by the fifth radio frequency signal exciting the second radiator 120 when the electronic device 1 using the antenna assembly 10 is wearing a metal protective shell. This frequency band is shifted to a lower frequency band compared to the dip near 2.2 GHz in curve ①. Therefore, when the electronic device 1 using the antenna assembly 10 is wearing a metal protective shell, the fifth radio frequency signal excites the second radiator 120 to support at least a portion of the first frequency band. This ensures that even when the large-scale reverse device using the antenna assembly 10 is wearing a metal protective shell, the antenna assembly 10 still has a large bandwidth in the first frequency band, resulting in good antenna performance in the first frequency band even when the electronic device 1 using the antenna assembly 10 is wearing a metal protective shell.

[0153] Please see Figure 23 , Figure 23 The system radiation efficiency and overall system efficiency curves in the first and second frequency bands are shown for the antenna assembly provided in the related technology and embodiments of this application when it is in a free state and when the applied electronic device is covered with a metal protective shell. Figure 23 In the diagram, the horizontal axis represents frequency in GHz, and the vertical axis represents efficiency in dB. For ease of illustration, Figure 23 (a) in the image is in color. Figure 23 (b) in the middle is Figure 23 The grayscale image of (a) in the image. Curve ① (corresponding to...) Figure 23 The red curve in (a) represents the system radiation efficiency curve of the antenna assembly 10 in the free state provided in the related art; curve ② (corresponding to...) Figure 23 The green curve in (a) represents the system total efficiency curve of the antenna assembly 10 in the free state provided in the related technology; curve ③ (corresponding to...) Figure 23 The blue curve in (a) represents the system radiation efficiency curve of the electronic device 1 equipped with a metal protective shell when the antenna assembly 10 provided in this application is used; curve ④ (corresponding to...) Figure 23The orange curve in (a) represents the system total efficiency (STOE) curve when the electronic device 1 using the antenna assembly 10 provided in this application is fitted with a metal protective shell. It can be seen that, compared to related technologies, the electronic device 1 using the antenna assembly 10 provided in this application, fitted with a metal protective shell, experiences an attenuation of approximately 10 dB in the first frequency band. In contrast, in related technologies, the attenuation of the antenna assembly 10 in the first frequency band is approximately 20 dB compared to free space when fitted with a metal protective shell. Therefore, the electronic device 1 using the antenna assembly 10 provided in this application, fitted with a metal protective shell, experiences less attenuation in the first frequency band.

[0154] Please see Figure 24 , Figure 24 This is a schematic diagram of the standing wave ratio (SWR) curves of the antenna assembly provided in one embodiment of this application in the first and second frequency bands. In this embodiment, the horizontal axis represents frequency in GHz, and the vertical axis represents S-parameters in dB. As can be seen from this simulation diagram, the antenna assembly 10 provided in this embodiment supports the GPS L1 band in the first frequency band and the GPS L5 band in the second frequency band.

[0155] Please see Figure 25 , Figure 25 This is a schematic diagram of the standing wave ratio (SWR) curves of the antenna assembly provided in one embodiment of this application in the third and fourth frequency bands. In this embodiment, the horizontal axis represents frequency in GHz, and the vertical axis represents S-parameters in dB. As can be seen from this simulation diagram, the third frequency band supported by the antenna assembly 10 provided in this embodiment is the WiFi 2.4 band, and the fourth frequency band supported is the N78 band.

[0156] Please see Figure 26 , Figure 26 This is a schematic diagram of the currents corresponding to the first resonant mode and the second enhancement mode provided in one embodiment. For ease of illustration, Figure 26 (a) in the image is in color. Figure 26 (b) in the middle is Figure 26 The grayscale image is shown in (a). As can be seen from this simulation, the first resonant current I11 corresponding to the first resonant mode flows from the first free end 112 to the first ground end 111, and the second enhanced current I22 corresponding to the second enhanced mode flows from the second ground end 122 to the second free end 121. The second enhanced current I22 flows in the same direction as the first resonant current I11.

