Antenna assembly and electronic equipment

Abstract

The invention provides an antenna assembly and electronic equipment. The antenna assembly comprises a first antenna, and the first antenna comprises a first radiator, a first feed source and a tuning circuit. The first radiating body is provided with a first free end, a first feeding point, a connecting point and a first grounding end, and the first grounding end is grounded. The first feed source is electrically connected to the first feeding point, the first feed source is used for exciting the first radiator to generate a first resonant mode and a second resonant mode, the first resonant mode is used for supporting a first target frequency band, and the second resonant mode is used for supporting a second target frequency band. The tuning circuit is electrically connected to the connection point, the tuning circuit is further electrically connected to the ground, the tuning circuit is used for conducting aperture tuning on the first target frequency band so that the first radiator can support different first frequency bands in the first target frequency band, and the connection point is located in a voltage zero point area of resonance voltage corresponding to the second resonance mode. The voltage zero point region at least comprises a voltage zero point of the resonance voltage corresponding to the second resonance mode.

Description

Technical Field

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

[0002] With the development of technology, electronic devices with communication functions such as mobile phones are becoming more and more popular and their functions are becoming more and more powerful. Electronic devices usually include antenna components to realize the communication function of electronic devices. However, the communication performance of antenna components in electronic devices in related technologies is not good enough and there is still room for improvement. Summary of the invention

[0003] In a first aspect, the present application provides an antenna assembly, the antenna assembly comprising a first antenna, the first antenna comprising:

[0004] A first radiator, the first radiator having a first free end, a first feeding point, a connection point and a first grounding end, the first grounding end being grounded;

[0005] A first feed source, the first feed source is electrically connected to the first feeding point, and the first feed source is used to excite the first radiator to generate a first resonance mode and a second resonance mode, wherein the first resonance mode is used to support a first target frequency band, and the second resonance mode is used to support a second target frequency band; and

[0006] A tuning circuit, wherein the tuning circuit is electrically connected to the connection point, and the tuning circuit is also electrically connected to the ground, and the tuning circuit is used to perform aperture tuning on the first target frequency band so that the first radiator supports different first frequency bands in the first target frequency band, wherein the connection point is located in a voltage zero point region of the resonant voltage corresponding to the second resonant mode, and the voltage zero point region at least includes the voltage zero point of the resonant voltage corresponding to the second resonant mode.

[0007] In a second aspect, the present application provides an electronic device, comprising the antenna assembly as described in the first aspect.

[0008] In summary, in the antenna assembly provided in the embodiment of the present application, the first radiator can support the first resonant mode and the second resonant mode. Therefore, the first antenna can support the first target frequency band and the second target frequency band, so that the first antenna can support more frequency bands and has better communication performance. Furthermore, in the antenna assembly provided in the embodiment of the present application, the tuning circuit is electrically connected to the connection point, and the first target frequency band can be aperture tuned, so that the first radiator supports different first frequency bands of the first target frequency band, so that the first antenna can accurately operate in the corresponding first frequency band in the first target frequency band. Furthermore, in the antenna assembly provided in the embodiment of the present application, the position of the connection point is located in the voltage zero point area of ​​the resonant voltage corresponding to the second resonant mode. When the tuning circuit performs aperture tuning on the first target frequency band, the second target frequency band is less affected or even has no effect on the second target frequency band. It can be seen from this that the first radiator of the first antenna in the antenna assembly provided in the embodiment of the present application can not only support different first frequency bands of the first target frequency band, but also when the tuning circuit tunes the first target frequency band so that the first radiator supports different first frequency bands, it has little or no impact on the second target frequency band, so that the first antenna also has good communication performance in the second target frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 A schematic diagram of an antenna assembly provided in one embodiment of the present application;

[0011] Figure 2 for Figure 1 A schematic diagram of a voltage null region in an antenna assembly shown in ;

[0012] Figure 3 for Figure 1 A schematic diagram of the total length of the first radiator in the antenna assembly shown in ;

[0013] Figure 4 A schematic diagram of a voltage zero point region of an antenna assembly provided in another embodiment of the present application;

[0014] Figure 5 for Figure 1 Schematic diagram of the dimensions of some components of the antenna assembly shown in;

[0015] Figure 6A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0016] Figure 7 A schematic diagram of an antenna assembly provided in yet another embodiment of the present application;

[0017] Figure 8 for Figure 6 Schematic diagram of S parameters of the antenna assembly shown in;

[0018] Fig. 9 for Figure 1 A schematic diagram of current distribution corresponding to the first resonant mode in the antenna assembly shown;

[0019] Fig.10 for Figure 1 A schematic diagram of current distribution corresponding to the second resonant mode in the antenna assembly shown;

[0020] Fig.11 for Figure 6 A schematic diagram of current distribution corresponding to the third resonance mode in the antenna assembly shown;

[0021] Fig.12 for Figure 6 A schematic diagram of current distribution corresponding to the fourth resonance mode in the antenna assembly shown;

[0022] Fig.13 for Figure 6 A schematic diagram of current distribution corresponding to the fifth resonant current in the antenna assembly shown in ;

[0023] Fig.14 A three-dimensional schematic diagram of an electronic device provided in one embodiment;

[0024] Fig.15 for Fig.14 Schematic diagram of the partial structure of the electronic equipment in.

[0025] Description of main component numbers:

[0026] Electronic device 1, antenna assembly 10, middle frame 30, display screen 70, housing 90;

[0027] A first antenna 100, a first radiator 110, a first radiating portion 110a, a second radiating portion 110b, a first feed source S1, a tuning circuit 120, and a band-stop filter circuit 130;

[0028] A first free end 111, an end surface 111a, a first feeding point P1, a connection point P2, a first grounding end 112, and a voltage zero point region 110c;

[0029] The second antenna 200, the second radiator 210, the coupling gap 210a, the second free end 211, the second feeding point P3, and the second ground end 212;

[0030] Frame body 310 , frame 320 , first frame 321 , second frame 322 , outer surface 320 a , first gap 320 b , second gap 320 c . DETAILED DESCRIPTION

[0031] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

[0032] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0033] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but optionally includes one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0034] See also Figure 1 , Figure 1A schematic diagram of an antenna assembly provided for one embodiment of the present application. The antenna assembly 10 includes a first antenna 100. The first antenna 100 includes a first radiator 110, a first feed source S1, and a tuning circuit 120. The first radiator 110 has a first free end 111, a first feeding point P1, a connection point P2, and a first grounding terminal 112. The first grounding terminal 112 is grounded. The first feed source S1 is electrically connected to the first feeding point P1, and the first feed source S1 is used to excite the first radiator 110 to generate a first resonant mode and a second resonant mode. The first resonant mode is used to support a first target frequency band, and the second resonant mode is used to support a second target frequency band. The tuning circuit 120 is electrically connected to the connection point P2, and the tuning circuit 120 is also electrically connected to the ground. The tuning circuit 120 is used to perform aperture tuning on the first target frequency band so that the first radiator 110 supports different first frequency bands in the first target frequency band, wherein the connection point P2 is located in the voltage zero point region 110c of the resonant voltage corresponding to the second resonant mode, and the voltage zero point region 110c at least includes the voltage zero point of the resonant voltage corresponding to the second resonant mode.

