Antenna assembly and electronic equipment

Abstract

The invention provides an electronic device. The electronic equipment comprises an antenna assembly. The antenna assembly comprises a floor, a radiator and a first feed source. The middle frame comprises a first edge and a second edge which are connected in a bent mode, and the length of the first edge is larger than that of the second edge; the radiator comprises a first radiation part and a second radiation part which are connected in a bending manner, and is provided with a feeding point, the first radiation part is provided with a first open circuit end and is arranged corresponding to the first edge, and the second radiation part is provided with a second open circuit end and is arranged corresponding to the second edge; the first feed source is electrically connected to the feed point, the first feed source is used for generating a first excitation signal to excite the radiator to generate a first resonant mode supporting a first target frequency band, and the first resonant mode is a half wavelength mode from the first open circuit end to the second open circuit end.

Description

Technical Field

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

[0002] With the development of technologies, the popularity of electronic devices with communication functions such as mobile phones is getting higher and higher, and the functions are getting more and more powerful. An antenna assembly is usually included in an electronic device to implement the communication function of the electronic device. However, the Specific Absorption Rate (SAR) value of the antenna assembly in the related art electronic device is relatively large, which causes greater harm to the human body. Summary of the Invention

[0003] In a first aspect, this application provides an electronic device, the electronic device includes an antenna assembly, and the antenna assembly includes:

[0004] A middle frame, the middle frame includes a first side and a second side that are bent and connected, wherein the length of the first side is greater than the length of the second side;

[0005] A radiator, the radiator includes a first radiation part and a second radiation part that are bent and connected, and has a feeding point. The first radiation part has a first open end, and the first radiation part is disposed corresponding to the first side. The second radiation part has a second open end, and the second radiation part is disposed corresponding to the second side; and

[0006] A first feeder, the first feeder is electrically connected to the feeding point, and the first feeder is configured to generate a first excitation signal to excite the radiator to generate a first resonance mode supporting a first target frequency band, wherein the first resonance mode is a half-wavelength mode from the first open end to the second open end.

[0007] In summary, for the antenna assembly in the electronic device provided by the embodiments of this application, the radiator of the antenna assembly includes a first radiation part and a second radiation part that are bent and connected. Therefore, when the radiator supports the first target frequency band and operates in the half-wavelength mode from the first open end to the second open end, the SRA hot spots of the antenna assembly are no longer concentrated at one place, but are dispersed in the first radiation part and the second radiation part. Since the SAR hot spots are dispersed, the SAR value of the first SAR hot spot of the first radiation part is relatively low, and the SAR value of the second SAR hot spot of the second radiation part is relatively low. It can be seen that the SAR value of the antenna assembly provided by the embodiments of this application is relatively low when supporting the first target frequency band. When communicating using the first target frequency band, the harm to the human body is relatively small or even harmless. Description of the Drawings

[0008] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0009] Figure 1 Schematic diagram of an antenna assembly in the related art;

[0010] Figure 2 For Figure 1 Schematic diagram of the current distribution when the radiator of the antenna assembly in the related art shown supports the balanced mode;

[0011] Figure 3 For Figure 1 Schematic diagram of the SAR hot spot distribution in the antenna assembly of the related art shown;

[0012] Figure 4 Schematic diagram of an antenna assembly provided by an embodiment of the present application;

[0013] Figure 5 For Figure 4 Schematic diagram of the current corresponding to the first resonance mode supported by the radiator in the antenna assembly shown in

[0014] Figure 6 For Figure 4 Schematic diagram of the SAR hot spot distribution when the antenna assembly shown supports the first target frequency band;

[0015] Figure 7 For Figure 4 Schematic diagram of the size identification of the relevant parts of the radiator in the antenna assembly shown in

[0016] Figure 8 For Figure 4 Schematic diagram of the current distribution when the antenna assembly shown supports the first frequency band;

[0017] Figure 9 For Figure 4 Schematic diagram of the current distribution when the antenna assembly shown supports the second frequency band;

[0018] Figure 10 Schematic diagram of an antenna assembly provided by another embodiment of the present application;

[0019] Figure 11 For Figure 10 Schematic diagram of the size identification of the relevant parts of the radiator in the antenna assembly shown in

[0020] Figure 12 Schematic diagram of an antenna assembly provided by another embodiment of the present application;

[0021] Figure 13 Schematic diagram of the antenna assembly provided for another embodiment of the present application;

[0022] Figure 14 For Figure 12 Schematic diagram of the size identification of some components of the antenna assembly shown in;

[0023] Figure 15 Schematic diagram of the antenna assembly provided for another embodiment of the present application;

[0024] Figure 16 Schematic diagram of the antenna assembly provided for another embodiment of the present application;

[0025] Figure 17 Schematic diagram of the antenna assembly provided for yet another embodiment of the present application;

[0026] Figure 18 Schematic diagram of the antenna assembly provided for yet another embodiment of the present application;

[0027] Figure 19 Schematic diagram of the antenna assembly provided for another embodiment of the present application;

[0028] Figure 20 For Figure 19 Schematic diagram of some structures of the antenna assembly shown in;

[0029] Figure 21 Schematic diagram of the antenna assembly provided for another embodiment of the present application;

[0030] Figure 22 For Figure 21 Schematic diagram of some structures of the antenna assembly shown in;

[0031] Figure 23 Schematic diagram of the distribution of the characteristic current with the largest proportion of the longitudinal current corresponding to the characteristic mode of the middle frame;

[0032] Figure 24 For Figure 23 Schematic diagram of the current weak point area and current strong point area in the middle frame shown in;

[0033] Figure 25 Schematic diagram of the antenna assembly of one embodiment;

[0034] Figure 26 Schematic diagram of the antenna assembly including inductive devices;

[0035] Figure 27 Schematic diagram of the antenna assembly provided for one embodiment of the present application;

[0036] Figure 28Schematic diagram of the current weak area in the antenna assembly provided for another embodiment;

[0037] Figure 29 For Figure 4 Schematic diagram of the S11 curve of the antenna assembly shown;

[0038] Figure 30 For Figure 4 Efficiency simulation diagram of the antenna assembly shown;

[0039] Figure 31 For Figure 13 Schematic diagram of the S11 curve of the antenna assembly shown;

[0040] Figure 32 For Figure 13 Efficiency simulation diagram of the antenna assembly shown;

[0041] Figure 33 For Figure 1 Efficiency simulation diagram of the antenna assembly in the related art of;

[0042] Figure 34 For Figure 17 Simulation diagram of the antenna assembly shown in;

[0043] Figure 35 For Figure 17 Efficiency simulation diagrams of the first target frequency band and the second target frequency band when the antenna assembly in operates in the first target frequency band;

[0044] Figure 36 For Figure 17 Efficiency simulation diagrams of different sub - frequency bands when the antenna assembly in operates in the third target frequency band;

[0045] Figure 37 Schematic diagram of the SAR value of the antenna assembly provided by the related art;

[0046] Figure 38 Schematic diagram of the SAR value of the antenna assembly provided by one embodiment of the present application;

[0047] Figure 39 Schematic diagram of the electronic device provided by one embodiment of the present application;

[0048] Figure 40 For Figure 39 Partial structural schematic diagram of the electronic device shown in;

[0049] Description of main element numbers:

[0050] Electronic device 1, antenna assembly 10, main board 20, battery 40, display screen 70, housing 90;

[0051] Middle frame 110, first side 1111, second side 1112, current weak point area 110a, current strong point area 110b, main board setting area 110c, battery setting area 110d;

[0052] Radiator 120, first open end 120a, second open end 120b, midpoint area 120d, first radiation part 121, second radiation part 122, feeding point P1, connection point P2, midpoint P3;

[0053] Feed source S0, first feed source S1, second feed source S2, first circuit M11, second circuit M12, first matching circuit M21, second matching circuit M22, switching circuit 130, inductive device 140;

[0054] First reference side 210, second reference side 220, third reference side 230, fourth reference side 240;

[0055] Frame body 310, frame 320, outer surface 320a, first gap 320b, second gap 320c, third gap 320d;

[0056] First direction D1, second direction D2. Detailed implementation

[0057] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present application without creative efforts fall within the protection scope of the present application.

[0058] Referring to "embodiment" in the present application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an exclusive, independent or alternative embodiment 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.

[0059] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example: a component or device including one or more components is not limited to the one or more components listed, but optionally further includes one or more components not listed but inherent in the product shown, or one or more components that should be possessed based on the described function.

[0060] With the development of technology, electronic devices 1 with communication functions (such as mobile phones, tablets, etc.) have been more and more widely used. Generally, the electronic device 1 includes an antenna assembly 10, and the antenna assembly 10 is used to transmit and receive electromagnetic wave signals so that the electronic device 1 can communicate with other electronic devices 1. In order to ensure the safety of the electromagnetic wave signals transmitted and received by the antenna assembly 10, SAR regulatory agencies in different countries and regions regulate the transmission power of the radio frequency signals emitted by the antenna assembly 10 during the monitoring window duration to ensure that the average specific absorption rate (also known as electromagnetic radiation absorbed by the human body) (Specific Absorption Rate, SAR) value within the monitoring window duration does not exceed the safe SAR value. However, in the related art, the average SAR value of the antenna assembly 10 when transmitting and receiving electromagnetic wave signals often exceeds the safe SAR value during the monitoring window duration, thus causing harm to the human body.

[0061] To facilitate the description of the beneficial effects of the antenna assembly 10 provided by the embodiments of the present application, the antenna assembly 10 provided in the related art (not the prior art) will be introduced first.