[0157] Please see Figure 27 , Figure 27This is a schematic diagram of the resonant current corresponding to the third resonant mode and the third enhancement mode of an antenna assembly provided in one embodiment. For ease of illustration, Figure 27 (a) in the image is in color. Figure 27 (b) in the middle is Figure 27 The grayscale image of (a) is shown in the simulation diagram. As can be seen from this simulation diagram, the third resonant current I13 corresponding to the third resonant mode flows from the first feed point P1 to the first free end 112; the third enhancement current I23 corresponding to the third enhancement mode flows from the second free end 121 to the second ground end 122.

[0158] In summary, the antenna assembly 10 provided in one embodiment of this application excites the first radio frequency signal and the second radio frequency signal on the same radiator (i.e., the first radiator 110). When the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective case, the frequency band supported by the second radio frequency signal undergoes frequency offset and falls within the range of the first frequency band, thereby increasing the bandwidth of the electronic device 1 to which the antenna assembly 10 is applied in the first frequency band when equipped with a metal protective case.

[0159] When the first frequency band is the GPS L1 band and the second frequency band is the GPS L5 band, both the first radio frequency signal and the second radio frequency signal are excited on the first radiator 110. When the electronic device 1 to which the antenna assembly 10 is applied is wearing a metal protective shell, the GPS L1 band utilizes the radiation capability after the frequency offset of GPS L5, thereby increasing the bandwidth of the electronic device 1 to which the antenna assembly 10 is applied in the GPS L1 band when it is wearing a metal protective shell.

[0160] An embodiment of this application provides an antenna assembly 10 in which a first feed source S1 is electrically connected to a first feed point P1 of a first radiator 110. The first feed source S1 generates a first radio frequency signal and a second radio frequency signal to excite the first radiator 110 to support a first frequency band and a second frequency band. A second feed source S2 is electrically connected to a second feed point P2 of the first radiator 110. The second feed source S2 generates a third radio frequency signal and a fourth radio frequency signal to excite the first radiator 110 to support a third frequency band and a fourth frequency band. Therefore, without increasing the space of the antenna assembly 10, the first radiator 110 can support a first frequency band (such as GPS L1 band), a second frequency band (such as GPS L5 band), a third frequency band (such as WiFi 2.4G band), and a fourth frequency band (such as N78 band), and the performance of the first radiator 110 supporting the first, second, third, and fourth frequency bands does not degrade.

[0161] An antenna assembly 10 provided in one embodiment of this application further includes a first bandpass circuit 130. One end of the first bandpass circuit 130 is connected to the first feed point P1, and the other end of the first bandpass circuit 130 is grounded. The first bandpass circuit 130 is a bandpass circuit for the third frequency band. The first feed point P1 serves as the lower point where the first radiator 110 supports the third radio frequency signal of the third frequency band, implementing wavetrapping. This enables the second feed source S2 to excite a first enhancement mode (also called an auxiliary mode) on the first radiator 110 to support the third frequency band, thereby improving the efficiency of the antenna assembly 10 in the third frequency band (such as the WiFi 2.4G band).

[0162] In one embodiment of this application, the antenna assembly 10, when the electronic device 1 to which the antenna assembly 10 is applied is covered with a metal protective shell, provides a first resonant mode that supports the first frequency band (such as the GPS L1 band). The second radio frequency signal excites the first radiator 110, causing a shift in the frequency band supported by the first radiator 110 compared to the second frequency band. The resonant mode generated by the second radio frequency signal exciting the first radiator 110 can also support at least a portion of the first frequency band. When the antenna assembly 10 further includes a second radiator 120 and a third feed source S3, when the electronic device 1 to which the antenna assembly 10 is applied is covered with a metal protective shell, the fifth radio frequency signal excites the second radiator 120, causing a shift in the frequency band supported by the second radiator 120 compared to the fifth frequency band. The resonant mode generated by the fifth radio frequency signal exciting the second radiator 120 can support at least a portion of the first frequency band. Furthermore, the first feed source S1 is also used to excite a second enhancement mode of the second radiator 120 to support the first frequency band. Therefore, when the antenna assembly 10 supports the first frequency band, multiple resonances can be achieved to support the first frequency band, thereby improving the radiation capability of the antenna assembly 10 in the first frequency band when the electronic device 1 to which the antenna assembly 10 is applied is equipped with a metal protective shell.