[0035] The first radiator 110 can be a laser direct structuring (LDS) radiator, or a flexible printed circuit (FPC) radiator, or a print direct structuring (PDS) radiator, or a metal branch radiator. When the antenna assembly 10 is applied to an electronic device 1, the first radiator 110 can be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the first radiator 110 can be an antenna radiator designed using the middle frame 30 formed of plastic and metal of the electronic device 1. In addition, the first radiator 110 can also be a metal frame antenna radiator designed using a metal middle frame 30.

[0036] It is understandable that the present application does not specifically limit the shape, structure and material of the first radiator 110. The shapes of the first radiator 110 include but are not limited to bent, straight, L-shaped, sheet, rod, coating, film, etc. When the first radiator 110 is in a strip shape, the present application does not limit the extension trajectory of the first radiator 110, so the first radiator 110 can be extended in a straight line, a curve, a multi-stage bend, etc. The first radiator 110 can be a line with uniform width on the extension trajectory, or it can be an irregular shape with different widths such as a gradual width and a widened area. In the schematic diagram of this embodiment, the first radiator 110 extends along a straight line trajectory. It is understandable that the first radiator 110 shown in the schematic diagram of this embodiment should not be understood as a limitation of the first radiator 110 provided in the embodiment of the present application.

[0037] The first radiator 110 has two ends, one of which is a free end, named as the first free end 111, and the other end is a ground end, named as the first ground end 112. In one embodiment, the first ground end 112 can be electrically connected to a ground electrode (also called a floor, or a ground system, or a system ground) through a grounding structure such as a conductive spring, a conductive connecting rib (such as a metal connecting rib), or a top pin connector (POP-pin) to be grounded. When the antenna assembly 10 is applied to an electronic device 1, the ground electrode can be, but is not limited to, the electronic device 1 (see Fig.14 and Fig.15 ) in the frame body 310 of the middle frame 30, or the ground in the circuit board, or the shielding part of the display screen 70, or the conductive battery cover, etc. In another embodiment, when the antenna assembly 10 is applied to the electronic device 1, and the first radiator 110 is an MDA radiator or a metal frame antenna radiator, the situation where the first ground terminal 112 is grounded is specifically described as follows. The electronic device 1 includes a middle frame 30. The middle frame 30 includes a frame body 310 and a frame 320. The frame body 310 can be used as a ground pole, and the frame 320 is surrounded by the periphery of the frame body 310 and connected to the frame body 310. The first radiator 110 is formed in the frame 320, and one end of the first radiator 110 is connected to the frame body 310, and the end of the first radiator 110 connected to the frame body 310 is the first ground terminal 112 of the first radiator 110.

[0038] The first feed source S1 may be located on a circuit board. The first feed source S1 is used to generate a first excitation signal. The first feed source S1 is electrically connected to the first feed point P1 by, but not limited to, a conductive spring, a conductive connecting rib (such as a metal connecting rib), or a POP-pin or other electrically conductive member connected to the first feed point P1.

[0039] The first feed source S1 is used to excite the first radiator 110 to support the first resonance mode, and the first resonance mode supports the first target frequency band. In this embodiment, the first target frequency band is a low frequency (Low Band, LB) band. The first target frequency band includes multiple working frequency bands. For the convenience of description, the working frequency band in the first target frequency band is named the first frequency band. In other words, the first target frequency band includes multiple first frequency bands. When the first target frequency band is the LB band, the multiple first frequency bands include B5 band, B8 band and B28 band, etc.

[0040] The second resonant mode supports the second target frequency band, and the second resonant mode is generated by the excitation of the first feed source S1. In this embodiment, the second target frequency band is a middle band (MB) frequency band. When the second target frequency is the MB frequency band, the second target frequency band may also include one or more working frequency bands, such as a B3 frequency band and a B1 frequency band.

[0041] The connection point P2 is spaced apart from the first feeding point P1. In this embodiment, the connection point P2 is closer to the first ground terminal 112 than the feeding point.

[0042] The tuning circuit 120 may be connected to the connection point P2 through, but not limited to, conductive springs, conductive connecting ribs (such as metal connecting ribs), or pop-pin connectors and other electrically conductive members.

[0043] The tuning circuit 120 is used to perform aperture tuning on the first target frequency band so that the first radiator 110 supports different first frequency bands in the first target frequency band. Specifically, the tuning circuit 120 supports different first frequency bands in the first target frequency band according to different preset tuning parameters. For example, when the tuning circuit 120 has a first tuning parameter, the first radiator 110 supports a first frequency band a in the first target frequency band; when the tuning circuit 120 has a second tuning parameter, the first radiator 110 supports a first frequency band b in the first target frequency band.

[0044] When the first radiator 110 supports the first resonance mode, the first radiator 110 has a first resonance current. Accordingly, the first resonance current corresponds to a first resonance voltage. When the first radiator 110 supports the second resonance mode, the first radiator 110 has a second resonance current. Accordingly, the second resonance current corresponds to a second resonance voltage.

[0045] The connection point P2 is located in the voltage zero point area 110c of the resonant voltage corresponding to the second resonant mode. The voltage zero point area 110c includes the voltage zero point of the resonant voltage corresponding to the second resonant mode. In other embodiments, the voltage zero point area 110c also includes an area close to the voltage zero point. The specific situation will be described in detail later.

[0046] The voltage zero point usually corresponds to the current strong point, and the connection point P2 is located at the voltage zero point of the resonant voltage corresponding to the second resonant mode, that is, the connection point P2 is located at the voltage zero point of the second resonant voltage, that is, the connection point P2 is located at the current strong point of the second resonant current (that is, the current maximum value of the second resonant current).

[0047] If the connection point P2 is located outside the voltage zero point region 110c of the resonant voltage corresponding to the second resonant mode, when the tuning circuit 120 performs aperture tuning on the first target frequency band, the second target frequency band will be frequency-deviation-prone and cannot operate in the second target frequency band required by the antenna assembly 10, resulting in poor communication performance when the antenna assembly 10 is used for operation.

[0048] The connection point P2 is located in the voltage zero point region 110c of the resonant voltage corresponding to the second resonant mode. Therefore, when the tuning circuit 120 performs aperture tuning on the first target frequency band, the second target frequency band is less affected or even has no effect on the second target frequency band.

[0049] It should be noted that the tuning circuit 120 is used to perform aperture tuning on the first target frequency band. Therefore, the position of the connection point P2 is located in the non-voltage zero point region of the first target frequency band, that is, the connection point P2 is located outside the voltage zero point region of the first target frequency band. Therefore, the tuning circuit 120 electrically connected to the connection point P2 can tune the first target frequency band.

