Antenna assembly and electronic device

Abstract

The application provides an antenna assembly and an electronic device. The antenna assembly comprises a first antenna and a circuit board. The first antenna comprises a first radiator, an adjusting circuit assembly and a first feed source. The first radiator comprises a first end, a second end and a first feed point, and the first feed point is located at the first end. The adjusting circuit assembly comprises a first matching circuit and a switching switch circuit in series. The first feed source electrically connects the adjusting circuit assembly to the first feed point, for exciting the first radiator to support a first target frequency band, and the switching switch circuit is used for adjusting different working frequency bands of the first target frequency band supported by the first radiator. Wherein, a quarter wavelength mode of the first end to the second end of the first radiator is used to support the first target frequency band, and the switching switch circuit, the first matching circuit and the first feed source are all located on the circuit board.

Description

TECHNICAL FIELD

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

[0002] With the development of technology, the popularity of electronic devices with communication functions such as mobile phones is increasing, and the functions are becoming more and more powerful. An antenna assembly is usually included in an electronic device to realize the communication function of the electronic device. However, the antenna assembly in the related art electronic device needs more circuit boards to set the components in the antenna assembly when working, thereby causing the assembly of the antenna assembly to be more complex and the cost to be higher. SUMMARY

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

[0004] a first radiator, the first radiator comprising a first end, a second end, and a first feed point, the first feed point being located at the first end;

[0005] an adjustment circuit assembly, the adjustment circuit assembly comprising a first matching circuit and a switching switch circuit connected in series; and

[0006] a first feed source, the first feed source electrically connecting the adjustment circuit assembly to the first feed point, for exciting the first radiator to support a first target frequency band, the switching switch circuit being used for adjusting different working frequency bands of the first target frequency band supported by the first radiator;

[0007] wherein a quarter wavelength mode of the first end to the second end of the first radiator is used to support the first target frequency band, and the switching switch circuit, the first matching circuit, and the first feed source are all located on the circuit board.

[0008] In a second aspect, the present application provides an electronic device, the electronic device comprising the antenna assembly as in the first aspect.

[0009] In summary, the antenna assembly provided by the embodiments of the present application designs the position of the first feed point, so that the first feed point is located at the first end, and the first feed source excites the quarter wavelength mode of the first end to the second end of the first radiator through the adjustment circuit assembly comprising the first matching circuit and the switching switch circuit, so that the first radiator can support the first target frequency band, and the switching switch circuit, the first matching circuit, and the first feed source are all located on the circuit board. Therefore, when the antenna assembly is assembled with other components of the electronic device to which the antenna assembly is applied, the assembly is simple, and the assembly cost and the total cost are reduced. 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 in the first embodiment of the related technology;

[0012] Figure 2 A schematic diagram of an antenna assembly provided according to one embodiment of this application;

[0013] Figure 3 A schematic diagram of an antenna assembly provided for another embodiment of this application;

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

[0015] Figures 5 to 12 Schematic diagrams of the matching sub-circuits provided for each implementation method;

[0016] Figure 13 Antenna assembly provided for the second embodiment of the related technology;

[0017] Figure 14 A schematic diagram of an antenna assembly provided for yet another embodiment of this application;

[0018] Figure 15 for Figure 14 A schematic diagram showing the dimensions of a portion of the second radiator of the antenna assembly shown;

[0019] Figure 16 A schematic diagram of an antenna assembly provided for another embodiment of this application;

[0020] Figure 17 for Figure 2 The diagram shows a simulation of the S-parameters of the first antenna in the antenna assembly shown.

[0021] Figure 18 for Figure 14 The diagram shows a simulation of the S-parameters of the second antenna in the antenna assembly shown.

[0022] Figure 19 for Figure 16 The diagram shows a simulation of the S-parameters of the second antenna in the antenna assembly shown.

[0023] Figure 20A perspective view of an electronic device according to an embodiment.

[0024] Explanation of main element reference numerals:

[0025] Electronic device 1, antenna assembly 10, first antenna 110, first radiator 111, first end 1111, second end 1112, first feed point P1, adjustment circuit assembly 112, first end point 112c, second end point 112d, first matching circuit M1, matching sub-circuit 113a, switching switch circuit SW0, switch 1121, common end 1123, connection end 1125, lumped element circuit 1126;

[0026] Circuit board 130, first circuit board 140, second circuit board 150, second antenna 120, second radiator 121, first ground end 1211, first free end 1212, second feed point P2, second matching circuit M2, second feed S2, third radiator 122, second ground end 1221, second free end 1222, third free end 1223, connection point P3, coupling gap 122a;

[0027] Inductance L0, first inductance L1, second inductance L2, capacitance C0, first capacitance C1, second capacitance C2, first unit 113b, second unit 113c;

[0028] Middle frame 50, frame 520, shell 90, display screen 70. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the embodiments described in the present application are only part of the embodiments, not all the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] In the present application, "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent or alternative to other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0031] The terms "first", "second", and the like in the description and in the claims of the present application and in the above figures do not denote any order, quantity, or importance, but are used to distinguish different objects. Also, the terms "include" and "have" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a group of components or devices that include one or more components do not limit to the components listed, but optionally further include other components not listed or inherent to such a group or that are added to such a group based on an indicated function.

[0032] In order to embody the beneficial effects of the embodiments of the present application compared with the antenna assembly in the related art (not prior art) before improvement, before introducing the antenna assembly provided by the embodiments of the present application, the antenna assembly in the related art (not prior art) before improvement of each embodiment of the present application is introduced.

[0033] Please refer to Figure 1 , Figure 1A schematic diagram of an antenna assembly is provided for a first embodiment of the related art. In the first embodiment of the related art, the antenna assembly 10 includes a first antenna 110. The first antenna 110 includes a first radiator 111, a first matching circuit M1, a first switch SW1, and a first feed S1. The first radiator 111 includes a first end 1111, a second end 1112, a first connection point P0, and a first feed point P1. The first connection point P0 is located at the first end 1111, the first feed point P1 is located between the first end 1111 and the second end 1112, and the first feed point P1 is spaced apart from the first connection point P0. The first switch SW1 is electrically connected to the first connection point P0. The first feed S1 electrically connects the first matching circuit M1 to the first feed point P1 to excite the first radiator 111 to support a first target frequency band. When the first feed S1 excites the first radiator 111 to support the first target frequency band, a quarter wavelength mode of a portion between the first feed point P1 of the first radiator 111 and the first connection point P0 supports the first target frequency band. The first switch SW1 includes a switch and a plurality of lumped element circuits (also referred to as antenna matching). By controlling the switch 1121 to access different lumped element circuits, the first radiator 111 supports part or all of the first target frequency band. Since the quarter wavelength mode of the portion between the first feed point P1 of the first radiator 111 and the first connection point P0 supports the first target frequency band, the first feed point P1 is far away from the first connection point P0 in order to better support a frequency band with a lower frequency (such as a low frequency band). In the first embodiment of the related art, the first switch SW1 is located on a first circuit board 140 (referred to as A1 board), and the first matching circuit M1 and the first feed S1 are located on a second circuit board 150 (referred to as A2 board). The A1 board and the A2 board are spaced apart by a gap in order to arrange other components (such as a microphone) in the electronic device 1 in the gap. However, in the first embodiment of the related art, the A1 board and the A2 board are independent of each other, and the two circuit boards need to be prepared separately. When the A1 board and the A2 board are assembled with other components in the electronic device 1 to which the antenna assembly 10 is applied to form the electronic device 1, the A1 board and the A2 board need to be assembled separately, which is complex and has a high assembly cost.