[0062] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 which are schematic diagrams of the antenna assembly in the related art; Figure 2 is Figure 1 a schematic diagram of the current distribution when the radiator of the antenna assembly in the related art shown in Figure 3 is Figure 1 a schematic diagram of the SAR hot spot distribution in the antenna assembly of the related art shown in . The antenna assembly 10 in the related art includes a middle frame 110, a radiator 120 and a feed source S0. The middle frame 110 includes a first side 1111 and a second side 1112 that are bent and connected, wherein the length of the first side 1111 is greater than the length of the second side 1112. The radiator 120 has a first open end 120a, a feeding point P1 and a second open end 120b. The radiator 120 is disposed corresponding to the second side 1112 of the middle frame 110. In other words, the radiator 120 in the related art is disposed on the side of the second side 1112 of the middle frame 110 away from the first side 1111. The feed source S0 is electrically connected to the feeding point P1 to excite the radiator 120 to support the first target frequency band. Specifically, the balanced mode of the radiator 120 of the antenna assembly 10 in the related art supports the first target frequency band. In the related art, the midpoint region 120d of the radiator 120 is the current peak region, and the first open end 120a and the second open end 120b of the radiator 120 are current zeros. Please refer to Figure 2 where the current I corresponding to the balanced mode of the radiator 12001 In the direction from the second open end 120b to the first open end 120a, for the sake of convenience of description. Accordingly, the current I on the middle frame 110 02 is distributed on the middle frame 110 and in the direction from the first open end 120a to the second open end 120b. Please refer to Figure 3 simultaneously. The SAR hot spot of the antenna assembly 10 in the related art corresponds to the midpoint region 120d of the radiator 120. In the schematic diagram of the present embodiment, the SAR hot spot of the antenna assembly 10 is indicated by the area where the elliptical region is located. It can be seen that for the antenna assembly 10 in the related art, the SAR hot spots of the radiator 120 are relatively concentrated. Therefore, when the antenna assembly 10 in the related art operates in the first target frequency band, the SAR value of the radiator 120 is relatively large. For the sake of convenience of description, the SAR value of the radiator 120 when the antenna assembly 10 in the related art operates in the first target frequency band is named the related SAR value, where the related SAR value is greater than or equal to the safety SAR value.

[0063] Next, the antenna assembly 10 provided by the embodiment of the present application will be introduced.

[0064] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4 which is a schematic diagram of an antenna assembly provided by an embodiment of the present application; Figure 5 is Figure 4 a schematic diagram of the current corresponding to the first resonant mode supported by the radiator in the antenna assembly shown in Figure 6 is Figure 4 a schematic diagram of the SAR hot spot distribution when the antenna assembly shown in

[0065] When the antenna assembly 10 is applied to the electronic device 1 (please refer to Figures 39 to 40 ), the middle frame 110 forms the ground pole (also known as the floor or ground system).

[0066] The middle frame 110 can be rectangular or similar to a rectangle. The length of the first side 1111 of the middle frame 110 is greater than the length of the second side 1112. Therefore, the first side 1111 is the long side of the middle frame 110, and the second side 1112 is the short side of the middle frame 110.

[0067] The radiator 120 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 (see Figures 39 to 40 ), the radiator 120 can be a Mechanical Design Antenna (MDA) radiator designed by using the metal inlay of the electronic device 1 itself. For example, the radiator 120 can be an antenna radiator designed by using the middle frame 110 formed by the plastic and metal of the electronic device 1. In addition, the radiator 120 can also be a metal frame antenna radiator designed by a metal middle frame. It can be understood that the present application does not make specific limitations on the material of the radiator 120.

[0068] The above-mentioned radiator 120 can be a line with a uniform width on the extension trajectory, or an irregular shape with a gradually changing width, a widened area, etc. and unequal widths. In the schematic diagram of this embodiment, the radiator 120 is taken as an example of a line with a uniform width on the extension trajectory for illustration. It can be understood that it should not be construed as a limitation on the embodiments of the present application.

[0069] The two ends of the radiator 120 are open-circuited, so the two ends of the radiator 120 are named as the first open-circuited end 120a and the second open-circuited end 120b respectively. The first open-circuited end 120a is an open-circuited end corresponding to the first side 1111; the second open-circuited end 120b is an open-circuited end corresponding to the second side 1112. From another dimension, the radiator 120 includes a first radiating portion 121 and a second radiating portion 122 connected by bending. The first radiating portion 121 is arranged corresponding to the first side 1111, including: the first radiating portion 121 is arranged on the side of the first side 1111 away from the second side 1112. The second radiating portion 122 is arranged corresponding to the second side 1112, including: the second radiator 120 is arranged on the side of the second side 1112 away from the first side 1111. It can be seen that the first open-circuited end 120a is located at the first radiating portion 121, and the second open-circuited end 120b is located at the second radiating portion 122. In other words, the first radiating portion 121 has the first open end 120 a , and the second radiating portion 122 has the second open end 120 b .

[0070] The first feed source S1 may be disposed on the main board 20. The first feed source S1 may be electrically connected to the feed point P1 by, but is not limited to, an elastic conductive sheet, a conductive screw, or a conductive transmission line (such as a cable) or other electrical connectors electrically connected to the feed point P1.

[0071] The first target frequency band may be, but is not limited to, an ultra high frequency (UHB) frequency band. For example, the first target frequency band may include the N78 frequency band, the N77 frequency band, or the N79 frequency band in the UHB frequency band.

[0072] See also Figure 4 , the current corresponding to the first resonant mode is a half-wavelength mode from the first open end 120a to the second open end 120b. The half-wavelength mode from the first open end 120a to the second open end 120b is also called the balanced mode or balanced mode mode of the radiator 120. In this embodiment, in the current half-wavelength period, the current corresponding to the first resonant mode is taken as an example to flow from the first open end 120a to the second open end 120b. It can be understood that in the next half-wavelength period, the current corresponding to the first resonant mode changes compared to the current in the current half-wavelength period. In the next half-wavelength period, the current corresponding to the first resonant mode flows from the second open end 120b to the first open end 120a.

[0073] The first resonance mode is a half-wavelength mode from the first open end 120a to the second open end 120b. Therefore, the first resonance mode is also referred to as the balanced mode of the entire radiator 120. Among them, the midpoint region 120d of the radiator 120 is the region with the strongest current of the resonance current corresponding to the first resonance mode, while the first open end 120a and the second open end 120b of the radiator 120 are the regions with zero current of the resonance current corresponding to the first resonance mode. Among them, the midpoint region 120d is the region including the midpoint P3 of the radiator 120, and the midpoint region 120d will be quantitatively described later. The region with the strongest current includes the maximum value of the resonance current. The region with zero current includes the zero point of the resonance current, which is also referred to as the resonance current zero point. Please refer to Figure 5 , Figure 5 In it, the current zero point is marked as Pa, and the current strong point is marked as Pb.

[0074] It should be noted that the "wavelength" in the half-wavelength mode from the first open end 120a to the second open end 120b of the first resonance mode refers to the wavelength corresponding to the center frequency point of the first target frequency band.

[0075] Please refer to Figure 6 Referring to , for the antenna assembly 10 provided by the embodiment of the present application, the radiator 120 includes a first radiation portion 121 and a second radiation portion 122 that are bent and connected. When the antenna assembly 10 supports the first target frequency band, the SAR hot spots will be dispersed into two. For the convenience of description, these two SAR hot spots are respectively named the first SAR hot spot (marked as S1 in the figure) and the second SAR hot spot (marked as S2 in the figure). Among them, the first SAR hot spot is distributed on the first radiation portion 121, and the second SAR hot spot is distributed on the second radiation portion 122. It can be seen that when the radiator 120 of the antenna assembly 10 provided by the embodiment of the present application supports the first target frequency band, the SAR hot spots are no longer concentrated, but are dispersed on the first radiation portion 121 and the second radiation portion 122. Since the SAR hot spots when the radiator 120 supports the first target frequency band are dispersed on the first radiation portion 121 and the second radiation portion 122, the SAR value of each single SAR hot spot is smaller than the SAR value in the related art. That is, the SAR value of the first SAR hot spot (marked as S1 in the figure) is smaller than the SAR value in the related art; the SAR value of the second SAR hot spot (marked as S2 in the figure) is smaller than the SAR value in the related art.

[0076] In summary, for the antenna assembly 10 provided by the embodiment of the present application, the radiator 120 of the antenna assembly 10 includes a first radiation portion 121 and a second radiation portion 122 that are bent and connected. Therefore, when the radiator 120 supports the first target frequency band and operates in the half-wavelength mode from the first open end 120a to the second open end 120b, the SRA hot spots of the antenna assembly 10 are no longer concentrated in one place, but are dispersed in the first radiation portion 121 and the second radiation portion 122. Since the SAR hot spots are dispersed, the SAR value of the first SAR hot spot of the first radiation portion 121 is low, and the SAR value of the second SAR hot spot of the second radiation portion 122 is low. It can be seen that the antenna assembly 10 provided by the embodiment of the present application has a low SAR value when supporting the first target frequency band. When communicating using the first target frequency band, the harm to the human body is small or even negligible.

[0077] In one embodiment, the first feeder S1 is further configured to excite the radiator 120 to support a second target frequency band, where the second target frequency band includes a first frequency band and a second frequency band.

[0078] The first feeder S1 further excites the radiator 120 to support the second target frequency band. In other words, the first feeder S1 not only excites the radiator 120 to support the first target frequency band, but also excites the radiator 120 to support the second target frequency band. Therefore, the antenna assembly 10 can support the first target frequency band and the second target frequency band, and the antenna assembly 10 can communicate with other antennas using the first target frequency band and the second target frequency band, having a good communication effect.

[0079] In one embodiment, the second target frequency band is a Wireless Fidelity (WiFi) frequency band. The first frequency band is the WiFi 2.4G frequency band, and the second frequency band is the WiFi 5G frequency band. Therefore, the antenna assembly 10 can meet the communication requirements of the WiFi 2.4G frequency band and the WiFi 5G frequency band.

[0080] Please refer to Figure 4 、 Figure 7 and Figure 8 , Figure 7 for Figure 4 the schematic diagram of the size identification of the relevant parts of the radiator in the antenna assembly shown in Figure 8 and Figure 4 the schematic diagram of the current distribution when the antenna assembly shown in supports the first frequency band. The feeding point P1 is located on the first radiation portion 121, and the stub length from the feeding point P1 to the first open end 120a is d 11The branch length from the feeding point P1 to the second open end 120b is d 12 , d 11 <d 12 The first feed source S1 is further used to generate a second excitation signal, and the second excitation signal is used to excite the radiator 120 to generate a second resonance mode supporting the first frequency band, wherein the second resonance mode is a quarter-wavelength mode from the feeding point P1 to the second open end 120b.

[0081] The feeding point P1 is located at the first radiating portion 121 , and the first radiating portion 121 is disposed corresponding to the first side 1111 . Therefore, the feeding point P1 is disposed corresponding to the first side 1111 .