[0050] In summary, in the antenna assembly 10 provided in the embodiment of the present application, the first radiator 110 can support the first resonant mode and the second resonant mode, so that the first antenna 100 can support the first target frequency band and the second target frequency band, so that the first antenna 100 can support more frequency bands and has better communication performance. Further, in the antenna assembly 10 provided in the embodiment of the present application, the tuning circuit 120 is electrically connected to the connection point P2, and the first target frequency band can be caliber tuned, so that the first radiator 110 supports different first frequency bands of the first target frequency band, so that the first antenna 100 can accurately work in the first target frequency band. The corresponding first frequency band. Further, in the antenna assembly 10 provided in the embodiment of the present application, the position of the connection point P2 is located in the voltage zero point region 110c of the resonant voltage corresponding to the second resonant mode. When the tuning circuit 120 performs caliber tuning on the first target frequency band, the second target frequency band is less affected or even does not affect the second target frequency band. It can be seen that the first radiator 110 of the first antenna 100 in the antenna assembly 10 provided in the embodiment of the present application can not only support different first frequency bands of the first target frequency band, but also when the tuning circuit 120 tunes the first target frequency band so that the first radiator 110 supports different first frequency bands, it has little or no impact on the second target frequency band, so that the first antenna 100 also has good communication performance in the second target frequency band.

[0051] Further, in one embodiment, the first resonance mode is a quarter wavelength mode from the first free end 111 to the first ground end 112 of the first radiator 110 , and the second resonance mode is a three quarter wavelength mode from the first free end 111 to the first ground end 112 .

[0052] The first resonant mode is a quarter-wavelength mode from the first free end 111 of the first radiator 110 to the first ground end 112, that is, the first resonant mode is a quarter-wavelength mode of the entire branch of the first radiator 110. The quarter-wavelength mode is also called the fundamental mode. When the first radiator 110 supports the first target frequency band, it works in the fundamental mode. When the first radiator 110 supports the first target frequency band, it works in the fundamental mode and has a higher radiation efficiency. It should be noted that the "wavelength" in the quarter-wavelength mode from the first free end 111 of the first radiator 110 to the first ground end 112 refers to the wavelength corresponding to the center frequency of the first target frequency band corresponding to the first resonant mode.

[0053] The second resonant mode is a three-quarter wavelength mode from the first free end 111 to the first ground end 112, that is, the second resonant mode is a three-quarter wavelength mode of the entire branch of the first radiator 110. It can be seen that the second resonant mode is three times the frequency of the first resonant mode. That is, the wavelength mode supporting the second target frequency band is three times the frequency of the wavelength mode supporting the first target frequency band. It should be noted that the "wavelength mode" in the three-quarter wavelength mode from the first free end 111 to the first ground end 112 of the second resonant mode refers to the wavelength corresponding to the center frequency point of the second target frequency band corresponding to the second resonant mode.

[0054] The antenna assembly 10 provided in the embodiment of the present application can utilize the three-quarter wavelength mode of the entire branch of the first radiator 110 to support the second target frequency band, so that the first radiator 110 can support the second target frequency band. In other words, the antenna assembly 10 provided in the embodiment of the present application can fully utilize the wavelength mode of the first radiator 110, so that the first radiator 110 can support both the first target frequency band and the second target frequency band, so that the first antenna 100 can support more frequency bands and has a better communication effect.

[0055] Please combine Figure 1 , and also see Figure 2 and Figure 3 , Figure 2 for Figure 1 A schematic diagram of a voltage null region in an antenna assembly shown in ; Figure 3 for Figure 1 The total length schematic diagram of the first radiator in the antenna assembly shown in FIG. The distance d between each point in the voltage zero point area 110c and the voltage zero point O 0 Satisfies: 0≤d 0 ≤L 1 / 10, where L 1 is the total length of the first radiator 110 .

[0056] In this embodiment, the first radiator 110 includes a first radiating portion 110a and a second radiating portion 110b that are connected by bending. The end of the first radiating portion 110a that is away from the connection between the first radiating portion 110a and the second radiating portion 110b is the first free end 111; correspondingly, the end of the second radiating portion 110b that is away from the connection is the first grounding end 112. In other words, the first free end 111 is located at the first radiating portion 110a, and the first grounding end 112 is located at the second radiating portion 110b.

[0057] In this embodiment, the length of the first radiation portion 110a is L 11 , the length of the second radiation portion 110b is L 12 , the total length of the first radiator 110 is L 1 , satisfying: L 1 =L 11 +L 12 .

[0058] When the second resonance mode is certain, the voltage zero point of the resonance voltage corresponding to the second resonance mode is determined. The distance between each point of the voltage zero point region 110c and the voltage zero point region 110c satisfies 0≤d 0 ≤L 1 / 10, that is, the voltage zero point area 110c is centered at the voltage zero point and R=L 1 / 10 is the radius of the area.

[0059] The antenna assembly 10 provided in this embodiment has a distance d between each point in the voltage zero point area 110c and the voltage zero point. 0 Satisfies: 0≤d 0 ≤L 1 / 10, when the tuning circuit 120 performs aperture tuning on the first target frequency band, it has little impact on the second target frequency band or even has no impact on the second target frequency band, so that the antenna assembly 10 has good communication performance in both the first target frequency band and the second target frequency band.

[0060] Understandably, in Figure 1 and Figure 2 In the figure, the voltage zero point area 110c is taken as a circle for illustration. It can be understood that in other embodiments, the voltage zero point area 110c can also be other shapes.

[0061] See also Figure 4 , Figure 4 A schematic diagram of a voltage zero point region of an antenna assembly provided in another embodiment of the present application. Since the width of the first radiator 110 is usually small, to a certain extent, the voltage zero point region 110c can also be considered to be centered at the voltage zero point O and centered at D=2L. 1 / 10 is one side (for example, the long side) of the rectangle, and the width of the first radiator 110 is a rectangular area of ​​the other side (for example, the short side) of the rectangle.

[0062] The antenna assembly 10 provided in this embodiment, the voltage zero point area 110c is centered at the voltage zero point O and is centered at D=2L 1 / 10 is one side of the rectangle (for example, the long side), and the width of the first radiator 110 is the other side of the rectangle (for example, the short side). When the tuning circuit 120 performs aperture tuning on the first target frequency band, the second target frequency band is less affected or even has no effect on the second target frequency band.

[0063] In one embodiment, when the antenna assembly 10 is applied to an electronic device 1 such as a mobile phone, the total length of the first radiator 110 is generally 40 mm to 50 mm.

[0064] It can be understood that when the first radiator 110 is a straight strip radiator, the total length of the first radiator 110 is the length of the first radiator 110 in the extension direction; when the first radiator 110 includes a plurality of radiating parts connected by bending, the extension directions of each radiating part are different, then the total length of the first radiator 110 is the sum of the lengths of each radiating part, and the length of each radiating part is the size of each radiating part along its own extension direction.