[0034] In the embodiment, the first radiator 111 of the antenna assembly 10 is taken as an example of the frame 520 formed on the middle frame 50 of the electronic device to which the antenna assembly 10 is applied. It can be understood that in other embodiments, the first radiator 111 can also be other formed radiators, such as a printed circuit board radiator, a laser direct structuring radiator, etc.

[0035] Next, the antenna assembly 10 provided by the embodiment of the present application is introduced.

[0036] Please refer to Figure 2 , Figure 2 The schematic diagram of the antenna assembly provided by the embodiment of the present application is shown in FIG. 1. The antenna assembly 10 includes a first antenna 110 and a circuit board 130. The first antenna 110 includes a first radiator 111, an adjusting circuit assembly 112, and a first feed source S1. The first radiator 111 includes a first end 1111, a second end 1112, and a first feeding point P1. The first feeding point P1 is located at the first end 1111. The adjusting circuit assembly 112 includes a first matching circuit M1 and a switching switch circuit SW0 connected in series. The first feed source S1 is electrically connected to the adjusting circuit assembly 112 and the first feeding point P1, and is used to excite the first radiator 111 to support a first target frequency band. The switching switch circuit SW0 is used to adjust different working frequency bands of the first target frequency band supported by the first radiator 111. Wherein, the quarter wavelength mode of the first end 1111 to the second end 1112 of the first radiator 111 is used to support the first target frequency band, and the switching switch circuit SW0, the first matching circuit M1, and the first feed source S1 are all located on the circuit board 130.

[0037] In the embodiment, the first radiator 111 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 the electronic device 1 (see FIG. 2), the first radiator 111 is formed on the frame 520 of the middle frame 50 of the electronic device 1. Figure 20When the first target frequency band is a frequency band of 2.4GHz, the first radiator 111 can be a Mechanical Design Antenna (MDA) radiator designed by using the insert metal of the electronic device 1 itself. For example, the first radiator 111 can be an antenna radiator designed by using the middle frame of the electronic device 1 formed by plastic and metal. In addition, the first radiator 111 can also be a metal frame antenna radiator designed by the metal middle frame 50. In the schematic diagram of the embodiment, the first radiator 111 is taken as an example of the metal frame antenna radiator designed by the metal middle frame 50 of the electronic device.

[0038] It can be understood that the shape, structure and material of the first radiator 111 are not limited in the present application. The shape of the first radiator 111 includes but is not limited to bending shape, straight shape, L shape, sheet shape, rod shape, coating, film, etc. When the first radiator 111 is in a strip shape, the extension track of the first radiator 111 is not limited in the present application, so the first radiator 111 can extend in a straight line, a curve, or multiple bending sections. The first radiator 111 described above can be a line with uniform width in the extension track, or can be an irregular shape with different widths, such as gradually changing width or having a widened area.

[0039] The first radiator 111 has two ends, both of which are not grounded, in other words, the first radiator 111 is in an open-circuit state at both ends. Therefore, the two ends are respectively named as the first end 1111 and the second end 1112. In the schematic diagram of the embodiment, the right end of the first radiator 111 is the first end 1111, and the left end of the first radiator 111 is the second end 1112. The first feeding point P1 is located at the first end 1111.

[0040] The quarter wavelength mode from the first end 1111 to the second end 1112 of the first radiator 111 is used to support the first target frequency band. It can be obtained that the entire branch of the first radiator 111 is used to support the first target frequency band.

[0041] The adjustment circuit assembly 112 includes two end points, i.e. the first end point 112c and the second end point 112d. The first end point 112c of the adjustment circuit assembly 112 is electrically connected to the first feed source S1, and the second end point 112d of the adjustment circuit assembly 112 is electrically connected to the first feeding point P1. The second end point 112d of the adjustment circuit assembly 112 can be electrically connected to the first feeding point P1 through an electrical connection member such as a conductive spring, or a conductive screw, or a conductive cable, or conductive glue, etc.

[0042] The adjusting circuit component 112 includes a first matching circuit M1 and a switching switch circuit SW0 in series. In the embodiment, one end of the first matching circuit M1 is the first endpoint 112c of the adjusting circuit, and the other end of the first matching circuit M1 is electrically connected to one end of the switching switch circuit SW0, and the other end of the switching switch circuit SW0 is the second endpoint 112d of the adjusting circuit component 112. In the schematic diagram of the embodiment, the one end of the first matching circuit M1 is taken as the first endpoint 112c of the adjusting circuit component 112, and the other end of the switching switch circuit SW0 is taken as the second endpoint 112d of the adjusting circuit component 112. It can be understood that the schematic diagram shown in the embodiment should not be understood as a limitation of the embodiment of the present application.

[0043] In other embodiments, the other end of the first matching circuit M1 is the second endpoint 112d of the adjusting circuit component 112, and the other end of the first matching circuit M1 is electrically connected to one end of the switching switch circuit SW0, and the other end of the switching switch circuit SW0 is the first endpoint 112c of the adjusting circuit component 112.

[0044] The first feed source S1 is used to generate a first excitation signal, which is fed into the first radiator 111 through the first matching circuit M1 and the switching switch circuit SW0 and the first feed point P1, and excites the quarter-wavelength mode of the first radiator 111 from the first end 1111 to the second end 1112 to support the first target frequency band. In other words, the entire branch of the first radiator 111 supports the first target frequency band in the quarter-wavelength mode.

[0045] The first matching circuit M1 is used to adjust the standing wave of the resonant mode (also referred to as resonant mode or mode) supporting the first target frequency band (i.e., to excite the resonant mode supporting the first target frequency band). In the embodiment, it can be understood that the first matching circuit M1 adjusts the standing wave of the quarter-wavelength mode of the first radiator 111 from the first end 1111 to the second end 1112. The first matching circuit can include one or more of a capacitor, or an inductor, or a parallel connection of a capacitor and an inductor, or a series connection of a capacitor and an inductor, etc.

[0046] The switching switch circuit SW0 is used to adjust different operating frequency bands in the first target frequency band supported by the first radiator 111. When the switching switch circuit SW0 has different matching parameters, the operating frequency band supported by the first radiator 111 is different.

[0047] In the embodiment, the first feeding point P1 is located at the first end 1111, and the first feed source S1 electrically connects the adjusting circuit assembly 112 to the first feeding point P1 to excite the quarter-wavelength mode of the first end 1111 to the second end 1112 of the first radiator 111, so that the first radiator 111 supports the first target frequency band. That is, the antenna assembly 10 provided by the embodiment of the application sets the position of the first feeding point P1 and creatively designs the quarter-wavelength mode of the first end 1111 to the second end 1112 of the first radiator 111 excited by the first feed source S1, so that the first feed source S1 and the first matching circuit M1 can be arranged on the same circuit board 130 as the switching circuit SW0. That is, the switching circuit SW0, the first matching circuit M1, and the first feed source S1 are all located on the circuit board 130.