[0082] The branch length from the feed point P1 to the first open end 120a refers to the length from the feed point P1 to the end face of the first open end 120a away from the second radiating portion 122. 12 The length L of the second radiation portion 122 is 11 The length L from the feeding point P1 to the connection between the first radiating portion 121 and the second radiating portion 122 12 In other words, d 12 =L 11 +L 12 .d 11 <d 12 It can be seen that the branch from the feeding point P1 to the first open end 120a is a short branch, and the branch from the feeding point P1 to the second open end 120b is a long branch.

[0083] The second resonance mode is a quarter-wavelength mode from the feeding point P1 to the second open-circuit end 120b, that is, the second resonance mode is a quarter-wavelength mode of the long branch of the radiator 120. Figure 8 In the figure, the current zero point is marked as Pa and the current strong point is marked as Pb. In other words, when the antenna assembly 10 supports the first frequency band, it is a monopole mode from the feed point P1 to the end of the long branch of the radiator 120. The quarter-wavelength mode is also called the fundamental mode. When the second resonant mode is a quarter-wavelength mode from the feed point P1 to the second open end 120b, the antenna assembly 10 works in the fundamental mode when supporting the first frequency band, and has a higher radiation efficiency.

[0084] It should be noted that the "wavelength" in the quarter-wavelength mode from the feeding point P1 to the second open end 120b of the second resonance mode refers to the wavelength corresponding to the center frequency point of the first frequency band.

[0085] Please refer to Figure 4 and Figure 9 , Figure 9 is Figure 4 a schematic diagram of the current distribution when the antenna assembly shown supports the second frequency band. Further, the first feed source S1 is also used to generate a third excitation signal, and the third excitation signal is also used to excite the radiator 120 to generate a third resonance mode that supports the second frequency band, where the third resonance mode is a quarter-wavelength mode from the feeding point P1 to the first open end 120a.

[0086] As introduced above, the stub from the feeding point P1 to the first open end 120a is a short stub, and the stub from the feeding point P1 to the second open end 120b is a long stub.

[0087] The third resonance mode is a quarter-wavelength mode from the feeding point P1 to the first open end 120a. That is, the third resonance mode is a quarter-wavelength mode of the short stub of the radiator 120. In Figure 9 , the current zero point is marked as Pa, and the current strong point is marked as Pb. In other words, when the antenna assembly 10 supports the second frequency band, it is a monopole mode from the feeding point P1 to the end of the short stub of the radiator 120. The quarter-wavelength mode is also called the fundamental mode. When the third resonance mode is a quarter-wavelength mode from the feeding point P1 to the first open end 120a, the antenna assembly 10 operates in the fundamental mode when supporting the second frequency band and has a high radiation efficiency.

[0088] It should be noted that the "wavelength" in the quarter-wavelength mode from the feeding point P1 to the first open end 120a of the third resonance mode refers to the wavelength corresponding to the center frequency point of the second frequency band.

[0089] Further, please refer to Figure 4 and Figure 7 again. The length L 11 of the second radiation part 122 satisfies: where λ1 is the wavelength corresponding to the center frequency point of the first target frequency band. The length L 12 from the feeding point P1 to the connection point of the first radiation part 121 and the second radiation part 122 satisfies: Among them, λ2 is the wavelength corresponding to the center frequency point of the first frequency band in the second target frequency band. The length d from the feeding point P1 to the first open end 120a 11 satisfies: Among them, λ3 is the wavelength corresponding to the center frequency point of the second frequency band in the second target frequency band.

[0090] The above L 11 , L 12 , d 11 can be selected in such a way that the first resonance mode, the second resonance mode and the third resonance mode can be better excited.

[0091] Please refer to Figure 10 and Figure 11 , Figure 10 which is a schematic diagram of an antenna assembly provided by another embodiment of the present application; Figure 11 is Figure 10 a schematic diagram of the size identification of the relevant part of the radiator in the antenna assembly shown in. In this embodiment, the feeding point P1 is located on the second radiation part 122, and the stub length from the feeding point P1 to the first open end 120a is d 21 , and the stub length from the feeding point P1 to the second open end 120b is d 22 , d 21 > d 22 . Among them, the second excitation signal is used to excite the radiator 120 to generate a second resonance mode that supports the first frequency band, and the second resonance mode is a quarter-wavelength mode from the feeding point P1 to the first open end 120a.

[0092] The feeding point P1 is located on the second radiation part 122, and the second radiation part 122 corresponds to the second side 1112, so the feeding point P1 corresponds to the second side 1112.

[0093] The stub length d from the feeding point P1 to the first open end 120a 21 means the length L 12 from the feeding point P1 to the connection point of the first radiation part 121 and the second radiation part 122 21 and the length L 21 of the first radiation part 121. In other words, d 12 = L 21 + L 21 . The stub length from the feeding point P1 to the second open end 120b means the length from the feeding point P1 to the end face of the second open end 120b away from the first radiation part 121. d 22, It can be seen that the stub from the feeding point P1 to the first open end 120a is a long stub, and the stub from the feeding point P1 to the second open end 120b is a short stub.

[0094] The second resonance mode is the quarter - wavelength mode from the feeding point P1 to the first open end 120a. That is to say, the second resonance mode is the quarter - wavelength mode of the long stub of the radiator 120. In other words, when the antenna assembly 10 supports the first frequency band, it is the monopole mode from the feeding point P1 to the end of the long stub of the radiator 120. The quarter - wavelength mode is also called the fundamental mode. When the second resonance mode is the quarter - wavelength mode from the feeding point P1 to the first open end 120a, the antenna assembly 10 operates in the fundamental mode when supporting the first frequency band and has a high radiation efficiency.

[0095] It should be noted that the "wavelength" in the second resonance mode being the quarter - wavelength mode from the feeding point P1 to the first open end 120a refers to the wavelength corresponding to the center frequency point of the first frequency band.

[0096] Furthermore, the first feed source S1 is also used to generate a third excitation signal, and the third excitation signal is used to excite the radiator 120 to generate a third resonance mode that supports the second frequency band, where the third resonance mode is the quarter - wavelength mode from the feeding point P1 to the second open end 120b.

[0097] As introduced before, the stub from the feeding point P1 to the first open end 120a is a long stub, and the stub from the feeding point P1 to the second open end 120b is a short stub.

[0098] The third resonance mode is the quarter - wavelength mode from the feeding point P1 to the second open end 120b. That is to say, the third resonance mode is the quarter - wavelength mode of the short stub of the radiator 120. In other words, when the antenna assembly 10 supports the second frequency band, it is the monopole mode from the feeding point P1 to the end of the short stub of the radiator 120. The quarter - wavelength mode is also called the fundamental mode. When the third resonance mode is the quarter - wavelength mode from the feeding point P1 to the second open end 120b, the antenna assembly 10 operates in the fundamental mode when supporting the second frequency band and has a high radiation efficiency.

[0099] It should be noted that the "wavelength" in the third resonance mode being the quarter - wavelength mode from the feeding point P1 to the second open end 120b refers to the wavelength corresponding to the center frequency point of the second frequency band.

[0100] Please further refer to Figure 10 and Figure 11 such that the length L of the first radiation portion 121 21 satisfies: where λ1 is the wavelength corresponding to the center frequency point of the first target frequency band. The length L from the feeding point P1 to the connection point of the first radiation portion 121 and the second radiation portion 122 12 satisfies: where λ 21 is the wavelength corresponding to the center frequency point of the first frequency band in the second target frequency band. The length d from the feeding point P1 to the second open end 120b 22 satisfies: where λ 22 is the wavelength corresponding to the center frequency point of the second frequency band in the second target frequency band.

[0101] Please refer to Figure 12 and Figure 13 , Figure 12 which is a schematic diagram of an antenna assembly provided by another embodiment of the present application; Figure 13 which is a schematic diagram of an antenna assembly provided by another embodiment of the present application. The radiator 120 further has a connection point P2, and the connection point P2 is spaced apart from the feeding point P1. The antenna assembly 10 further includes a first circuit M11. One end of the first circuit M11 is electrically connected to the connection point P2, and the other end is grounded. The first circuit M11 is a band-pass circuit for the first target frequency band and a band-stop filter circuit for the second target frequency band.

[0102] Since the first circuit M11 is a band-pass circuit for the first target frequency band and a band-stop filter circuit for the second target frequency band, the first circuit M11 can pass the excitation signal of the first target frequency band, and the first path blocks the excitation signal of the second target frequency band. Specifically, for the first target frequency band, the first circuit M11 is conductive; for the second target frequency band, the first circuit M11 is non-conductive. Thus, the interference of the excitation signal of the second target frequency band on the antenna assembly 10 supporting the first target frequency band can be reduced or even avoided. In addition, for the first frequency band of the second target frequency band, the first circuit M11 can be equivalent to a capacitor with a very small resistance value.

[0103] Please further refer to Figure 14 , Figure 14 which is Figure 12 a schematic diagram of the size identification of some components of the antenna assembly shown in. The radiator 120 further has a midpoint P3. The distance d3 from the connection point P2 to the midpoint P3 satisfies: Wherein, λ1 is the wavelength corresponding to the center frequency point of the first target frequency band.

[0104] The connection point P2 can coincide with the midpoint P3, or there can be a certain distance between the connection point P2 and the midpoint P3, and the distance is less than or equal to

[0105] The d3 can be, but is not limited to, 0, or or or or etc., and the embodiments of the present application do not limit this. As long as the distance d3 from the connection point P2 to the midpoint satisfies: That's all.

[0106] The distance d3 from the connection point P2 to the midpoint P3 satisfies: It can better create the boundary condition that the midpoint P3 of the antenna radiator 120 is a current strong point, so that when the radiator 120 supports the first target frequency band, it can better support the first resonance mode as a half-wavelength mode from the first open end 120a to the second open end 120b. Furthermore, when the antenna assembly 10 supports the first target frequency band, it has better communication effects.

[0107] Please refer to Figure 15 and Figure 16 , Figure 15 For the schematic diagram of the antenna assembly provided by another embodiment of the present application; Figure 16 For the schematic diagram of the antenna assembly provided by another embodiment of the present application. The antenna assembly 10 further includes a second circuit M12. One end of the second circuit M12 is electrically connected to the first feed source S1, and the other end of the second circuit M12 is electrically connected to the feeding point P1. The second circuit M12 is used to tune the first target frequency band supported by the antenna assembly 10.

[0108] The antenna assembly 10 further including the second circuit M12 can be combined into the antenna assembly 10 provided in any of the previous embodiments. The antenna assembly 10 shown in the schematic diagram of the embodiments of the present application should not be construed as a limitation on the antenna assembly 10 provided by the embodiments of the present application.