[0065] See also Figure 5 , Figure 5 for Figure 1 The first free end 111 has an end surface 111a located on the side of the first feeding point P1 away from the connection point P2. The distance d between the end surface 111a and the connection point P2 is 1 Satisfaction: [(1 / 3)-(1 / 10)]L 1 ≤d 1 ≤[(1 / 3)+(1 / 10)]L 1 , where L 1 is the total length of the first radiator 110 .

[0066] The distance d between the end surface 111a and the connection point P2 1 Satisfaction: [(1 / 3)-(1 / 10)]L 1 ≤d 1 ≤[(1 / 3)+(1 / 10)]L 1 , that is, 7L 1 / 10≤d 1 ≤13L 1 In one embodiment, the distance d between the end surface 111a and the connection point P2 is 1 =(1 / 3)L 1 , that is, d 1 =L 1Since the second resonance mode is a three-quarter wavelength mode from the first free end 111 to the first ground end 112, the distance from the voltage zero point of the resonance voltage corresponding to the second resonance mode to the end surface 111a is equal to or substantially equal to L 1 / 3. The distance d between the end surface 111a and the connection point P2 1 Satisfaction: [(1 / 3)-(1 / 10)]L 1 ≤d 1 ≤[(1 / 3)+(1 / 10)]L 1 , when the tuning circuit 120 performs aperture tuning on the first target frequency band, the second target frequency band is less affected or even has no effect on the second target frequency band, so that the antenna assembly 10 has good communication performance in both the first target frequency band and the second target frequency band.

[0067] Please read further Figure 3 , the total length of the first radiator 110 satisfies: L 1 >L 0 , where L 0 The length required for the first radiator 110 to support a quarter-wavelength mode of the first target frequency band. The tuning circuit 120 is also used to adjust the electrical length of the first radiator 110 so that the first radiator 110 generates the first resonant mode.

[0068] In this embodiment, the first radiator 110 includes a first radiating portion 110a and a second radiating portion 110b that are connected by bending. The first free end 111 is located at the first radiating portion 110a, and the first grounding end 112 is located at the second radiating portion 110b. The total length L of the first radiator 110 is 1 is equal to the length L of the first radiating portion 110a 11 The length L of the second radiation portion 110b 12 The sum of L 1 =L 11 +L 12 It should be noted that the total length of the first radiator 110 refers to the total physical length of the first radiator 110. The length of the first radiating portion 110a also refers to the physical length of the first radiating portion 110a, and the length of the second radiating portion 110b also refers to the physical length of the second radiating portion 110b.

[0069] Since the first radiator 110 supports the quarter-wavelength mode of the first target frequency band, the electrical length L of the first radiator 110 is 0 ’When L is a quarter wavelength of the center frequency of the first target frequency band, the electrical length of the first radiator 110 matches the quarter wavelength mode of the first target frequency band supported by the first radiator 110. Generally speaking, when the material of the radiator is constant, the relationship between the electrical length of the radiator and the physical length of the radiator is uniquely determined. Therefore, the electrical length L of the first radiator 110 is 0 ’ When the electrical length L of the first radiator 110 is one quarter of the wavelength of the center frequency of the first target frequency band, 0 ’ The corresponding physical length is L 0 It is certain.

[0070] When the total length of the first radiator 110 satisfies: L 1 >L 0 , indicating the total length L of the first radiator 110 1 The length L required by the first radiator 110 to support the quarter-wavelength mode 0 In terms of the total length L of the first radiator 110 1 It can also be concluded that the electrical length of the first radiator 110 is greater than the electrical length of the quarter-wavelength mode of the first radiator 110 supporting the first target frequency band.

[0071] In this embodiment, the first tuning circuit 120 tunes the electrical length of the first radiator 110 so that the electrical length of the first radiator 110 after tuning matches the first resonance mode supported by the first radiator 110, so that the first radiator 110 works better in the first resonance mode, thereby making the first target frequency band have a better communication effect.

[0072] See also Figure 6 , Figure 6A schematic diagram of an antenna assembly provided for another embodiment of the present application. In this embodiment, the antenna assembly 10 further includes a second antenna 200. The antenna assembly 10 further includes a second antenna 200 which can be combined with the antenna assembly 10 provided in any of the previous embodiments. The second antenna 200 is described in detail below. The second antenna 200 includes a second radiator 210 and a second feed source S2. The second radiator 210 has a second free end 211, a second feeding point P3 and a second grounding terminal 212. The second free end 211 is opposite to the first free end 111 and is arranged at intervals to form a coupling gap 210a, the second radiator 210 is coupled to the first radiator 110 through the coupling gap 210a, and the second grounding terminal 212 is grounded. The second feed source S2 is electrically connected to the second feeding point P3, and the second feed source S2 is used to excite the second radiator 210 to support a third target frequency band, wherein the third target frequency band includes the second target frequency band.

[0073] The second radiator 210 can be a laser direct structuring (LDS) radiator, or a flexible printed circuit (FPC) radiator, or a print direct structuring (PDS) radiator, or a metal branch radiator. When the antenna assembly 10 is applied to an electronic device 1, the second radiator 210 can be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the second radiator 210 can be an antenna radiator designed using the middle frame 30 formed of plastic and metal of the electronic device 1. In addition, the second radiator 210 can also be a metal frame antenna radiator designed using a metal middle frame 30.

[0074] It is understandable that the present application does not specifically limit the shape, structure and material of the second radiator 210. The shapes of the second radiator 210 include but are not limited to bent, straight, L-shaped, sheet, rod, coating, film, etc. When the second radiator 210 is in a strip shape, the present application does not limit the extension trajectory of the second radiator 210, so the second radiator 210 can extend in a straight line, a curve, a multi-stage bend, etc. The second radiator 210 can be a line with uniform width on the extension trajectory, or it can be an irregular shape with different widths such as a gradual width and a widened area. In the schematic diagram of the present embodiment, the second radiator 210 extends along a straight line trajectory. It is understandable that the second radiator 210 shown in the schematic diagram of the present embodiment should not be understood as a limitation of the second radiator 210 provided in the embodiment of the present application.

[0075] The second radiator 210 has two ends, one of which is a free end, named as the second free end 211, and the other end is a ground end, named as the second ground end 212. In one embodiment, the second ground end 212 can be electrically connected to the ground electrode (also called floor, ground system, or system ground) through a grounding structure such as a conductive spring, a conductive connecting rib (such as a metal connecting rib), or a top pin connector (POP-pin) to be grounded. When the antenna assembly 10 is applied to an electronic device 1, the ground electrode can be but is not limited to the frame body 310 of the middle frame 30 in the electronic device 1, or the ground in the circuit board, or the shielding part of the display screen 70, or a conductive battery cover, etc. In another embodiment, when the antenna assembly 10 is applied to the electronic device 1, and the second radiator 210 is an MDA radiator or a metal frame antenna radiator, the grounding of the second ground end 212 is specifically described as follows. The electronic device 1 includes a middle frame 30. The middle frame 30 includes a frame body 310 and a frame 320. The frame body 310 can be used as a ground pole, and the frame 320 is disposed around the periphery of the frame body 310 and connected to the frame body 310. The second radiator 210 is formed on the frame 320, and one end of the second radiator 210 is connected to the frame body 310, and the one end of the second radiator 210 connected to the frame body 310 is the second ground end 212 of the second radiator 210.