[0048] In summary, the antenna assembly 10 provided by the embodiment of the application sets the position of the first feeding point P1, so that the first feeding point P1 is located at the first end 1111, and the first feed source S1 excites the quarter-wavelength mode of the first end 1111 to the second end 1112 of the first radiator 111 through the adjusting circuit assembly 112 including the first matching circuit M1 and the switching circuit SW0, so that the first radiator 111 can support the first target frequency band, and the switching circuit SW0, the first matching circuit M1, and the first feed source S1 can all be located on the circuit board 130. Therefore, when the antenna assembly 10 is assembled with other components of the electronic device 1 to which the antenna assembly 10 is applied, the assembly is simple, and the assembly cost and total cost are reduced.

[0049] Please refer to Figure 3 and Figure 4 , Figure 3 is a schematic view of an antenna assembly provided by another embodiment of the application; Figure 4A schematic diagram of an antenna assembly is provided for another embodiment of the present application. The first matching circuit M1 has an input end 112a and an output end 112b. The input end 112a of the first matching circuit M1 is electrically connected to the first feed source S1. The switch circuit SW0 includes a switch 1121 and a plurality of lumped element circuits 1126. The switch 1121 includes a common end 1123 and a plurality of connection ends 1125. The common end 1123 can be electrically connected to one of the plurality of connection ends 1125, and the common end 1123 can be disconnected from the connection ends 1125. The common end 1123 is electrically connected to one of the output end 112b and the first feeding point P1. One end of the lumped element circuit 1126 is electrically connected to the connection end 1125, and different lumped element circuits 1126 are electrically connected to different connection ends 1125. The other end of the lumped element circuit 1126 is electrically connected to the other of the output end 112b and the first feeding point P1. When the common end 1123 is electrically connected to different connection ends 1125, the operating frequency band in the first target frequency band supported by the first radiator 111 is different.

[0050] The input end 112a of the first matching circuit M1 is electrically connected to the first feed source S1 as the first end point 112c of the adjustment circuit assembly 112, or the input end 112a of the first matching circuit M1 is electrically connected to the first feed source S1 through the first end point 112c of the adjustment circuit assembly 112.

[0051] In the present embodiment, the adjustment circuit assembly 112 includes a switch 1121 and a plurality of lumped element circuits 1126 (four are shown in the schematic diagram). In the schematic diagram Figure 3 , the switch 1121 is adjacent to the first matching circuit M1 compared to the plurality of lumped element circuits 1126. In the present embodiment, the common end 1123 is electrically connected to the output end 112b. Accordingly, one end of the lumped element circuit 1126 is connected to the connection end 1125 of the switch 1121, and the other end of the lumped element circuit 1126 is electrically connected to the first feeding point P1.

[0052] In the schematic diagram Figure 4 , the plurality of lumped element circuits 1126 are adjacent to the first matching circuit M1 compared to the switch 1121. In the present embodiment, the common end 1123 is electrically connected to the first feeding point P1. Accordingly, one end of the lumped element circuit 1126 is electrically connected to the connection end 1125, and the other end of the lumped element circuit 1126 is electrically connected to the output end 112b.

[0053] In the embodiment, the matching parameters of each lumped element circuit 1126 are different, and the operating frequency bands in the first target frequency band supported by the first radiator 111 are different when the common terminal 1123 is electrically connected to different connection terminals 1125.

[0054] In the embodiment, the switch circuit SW0 includes the switch 1121 and the plurality of lumped element circuits 1126. When the common terminal 1123 is electrically connected to different connection terminals 1125, the operating frequency bands in the first target frequency band supported by the first radiator 111 are different, so that the different operating frequency bands of the first target frequency band supported by the first antenna 110 can be adjusted by the switch circuit SW0 when the first antenna 110 supports the first target frequency band, so that the first antenna 110 has better communication effect in the first target frequency band.

[0055] Please continue to refer to Figure 3 In the schematic diagram of the embodiment, the common terminal 1123 is electrically connected to the output terminal 112b of the first matching circuit M1. The number of the connection terminals 1125 is four, that is, the plurality of connection terminals 1125 includes a first connection terminal 1125(a), a second connection terminal 1125(b), a third connection terminal 1125(c), and a fourth connection terminal 1125(d). The plurality of lumped element circuits 1126 includes a first lumped element circuit 1126(a), a second lumped element circuit 1126(b), a third lumped element circuit 1126(c), and a fourth lumped element circuit 1126(d). One end of the first lumped element circuit 1126(a) is electrically connected to the first connection terminal 1125(a), and the other end is electrically connected to the first feeding point P1. One end of the second lumped element circuit 1126(b) is electrically connected to the second connection terminal 1125(b), and the other end is electrically connected to the first feeding point P1.

[0056] One end of the third lumped element circuit 1126(c) is electrically connected to the third connection terminal 1125(c), and the other end is electrically connected to the first feeding point P1.

[0057] One end of the fourth lumped element circuit 1126(d) is electrically connected to the fourth connection terminal 1125(d), and the other end is electrically connected to the first feeding point P1.

[0058] In the embodiment, the switch 1121 is a single-pole four-throw (SP4T) switch. The above specific form of the switch circuit SW0 of the antenna assembly 10 provided by the embodiment of the application is simple and easy to implement, and can realize full coverage of each operating frequency band in the first target frequency band when the first antenna 110 operates in the first target frequency band, so that the first antenna 110 has better communication effect in the first target frequency band.

[0059] It can be understood that, in other embodiments, the switch 1121 can also be selected as a single-pole double-throw switch (SPDT) according to the actual number of frequency bands required, and different matching parameters (such as impedance) are switched through the switch 1121 to realize the switching of different working frequency bands. In other embodiments, the switch circuit SW0 can not only be in the form of the existing switch 1121 and the lumped element circuit 1126, but also can use a variable capacitor according to actual needs.

[0060] Please refer to Figures 5 to 12 , Figures 5 to 12 The schematic diagrams of the matching sub-circuit provided in each embodiment are shown in FIGS. 1A to 1H. The first matching circuit M1 includes one or more matching sub-circuits 113a, and the matching sub-circuit 113a includes one or more of the following circuits.

[0061] In Figure 5 , the matching sub-circuit 113a includes a band-pass circuit formed by the inductor L0 and the capacitor C0 in series.

[0062] In Figure 6 , the matching sub-circuit 113a includes a band-stop circuit formed by the inductor L0 and the capacitor C0 in parallel.

[0063] In Figure 7 , the matching sub-circuit 113a includes the inductor L0, the first capacitor C1, and the second capacitor C2, the inductor L0 is connected in parallel with the first capacitor C1, and the second capacitor C2 is electrically connected to the node at which the inductor L0 and the first capacitor C1 are electrically connected.

[0064] In Figure 8 , the matching sub-circuit 113a includes the capacitor C0, the first inductor L1, and the second inductor L2, the capacitor C0 is connected in parallel with the first inductor L1, and the second inductor L2 is electrically connected to the node at which the capacitor C0 and the first inductor L1 are electrically connected.

[0065] In Figure 9 , the matching sub-circuit 113a includes the inductor L0, the first capacitor C1, and the second capacitor C2, the inductor L0 is connected in series with the first capacitor C1, and one end of the second capacitor C2 is electrically connected to the other end of the inductor L0 which is not connected to the first capacitor C1, and the other end of the second capacitor C2 is electrically connected to one end of the first capacitor C1 which is not connected to the inductor L0.