[0109] The antenna assembly 10 provided in this embodiment further includes a second circuit M12. The second circuit M12 tunes the first target frequency band, which can enable the antenna assembly 10 to have better communication performance when supporting the first target frequency band.

[0110] Please refer to Figure 17 and Figure 18 , Figure 17Schematic diagram of an antenna assembly provided by another embodiment of the present application; Figure 18 Schematic diagram of an antenna assembly provided by another embodiment of the present application. The antenna assembly 10 includes a middle frame 110, a radiator 120, and a first feeder S1. The middle frame 110 includes a first side 1111 and a second side 1112 that are bent and connected, wherein the length of the first side 1111 is greater than the length of the second side 1112. The radiator 120 includes a first radiation portion 121 and a second radiation portion 122 that are bent and connected. In addition, the radiator 120 further has a feeding point P1. The first radiation portion 121 has a first open end 120a, and the first radiation portion 121 is disposed corresponding to the first side 1111. The second radiation portion 122 has a second open end 120b, and the second radiation portion 122 is disposed corresponding to the second side 1112. The first feeder S1 is electrically connected to the feeding point P1, and the first feeder S1 is used to generate a first excitation signal to excite the radiator 120 to generate a first resonance mode that supports a first target frequency band, wherein the first resonance mode is a half-wavelength mode from the first open end 120a to the second open end 120b.

[0111] Further, the antenna assembly 10 further includes a first matching circuit M21 and a second feeder S2. The first feeder S1 is electrically connected to the first matching circuit M21 to the feeding point P1. The second feeder S2 is used to generate a fourth excitation signal. The second feeder S2 is electrically connected to the feeding point P1 to excite the radiator 120 to support a third target frequency band. Wherein, the first matching circuit M21 is a band-pass filter circuit for the first target frequency band and the second target frequency band, and the first matching circuit M21 is a band-stop filter circuit for the third target frequency band.

[0112] In one embodiment, the first target frequency band is the UHB frequency band, for example, the N78 frequency band. The second target frequency band is the WiFi frequency band. In the second target frequency band, the first frequency band is the WiFi 2.4G frequency band, and the second frequency band is the WiFi 5G frequency band. The third target frequency band may be, but is not limited to, the low frequency band (Low Band, LB).

[0113] The first matching circuit M21 is a band-pass filter circuit for the first target frequency band and the second target frequency band, and the first matching circuit M21 is a band-stop filter circuit for the third target frequency band. Therefore, the first matching circuit M21 can pass the first target frequency band and the second target frequency band, and the first matching circuit M21 is used to block the third target frequency band. Therefore, the interference of the third target frequency band on the first target frequency band and the second target frequency band can be reduced or even avoided, so that the antenna assembly 10 has a better communication effect in the first target frequency band and the second target frequency band.

[0114] The antenna assembly 10 further includes a switching switch (Tunner) SW and a second matching circuit M22. The switching switch SW is used to operate in different sub-frequency bands when the third target frequency band supported by the antenna assembly according to preset configuration parameters. The second matching circuit M22 is connected in series with the switching switch SW to form a series unit. The second matching circuit M22 is a band-stop filter circuit for the first target frequency band and the second target frequency band, and the second matching circuit M22 is a band-pass filter circuit for the third target frequency band.

[0115] In the schematic diagram of this embodiment, it is exemplified that one end of the switching switch SW is electrically connected to the second feed source S2, and the other end of the switching switch SW is electrically connected to the second matching circuit M22 to the feeding point P1. Heat transfer along, the second feed source S2 is sequentially electrically connected to the switching switch SW and the second matching circuit M22 to the feeding point P1. It can be understood that in other embodiments, the second feed source S2 is sequentially electrically connected to the second matching circuit M22 and the switching switch SW to the feeding point P1.

[0116] The switching switch SW is used to operate in different sub-frequency bands when the third target frequency band supported by the antenna assembly 10 according to preset configuration parameters. In one embodiment, the switching switch SW may include a switch and a plurality of matching sub-circuits. When the switch is electrically connected to different matching sub-circuits, the sub-frequency bands of the third target frequency band supported by the antenna assembly 10 are different. Thus, it can be seen that by controlling the switching switch SW, the antenna assembly 10 can be made to operate in different sub-frequency bands of the third target frequency band.

[0117] Please refer to Figure 19 and Figure 20 , Figure 19 is a schematic diagram of an antenna assembly provided by another embodiment of the present application; Figure 20 is Figure 19Partial structural schematic diagram of the antenna assembly shown. The radiator 120 is spaced apart from the middle frame 110. The middle frame 110 further has a current weak point area 110a of characteristic mode current. The orthographic projection of the feeding point P1 on the middle frame 110 is located within the current weak point area 110a.

[0118] Please refer to Figure 21 and Figure 22 , Figure 21 which is a schematic diagram of the antenna assembly provided by another embodiment of the present application; Figure 22 is Figure 21 Partial structural schematic diagram of the antenna assembly shown. The radiator 120 is spaced apart from the middle frame 110. The middle frame 110 further has a current weak point area 110a of characteristic mode current. The orthographic projection of the feeding point P1 on the middle frame 110 is located within the current weak point area 110a.

[0119] It can be understood that the schematic diagram of the antenna assembly 10 provided by the above embodiment should not be construed as a limitation to the antenna assembly 10 provided by the embodiments of the present application.

[0120] The working principle of the antenna assembly 10 provided by the embodiments of the present application will be described and explained below.

[0121] In this embodiment, the middle frame 110 is the ground plane of the electronic device 1, and the characteristic mode is the inherent mode of the ground plane. By analyzing the characteristic mode (also known as the characteristic mode) of the ground plane, according to the boundary conditions, the most suitable feeding position can be found. The following takes the example that the first frequency band supported by the antenna assembly 10 is relatively low. Through simulation, the characteristic current with the largest proportion of longitudinal current mode can be obtained. Please refer to Figure 23 and Figure 24 , Figure 23 which is a schematic diagram of the distribution of the characteristic current with the largest proportion of longitudinal current corresponding to the characteristic mode of the middle frame; Figure 24 is Figure 23 Schematic diagram of the current weak point area and current strong point area in the middle frame shown. The current distribution of the characteristic mode is mainly characterized by the sine behavior of the edge of the ground plane. As can be seen from Figure 23 , the characteristic mode has a maximum and a minimum of current distribution at specific positions. In addition to the current distribution, the voltage distribution, that is, the electric field distribution on the ground plane, can also be considered. The phase difference between the electric field distribution in the ground plane and the phase of the current distribution is 90°. That is, the minimum value of the electric field distribution in the ground plane is the same as the maximum value of the current distribution in the ground plane; conversely, the maximum value of the electric field distribution in the ground plane is the same as the minimum value of the current distribution in the ground plane. In Figure 23In [reference], the curve J next to the middle frame 110 is used to represent the current distribution of the floor, and the curve V is used to represent the voltage distribution of the floor. The curve J shows that the current distribution of the floor is a sine distribution. As can be seen from the curve J, the two ends of the floor are the places where the current is the smallest, and the middle position of the floor is the place where the current is the strongest. The curve V represents that the electric field distribution of the floor is a cosine distribution. Therefore, an inductive coupling element (ICE) can be placed at the maximum position of the characteristic mode current distribution of the floor (i.e., the place where the electric field distribution of the floor is the smallest) to excite the characteristic mode; or, a capacitive coupling element (CCE) can be placed at the minimum position of the characteristic mode current distribution of the floor (i.e., the place where the electric field distribution of the floor is the largest) to excite the characteristic mode. Please refer to Figure 24 , in Figure 24 , there are a current weak point area 110a of the characteristic mode current distribution of the floor and a current strong point area 110b of the characteristic mode current distribution of the floor. However, the size of the ICE is usually large and not easy to implement; the size of the CCE is relatively small and easy to implement. Therefore, the CCE is used for feeding in this case. In addition, if you want the antenna assembly 10 to obtain higher radiation efficiency, it is necessary to better excite the longitudinal current distribution on the middle frame 110. It should be noted that when using the CCE for feeding, in addition to setting the feeding point P1 at the minimum of the characteristic mode current of the floor, the area around the minimum of the characteristic mode current in the current weak point area 110a of the characteristic mode of the floor and adjacent to the minimum of the characteristic mode current is also acceptable. Therefore, the minimum of the characteristic mode current and the area around the minimum of the characteristic mode current adjacent thereto are named the current weak point area 110a. In other words, the so-called current weak point area 110a of the characteristic mode current of the floor refers to the area including the minimum of the characteristic mode current of the floor, and the current weak point area 110a provided by the embodiment of the present application will be quantified later. The so-called current strong point area 110b of the characteristic mode current of the floor refers to the area including the maximum of the characteristic mode of the floor.

[0122] In this embodiment, the radiator 120 is spaced apart from the middle frame 110, and the orthographic projection of the feeding point P1 on the middle frame 110 is located in the current weak point area 110a. Therefore, the radiator 120 excited by the first feed source S1 serves as a radiation driving device to form a CCE.

[0123] In the embodiment of the present application, the number of the current weak point areas 110a of the floor is four. The orthographic projection of the feeding point P1 on the floor can be located in any one of the four current weak point areas 110a of the characteristic mode current of the floor.

[0124] In the antenna assembly 10 provided by the embodiment of the present application, the floor (the middle frame in this embodiment) constitutes the main radiation branch of the third target frequency band, contributing most of the radiation of the antenna assembly 10, while the radiator 120 acts as the radiation driving device of the entire antenna assembly 10, becoming the excitation condition for the middle frame 110 to operate in the third target frequency band, and the energy ratio of the radiator 120 is very small. Therefore, in this case, reducing the size of the radiator 120 has little impact on the overall radiation performance of the antenna assembly 10. It can be seen that the radiator 120 described above excites the current of the floor, the floor constitutes the main branch supporting the third target frequency band, and the radiator 120 acts as the radiation driving device. Reducing the size (usually the length) of the radiator 120 will not affect the radiation efficiency. Therefore, in the antenna assembly 10 provided by the embodiment of the present application, the size of the radiator 120 is small. Compared with the related art, the length of the radiator 120 of the antenna assembly 10 provided by the embodiment of the present application is reduced by about 40%, providing more possibilities for the layout of the antenna assembly 10 in the electronic device 1 and improving the flexibility of the antenna design in the electronic device 1.