[0076] The second feed source S2 may be located on a circuit board. The second feed source S2 is used to generate a second excitation signal. The second feed source S2 may be electrically connected to the second feed point P3 by, but is not limited to, a conductive spring, a conductive connecting rib (such as a metal connecting rib), or a POP-pin or other electrically conductive member connected to the second feed point P3.

[0077] The second feed source S2 is used to excite the second radiator 210 to support the third target frequency band. In this embodiment, the first target frequency band is a low frequency (Low Band, LB) band, the second target frequency band is a middle frequency (Middle Band, MB) band, and the third target frequency band is a middle high frequency (Middle High Band, MHB) band.

[0078] The second feed source S2 is electrically connected to the second feeding point P3, and the second feed source S2 is used to excite the second radiator 210 to support the third target frequency band. Therefore, the antenna assembly 10 can support the first target frequency band and the third target frequency band, can support more frequency bands, and has better communication performance.

[0079] Furthermore, since the third target frequency band includes the second target frequency band, the second target frequency band supported by the first radiator 110 can expand the bandwidth of the third target frequency band, thereby enabling the antenna assembly 10 to have better communication performance in the third target frequency band.

[0080] See also Figure 7 , Figure 7 A schematic diagram of an antenna assembly provided for another embodiment of the present application. In this embodiment, the antenna assembly 10 includes a first antenna 100 and a second antenna 200. The first antenna 100 can refer to the description of the previous embodiments, which will not be repeated here. The antenna assembly 10 including the second antenna 200 can be combined with the antenna assembly 10 including the first antenna 100. The second antenna 200 can refer to the description of the previous embodiments, which will not be repeated here. Further, in this embodiment, the first antenna 100 also includes a band-stop filter circuit 130. The first feed source S1 electrically connects the band-stop filter circuit 130 to the first feeding point P1, and the band-stop filter circuit 130 resonates at the third target frequency band.

[0081] Compared to the antenna assembly 10 without the band-stop filter circuit 130, the first feed source S1 electrically connects the band-stop filter circuit 130 to the first feeding point P1, and the band-stop filter circuit 130 resonates in the third target frequency band to enhance the isolation between the first antenna 100 and the second antenna 200, thereby reducing or even avoiding the influence of the first antenna 100 on the efficiency of the second antenna 200.

[0082] Specifically, if the first antenna 100 does not include the band-stop filter circuit 130, the energy of the second feed source S2 will be absorbed by the first feed source S1 when coupled to the first radiator 110 via the second radiator 210, thereby affecting the efficiency of the second antenna 200. In the antenna assembly 10 provided in the embodiment of the present application, the first antenna 100 also includes the band-stop filter circuit 130 to reduce or even avoid the energy of the second feed source S2 being absorbed by the first feed source S1 when coupled to the first radiator 110 via the second radiator 210, thereby reducing or even avoiding the influence of the first antenna 100 on the efficiency of the second antenna 200.

[0083] See also Figure 8 , Figure 8 for Figure 6The S parameter diagram of the antenna assembly shown in FIG. In this diagram, the horizontal axis is the frequency, the unit is GHz; the vertical axis is the S parameter (S parameter), the unit is dB. Wherein, curve ① is the S parameter curve (S1,1) of the first antenna 100 in the antenna assembly 10, and curve ② is the S parameter curve (S2,2) of the second antenna 200 in the antenna assembly 10. Wherein, the first resonant mode is represented by mode 1 in the figure, the second resonant mode is represented by mode 2 in the figure, the third resonant mode is represented by mode 3 in the figure, the fourth resonant mode is represented by mode 4 in the figure, and the fifth resonant mode is represented by mode 5 in the figure. It can be seen from curve ① that the first antenna 100 has a first resonant mode and a second resonant mode, wherein the first target frequency band supported by the first resonant mode is the LB frequency band, and the second target frequency band supported by the second resonant mode is the MB frequency band. It can be seen from curve ② that the second feed source S2 is used to excite the second radiator 210 to generate the third resonant mode, the fourth resonant mode and the fifth resonant mode. The third resonant mode, the fourth resonant mode and the fifth resonant mode are used together to support the third target frequency band.

[0084] In this embodiment, the third target frequency band is the MHB frequency band. The second feed source S2 excites the second radiator 210 to generate a third resonance mode, a fourth resonance mode, and a fifth resonance mode. The third resonance mode, the fourth resonance mode, and the fifth resonance mode are used together to support the third target frequency band, so the bandwidth of the third target frequency band is relatively wide. When the antenna assembly 10 communicates using the third target frequency band, it has better communication quality.

[0085] The third target frequency band includes multiple second frequency bands, and carrier aggregation (CA) of the third target frequency band is implemented.

[0086] The resonant frequency point of the second frequency band supported by the third resonant mode is f 21 , the resonant frequency point of the second frequency band supported by the fourth resonant mode is f 22 , the resonant frequency point of the second frequency band supported by the fifth resonant mode is f 23 , where f 21 <f 22 <f 23 .

[0087] The third target frequency band includes multiple working frequency bands. For the convenience of description, the working frequency band in the third target frequency band is named as the second frequency band. In other words, the third target frequency band includes multiple second frequency bands. When the third target frequency band is the MHB frequency band, the multiple second frequency bands include the B1 frequency band, the B3 frequency band, the B40 frequency band, the B41 frequency band, the WIFI2.4G frequency band, etc.

[0088] Depend on Figure 8 It can be seen that the third target frequency band has a large bandwidth, and the third target frequency band includes multiple second frequency bands, so the coexistence of multiple second frequency bands in the third target frequency band can be achieved, and carrier aggregation (CA) of the third target frequency band is achieved. Therefore, the antenna assembly 10 has better communication performance in the third target frequency band.

[0089] Please continue reading Figure 8 , the reflection coefficient of the resonant frequency point of the second frequency band supported by the third resonant mode is the first reflection coefficient S 1 The reflection coefficient of the resonant frequency point of the second frequency band supported by the fourth resonant mode is the second reflection coefficient S 2 The reflection coefficient of the resonant frequency point of the second frequency band supported by the fifth resonant mode is the third reflection coefficient S 3 , where S 1 <S 2 , S 3 <S 2 , the second target frequency band at least partially overlaps with the second frequency band supported by the fourth resonance mode.