[0066] In Figure 10In a specific embodiment, the matching sub-circuit 113a includes a capacitor C0, a first inductor L1, and a second inductor L2. The capacitor C0 is connected in series with the first inductor L1. One end of the second inductor L2 is electrically connected to the end of the capacitor C0 that is not connected to the first inductor L1. The other end of the second inductor L2 is electrically connected to the end of the first inductor L1 that is not connected to the capacitor C0.

[0067] In a specific embodiment, Figure 11 In a specific embodiment, the matching sub-circuit 113a includes a first capacitor C1, a second capacitor C2, a first inductor L1, and a second inductor L2. The first capacitor C1 is connected in parallel with the first inductor L1. The second capacitor C2 is connected in parallel with the second inductor L2. One end of the combination of the second capacitor C2 and the second inductor L2 is electrically connected to one end of the combination of the first capacitor C1 and the first inductor L1.

[0068] In a specific embodiment, Figure 12 In a specific embodiment, the matching sub-circuit 113a includes a first capacitor C1, a second capacitor C2, a first inductor L1, and a second inductor L2. The first capacitor C1 is connected in series with the first inductor L1 to form a first unit 113b. The second capacitor C2 is connected in series with the second inductor L2 to form a second unit 113c. The first unit 113b and the second unit 113c are connected in parallel.

[0069] In order to embody the beneficial effects of the antenna assembly 10 according to the embodiments of the present application compared with the antenna assembly 10 in the related art (not prior art) before improvement, the antenna assembly 10 in the related art (not prior art) before improvement according to the embodiments of the present application is introduced before the antenna assembly 10 according to the embodiments of the present application is introduced.

[0070] Please refer to Figure 13 , Figure 13The antenna assembly provided by the second embodiment of the related art. In the second embodiment of the related art, the antenna assembly 10 includes a first antenna 110 and a second antenna 120. The first antenna 110 includes a first radiator 111, a first matching circuit M1, a first switch SW1, and a first feed S1. The specific case of the first antenna 110 is described in the antenna assembly 10 provided by the first embodiment of the related art, which is not repeated here. In the antenna assembly 10 provided by the second embodiment of the related art, the second antenna 120 includes a second radiator 121, a third radiator 122, a second feed S2, a second matching circuit M2, and a second switch SW2. The second radiator 121 has a first ground end 1211, a first free end 1212, and a second feed point P2. The second ground end 1221 is grounded, and the second feed point P2 is located at the first free end 1212. The second feed S2 is electrically connected to the second matching circuit M2 to the second feed point P2, and the second switch SW2 is electrically connected to the second feed point P2. The third radiator has a second ground end 1221 and a second free end 1222, and the second free end 1222 is spaced apart from and coupled to the first free end 1212. The second ground end 1221 is disposed adjacent to the first end 1111 of the first radiator 111, and the second ground end 1221 is grounded. In the second embodiment of the related art, the second feed S2 generates a second excitation signal, and the second radiator 121 and the third radiator 122 support a second target frequency band. The second switch SW2 is electrically connected to the second feed point P2, and the second switch SW2 is switched to enable the second radiator 121 and the third radiator 122 to support different operating frequency bands of the second target frequency band.

[0071] However, only a quarter of the entire branch wavelength mode in the second radiator 121 of the second antenna 120 of the antenna assembly 10 provided by the second embodiment of the related art can cover a part of the second target frequency band. Taking the second target frequency band as the MHB frequency band as an example, only a quarter of the entire branch wavelength mode in the second radiator 121 can cover the MB frequency band in the MHB frequency band. The second switch SW2 is needed to switch to implement the switching of different frequency bands of the second target frequency band. For example, when the second target frequency band is the MHB frequency band, the second switch SW2 is needed to switch to implement the switching of the B1 frequency band, the B3 frequency band, the B39 frequency band, the B40 frequency band, and the B41 frequency band.

[0072] As can be seen, the bandwidth of the second antenna 120 of the antenna assembly 10 provided by the second embodiment of the related art is small when supporting the second target frequency band, and the second switch SW2 needs to be set, so that the size of the antenna assembly 10 is large and the cost is high.

[0073] Reference is made to Figure 14 , Figure 14 A schematic diagram of an antenna assembly according to yet another embodiment of the present application is shown. The first feeding point P1 is located at the first end 1111. The antenna assembly 10 further comprises a second antenna 120. The second antenna 120 comprises a second radiator 121, a second matching circuit M2 and a second feed S2. The second radiator 121 has a first ground end 1211, a first free end 1212 and a second feeding point P2. The first ground end 1211 is grounded. The second feeding point P2 is located between the first ground end 1211 and the first free end 1212. The second feed S2 electrically connects the second matching circuit M2 to the second feeding point P2. The second feed S2 is configured to excite the second radiator 121 to support a first resonant mode and a second resonant mode of a second target frequency band. The first resonant mode supports a first frequency band of the second target frequency band. The second resonant mode supports a second frequency band of the second target frequency band. The second feed S2 and the second matching circuit M2 are located on the circuit board 130.

[0074] In the present embodiment, the second radiator 121 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 stub radiator. When the antenna assembly 10 is applied to an electronic device 1, the second radiator 121 can be a Mechanical Design Antenna (MDA) radiator designed by using a metal insert of the electronic device 1. For example, the second radiator 121 can be an antenna radiator designed by using a middle frame formed by a plastic and a metal of the electronic device 1. In addition, the second radiator 121 can also be a metal edge frame antenna radiator designed by using a metal middle frame.

[0075] It can be understood that the shape, structure and material of the second radiator 121 are not limited in the present application. The shape of the second radiator 121 includes but is not limited to a bent shape, a straight shape, an L shape, a sheet shape, a rod shape, a coating, a film, etc. When the second radiator 121 is in a strip shape, the extension track of the second radiator 121 is not limited in the present application. Therefore, the second radiator 121 can extend in a straight line, a curve, a plurality of bent segments, etc. The second radiator 121 described above can be a line with uniform width in the extension track, or can be an irregular shape with different widths, such as a gradually changing width or a widened region.

[0076] In the embodiment, the second radiator 121 can be of the same type as or different from the first radiator 111, and the second radiator 121 can be made of the same material as or different from the first radiator 111.

[0077] The second matching circuit M2 is configured to adjust the standing wave of the first resonant mode and the standing wave of the second resonant mode (i.e., to excite the working mode of the second radiator 121). The second matching circuit can include one or more of a capacitor, or an inductor, or a parallel connection of a capacitor and an inductor, or a series connection of a capacitor and an inductor, etc.