[0163] Furthermore, in one embodiment of this application, the antenna assembly 10 provides a third resonant mode that supports a third frequency band (such as the WiFi 2.4G band), and the first enhancement mode also supports the third frequency band. Additionally, the second feed source S2 is used to excite the third enhancement mode of the second radiator 120 to support the third frequency band. Therefore, multiple resonant modes of the antenna assembly 10 all support the third frequency band, improving the radiation capability of the antenna assembly 10 in the third frequency band.

[0164] This application also provides an electronic device 1 according to one embodiment. The electronic device 1 includes, but is not limited to, devices capable of transmitting and receiving electromagnetic wave signals such as mobile phones, telephones, televisions, tablets, personal computers, laptops (PCs), in-vehicle devices, headphones, watches, and wearable devices. In the schematic diagrams of this application embodiment, a mobile phone is used as an example for illustration; it should be understood that this should not be construed as a limitation on the electronic device 1 provided in this application embodiment. Please refer to... Figure 28 and Figure 29 , Figure 28 A schematic diagram of an electronic device provided according to one embodiment of this application; Figure 29 for Figure 28 The diagram shows a partial structural schematic of the electronic device 1. The electronic device 1 includes an antenna assembly 10. The antenna assembly 10 has been described previously and will not be repeated here.

[0165] In summary, the antenna assembly 10 of the electronic device 1 provided in this application has a first feed source S1 used to generate a first radio frequency (RF) signal and a second RF signal. The first feed source S1 is electrically connected to the first feed point P1 of the first radiator 110. Therefore, the first RF signal and the second RF signal are combined to excite the same first radiator 110, enabling the first radiator 110 to support both a first frequency band and a second frequency band. Compared to when the antenna assembly 10 is in a free state, when the electronic device 1 is equipped with a metal protective case, the frequency band supported by the second RF signal induced by the metal protective case is frequency-shifted relative to the second frequency band. When the electronic device 1 is equipped with a metal protective case, the frequency band supported by the second RF signal induced by the first radiator 110 shifts to a higher frequency relative to the second frequency band, thereby causing at least a portion of the frequency band supported by the second RF signal induced by the first radiator 110 to fall into the range of the first frequency band. Therefore, when the electronic device 1 is equipped with a metal protective case, the second radio frequency signal excites the first radiator 110 to support at least a portion of the first frequency band, so that when the electronic device 1 is equipped with a metal protective case, the antenna assembly 10 still has a large bandwidth in the first frequency band, so that the electronic device 1 still has good antenna performance in the first frequency band when equipped with a metal protective case.

[0166] Furthermore, in one embodiment, the electronic device 1 further includes a mid-frame 30. The mid-frame 30 includes a frame body 310 and a side frame portion 320. The frame body 310 is the ground electrode in the electronic device 1. The side frame portion 320 is bent and connected to the periphery of the frame body 310. The first radiator 110 and the second radiator 120 of the antenna assembly 10 are formed in the side frame portion 320.

[0167] Furthermore, in one embodiment, the electronic device 1 further includes a display screen 50 and a battery cover 70. The screen and the battery cover 70 are respectively disposed on opposite sides of the mid-frame 30. It is understood that the electronic device 1 described in this application embodiment is merely a description of one application environment of the antenna assembly 10 and should not be construed as a limitation on the antenna assembly 10 provided in this application embodiment.

[0168] The above description represents some embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. An antenna assembly, characterized in that, The antenna assembly includes: A first radiator, comprising a first grounding terminal, a first feed point, and a first free end sequentially disposed therefrom; and A first feed source, which is used to generate a first radio frequency signal and a second radio frequency signal, and the first feed source is electrically connected to the first feed point; When the antenna assembly is in a free state: the first radio frequency signal is used to excite the first radiator to support the first frequency band, and the second radio frequency signal is used to excite the first radiator to support the second frequency band, wherein the frequency of the second frequency band is less than the frequency of the first frequency band; When the electronic device to which the antenna assembly is applied is covered with a metal protective casing, the second radio frequency signal excites the first radiator to support at least a portion of the first frequency band.