[0090] Depend on Figure 8 As shown, in this embodiment, compared with the second frequency band supported by the third resonance mode and compared with the second frequency band supported by the fifth resonance mode, the reflection coefficient of the second frequency band supported by the fourth resonance mode is the largest (i.e., the performance is the worst), and at least part of the second target frequency band overlaps with the second frequency band supported by the fourth resonance mode. Therefore, the second target frequency band can supplement the second frequency band supported by the fourth resonance mode, so that the antenna assembly 10 has a better gain in supporting the second frequency band supported by the fourth resonance mode and has better communication performance.

[0091] Next, the current distributions corresponding to the first resonance mode, the second resonance mode, the third resonance mode, the fourth resonance mode and the fifth resonance mode are illustrated. Fig. 9 for Figure 1 A schematic diagram of current distribution corresponding to the first resonant mode in the antenna assembly is shown. Fig.10 for Figure 1 A schematic diagram of current distribution corresponding to the second resonant mode in the antenna assembly shown; Fig.11 for Figure 6 A schematic diagram of current distribution corresponding to the third resonance mode in the antenna assembly shown; Fig.12 for Figure 6 A schematic diagram of current distribution corresponding to the fourth resonance mode in the antenna assembly shown; Fig.13 for Figure 6 Schematic diagram of current distribution corresponding to the fifth resonant current in the antenna assembly shown in FIG. In each simulation diagram, the first ground terminal 112 and the second ground terminal 212 are electrically connected to the ground electrode 40. Fig. 9 It can be seen that the first resonance mode is a quarter-wavelength mode from the first free end 111 to the first ground end 112 of the first radiator 110. Fig.10 It can be seen that the second resonance mode is a three-quarter wavelength mode from the first free end 111 to the first ground end 112. Fig.11 It can be seen that the third resonance mode is a quarter-wavelength mode from the second ground end 212 to the second free end 211 of the second radiator 210. Fig.12 It can be seen that the fourth resonance mode is a three-quarter wavelength mode from the first free end 111 to the first ground end 112 of the first radiator 110. Fig.13 It can be seen that the fifth resonance mode is a quarter-wavelength mode from the second feeding point P3 to the second free end 211 .

[0092] The third resonant mode is a quarter-wavelength mode from the second ground end 212 to the second free end 211 of the second radiator 210, that is, the third resonant mode is a quarter-wavelength mode of the entire branch of the second radiator 210. The quarter-wavelength mode is also called the fundamental mode. When the second radiator 210 supports the third resonant mode and works in the fundamental mode, it has better radiation efficiency. It should be noted that the "wavelength" in the third resonant mode being a quarter-wavelength mode from the second ground end 212 to the second free end 211 of the second radiator 210 refers to the wavelength corresponding to the center frequency of the second frequency band corresponding to the third resonant mode.

[0093] The fourth resonance mode is a three-quarter wavelength mode from the first free end 111 to the first ground end 112 of the first radiator 110. The first radiator 110 is coupled to the second radiator 210 through the coupling gap 210a and serves as a coupling branch of the second radiator 210.

[0094] The fifth resonant mode is a quarter-wavelength mode from the second feeding point P3 to the second free end 211, that is, the fundamental mode from the second feeding point P3 to the second free end 211 supports the fifth resonant mode. The quarter-wavelength mode is also called the fundamental mode, and the fifth resonant mode is a quarter-wavelength mode from the second feeding point P3 to the second free end 211. Therefore, the second frequency band supported by the fifth resonant mode has good radiation efficiency. It should be noted that the "wavelength" in the quarter-wavelength mode from the second feeding point P3 to the second free end 211 of the fifth resonant mode refers to the wavelength corresponding to the center frequency of the second frequency band corresponding to the fifth resonant mode.

[0095] Further, in this embodiment, the third resonance mode supports the B3 frequency band, the fourth resonance mode supports the B1 frequency band, and the fifth resonance mode supports the B40 frequency band and the B41 frequency band.

[0096] Specifically, in this embodiment, the third target frequency band is the MHB frequency band, the second frequency band supported by the third resonance mode includes the B3 frequency band, the second frequency band supported by the fourth resonance mode includes the B1 frequency band, and the frequency band supported by the fifth resonance mode includes the B40 frequency band and the B41 frequency band.

[0097] The third resonance mode supports the B3 frequency band, the fourth resonance mode supports the B1 frequency band, and the fifth resonance mode supports the B40 frequency band and the B41 frequency band. Therefore, the second antenna 200 can support the B3 frequency band, the B1 frequency band, the B40 frequency band and the B41 frequency band, and can meet the needs of electronic devices 1 such as mobile phones for the above-mentioned frequency bands.

[0098] In summary, the antenna assembly 10 provided in one embodiment of the present application includes a tuning circuit 120, and the tuning circuit 120 can perform aperture tuning on the first target frequency band, so that the first radiator 110 can support different first frequency bands of the first target frequency band. For example, the first target frequency band is the LB frequency band, and the first radiator 110 can support one of the B5 frequency band, the B8 frequency band, and the B28 frequency band of the LB frequency band. Therefore, the first target frequency band that the first radiator 110 can support can be tuned by the tuning circuit 120, so that the first radiator 110 works in the corresponding first frequency band.

[0099] In addition, in addition to supporting the first target frequency band, the first radiator 110 can also support the second target frequency band. Therefore, the first antenna 100 can support more frequency bands and has a better communication effect. The second target frequency band can be an MB frequency band, such as a B1 frequency band or a B3 frequency band. Further, the position of the connection point P2 is located in the voltage zero point region 110c of the resonant voltage corresponding to the second resonant mode. When the tuning circuit 120 performs aperture tuning on the first target frequency band, the second target frequency band has little effect or even no effect. It can be seen that the first radiator 110 of the first antenna 100 in the antenna assembly 10 provided in the embodiment of the present application can not only support different first frequency bands of the first target frequency band, but also when the tuning circuit 120 tunes the first target frequency band so that the first radiator 110 supports different first frequency bands, the second target frequency band has little effect or even no effect, so that the first antenna 100 also has good communication performance in the second target frequency band.

[0100] In one embodiment, the tuning circuit 120 may include a switch and a plurality of tuning devices. By controlling the tuning device electrically connected to the connection point P2, the first frequency band supported by the first radiator 110 may be adjusted. The switch may be, but is not limited to, a single-pole four-throw switch (SP4T).

[0101] In one embodiment, since the antenna assembly 10 also includes a second antenna 200, the second feed source S2 in the second antenna 200 can excite the second radiator 210 to support a third target frequency band. Therefore, the antenna assembly 10 can support the first target frequency band and the third target frequency band, can support more frequency bands, and has better communication performance.

[0102] In addition, the third target frequency band includes the second target frequency band. Therefore, the second target frequency band supported by the first radiator 110 can expand the bandwidth of the third target frequency band, thereby enabling the antenna assembly 10 to have better communication performance in the third target frequency band.