[0078] In the embodiment, the second matching circuit M2 can include one or more matching sub-circuits, which can include one or more of a capacitor, or an inductor, or a parallel connection of a capacitor and an inductor, or a series connection of a capacitor and an inductor, etc. Figures 5 to 12

[0079] In the embodiment, the first matching circuit M1 includes appropriate capacitors and inductors to excite the working mode of the first radiator 111, and accordingly, the second matching circuit M2 includes appropriate capacitors and inductors to excite the working mode of the second radiator 121. Meanwhile, the first matching circuit M1 and the second matching circuit M2 can be provided with bandpass circuits and / or bandstop circuits according to actual needs to play the role of frequency selection filtering and to improve the isolation between the first feeding point P1 and the second feeding point P2. Figure 5 The bandpass circuit shown is equivalent to a capacitor for the LB frequency band and equivalent to an inductor for the MHB frequency band. Figure 6 The bandstop circuit shown is equivalent to an inductor for the LB frequency band and equivalent to a capacitor for the MHB. For the Figures 7 to 10 The matching sub-circuit shown is equivalent to a bandpass circuit for the LB frequency band and equivalent to a bandstop circuit for the MHB. In addition, Figures 5 to 10 The matching sub-circuit shown is only an example and should not be construed as limiting the embodiments of the present application, and the matching sub-circuit can also be extended to combinations of more devices, which are not listed one by one here, and are not described again here.

[0080] ​In this embodiment, the second feed source S2 generates a second excitation signal. The second excitation signal is loaded to the second radiator 121 through the second feeding point P2 to excite the second radiator 121 to support the second target frequency band. Thus, the second feed source S2 can excite the second radiator 121 to support the second target frequency band, and thus the second antenna 120 can support the second target frequency band. Thus, the first antenna 110 of the antenna assembly 10 can support the first target frequency band, and the second antenna 120 of the antenna assembly 10 can support the second target frequency band, and thus the antenna assembly 10 can support more target frequency bands and has better communication effect. In addition, compared with the second feeding point P2 of the antenna assembly 10 provided in the second embodiment of the related art which is located between the first free end 1212 and the first ground end 1211, in the antenna assembly 10 provided in this embodiment, the second feeding point P2 is located between the first ground end 1211 and the first free end 1212, i.e. farther away from the first free end 1212, and thus two resonant modes (i.e. the first resonant mode and the second resonant mode) of the second radiator 121 can be excited to cover the second target frequency band, and thus the antenna assembly 10 has a wider bandwidth in the second target frequency band. In other words, the second feeding point P2 is located between the first ground end 1211 and the first free end 1212, the second feed source S2 excites the second radiator 121 to support the first resonant mode and the second resonant mode of the second target frequency band, the first resonant mode supports the first frequency band of the second target frequency band, and the second resonant mode supports the second frequency band of the second target frequency band, and thus the second antenna 120 can support more frequency bands in the second target frequency band and has a larger bandwidth in the second target frequency band. Further, the antenna assembly 10 provided in this embodiment does not need to set a second switching circuit SW2 as in the related art, i.e. one antenna switch 1121 is saved, and thus the antenna assembly 10 provided in this embodiment has a smaller size and lower cost. Further, the second feed source S2 and the second matching circuit M2 are located on the circuit board 130, and thus when the antenna assembly 10 is assembled with other components to which the antenna assembly 10 is applied, the assembly is simple and the assembly cost and total cost are reduced.

[0081] Further, please refer again to Figure 14The second antenna 120 further includes a third radiator 122. The third radiator includes a second ground end 1221 and a second free end 1222. The second ground end 1221 is grounded, and the second ground end 1221 is spaced apart from the first end 1111. The second free end 1222 is opposite to the second ground end 1221 and faces away from the first end 1111. The second free end 1222 is opposite to and spaced apart from the first free end 1212 to form a coupling gap 122a. The third radiator 122 is configured to support a third resonant mode of the second target frequency band, and the third resonant mode supports a third frequency band of the second target frequency band.

[0082] In the embodiment, the third radiator 122 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 stub radiator. When the antenna assembly 10 is applied to the electronic device 1, the third radiator 122 can be a Mechanical Design Antenna (MDA) radiator designed by using a metal insert of the electronic device 1. For example, the third radiator 122 can be an antenna radiator designed by using a middle frame formed by plastic and metal of the electronic device 1. In addition, the third radiator 122 can also be a metal frame antenna radiator designed by using a metal middle frame.

[0083] It can be understood that the shape, structure and material of the third radiator 122 are not limited in the present application. The shape of the third radiator 122 includes but is not limited to a bent shape, a straight shape, an L shape, a sheet shape, a rod shape, a coating, a film, etc. When the third radiator 122 is in a strip shape, the extension track of the third radiator 122 is not limited in the present application. Therefore, the third radiator 122 can extend in a straight line, a curve, or a plurality of bent segments. The third radiator 122 can be a line with uniform width, or can be an irregular shape with different widths, such as a gradually changing width or a widened region.

[0084] In the embodiment, the type of the third radiator 122 can be the same as or different from the first radiator 111, and the material of the third radiator 122 can be the same as or different from the material of the first radiator 111. Correspondingly, the type of the third radiator 122 can be the same as or different from the second radiator 121, and the material of the third radiator 122 can be the same as or different from the material of the second radiator 121.

[0085] In the embodiment, the second feed source S2 generates a second excitation signal. The second excitation signal is loaded to the second radiator 121 through the second feeding point P2 to excite the second radiator 121 to support the second target frequency band. In the embodiment, the second radiator 121 serves as a main radiator (also referred to as a main branch) of the second antenna 120, and the third radiator 122 serves as a parasitic radiator (also referred to as a parasitic branch) of the second antenna 120. The second free end 1222 and the first free end 1212 form a coupling gap 122a, and the third radiator 122 couples the second excitation signal of the second radiator 121 through the coupling gap 122a and supports a third resonant mode of the second target frequency band under the excitation of the second excitation signal. It can be seen that the second antenna 120 in the antenna assembly 10 provided by the embodiment supports a third frequency band of the second target frequency band through the third resonant mode of the third radiator 122, so that the second antenna 120 supports more frequency bands in the second target frequency band and has a larger bandwidth in the second target frequency band.

[0086] Further, the first resonant mode is a quarter-wavelength mode from the second feeding point P2 to the first ground end 1211. The second resonant mode is a quarter-wavelength mode from the second feeding point P2 to the coupling gap 122a. The third resonant mode is a quarter-wavelength mode from the second free end 1222 of the third radiator 122 to the second ground end 1221.

[0087] It should be noted that the "wavelength" in the quarter-wavelength mode from the second feeding point P2 to the first ground end 1211 in the first resonant mode refers to a wavelength corresponding to a center frequency point of a first frequency band corresponding to the first resonant mode. The quarter-wavelength mode is also referred to as a base mode. When the second radiator 121 supports the first frequency band and the first resonant mode is the quarter-wavelength mode from the second feeding point P2 to the first ground end 1211, that is, the second radiator 121 supports the first frequency band and operates in the base mode from the second feeding point P2 to the first ground end 1211. When the second radiator 121 supports the first frequency band and operates in the base mode from the second feeding point P2 to the first ground end 1211, the second antenna 120 has better radiation efficiency in the first frequency band.

[0088] Correspondingly, the "wavelength" of the second resonant mode is a quarter wavelength mode from the second feeding point P2 to the coupling slot 122a, which means the wavelength corresponding to the center frequency point of the second frequency band corresponding to the second resonant mode. The quarter wavelength mode is also called the fundamental mode. When the second resonant mode is a quarter wavelength mode from the second feeding point P2 to the coupling slot 122a, that is, the second radiator 121 supports the second frequency band and works in the fundamental mode from the second feeding point P2 to the coupling slot 122a. When the second radiator 121 supports the second frequency band and works in the fundamental mode from the second feeding point P2 to the coupling slot 122a, the second antenna 120 has better radiation efficiency in the second frequency band.