[0125] The antenna assembly 10 further includes an inductive device 140. One end of the inductive device 140 is electrically connected to the first feed source S1, and the other end of the inductive device 140 is electrically connected to the feeding point P1. The electrical length of the radiator 120 satisfies: where λ3 is the wavelength corresponding to the center frequency point of the third target frequency band.

[0126] Next, the principles used in the antenna assembly 10 provided by each embodiment of the present application will be introduced. Please refer to Figure 25 and Figure 26 , Figure 25 which is a schematic diagram of an antenna assembly in one embodiment; Figure 26 which is a schematic diagram of an antenna assembly including an inductive device. Among them, Figure 26 in (a) is a schematic diagram of the antenna assembly 10 without the inductive device 140; Figure 26 in (b) is a schematic diagram of the antenna assembly 10 with the inductive device 140. The antenna assembly 10 includes a radiator 120, a feed source S0, and an inductive device 140. The radiator 120 has a feeding point P1. One end of the inductive device 140 is electrically connected to the feed source S0, and the other end of the inductive device 140 is electrically connected to the feeding point P1. As can be seen from Figure 26 it can be seen that Figure 26 the length of the radiator 120 of the antenna assembly 10 including the inductive device 140 in (b) of

[0127] In this embodiment, one end of the inductive device 140 in the antenna assembly 10 is electrically connected to the feed source S0, and the other end is electrically connected to the feeding point P1. This is equivalent to connecting the feed source S0 in series with the inductive device 140 to the feeding point P1 of the radiator 120.

[0128] It should be noted that the so-called inductive device 140 refers to a device that exhibits inductive characteristics within the target frequency band supported by the antenna assembly 10. The inductive device 140 may include at least one of the following cases: a single inductor; a series connection of multiple inductors; a parallel connection of multiple inductors; a series connection of a capacitor and an inductor; a parallel connection of a capacitor and an inductor, as long as the inductive device 140 exhibits inductive characteristics within the target frequency band supported by the antenna assembly 10.

[0129] As introduced above, when the orthographic projection of the feeding point P1 on the floor (the middle frame 110 in this embodiment) is located in the current weak point region 110a of the characteristic mode of the floor, an exciting current with the same extension direction along the first side 1111 can be better excited. The floor constitutes the main radiation branch of the target frequency band and contributes most of the radiation of the antenna assembly 10, while the radiator 120 acts as the radiation driving device of the entire antenna assembly 10 and becomes the excitation condition for the floor to operate in the target frequency band. The energy ratio of the radiator 120 is very small. Therefore, in this case, reducing the size of the radiator 120 has little impact on the overall radiation performance of the antenna assembly 10.

[0130] Furthermore, from Figure 26 it can also be seen that the size of the radiator 120 in the antenna assembly 10 provided with the inductive device 140 is small.

[0131] In addition, the inductive device 140 can make up for the lack of inductance caused by the miniaturization of the size of the radiator 120, enabling the antenna assembly 10 to have good antenna performance in the target frequency band and enabling the antenna assembly 10 to operate well in the target frequency band.

[0132] Please refer to Figure 27 , Figure 27 which is a schematic diagram of the antenna assembly provided by an embodiment of the present application. In this embodiment, the antenna assembly 10 includes an inductive device 140. One end of the inductive device 140 is electrically connected to the first feed source S1, and the other end of the inductive device 140 is electrically connected to the feeding point P1.

[0133] The inductive device 140 may be, but is not limited to, a lumped inductor. In the antenna assembly 10 provided by the embodiment of the present application, since the antenna assembly 10 includes the inductive device 140, the size of the radiator 120 can be further reduced.

[0134] In addition, the inductive device 140 can compensate for the lack of inductance caused by the miniaturization of the size of the radiator 120, so that the antenna assembly 10 has good antenna performance in the third target frequency band, and enables the antenna assembly 10 to operate well in the third target frequency band.

[0135] In this embodiment, an example is given with the inductive device 140 including an inductor. In other embodiments, the inductor satisfies at least one of the following conditions: a single inductor; a series connection of multiple inductors; a parallel connection of multiple inductors. As long as the inductor exhibits inductive characteristics within the third target frequency band supported by the antenna assembly 10.

[0136] Furthermore, the electrical length of the radiator 120 in the third target frequency band satisfies: where λ3 is the wavelength corresponding to the center frequency point of the third target frequency band.

[0137] The radiator 120 is in an open - circuit state at both ends. Considering the requirement of miniaturization of the radiator 120, the electrical length of the radiator 120 is selected as: At the same time, considering that the physical length of the inductive device 140 replacing the radiator 120 is too large, which will introduce more energy loss. Therefore, the electrical length of the radiator 120 is selected as In summary, the electrical length of the radiator 120 provided by the embodiment of the present application satisfies: On the one hand, it can make the size of the radiator 120 smaller, and on the other hand, it can make the antenna assembly 10 have less energy loss when supporting the third target frequency band.

[0138] It should be noted that the electrical length of the radiator 120 satisfies the following formula:

[0139] where L is the physical length of the radiator 120, a is the time for the electromagnetic wave signal in the third target frequency band to transmit in the radiator 120, and b is the time for the electromagnetic wave signal in the third target frequency band to transmit in free space.

[0140] Please refer to Figure 24 , in one embodiment, the current weak point area 110a is located within a square area with the intersection of the extension lines of the first side 1111 and the second side 1112 as the vertex and with a side length of 1 / 16 of the wavelength of the third target frequency band.

[0141] In another embodiment, the current weak point area 110a is located within a region centered at the intersection of the extension lines of the first side 1111 and the second side 1112, with a radius of 1 / 16 of the wavelength of the third target frequency band.

[0142] Please further refer to Figure 24 , the middle frame 110 includes a first side 1111 and a second side 1112 that are bent and connected. Among them, the length of the first side 1111 is greater than the length of the second side 1112. That is, the first side 1111 is the long side of the middle frame 110, and the second side 1112 is the short side of the middle frame 110. Further, in this embodiment, the middle frame 110 includes two first sides 1111 arranged back to back and two second sides 1112 arranged back to back. The number of current weak point areas 110a is four, and the orthographic projection of the feeding point P1 on the middle frame 110 is located in any one of the four current weak point areas 110a.

[0143] Please refer to Figure 24 , in the schematic diagram of this embodiment, the current weak point area 110a is located within a square region with a vertex at the intersection of the extension lines of the first side 1111 and the second side 1112 and a side length of 1 / 16 of the wavelength of the third target frequency band. In this embodiment, the connection between the first side 1111 and the second side 1112 is taken as a right angle for illustration. When the connection between the first side 1111 and the second side 1112 is a right angle, the intersection of the extension lines of the first side 1111 and the second side 1112 is located on the first side 1111 and on the second side 1112.

[0144] When the current weak point area 110a is selected as a square region with a vertex at the intersection of the extension lines of the first side 1111 and the second side 1112 and a side length of 1 / 16 of the wavelength of the third target frequency band, therefore, the current within the current weak point area 110a is relatively weak. Setting the orthographic projection of the feeding point P1 on the middle frame 110 within the current weak point area 110a can further better excite a resonant current along the same extension direction of the first side 1111, so that the antenna assembly 10 has a higher radiation efficiency in the third target frequency band.

[0145] In this embodiment, the number of the current weak regions 110a is four, and the orthographic projection of the feeding point P1 on the middle frame 110 can be located in any one of the four current weak regions 110a, which enables a relatively flexible setting of the feeding point P1. For the convenience of description, the current weak regions 110a are respectively named as current weak region 110a(1), current weak region 110a(2), current weak region 110a(3), and current weak region 110a(4). For example, in this embodiment, the orthographic projection of the feeding point P1 on the middle frame 110 is located in the current weak region 110a(1).

[0146] Please refer to Figure 28 , Figure 28 FIG. is a schematic diagram of a current weak region in an antenna assembly provided for another embodiment. The middle frame 110 includes a first side 1111 and a second side 1112 that are bent and connected, wherein the length of the first side 1111 is greater than the length of the second side 1112. The current weak region 110a is located in a region with the intersection point of the extension line of the first side 1111 and the extension line of the second side 1112 as the center O and with a radius R of 1 / 16 of the wavelength of the third target frequency band.

[0147] In the schematic diagram of this embodiment, the connection part of the first side 1111 and the second side 1112 is taken as an example of an arc for illustration. The center O is the intersection point of the extension line of the first side 1111 and the extension line of the second side 1112, and the center O is located outside the first side 1111 and the second side 1112. When the connection part of the first side 1111 and the second side 1112 is a right angle, the intersection point of the extension line of the first side 1111 and the extension line of the second side 1112 is located on the first side 1111 and on the second side 1112.

[0148] The orthographic projection of the feeding point P1 on the middle frame 110 is located in the current weak region 110a and in a circular region with the intersection point as the center O and with a radius R of 1 / 16 of the wavelength of the third target frequency band. Thus, it can be seen that the current weak region 110a where the orthographic projection of the feeding point P1 on the middle frame 110 is located is a sector or a sector-like shape.

[0149] In this embodiment, the number of the current weak regions 110a is four, and the orthographic projection of the feeding point P1 on the middle frame 110 can be located in any one of the four current weak regions 110a, which enables the setting of the feeding point P1 to be relatively flexible. For example, the orthographic projection of the feeding point P1 on the middle frame 110 is located in the current weak region 110a. For the convenience of description, the current weak regions 110a are respectively named as current weak region 110a(1), current weak region 110a(2), current weak region 110a(3), and current weak region 110a(4). For example, in this embodiment, the orthographic projection of the feeding point P1 on the middle frame 110 is located in the current weak region 110a(1).

[0150] When the current weak region 110a is selected as the region with the intersection point of the extension line of the first side 1111 and the extension line of the second side 1112 as the center O and with a radius R of 1 / 16 of the wavelength of the third target frequency band, therefore, the current in this region is relatively weak. Setting the orthographic projection of the feeding point P1 on the middle frame 110 within the current weak region 110a can further better excite the resonant current in the same direction as the extension direction of the first side 1111, so that the antenna assembly 10 has a higher radiation efficiency in the third target frequency band.

[0151] It should be noted that Figure 24 and Figure 28 The selected ranges of the current weak regions 110a shown in these two embodiments are basically the same, and both the current minimum value and the surrounding region of the current minimum value are included in the current weak regions 110a in these two embodiments.