[0103] In one embodiment, since the third target frequency band includes the second target frequency band and the third target frequency band includes multiple second frequency bands, the second target frequency band can expand the bandwidth of the third target frequency band and realize CA of the third target frequency band, so that the antenna assembly 10 has better communication performance in the third target frequency band.

[0104] In the related art (not the prior art), a plurality of tuning devices and switches are usually provided in the second antenna 200, and different tuning devices are electrically connected to the second radiator 210 through the switch, so that the second radiator 210 supports different second frequency bands in the third target frequency band. Since the switch is provided in the second antenna 200 in the related art, the antenna assembly 10 includes more switches, and the cost is higher. In addition, in the related art, since the switch is provided in the second antenna 200 to adjust the different second frequency bands in the third target frequency band supported by the second radiator 210, the number of second frequency bands supported by the second radiator 210 at the same time is small. Therefore, the antenna assembly 10 in the related art has fewer CA states when supporting the third target frequency band, and the CA state efficiency of some frequency bands is not good. In addition, due to the loss of the switch itself, the efficiency peak of the second radiator 210 in the related art when supporting the third target frequency band is low.

[0105] In the antenna assembly 10 provided in one embodiment of the present application, since the third target frequency band includes the second target frequency band, the second target frequency band supported by the first antenna 100 widens the third target frequency band supported by the second antenna 200, and there is no need to set a tuning device and a switch (for example, SP4T) in the second antenna 200 to expand the bandwidth of the third target frequency band, and there is no need to set a tuning device and a switch (for example, SP4T) in the second antenna 200 to make the second antenna 200 work in a different second frequency band. Therefore, the CA of the third target frequency band in the antenna assembly 10 provided in one embodiment of the present application can have more second frequency bands, and the CA state efficiency is better, and it has a higher peak efficiency.

[0106] In the antenna assembly 10 provided in one embodiment of the present application, when the second antenna 200 is working, the first radiator 110 resonates in the second target frequency band as a parasitic branch of the second radiator 210, thereby widening the bandwidth of the third target frequency band supported by the second antenna 200, so that the second antenna 200 can still enable the antenna assembly 10 to cover the entire third target frequency band without using a switch. It should be noted that since the first radiator 110 supports the first target frequency band in a quarter wavelength mode and the first radiator 110 supports the second target frequency band in a three-quarter wavelength mode, in other words, the triple frequency of the first radiator 110 resonates in the second target frequency band as a parasitic.

[0107] In the related art (not the prior art), the double frequency (i.e., triple frequency) of the first resonance mode of the first radiator 110 will resonate in a higher frequency band. For example, when the first target frequency band supported by the first resonance mode of the first radiator 110 is the LB band, the double frequency (i.e., triple frequency) of the first radiator 110 will resonate in the high frequency (High Band, HB) band (e.g., B40, B41, WiFi 2.4G); when the second antenna 200 resonates in the MB band (e.g., B3, B1), for the HB band supported by the first antenna 100, the radiation mode of the HB band will be due to the second radiator 210 being a parasitic branch of the first radiator 110, and the second radiator 210 being too long as a parasitic branch, causing the HB band to become a balanced mode, and the efficiency is reduced. In this embodiment, the size of the first radiator 110 of the first antenna 100 is lengthened (i.e., the total length of the first radiator 110 satisfies: L 1 >L 0 , where L 0 The length required for the first radiator 110 to support a quarter-wavelength mode of the first target frequency band is such that the triple frequency of the first target frequency band operates in the second target frequency band (in this embodiment, the triple frequency of the LB frequency band operates in the MB frequency band). In addition, since the size of the first radiator 110 is relatively long, the tuning circuit 120 is also used to adjust the electrical length of the first radiator 110 (here, the tuning device of the tuning circuit 120 is used to tune the aperture of the first antenna 100, and the tuning device includes an inductor), so that the first radiator 110 generates the first resonant mode.

[0108] The embodiment of the present application also provides an electronic device 1. The electronic device 1 includes but is not limited to a mobile phone, a telephone, a television, a tablet computer (Pad), a camera, a personal computer, a laptop computer (Personal Computer, PC), a vehicle-mounted device, a headset, a watch, a wearable device, a base station, a vehicle-mounted radar, a customer premise equipment (Customer Premise Equipment, CPE) and other devices that can send and receive electromagnetic wave signals. In this application, the electronic device 1 is taken as an example of a mobile phone, and other devices can refer to the specific description in this application. The electronic device 1 may include an antenna assembly 10 as described in any of the previous embodiments.

[0109] Please refer to Fig.14 and Fig.15 , Fig.14 A three-dimensional schematic diagram of an electronic device provided in one embodiment; Fig.15 for Fig.14The electronic device 1 further comprises a display screen 70, a middle frame 30 and a housing 90 (also referred to as a battery cover). The display screen 70 and the housing 90 are respectively arranged on opposite sides of the middle frame 30. Fig.15 , the middle frame 30 includes a frame body 310 and a frame 320. The frame 320 is arranged around the periphery of the frame body 310. When the antenna assembly 10 includes a first antenna 100, the first radiator 110 of the first antenna 100 is formed on the frame 320. When the antenna assembly 10 includes a second antenna 200 in addition to the first antenna 100, the second radiator 210 of the second antenna 200 is formed on the frame 320. In other words, when the antenna assembly 10 includes a first antenna 100 and a second antenna 200, the first radiator 110 and the second radiator 210 are both formed on the frame 320.

[0110] The middle frame 30 is usually conductive, such as a metal material (such as aluminum or aluminum-magnesium alloy). In the electronic device 1, the middle frame 30 is usually used to support the display screen 70 and the battery cover. Since the middle frame 30 is conductive, the middle frame 30 can also be used as a ground electrode. The devices in the electronic device 1 can be directly or indirectly electrically connected to the middle frame 30 for grounding.

[0111] Specifically, in this embodiment, the frame 320 has an outer surface 320a away from the frame body 310. A first gap 320b is provided between the frame body 310 and a portion of the frame 320, and the frame 320 has a second gap 320c (i.e., the coupling gap 210a) located on the outer surface 320a and connected to the first gap 320b, thereby forming the first radiator 110 and the second radiator 210 as the portion of the frame 320.

[0112] In this embodiment, the frame body 310 can be used as a ground electrode. The first grounding terminal 112 of the first radiator 110 is electrically connected to the frame body 310 for grounding, and the second grounding terminal 212 of the second radiator 210 is electrically connected to the frame body 310 for grounding.

[0113] Compared with a structure in which at least one of the first radiator 110 and the second radiator 210 is independent of the middle frame 30, in this embodiment, part of the frame 320 of the middle frame 30 of the electronic device 1 is reused as the first radiator 110 and the second radiator 210, which can make the electronic device 1 smaller and easier to assemble.