[0089] The "wavelength" of the third resonant mode is a quarter wavelength mode from the second free end 1222 of the third radiator 122 to the second ground end 1221, which means the wavelength corresponding to the center frequency point of the third frequency band corresponding to the third resonant mode. The quarter wavelength mode is also called the fundamental mode. When the third resonant mode is a quarter wavelength mode from the second free end 1222 of the third radiator 122 to the second ground end 1221, that is, the third radiator 122 supports the third frequency band and works in the fundamental mode from the second free end 1222 to the second ground end 1221. When the third radiator 122 supports the third frequency band and works in the fundamental mode from the second free end 1222 to the second ground end 1221, the second antenna 120 has better radiation efficiency in the third frequency band. It should be noted that the third resonant mode is a quarter wavelength mode from the second free end 1222 of the third radiator 122 to the second ground end 1221, that is, the quarter wavelength mode from the second free end 1222 of the third radiator 122 to the second ground end 1221 is the third resonant mode. As can be seen, the entire branch of the third radiator 122 supports the third resonant mode.

[0090] Further, please refer to Figure 15 , Figure 15 is Figure 14 a size diagram of a part of the second radiator of the antenna assembly shown in FIG. 1. The distance d1 between the second feeding point P2 and the first ground end 1211 satisfies: d1 = λ1 / 4, where λ1 is the wavelength corresponding to the center frequency point of the first frequency band. The distance d2 between the second feeding point P2 and the coupling slot 122a satisfies: d2 = λ2 / 4, where λ2 is the wavelength corresponding to the center frequency point of the second frequency band.

[0091] The distance d1 between the second feeding point P2 and the first ground end 1211 satisfies d1 = λ1 / 4, so that the quarter wavelength mode from the second feeding point P2 to the first ground end 1211 can better support the first frequency band. The distance d2 between the second feeding point P2 and the coupling slot 122a satisfies d2 = λ2 / 4, so that the quarter wavelength mode from the second feeding point P2 to the coupling slot 122a can better support the second frequency band.

[0092] The center frequency of the first frequency band is marked as a first frequency (or first frequency point) f1, and the center frequency of the second frequency band is marked as a second frequency (or second frequency point) f2.

[0093] The relationship between the wavelength λ and the frequency f of the electromagnetic wave signal can be expressed as where c is the speed of light, and ε is the relative permittivity of the electromagnetic wave signal in the medium. Therefore, the wavelength corresponding to the first frequency is the first wavelength λ1, which satisfies The wavelength corresponding to the second frequency f2 is the second wavelength λ2, which satisfies where c is the speed of light, and ε is the relative permittivity of the electromagnetic wave signal in the medium. Ideally, ε = 1. When the first frequency and the second frequency are determined, the first wavelength and the second wavelength can be calculated, and the position of the second feeding point P2 can be determined according to the distance between the second feeding point P2 and the first ground end 1211 and the distance from the second feeding point P2 to the coupling slot 122a described above.

[0094] Further, the first target frequency band is a low frequency (Low Band, LB) band, and the second target frequency band is a middle high frequency (Middle High Band, MHB) band. The antenna assembly 10 can implement carrier aggregation (Carrier Aggregation, CA) of the LB band + MHB band; or the antenna assembly 10 can implement dual connectivity (LTE NR Double Connect, ENDC) of the LB band + MHB band of the 4G wireless access network and the 5G-NR.

[0095] In this embodiment, the antenna assembly 10 can implement CA of the LB band + MHB band, or ENDC of the LB band + MHB band, so that the antenna assembly 10 has better communication performance and meets the communication requirements of the electronic device 1 to which the antenna assembly 10 is applied.

[0096] Please refer to Figure 16 , Figure 16Fig. 1 shows a schematic diagram of an antenna assembly according to another embodiment of the present application. The antenna assembly 10 comprises a first antenna 110 and a circuit board 130. The first antenna 110 comprises a first radiator 111, an adjusting circuit assembly 112, and a first feed S1. The first radiator 111 comprises a first end 1111, a second end 1112, and a first feed point P1. The first feed point P1 is located at the first end 1111. The adjusting circuit assembly 112 comprises a first matching circuit M1 and a switching switch circuit SW0 in series. The first feed S1 electrically connects the adjusting circuit assembly 112 to the first feed point P1 for exciting the first radiator 111 to support a first target frequency band. The switching switch circuit SW0 is used to adjust different operating frequency bands of the first target frequency band supported by the first radiator 111. The quarter wavelength mode of the first end 1111 to the second end 1112 of the first radiator 111 is used to support the first target frequency band. The switching switch circuit SW0, the first matching circuit M1, and the first feed S1 are all located on the circuit board 130. The related conditions of the first antenna 110 are described above and will not be repeated here.

[0097] In addition, the antenna assembly 10 further comprises a second antenna 120. The second antenna 120 comprises a second radiator 121, a second matching circuit M2, a second feed S2, and a third radiator 122. The second radiator 121 has a first ground end 1211, a first free end 1212, and a second feed point P2. The first ground end 1211 is grounded. The second feed point P2 is located between the first ground end 1211 and the first free end 1212. The second feed S2 electrically connects the second matching circuit M2 to the second feed point P2. The second feed S2 is used to excite the second radiator 121 to support a first resonant mode and a second resonant mode of a second target frequency band. The first resonant mode supports a first frequency band of the second target frequency band, and the second resonant mode supports a second frequency band of the second target frequency band. The second feed S2 and the second matching circuit M2 are located on the circuit board 130. The third radiator 122 comprises a second free end 1222, a third free end 1223, and a connection point P3. The second free end 1222 is arranged in a spaced-apart manner with the first free end 1212 and forms a coupling gap 122a. The third free end 1223 is arranged in a spaced-apart manner with the first free end 1212. The connection point P3 is located at the third free end 1223. The switching switch circuit SW0 is further electrically connected to the connection point P3 to excite the third radiator 122 to support a third target frequency band.

[0098] In the embodiment, the second excitation signal is generated by the second feed source S2. The second excitation signal is loaded to the second radiator 121 through the second feeding point P2 to excite the second radiator 121 to support the second target frequency band. Thus, the second excitation signal can excite the second radiator 121 to support the second target frequency band, and thus the second antenna 120 can support the second target frequency band. Thus, the first antenna 110 of the antenna assembly 10 can support the first target frequency band, and the second antenna 120 of the antenna assembly 10 can support the second target frequency band, and thus the antenna assembly 10 can support more target frequency bands and has better communication effect. In addition, the second feeding point P2 is located between the first grounding end 1211 and the first free end 1212, the second excitation signal excites the second radiator 121 to support the first resonant mode and the second resonant mode of the second target frequency band, the first resonant mode supports the first frequency band of the second target frequency band, and the second resonant mode supports the second frequency band of the second target frequency band, and thus the second antenna 120 can support more frequency bands in the second target frequency band and has a larger bandwidth in the second target frequency band. Further, the antenna assembly 10 provided in the embodiment of the present application does not need to set the second switching circuit SW2 as in the related art, and thus the antenna assembly 10 provided in the embodiment of the present application has a smaller size and lower cost. Further, the second feed source S2 and the second matching circuit M2 are located on the circuit board 130, and thus when the antenna assembly 10 is assembled with other components to which the antenna assembly 10 is applied, the assembly is simple and the assembly cost and total cost are reduced.