2. The antenna assembly as claimed in claim 1, characterized in that, The first radio frequency signal excites the first resonant mode of the first radiator to support the first frequency band, wherein the first resonant mode is a quarter-wavelength mode of the first radiator; The second radio frequency signal excites the second resonant mode of the first radiator, wherein the second resonant mode is a composite left- or right-handed mode of the first radiator.

3. The antenna assembly as described in claim 1, characterized in that, The first radiator also has a second feed point, which is spaced apart from the first feed point, and the second feed point is closer to the first free end than the first feed point. The antenna assembly further includes a second feed source, which is used to generate a third radio frequency signal and a fourth radio frequency signal. The second feed source is electrically connected to the second feed point. When the antenna assembly is in a free state: the third radio frequency signal excites the first radiator to support the third frequency band, and the fourth radio frequency signal excites the first radiator to support the fourth frequency band, wherein the frequency of the third frequency band is greater than the frequency of the first frequency band, and the frequency of the fourth frequency band is greater than the frequency of the third frequency band.

4. The antenna assembly as described in claim 3, characterized in that, The antenna assembly also includes: The first bandpass circuit has one end electrically connected to the first feed point and the other end grounded. The first bandpass circuit is the bandpass circuit of the third frequency band.

5. The antenna assembly as described in claim 4, characterized in that, The second feed source excites the third resonant mode and the first enhancement mode of the first radiator to support the third frequency band; The resonant current corresponding to the third resonant mode is distributed from the first feed point to the first free end; The resonant current corresponding to the first enhancement mode is distributed between the first ground terminal and the first feed point, and the resonant current corresponding to the first enhancement mode flows in the same direction as the resonant current corresponding to the third resonant mode.

6. The antenna assembly as claimed in claim 4, characterized in that, The first bandpass circuit includes: A first capacitor, one end of which is electrically connected to the first feed point; and The first inductor has one end electrically connected to the other end of the first capacitor, and the other end of the first inductor is grounded.

7. The antenna assembly as claimed in claim 4, characterized in that, The antenna assembly also includes: The second bandpass circuit has one end electrically connected to the first feed point and the other end grounded. The second bandpass circuit is the bandpass circuit of the fourth frequency band.

8. The antenna assembly as claimed in claim 7, characterized in that, The second bandpass circuit includes: The second capacitor has one end electrically connected to the first feed point; The second inductor is connected in parallel with the second capacitor; and The third inductor has one end electrically connected to the other end of the second capacitor, and the other end of the third inductor is grounded.

9. The antenna assembly as claimed in claim 7, characterized in that, The antenna assembly also includes: A first impedance matching circuit is provided, wherein the first feed source is electrically connected to the first impedance matching circuit to the first feed point, and the first impedance matching circuit is used to perform impedance matching between the first feed source and the first radiator.

10. The antenna assembly as claimed in claim 9, characterized in that, The first impedance matching circuit includes: A third capacitor, one end of which is electrically connected to the first feed source; A fourth capacitor, one end of which is electrically connected to the other end of the third capacitor; A fourth inductor, one end of which is electrically connected to the other end of the fourth capacitor, and the other end of which is electrically connected to the first feed point; A fifth capacitor, one end of which is electrically connected to one end of the fourth inductor, and the other end of which is grounded; and The fifth inductor has one end electrically connected to the first end of the fifth inductor and the other end grounded.

11. The antenna assembly as claimed in claim 3, characterized in that, The second feed source excites the fourth resonant mode of the first radiator to support the fourth frequency band; The current corresponding to the fourth resonant mode is distributed from the second feed point to the first free end.

12. The antenna assembly as claimed in claim 3, characterized in that, The antenna assembly also includes: A band-stop circuit is provided, and the second feed source is electrically connected to the band-stop circuit to the second feed point. The band-stop circuit is a band-stop circuit of the first frequency band.

13. The antenna assembly as claimed in claim 12, characterized in that, The band-stop circuit includes: A sixth inductor, one end of which is electrically connected to the second feed source, and the other end of which is electrically connected to the second feed point; and The sixth capacitor is connected in parallel with the sixth inductor.