[0114] In addition, in one embodiment, the middle frame 30 and at least one of the housing 90 and the display screen 70 also form a receiving space. The electronic device 1 also includes a battery, functional devices (the functional devices may include one or more of a camera module, a microphone, a receiver, a speaker, a face recognition module, and a fingerprint recognition module) and other devices that can realize the basic functions of the mobile phone, which are arranged in the receiving space, and will not be repeated in this embodiment. It can be understood that the above introduction to the electronic device 1 is only a description of an environment in which the antenna assembly 10 is used, and the specific structure of the electronic device 1 should not be understood as a limitation on the antenna assembly 10 provided in this application. In other embodiments, the electronic device 1 may also not include the display screen 70 and at least one of the housing 90.

[0115] Please continue reading Fig.15 The frame 320 includes a first frame 321 and a second frame 322 that are bent and connected. The length of the first frame 321 is greater than the length of the second frame 322. The first grounding end 112 is located at the first frame 321, and the first free end 111 is located at the second frame 322. The second radiator 210 is located at the second frame 322.

[0116] Generally speaking, the lower the frequency band supported by the radiator, the longer the electrical length of the radiator; correspondingly, the higher the frequency band supported by the radiator, the shorter the length of the radiator. In this embodiment, the length of the first frame 321 is greater than that of the second frame 322, the first frame 321 is a long frame, and the second frame 322 is a short frame. Part of the first radiator 110 is formed on the first frame 321, and the other part of the first radiator 110 is formed on the second frame 322. Specifically, the first grounding end 112 is located at the first frame 321, and the first free end 111 is located at the second frame 322. The first radiator 110 can utilize the first frame 321 as a long frame. Since the first frame 321 is a long frame, there is enough size to prepare part of the first radiator 110. When the size of the first target frequency band supported by the first radiator 110 is low, the first frame 321 also has a relatively sufficient size.

[0117] In one implementation, when the antenna assembly 10 is applied to the electronic device 1, it is usually located at the lower end of the electronic device 1, so the antenna assembly 10 is also called a lower antenna assembly or a lower antenna.

[0118] The above is part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An antenna assembly, characterized in that: The antenna assembly includes a first antenna, the first antenna including: A first radiator, the first radiator having a first free end, a first feeding point, a connection point and a first grounding end, the first grounding end being grounded; A first feed source, the first feed source is electrically connected to the first feeding point, and the first feed source is used to excite the first radiator to generate a first resonance mode and a second resonance mode, wherein the first resonance mode is used to support a first target frequency band, and the second resonance mode is used to support a second target frequency band; and A tuning circuit, wherein the tuning circuit is electrically connected to the connection point, and the tuning circuit is also electrically connected to the ground, and the tuning circuit is used to perform aperture tuning on the first target frequency band so that the first radiator supports different first frequency bands in the first target frequency band, wherein the connection point is located in a voltage zero point region of the resonant voltage corresponding to the second resonant mode, and the voltage zero point region at least includes the voltage zero point of the resonant voltage corresponding to the second resonant mode.

2. The antenna assembly according to claim 1, wherein: The first resonance mode is a quarter-wavelength mode from the first free end to the first ground end of the first radiator; The second resonance mode is a three-quarter wavelength mode from the first free end to the first ground end.

3. The antenna assembly according to claim 2, wherein: The first free end has an end face located on the side of the first feeding point away from the connection point, and a distance d1 from the end face to the connection point satisfies: [(1 / 3)-(1 / 10)]L1≤d1≤[(1 / 3)+(1 / 10)]L1, where L1 is the total length of the first radiator.

4. The antenna assembly according to claim 2, wherein: The total length of the first radiator satisfies: L1>L0, where L0 is the length required for the first radiator to support a quarter-wavelength mode of the first target frequency band; The tuning circuit is further used to adjust the electrical length of the first radiator so that the first radiator generates the first resonance mode.

5. The antenna assembly according to any one of claims 1 to 4, characterized in that: The antenna assembly further includes a second antenna, the second antenna comprising: a second radiator, the second radiator having a second free end, a second feeding point and a second grounding end, the second free end being opposite to the first free end and spaced apart to form a coupling gap, the second radiator being coupled to the first radiator through the coupling gap, and the second grounding end being grounded; and A second feed source, the second feed source is electrically connected to the second feeding point, and the second feed source is used to excite the second radiator to support a third target frequency band, wherein the third target frequency band includes the second target frequency band.

6. The antenna assembly according to claim 5, characterized in that The first antenna also includes: The first feed source electrically connects the band-stop filter circuit to the first feed point, and the band-stop filter circuit resonates in the third target frequency band.

7. The antenna assembly according to claim 5, characterized in that The second feed source is used to excite the second radiator to generate a third resonance mode, a fourth resonance mode and a fifth resonance mode, and the third resonance mode, the fourth resonance mode and the fifth resonance mode are commonly used to support the third target frequency band.

8. The antenna assembly according to claim 7, wherein: The third target frequency band includes a plurality of second frequency bands, and CA of the third target frequency band is implemented.

9. The antenna assembly according to claim 7, wherein: The third target frequency band includes multiple second frequency bands, the reflection coefficient of the resonant frequency point of the second frequency band supported by the third resonance mode is a first reflection coefficient S1, the reflection coefficient of the resonant frequency point of the second frequency band supported by the fourth resonance mode is a second reflection coefficient S2, and the reflection coefficient of the resonant frequency point of the second frequency band supported by the fifth resonance mode is a third reflection coefficient S3, wherein S1<S2, S3<S2, and the second target frequency band at least partially overlaps with the second frequency band supported by the fourth resonance mode.

10. The antenna assembly according to claim 9, wherein: The third resonance mode is a quarter-wavelength mode from the second ground end to the second free end of the second radiator; The fourth resonance mode is a three-quarter wavelength mode from the first free end to the first ground end of the first radiator; The fifth resonance mode is a quarter-wavelength mode from the second feeding point to the second free end.

11. The antenna assembly according to claim 10, wherein: The third resonance mode supports the B3 frequency band, the fourth resonance mode supports the B1 frequency band, and the fifth resonance mode supports the B40 frequency band and the B41 frequency band.

12. The antenna assembly according to claim 5, wherein: The first target frequency band is the LB frequency band, the second target frequency band is the MB frequency band, and the third target frequency band is the MHB frequency band.

13. An electronic device, characterized in that: The electronic device comprises the antenna assembly as described in any one of claims 1-12.

14. The electronic device according to claim 13, characterized in that: The electronic device further includes a middle frame, and the middle frame includes: a frame body; and A frame, the frame is arranged around the periphery of the frame body and connected to the frame body; Wherein, the first radiator in the antenna assembly is formed on the frame; when the antenna assembly further includes a second antenna, the second radiator of the second antenna is formed on the frame.

15. The electronic device according to claim 14, characterized in that: The frame includes a first frame and a second frame connected by bending, the length of the first frame is greater than the length of the second frame, the first grounding end is located in the first frame, and the first free end is located in the second frame; the second radiator is located in the second frame.

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