[0099] In the embodiment, the input end 112a of the switching circuit SW0 is electrically connected to the first matching circuit M1, one output end 112b of the switching circuit SW0 is electrically connected to the first feeding point P1, and the other output end 112b of the switching circuit SW0 is electrically connected to the connection point P3. Thus, the switching circuit SW0 can be regarded as being hung on the first radiator 111 and the third radiator 122 at the same time. On the one hand, the switching circuit SW0 is used to adjust different working frequency bands of the first target frequency band supported by the first radiator 111; on the other hand, the switching circuit SW0 is also used to adjust the frequency position of the third radiator 122 to excite the third radiator 122 to support the third target frequency band.

[0100] In an embodiment, the first target frequency band is a lower band (LB) frequency band, the second target frequency band is a middle high band (MHB) frequency band, and the third target frequency band is an ultra high band (UHB) frequency band.

[0101] In this embodiment, the second target frequency band is the MHB band. The third radiator 122 is generated in a third resonant mode by the switching circuit SW0, so that the third radiator 122 supports the UHB band. Therefore, the antenna assembly 10 can support both the MHB band and the UHB band.

[0102] In one embodiment, the first and second resonant modes jointly support the B1, B3, B39, B40, and B41 bands of the MHB frequency band. The third resonant mode supports the N78 band of the UHB frequency band.

[0103] The antenna assembly 10 provided in various embodiments of this application will be described below with reference to various simulation diagrams.

[0104] Please see Figure 17 , Figure 17 for Figure 2 The diagram shows a simulation of the S-parameters of the first antenna in the antenna assembly. In this simulation diagram, the horizontal axis represents frequency in GHz, and the vertical axis represents S-parameters in dB. Curves ①, ②, and ③ represent the S-parameter curves when the switching circuit SW0 has different matching parameters. As can be seen from any of curves ①, ②, and ③, the first antenna 110 of the antenna assembly 10 operates in the low-frequency band (i.e., in this embodiment, the first target frequency band is the low-frequency band). As can be seen from curves ①, ②, and ③, when the switching circuit SW0 has different matching parameters, the first radiator 111 of the first antenna 110 operates in different operating frequency bands within the first target frequency band (here, the low-frequency band). By adjusting the different matching parameters of the switching circuit SW0, the first radiator 111 of the first antenna 110 can switch between different operating frequency bands (here, band B28, band B5, and band B8) within the first target frequency band. That is, the switching circuit SW0 is used to adjust the different operating frequency bands of the first target frequency band supported by the first radiator 111. In this simulation diagram, curve ① represents the B5 frequency band, curve ② represents the B8 frequency band, and curve ③ represents the B28 frequency band as examples.

[0105] Please see Figure 18 , Figure 18 for Figure 14A simulation diagram of S parameters of the second antenna of the antenna assembly is shown. In the simulation diagram, the horizontal coordinate is frequency, in GHz, and the vertical coordinate is S parameters, in dB. As shown in the simulation diagram, the S parameter curve has three recesses, which correspond to a first resonance mode (labeled as mode 1 in the figure), a second resonance mode (labeled as mode 2 in the figure), and a third resonance mode (labeled as mode 3 in the figure), respectively. As shown in the simulation diagram, the first resonance mode, the second resonance mode, and the third resonance mode can support the MHB frequency band.

[0106] As can be seen from the above description and simulation of the antenna assembly 10, the first radiator 111, the second radiator 121, and the third radiator 122 can cover the entire LB frequency band + MHB frequency band, and the LB frequency band and the MHB frequency band do not affect each other, so that CA of the LB frequency band + MHB frequency band and ENDC of the LB frequency band + MHB frequency band can be implemented.

[0107] Please refer to Figure 19 , Figure 19 for Figure 16 A simulation diagram of S parameters of the second antenna of the antenna assembly is shown. In the simulation diagram, the horizontal coordinate is frequency, in GHz, and the vertical coordinate is S parameters, in dB. As shown in the simulation diagram, the S parameter curve has three recesses, which correspond to a first resonance mode (labeled as mode 1 in the figure), a second resonance mode (labeled as mode 2 in the figure), and a third resonance mode (labeled as mode 3 in the figure), respectively. As shown in the simulation diagram, the third resonance mode generated by the third radiator 122 is located in the UHB frequency band. Specifically, as shown in the simulation diagram, the first resonance mode and the second resonance mode jointly support the B1 frequency band, the B3 frequency band, the B39 frequency band, the B40 frequency band, and the B41 frequency band of the MHB frequency band. The third resonance mode supports the N78 frequency band of the UHB frequency band.

[0108] The electronic device 1 provided in the embodiments of the present application can be, but is not limited to, a mobile phone, a telephone, a television, a tablet computer (Pad), a camera, a personal computer (PC), a notebook computer, a vehicle-mounted device, a headset, a watch, a wearable device, a base station, a vehicle-mounted radar, a customer premise equipment (CPE), and the like, which can transmit and receive electromagnetic wave signals. In the present application, the electronic device 1 is taken as an example of a mobile phone, and other devices can refer to the specific description in the present application.

[0109] The electronic device 1 comprises the antenna assembly 10 provided in any of the foregoing embodiments. The antenna assembly 10 is described above and will not be repeated here. Please refer to Figure 20 , Figure 20 A perspective view of an electronic device provided in an embodiment. The electronic device 1 further comprises a display screen 70, a middle frame 50 and a shell 90 (also referred to as a battery cover). The display screen 70 and the shell 90 are respectively arranged on two sides of the middle frame 50 opposite to each other. In an embodiment, the first radiator 111 is formed on the frame 520 of the middle frame 50.

[0110] When the antenna assembly 10 comprises a second antenna 120 in addition to the first antenna 110, the second antenna 120 comprises a second radiator 121, the first radiator 111 and the second radiator 121 are formed on the frame 520 of the middle frame 50.

[0111] When the antenna assembly 10 comprises a second antenna 120 in addition to the first antenna 110, the second antenna 120 comprises a second radiator 121 and a third radiator 122, the first radiator 111, the second radiator 121 and the third radiator 122 are formed on the frame 520 of the middle frame 50.

[0112] In an embodiment, the middle frame 50 and at least one of the shell 90 and the display screen 70 further form a receiving space. The electronic device 1 further comprises a battery, functional devices (the functional devices can comprise one or more of a camera module, a microphone, a receiver, a speaker, a face recognition module, a fingerprint recognition module) and other devices capable of realizing the basic functions of a mobile phone arranged in the receiving space, which will not be repeated in the present embodiment. It can be understood that the above description of the electronic device 1 is only a description of an environment in which the antenna assembly 10 is applied, and the specific structure of the electronic device 1 should not be understood as a limitation of the antenna assembly 10 provided in the present application.

[0113] The above is part of the embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered within the scope of protection of the present application.