[0152] In summary, the middle frame 110 includes two first sides 1111 arranged opposite to each other and two second sides 1112 arranged opposite to each other. The number of the current weak regions 110a is four, and the orthographic projection of the feeding point P1 on the middle frame 110 is located in any one of the four current weak regions 110a.

[0153] In one embodiment, the first target frequency band is the UHB frequency band, the second target frequency band is the WiFi frequency band, the first frequency band of the second target frequency band is the WiFi 2.4G frequency band, and the second frequency band of the second target frequency band is the WiFi 5G frequency band.

[0154] In this embodiment, the first target frequency band is the UHB frequency band, the second target frequency band is the WiFi frequency band, the first frequency band of the second target frequency band is the WiFi 2.4G frequency band, and the second frequency band of the second target frequency band is the WiFi 5G frequency band. Therefore, the communication requirements of the antenna assembly 10 in the UHB frequency band, the WiFi 2.4G frequency band, and the WiFi 5G frequency band can be satisfied.

[0155] In one embodiment, the first target frequency band is the UHB frequency band, the second target frequency band is the WiFi frequency band, the first frequency band of the second target frequency band is the WiFi 2.4G frequency band, the second frequency band of the second target frequency band is the WiFi 5G frequency band, and the third target frequency band is the LB frequency band. To meet the communication requirements of the antenna assembly 10 in the UHB frequency band, the WiFi 2.4G frequency band, the WiFi 5G frequency band, and the LB frequency band.

[0156] Next, the performance of the antenna assembly 10 provided by the embodiment of the present application will be simulated.

[0157] Please refer to Figure 29 , Figure 29 For Figure 4 the schematic diagram of the S11 curve of the antenna assembly shown. In this schematic diagram, the abscissa is the frequency, with the unit of GHz; the ordinate is the S parameter, with the unit of dB. When the impedance matching of the antenna assembly 10 is good, the resonances of the antenna assembly 10 in the first target frequency band, and in the first frequency band and the second frequency band of the second target frequency band are effectively excited. Therefore, the antenna assembly 10 can support the first target frequency band, the first frequency band of the second target frequency band, and the second frequency band of the second target frequency band. In this embodiment, the first target frequency band is the N78 frequency band of UHB, the first frequency band is the WiFi 2.4G frequency band, and the second frequency band is the WiFi 5G frequency band.

[0158] Please refer to together Figure 30 , Figure 30 For Figure 4Efficiency simulation diagram of the antenna assembly shown. In this schematic diagram, the abscissa is frequency, with the unit of GHz; the ordinate is efficiency, with the unit of dB. Among them, curve ① is the system radiation efficiency (SystemRad.Efficiency) curve of the antenna assembly 10; curve ② is the system total efficiency (SystemTot.Efficiency) curve of the antenna assembly 10. It can be seen from this simulation diagram that the antenna assembly 10 has effective radiation efficiency and effective system total efficiency in the first target frequency band, which is also called having qualified radiation efficiency and efficiency bandwidth. Correspondingly, it can be seen from this simulation diagram that the antenna assembly 10 has effective radiation efficiency and effective system total efficiency in the first frequency band of the second target frequency band, which is also called having qualified radiation efficiency and efficiency bandwidth. It can be seen from this simulation diagram that the antenna assembly 10 has effective radiation efficiency and effective system total efficiency in the second frequency band of the second target frequency band, which is also called having qualified radiation efficiency and efficiency bandwidth.

[0159] Please refer to Figure 31 , Figure 31 is Figure 13 Schematic diagram of the S11 curve of the antenna assembly shown. In this schematic diagram, the abscissa is frequency, with the unit of GHz; the ordinate is the S parameter, with the unit of dB. When the impedance matching of the antenna assembly 10 is good, the resonances of the antenna assembly 10 in the first target frequency band (labeled as a in the figure), in the first frequency band of the second target frequency band (labeled as b in the figure), and in the second frequency band of the second target frequency band (labeled as c in the figure) are all effectively excited. Therefore, the antenna assembly 10 can support the first target frequency band, the first frequency band of the second target frequency band, and the second frequency band of the second target frequency band. In this embodiment, the first target frequency band is the N78 frequency band of UHB, the first frequency band is the WiFi 2.4G frequency band, and the second frequency band is the WiFi 5G frequency band.

[0160] Please refer to Figure 32 , Figure 32 is Figure 13Efficiency simulation diagram of the antenna assembly shown. In this schematic diagram, the abscissa is frequency, with the unit of GHz; the ordinate is efficiency, with the unit of dB. Among them, curve ① is the system radiation efficiency (SystemRad.Efficiency) curve of the antenna assembly 10; curve ② is the system total efficiency (SystemTot.Efficiency) curve of the antenna assembly 10. It can be seen from this simulation diagram that the antenna assembly 10 has effective radiation efficiency and effective system total efficiency in the first target frequency band, which is also called having qualified radiation efficiency and efficiency bandwidth. Correspondingly, it can be seen from this simulation diagram that the antenna assembly 10 has effective radiation efficiency and effective system total efficiency in the first frequency band of the second target frequency band, which is also called having qualified radiation efficiency and efficiency bandwidth. It can be seen from this simulation diagram that the antenna assembly 10 has effective radiation efficiency and effective system total efficiency in the second frequency band of the second target frequency band, which is also called having qualified radiation efficiency and efficiency bandwidth.

[0161] In addition, the specific value of the radiation efficiency at point 1 is also shown in this simulation diagram. According to the methods of formulas (1) to (6) introduced later, the SAR gain of the antenna assembly provided by the embodiments of the present application supporting the first target frequency band can be calculated. Correspondingly, the SAR value of the antenna assembly provided in the related art supporting the first target frequency band is also calculated according to the methods of formulas (1) to (6) introduced later. Furthermore, when the antenna assembly provided by the embodiments of the present application supports the first target frequency band, the SAR gain compared with the antenna assembly provided in the related art supporting the first target frequency band can be calculated.

[0162] From Figure 13 the provided antenna assembly 10 and Figure 4 the provided antenna assembly 10 for comparison, Figure 13 the antenna assembly 10 in Figure 4 has added the first circuit M11 compared with the antenna assembly 10 in Figure 29 and Figure 31 . By comparing Figure 30 with Figure 32 , it can be seen that adding the first circuit M11 to the antenna assembly 10 has almost no effect on the radiation efficiency and system total efficiency of the first target frequency band, the first frequency band of the second target frequency band, and the second frequency band of the second target frequency band.

[0163] When the first target frequency band is the N78 frequency band of the UHB frequency band and the second target frequency band is the WiFi frequency band, adding a band-pass circuit for the N78 frequency band and a band-stop filter circuit for the WiFi frequency band to the antenna assembly 10 has almost no effect on the radiation efficiency and impedance matching of the N78 frequency band and the WiFi frequency band.

[0164] Please refer toFigure 33 , Figure 33 is Figure 1 the efficiency simulation diagram of the antenna assembly in the related art. In this schematic diagram, the abscissa is frequency, with the unit of GHz; the ordinate is efficiency, with the unit of dB. Among them, curve ① is the S1,1 curve of the antenna assembly 10 in the related art. Curve ② is the System Rad.Efficiency curve of the antenna assembly 10 in the related art; curve ③ is the System Tot.Efficiency curve of the antenna assembly 10. In this simulation diagram, the coordinates at point 1 are (3.5, -0.46082), which indicates that the frequency at point 1 is 3.5 GHz and the radiation efficiency is -0.46082 dB. The reason for showing the radiation efficiency at point 1 is to calculate the normalized SAR value of the antenna assembly 10 in the related art at 3.5 GHz, so as to compare it with the normalized SAR value of the antenna assembly 10 provided by the embodiment of the present application at the same resonant frequency point.

[0165] The calculation formula used for calculating the normalized SAR value will be described in detail below.

[0166] Assume that the power fed into the antenna at the feeding port is A, with the unit of dBm; the antenna efficiency (i.e., the system total efficiency) is C, with the unit of dB; then the total radiated power (TRP) of the antenna is d, with the unit of dBm, and there is formula (1) as follows:

[0167] d = A - C (1);

[0168] Assume that the antenna transmission power is normalized to f, with the unit of dBm, then the normalized radiated power is q, with the unit of dBm, and there is formula (2) as follows:

[0169] q = d - f (2);

[0170] The definition of SAR is shown in formula (3) as follows:

[0171]

[0172] Among them, in formula (3), σ represents the conductivity of the biological body (usually referring to the human body), ρ represents the density of the tissue of the biological body, and E(r) represents the vector of the electric field strength in space.

[0173] The relationship between the radiated power P and the electric field strength vector E is shown in formula (4) as follows:

[0174]

[0175] Among them, in formula (4), Ap The radiation aperture is denoted as p , and the impedance is denoted as η. For example, to calculate the radiation power of the antenna assembly 10 at a certain point, η represents the impedance of the space at that point. E represents the electric field strength vector.

[0176] SAR is directly proportional to the radiation power P.

[0177] Assume that the simulation result of SAR is S, with the unit of W / Kg. Then, the normalized SAR value s is shown in Equation (5) as follows:

[0178] s = S / Power(10, 0.1 * q) (5);

[0179] Assume that the benefit of reducing the SAR value of the low-SAR antenna relative to the reference antenna is G. Then, G can be calculated by Equation (6) as follows:

[0180]

[0181] Among them, the antenna assembly 10 provided in this embodiment is a low-SAR antenna, and the antenna assembly 10 in the related art (also known as the antenna assembly 10 of the reference solution) is the reference antenna. s1 is the normalized SAR value of the antenna assembly 10 of this technical solution; s2 is the normalized SAR value of the reference solution.

[0182] Please refer to Figure 34 , Figure 34 for Figure 17 the simulation diagram of the antenna assembly shown in. In this schematic diagram, the abscissa is the frequency with the unit of GHz; the ordinate is the efficiency with the unit of dB. Among them, Curve ① represents the S11 curve when the antenna assembly 10 supports the first target frequency band and the second target frequency band. Among them, the first target frequency band is N78 of the UH frequency band, and the second target frequency band is the WiFi frequency band. Curve ② represents the isolation degree curve (i.e., the S21 curve) when the first feeder S1 supports the WiFi frequency band and the N78 frequency band and the third target frequency band supported by the second feeder S2 is the B8 frequency band. Curve ③ represents the isolation degree curve when the first feeder S1 supports the WiFi frequency band and the N78 frequency band and the third target frequency band supported by the second feeder S2 is the B28 frequency band. Curve ④ represents the S22 curve when the antenna assembly 10 supports the third target frequency band as the B8 frequency band. Curve ⑤ represents the S22 curve when the antenna assembly 10 supports the third target frequency band as the B28 frequency band.