14. The antenna assembly as claimed in claim 12, characterized in that, The antenna assembly also includes: The second impedance matching circuit is connected in sequence to the second impedance matching circuit and the band-stop circuit to the second feed point. The second impedance matching circuit is used to perform impedance matching on the second feed source and the first radiator.

15. The antenna assembly as claimed in claim 14, characterized in that, The second impedance matching circuit includes: A seventh capacitor, one end of which is electrically connected to the second feed source; An eighth capacitor, one end of which is electrically connected to the other end of the seventh capacitor; A seventh inductor, one end of which is electrically connected to the other end of the eighth capacitor, and the other end of which is electrically connected to the resistive circuit; and The eighth inductor has one end electrically connected to the other end of the seventh inductor, and the other end of the eighth inductor is grounded.

16. The antenna assembly as described in any one of claims 1-15, characterized in that, The antenna assembly also includes: The second radiator includes a second free end, a third feed point, and a second ground end arranged sequentially, wherein the second free end is opposite to the first free end and is provided with a coupling gap, and the second radiator is coupled to the first radiator through the coupling gap; and The third feed source is used to generate a fifth radio frequency signal. The third feed is connected to the third feed point. When the antenna assembly is in a free state, the fifth radio frequency signal excites the second radiator to support the fifth frequency band, and the frequency of the fifth frequency band is greater than the frequency of the first frequency band. When the electronic device to which the antenna assembly is applied is covered with a metal protective shell, the fifth radio frequency signal is used to excite the second radiator to support at least a portion of the first frequency band.

17. The antenna assembly as claimed in claim 16, characterized in that, The first feed source is also used to excite the second enhancement mode of the second radiator to support the first frequency band, wherein the resonant current corresponding to the second enhancement mode is distributed at the second free end and the second ground end; Furthermore, when the first resonant mode supports the first frequency band, and the first resonant current corresponding to the first resonant mode flows from the first grounding point to the first free end, the second enhanced current corresponding to the second enhanced mode flows from the second free end to the second grounding point.

18. The antenna assembly as claimed in claim 16, characterized in that, When the first radiator has a second feed point and the antenna assembly further includes a second feed source, the second feed source is also used to excite the third enhancement mode of the second radiator to support the third frequency band. When the second feed source excites the third resonant mode of the first radiator to support the third frequency band, the resonant current of the third enhancement mode is distributed between the second free end and the second ground end, and the resonant current of the third enhancement mode flows in the same direction as the resonant current of the third resonant mode.

19. The antenna assembly as claimed in claim 18, characterized in that, The antenna assembly also includes: A aperture tuning circuit, one end of which is electrically connected to the third feed point and the other end is grounded, is used to perform aperture tuning on the fifth frequency band so that the frequency of the fifth frequency band is greater than the frequency of the first frequency band.

20. The antenna assembly as claimed in claim 19, characterized in that, The aperture tuning circuit includes: A tuning inductor, one end of which is electrically connected to the third feed point; and An isolation capacitor, one end of which is electrically connected to the other end of the tuning inductor, and the other end of which is grounded.

21. The antenna assembly as claimed in claim 18, characterized in that, The antenna assembly also includes: The third bandpass circuit has one end connected to the third feed point and the other end grounded. The third bandpass circuit is the bandpass circuit for the third frequency band.

22. The antenna assembly as claimed in claim 21, characterized in that, The third bandpass circuit includes: A ninth inductor, one end of which is connected to the third feed point; and The ninth capacitor has one end connected to the other end of the ninth inductor, and the other end of the ninth capacitor is grounded.

23. The antenna assembly as claimed in claim 21, characterized in that, The antenna assembly also includes: The third impedance matching circuit is connected to the third feed point by the third feed source. The third impedance matching circuit is used to perform impedance matching between the third feed source and the second radiator.

24. The antenna assembly as claimed in claim 23, characterized in that, The third impedance matching circuit includes: A tenth inductor, one end of which is electrically connected to the third feed source, and the other end of which is electrically connected to the third feed point; and The tenth capacitor has one end electrically connected to the third feed point and the other end grounded.

25. An electronic device, characterized in that, The electronic device includes an antenna assembly as described in any one of claims 1-24.

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