Claims

1. An antenna assembly, characterized by The antenna assembly is applied to an electronic device, and the antenna assembly comprises a first antenna and a circuit board, wherein the first antenna comprises: a first radiator comprising a first end, a second end and a first feeding point, the first feeding point is located at the first end, the first radiator is located at a bottom end of the electronic device, and the first radiator is formed on a frame of the electronic device; an adjusting circuit assembly comprising a first matching circuit and a switching switch circuit connected in series; and a first feed source electrically connecting the adjusting circuit assembly to the first feeding point for exciting the first radiator to support a first target frequency band, and the switching switch circuit is used for adjusting different working frequency bands of the first target frequency band supported by the first radiator; wherein a quarter wavelength mode of the first end to the second end of the first radiator is used to support the first target frequency band, and the switching switch circuit, the first matching circuit and the first feed source are all located on the circuit board.

2. The antenna assembly of claim 1, wherein, The first matching circuit has an input end and an output end, and the input end of the first matching circuit is electrically connected to the first feed source; the switching switch circuit comprises: a switch comprising a common end and a plurality of connection ends, the common end can be electrically connected to one of the plurality of connection ends, and the common end can be disconnected from the electrical connection of the connection end, the common end is electrically connected to one of the output end and the first feeding point; and a plurality of lumped element circuits, one end of the lumped element circuit is electrically connected to the connection end, and different lumped element circuits are electrically connected to different connection ends, the other end of the lumped element circuit is electrically connected to the other of the output end and the first feeding point; When the common end is electrically connected to different connection ends, the working frequency band in the first target frequency band supported by the first radiator is different.

3. The antenna assembly of claim 2, wherein, The common end is electrically connected to the output end of the first matching circuit; the plurality of connection ends comprises a first connection end, a second connection end, a third connection end and a fourth connection end, and the plurality of lumped element circuits comprises: a first lumped element circuit, one end of the first lumped element is electrically connected to the first connection end, and the other end is electrically connected to the first feeding point; a second lumped element circuit, one end of the second lumped element circuit is electrically connected to the second connection end, and the other end is electrically connected to the first feeding point; a third lumped element circuit, one end of the third lumped element circuit is electrically connected to the third connection end, and the other end is electrically connected to the first feeding point; and a fourth lumped element circuit, one end of the fourth lumped element circuit is electrically connected to the fourth connection end, and the other end is electrically connected to the first feeding point.

4. The antenna assembly of claim 1, wherein, The first matching circuit comprises one or more matching sub-circuits, and the matching sub-circuit comprises one or more of the following: a band-pass circuit formed by inductance and capacitance in series; a band-stop circuit formed by inductance and capacitance in parallel; inductance, a first capacitance and a second capacitance, the inductance and the first capacitance are connected in parallel, and the second capacitance is connected to a node where the inductance and the first capacitance are connected; a capacitor, a first inductor, and a second inductor, the capacitor being in parallel with the first inductor, and the second inductor being electrically connected to a node at which the capacitor and the first inductor are electrically connected; an inductor, a first capacitor, and a second capacitor, the inductor being in series with the first capacitor, and one end of the second capacitor being electrically connected to a first end of the first capacitor at which the inductor is not connected, and another end of the second capacitor being electrically connected to one end of the first capacitor at which the inductor is not connected; a capacitor, a first inductor, and a second inductor, the capacitor being in series with the first inductor, one end of the second inductor being electrically connected to one end of the capacitor at which the first inductor is not connected, and another end of the second inductor being electrically connected to one end of the first inductor at which the capacitor is not connected; a first capacitor, a second capacitor, a first inductor, and a second inductor, the first capacitor being in parallel with the first inductor, the second capacitor being in parallel with the second inductor, and one end of the entirety formed by the second capacitor and the second inductor being electrically connected to one end of the entirety formed by the first capacitor and the first inductor; a first capacitor, a second capacitor, a first inductor, and a second inductor, the first capacitor and the first inductor being in series to form a first unit, the second capacitor and the second inductor being in series to form a second unit, and the first unit and the second unit being in parallel.

5. The antenna assembly of any of claims 1-4, wherein, The first feed point is located at the first end, and the antenna assembly further comprises a second antenna, the second antenna comprising: a second radiator having a first ground end, a first free end, and a second feed point, the first ground end being grounded, and the second feed point being located between the first ground end and the first free end; a second matching circuit; and a second feed source electrically connecting the second matching circuit to the second feed point, the second feed source being configured to excite the second radiator to support a first resonant mode and a second resonant mode of a second target frequency band, the first resonant mode supporting a first frequency band of the second target frequency band, the second resonant mode supporting a second frequency band of the second target frequency band, and the second feed source and the second matching circuit being located on the circuit board.

6. The antenna assembly of claim 5, wherein, The second antenna further comprises: a third radiator comprising a second ground end and a second free end, the second ground end being grounded, the second ground end being spaced apart from the first end, the second free end being opposite to the second ground end and facing away from the first end, and the second free end being opposite to and spaced apart from the first free end to form a coupling gap; the third radiator being configured to support a third resonant mode of the second target frequency band, and the third resonant mode supporting a third frequency band of the second target frequency band.

7. The antenna assembly of claim 6, wherein: the first resonant mode is a quarter-wavelength mode from the second feed point to the first ground end; the second resonant mode is a quarter-wavelength mode from the second feed point to the coupling gap; the third resonant mode is a quarter-wavelength mode from the second free end of the third radiator to the second ground end.

8. The antenna assembly of claim 7, wherein, A distance d1 between the second feeding point and the first ground terminal satisfies d1 = λ1 / 4, where λ1 is a wavelength corresponding to a center frequency point of the first frequency band; A distance d2 between the second feeding point and the coupling slot satisfies d2 = λ2 / 4, where λ2 is a wavelength corresponding to a center frequency point of the second frequency band.

9. The antenna assembly of claim 6, wherein, The first target frequency band is an LB frequency band, and the second target frequency band is an MHB frequency band. The antenna assembly can implement CA of the LB frequency band + the MHB frequency band; or The antenna assembly can implement ENDC of the LB frequency band + the MHB frequency band.

10. The antenna assembly of any of claims 1-4, wherein, The antenna assembly further includes a second antenna, which includes: A second radiator having a first ground terminal, a first free end, and a second feeding point, the first ground terminal being grounded, and the second feeding point being located between the first ground terminal and the first free end; A second matching circuit; A second feed source electrically connecting the second matching circuit to the second feeding point, the second feed source being configured to excite the second radiator to support a first resonant mode and a second resonant mode of a second target frequency band, the first resonant mode supporting a first frequency band of the second target frequency band, and the second resonant mode supporting a second frequency band of the second target frequency band, and the second feed source and the second matching circuit being located on the circuit board; and A third radiator including a second free end, a third free end, and a connection point, the second free end being spaced apart from the first free end and forming a coupling slot, and the third free end being spaced apart from the first free end, and the connection point being located at the third free end. The switch circuit is further electrically connected to the connection point to excite the third radiator to support a third target frequency band.

11. The antenna assembly of claim 10, wherein, The first target frequency band is an LB frequency band, the second target frequency band is an MHB frequency band, and the third target frequency band is a UHB frequency band.

12. An electronic device, comprising: The electronic device includes the antenna assembly as claimed in any one of claims 1-11. The electronic device includes the antenna assembly as claimed in any one of claims 1-11.

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