[0183] It should be noted that Curve ② is divided into three segments, and all three segments are labeled as ②. Correspondingly, Curve ③ is divided into two segments, and both segments are labeled as ③.

[0184] As can be seen from this simulation diagram, regardless of which sub-band of the third target frequency band the antenna assembly 10 operates in, it maintains good isolation from the feeding ports of the first target frequency band and the second target frequency band. When the third target frequency band is the LB band, the third target frequency band includes the B8 band and the B28 band. Whether the antenna assembly 10 operates in the B8 band or the B28 band, the feeding port of the second feed source S2 and the feeding port of the first feed source S1 maintain good isolation.

[0185] Please refer to Figure 35 , Figure 35 for Figure 17 the efficiency simulation diagram of the first target frequency band and the second target frequency band when the antenna assembly in

[0186] Please refer to Figure 36 , Figure 36 for Figure 17 the efficiency simulation diagram of the antenna assembly in

[0187] In summary, the radiator 120 of the antenna assembly 10 provided by an embodiment of the present application can support the first target frequency band and the second target frequency band. Therefore, for the antenna assembly 10 provided by an embodiment of the present application, the radiation branches of the first target frequency band (such as the UHB frequency band) and the second target frequency band (such as the WiFi frequency band) are combined into one body. Compared with using one radiation branch to support one target frequency band respectively, the size of the radiator 120 of the antenna assembly 10 provided by the embodiment of the present application is smaller. For example, it can save about 7 mm of space compared with using one radiation branch to support one target frequency band in the related art. When the radiator 120 of the antenna assembly 10 is disposed at the vertex angle of the electronic device 1, the antenna assembly 10 is an upper antenna. The antenna assembly 10 provided by the embodiment of the present application can improve the utilization rate of the good antenna space position at the corner position of the electronic device 1 to which the antenna assembly 10 is applied.

[0188] In addition, the radiator 120 includes a first radiation portion 121 and a second radiation portion 122 that are bent and connected, and the first target frequency band is supported by using the balanced mode of the radiator 120, so that a lower SAR value is achieved when the antenna assembly 10 supports the first target frequency band.

[0189] Specifically, please refer to Figure 37 and Figure 38 , Figure 37 which is a schematic diagram of the SAR value of the antenna assembly provided by the related art; Figure 38 which is a schematic diagram of the SAR value of the antenna assembly provided by an embodiment of the present application. For the convenience of comparison, taking the first target frequency band of the antenna assembly provided by the related art and the antenna assembly provided by the embodiment of the present application as the UHB frequency band as an example for illustration. Among them, during simulation, the N78 frequency band (3.5 GHz) is used for simulation. As Figure 37 can be seen, the SAR hot spot peak value of the antenna assembly in the related art when working in the first target frequency band is 4.90666 W / Kg. As Figure 38 can be seen, the SAR hot spot peak value (the peak value of the second SAR hot spot here) of the antenna assembly provided by the embodiment of the present application when working in the first target frequency band is 2.92963 W / Kg. It should be noted that, as introduced above, when the antenna assembly provided by the embodiment of the present application supports the first target frequency band, there are two SAR hot spots. These two SAR hot spots are respectively named the first SAR hot spot and the second SAR hot spot. Among them, the first SAR hot spot is distributed on the first radiation portion 121, and the second SAR hot spot is distributed on the second radiation portion 122. Since the peak values of the first SAR hot spot and the second SAR hot spot are the same or basically the same, therefore, in Figure 38Only one SAR hot spot is schematically shown, and the number of SAR hot spots in the illustration should not be construed as a limitation on the number of SAR hot spots when the antenna assembly provided by the embodiment of the present application supports the first target frequency band.

[0190] In addition, in order to facilitate the calculation of the SAR value gain reduced by the antenna assembly provided by the embodiment of the present application compared to the antenna assembly provided in the related art in the first target frequency band, in Figure 32 the radiation efficiency and impedance matching curves of the antenna assembly provided in the related art are schematically shown. According to the methods of formulas (1) to (6) introduced above, when the antenna assembly provided by the embodiment of the present application supports the first target frequency band, the SAR gain compared to the antenna assembly provided in the related art supporting the first target frequency band can be calculated. Compared with the antenna assembly provided in the related art, the SAR gain of the antenna assembly provided by the embodiment of the present application when supporting the first target frequency band is reduced by about 1.73 dB.

[0191] In addition, in the antenna assembly 10 provided by an embodiment, the antenna assembly 10 further includes a second feed source S2 in addition to the first feed source S1. The second feed source S2 can excite the radiator 120 to support the third target frequency band. Therefore, the antenna assembly 10 can support not only the first target frequency band and the second target frequency band, but also the third target frequency band, so that the antenna assembly 10 supports more frequency bands and meets the communication requirements of multiple frequency bands.

[0192] In addition, the orthographic projection of the feeding point P1 on the middle frame 110 is located within the current weak point area 110a, so that the size of the radiator 120 can be further reduced. For example, when the first target frequency band is the UHB frequency band, the second target frequency band is the WiFi frequency band, and the third target frequency band is the LB frequency band, about 50 mm of upper antenna space can be saved. It can be seen that for the antenna assembly 10 provided by the embodiment of the present application, the orthographic projection of the feed point on the middle frame 110 is located within the current weak point area 110a, and the space utilization rate of the antenna assembly 10 can be increased greatly, even maximally.

[0193] As described above, compared with each using a radiation stub to support a target frequency band, the size of the radiator 120 of the antenna assembly 10 provided by the embodiment of the present application is smaller. For example, about 7 mm of space can be saved compared with each using a radiation stub to support a target frequency band in the related art. In addition, the orthographic projection of the feeding point P1 on the middle frame 110 is located within the current weak point area 110a. When the third target frequency band is the LB frequency band, about 50 mm of upper antenna space can be saved. Therefore, the total space that can be saved is about 57 mm.

[0194] In addition, as can be seen from the previous simulation diagrams, when the antenna assembly 10 operates in the LB band, the antenna assembly 10 can operate in the B8 band and the B28 band of the LB band respectively. Whether the antenna assembly 10 operates in the B8 band of the LB band or in the B28 band of the LB band, the feeding ports of the second feeder S2 and the first feeder S1 maintain good isolation.

[0195] In addition, as can be seen from the previous simulation diagrams, for the antenna assembly 10 provided by the embodiment of the present application, the antenna assembly 10 supports the first target band, the second target band and the third target band. Therefore, it is equivalent to the co - integration of the first target band antenna, the second target band antenna and the third target band antenna. When the first target band is the N78 band of the UHB band, the second target band is the WiFi band, and the third target band is the LB band, it is equivalent to the co - integration design of the UHB antenna, the WiFi antenna and the LB antenna. The WiFi antenna and the UHB band in the co - integration design of the three antennas have effective radiation.

[0196] Due to the switching of the switching switch SW of the antenna assembly 10, the radiation efficiency of the LB antenna in the co - integration design of the three antennas is as Figure 36 shown. It can be seen that the radiation efficiency and the efficiency bandwidth of the LB antenna can also meet the requirements of the LB antenna.

[0197] In addition, for the antenna assembly 10 provided by the embodiment of the present application, when the antenna assembly 10 also supports the LB band, the change in the structure of the antenna assembly 10 is basically small, and only a second feeder S2 needs to be added. As Figure 34 can be seen, the feeding ports of the second feeder S2 and the first feeder S1 maintain good isolation. For example, the feeding port of the LB band maintains good isolation from the feeding ports of the UHB band and the WiFi band. Thus, it can be seen that by adding the second feeder S2 to the antenna assembly 10 having the first feeder S1 in the embodiment of the present application, the influence on the first target band and the second target band supported by the original first feeder S1 is small. In addition, the SAR value when the antenna assembly 10 supports the first target band, the second target band and the third target band is basically the same as the SAR value when the antenna assembly 10 provided by the embodiment of the present application supports the first target band and the second target band, that is, the SAR value gain is basically unchanged.

[0198] Please refer to Figure 39 and Figure 40 , Figure 39 which is a schematic diagram of an electronic device provided by an embodiment of the present application; Figure 40 is Figure 39Partial structural schematic diagram of the electronic device shown in the figure. An embodiment of the present application also provides an electronic device 1. The electronic device 1 includes, but is not limited to, devices capable of receiving and transmitting electromagnetic wave signals such as mobile phones, telephones, televisions, tablet computers (Pads), cameras, personal computers, laptop computers (Personal Computers, PCs), vehicle-mounted devices, headphones, watches, wearable devices, base stations, vehicle-mounted radars, customer premise equipment (CPE), etc. In the present application, the electronic device 1 is taken as a mobile phone as an example, and other devices can refer to the specific description in the present application. The electronic device 1 may include the antenna assembly 10 as described in any of the previous embodiments. Please refer to the previous description for the antenna assembly 10, and details will not be repeated here.

[0199] Further, the middle frame 110 includes an adjacent main board setting area 110c and a battery setting area 110d, and the electronic device 1 further includes a main board 20 and a battery 40. The main board 20 is disposed in the main board setting area 110c, and the main board 20 has the first feed source S1. The battery 40 is disposed in the battery setting area 110d. The radiator 120 is disposed corresponding to the main board setting area 110c, and the second radiation portion 122 of the radiator 120 is disposed on a side of the main board 20 away from the battery 40. The feeding point P1 is electrically connected to the main board 20 through an electrical connector to be electrically connected to the first feed source S1. The electrical connector may be, but is not limited to, an elastic conductive sheet, a conductive screw, or a conductive transmission line (such as a cable (Cable line), etc.).

[0200] The main board setting area 110c and the battery setting area 110d may be spaced apart or connected. In the present embodiment, the main board setting area 110c and the battery setting area 110d are spaced apart as an example for illustration. In the illustrated perspective, the main board setting area 110c is located in the upper part of the middle frame 110, and the battery setting area 110d is located in the lower part of the middle frame 110. It can be understood that as the placement posture of the middle frame 110 changes, the relative positional relationship between the main board setting area 110c and the battery setting area 110d in the middle frame 110 will also change.

[0201] The main board setting area 110c and the battery setting area 110d are arranged along the first direction D1. In an embodiment, the main board setting area 110c is in the extending direction of the first side 1111 of the middle frame 110. The main board 20 includes a first reference edge 210 and a second reference edge 220 that are spaced apart along the first direction D1. Among them, the first reference edge 210 is farther from the battery 40 than the second reference edge 220. In addition, the main board 20 further includes a third reference edge 230 and a fourth reference edge 240 that are spaced apart along the second direction D2. Among them, the second direction D2 intersects the first direction D1. In an embodiment, the second direction D2 is in the extending direction of the second side 1112 of the middle frame 110. The third reference edge 230 is bent and connected to the first reference edge 210 and the second reference edge 220 respectively, and the first reference edge 210 and the second reference edge 220 are both arranged on the same side of the third reference edge 230. The fourth reference edge 240 is bent and connected to the first reference edge 210 and the second reference edge 220 respectively, and the first reference edge 210 and the second reference edge 220 are both arranged on the same side of the fourth reference edge 240.

[0202] The radiator 120 is arranged corresponding to the main board setting area 110c. Specifically, the second radiation part 122 of the radiator 120 is arranged on the side of the main board 20 facing away from the battery 40. That is, the second radiation part 122 of the radiator 120 is arranged on the side of the main board setting area 110c facing away from the battery setting area 110d. From the specific structure of the main board 20 described above, the second radiation part 122 of the radiator 120 is arranged on the side of the first reference edge 210 facing away from the second reference edge 220; the first radiation part 121 of the radiator 120 is arranged on the side of the third reference edge 230 facing away from the fourth reference edge 240.

[0203] As can be seen from the above description, the distance between the radiator 120 and the main board 20 is relatively close. Therefore, when the feeding point P1 of the radiator 120 is electrically connected to the main board 20 through an electrical connector to be electrically connected to the first feed source S1, the size of the electrical connector is short, thereby reducing or even avoiding excessive loss of the first excitation signal during transmission on the electrical connector due to the overlong size of the electrical connector.

[0204] If the radiator 120 is arranged corresponding to the battery setting area 110d, for example, at least a part of the radiator 120 is arranged on the side of the battery setting area 110d away from the main board setting area 110c (which can also be regarded as at least a part of the radiator 120 is arranged on the side of the battery 40 away from the main board 20), then the radiator 120 is relatively far from the main board 20. Therefore, the feeding point P1 of the radiator 120 needs to be electrically connected to the main board 20 through an electrically connecting member with a relatively long dimension (such as a transmission cable, also called a Cable line). Then, when the first excitation signal generated by the first feed source S1 of the main board 20 is transmitted on the electrically connecting member with a relatively long dimension, it will cause a relatively large loss of the electrically connecting member.

[0205] However, for the antenna assembly 10 provided by the embodiment of the present application, the radiator 120 is arranged corresponding to the main board setting area 110c, and the second radiation part 122 of the radiator 120 is arranged on the side of the main board 20 away from the battery 40. Therefore, when the feeding point P1 is electrically connected to the main board 20 through the electrically connecting member to be electrically connected to the first feed source S1, the dimension of the electrically connecting member is relatively short, thereby reducing or even avoiding the excessive loss of the first excitation signal when it is transmitted on the electrically connecting member due to the too long dimension of the electrically connecting member.

[0206] It can be understood that in the schematic diagram of this embodiment, the radiator 120 is taken as an example and shown as being arranged at the top corner on the left side of the electronic device 1; in other embodiments, the radiator 120 can also be arranged at the top corner on the right side of the electronic device 1.

[0207] Furthermore, the electronic device 1 has a top 1a and a bottom 1b which are arranged opposite to each other, and the radiator 120 is arranged on the top 1a of the electronic device 1.

[0208] The so-called top 1a of the electronic device 1 generally refers to the part located on the upper side when the electronic device 1 is in use. Generally speaking, the top 1a of the electronic device 1 accounts for one-third or less than one-third of the whole electronic device 1. Correspondingly, the so-called bottom 1b of the electronic device 1 generally refers to the part located on the lower side when the electronic device 1 is in use. Generally speaking, the bottom 1b of the electronic device 1 accounts for one-third or less than one-third of the whole electronic device 1.

[0209] Please refer to Figure 40 , in one embodiment, the middle frame 110 includes a frame body 310 and a frame edge 320. The frame edge 320 surrounds the periphery of the frame body 310. The radiator 120 is formed on the frame edge 320.

[0210] The middle frame 110 is generally electrically conductive, such as made of metal (such as aluminum or aluminum-magnesium alloy). In the electronic device 1, the frame body 310 of the middle frame 110 is generally used to carry the display screen 70 and the housing 90. Since the frame body 310 of the middle frame 110 is electrically conductive, the frame body 310 of the middle frame 110 can also be used as a floor. The components in the electronic device 1 can be directly or indirectly electrically connected to the frame body 310 of the middle frame 110 to be grounded.

[0211] Specifically, in this embodiment, the frame 320 has an outer surface 320a facing away from the frame body 310. There is a first gap 320b between the part of the frame 320 at the top corner and the frame body 310. The frame 320 has a second gap 320c and a third gap 320d located on the outer surface 320a and communicating with the first gap 320b, wherein the second gap 320c and the third gap 320d are arranged at intervals. The first gap 320b, the second gap 320c and the third gap 320d together define the radiator 120.

[0212] In other embodiments, the electronic device 1 further includes a display screen 70, a middle frame 110 and a housing 90 (also called a battery cover). The display screen 70 and the housing 90 are respectively arranged on two opposite sides of the middle frame 110.

[0213] In addition, in one embodiment, the middle frame 110 and at least one of the housing 90 and the display screen 70 also form a receiving space. The electronic device 1 further includes a battery 40 and functional components (the functional components may include one or more of a camera module, a microphone, a receiver, a speaker, a face recognition module, a fingerprint recognition module, etc.) arranged in the receiving space and capable of realizing the basic functions of a mobile phone, which will not be elaborated in this embodiment. It can be understood that the above introduction of the electronic device 1 is only an illustration of an environment in which the antenna assembly 10 is applied, and the specific structure of the electronic device 1 should not be construed as a limitation to the antenna assembly 10 provided in this application. In other embodiments, the electronic device 1 may also not include at least one of the display screen 70 and the housing 90.

[0214] The above are some embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present application.

Claims

1. An electronic device, characterized in that, The electronic device includes an antenna assembly, and the antenna assembly includes: A middle frame, the middle frame includes a first side and a second side that are bent and connected, wherein the length of the first side is greater than the length of the second side; A radiator, the radiator includes a first radiation portion and a second radiation portion that are bent and connected, and has a feeding point, the first radiation portion has a first open end, and the first radiation portion is disposed corresponding to the first side, the second radiation portion has a second open end, and the second radiation portion is disposed corresponding to the second side; and A first feed source, the first feed source is electrically connected to the feeding point, the first feed source is used to generate a first excitation signal to excite the radiator to generate a first resonance mode supporting a first target frequency band, wherein the first resonance mode is a half-wavelength mode from the first open end to the second open end.

2. The electronic device according to claim 1, wherein The first feed source is further used to excite the radiator to support a second target frequency band, wherein the second target frequency band includes a first frequency band and a second frequency band.

3. The electronic device according to claim 2, characterized in that, The feeding point is located on the first radiating portion, and the stub length from the feeding point to the first open end is d 11 , and the stub length from the feeding point to the second open end is d 12 , d 11 < d 12 ; the first feed source is further configured to generate a second excitation signal, and the second excitation signal is used to excite the radiator to generate a second resonance mode that supports the first frequency band, wherein the second resonance mode is a quarter-wavelength mode from the feeding point to the second open end.

4. The electronic device according to claim 3, characterized in that, The first feed source is further used to generate a third excitation signal, and the third excitation signal is further used to excite the radiator to generate a third resonance mode supporting the second frequency band, wherein the third resonance mode is a quarter-wavelength mode from the feeding point to the first open end.

5. The electronic device according to claim 4, wherein The length L of the second radiation part 11 satisfies: where λ1 is the wavelength corresponding to the center frequency point of the first target frequency band; The length L from the feeding point to the connection of the first radiation part and the second radiation part 12 satisfies: where λ2 is the wavelength corresponding to the center frequency point of the first frequency band in the second target frequency band; The length d from the feeding point to the first open end 11 satisfies: where λ3 is the wavelength corresponding to the center frequency of the second frequency band in the second target frequency band.

6. The electronic device according to claim 3, wherein The feeding point is located on the second radiation part, and the stub length from the feeding point to the first open end is d 21 , and the stub length from the feeding point to the second open end is d 22 , d 21 > d 22 , wherein the second excitation signal is used to excite the radiator to generate a second resonance mode that supports the first frequency band, and the second resonance mode is a quarter-wavelength mode from the feeding point to the first open end.

7. The electronic device according to claim 6, wherein The first feed source is further used to generate a third excitation signal, and the third excitation signal is used to excite the radiator to generate a third resonance mode supporting the second frequency band, wherein the third resonance mode is a quarter-wavelength mode from the feeding point to the second open end.

8. The electronic device according to claim 7, wherein The length L of the first radiation part 21 satisfies: where λ1 is the wavelength corresponding to the center frequency point of the first target frequency band; The length L from the feeding point to the connection of the first radiating part and the second radiating part 12 satisfies: where λ 21 is the wavelength corresponding to the center frequency point of the first frequency band in the second target frequency band; The length d from the feeding point to the second open end 22 satisfies: where λ 22 is the wavelength corresponding to the center frequency of the second frequency band in the second target frequency band.

9. The electronic device according to claim 2, wherein The radiator further has a connection point, the connection point is spaced from the feeding point, and the antenna assembly further includes: A first circuit, one end of the first circuit is electrically connected to the connection point, and the other end is grounded. The first circuit is a band-pass circuit for the first target frequency band, and the first circuit is a band-stop filter circuit for the second target frequency band.

10. The electronic device according to claim 9, characterized in that, The radiator further has a midpoint, and the distance d3 from the connection point to the midpoint satisfies: where λ1 is the wavelength corresponding to the center frequency point of the first target frequency band.

11. The electronic device according to any one of claims 1-10, characterized in that, The antenna assembly further includes: A second circuit, one end of the second circuit is electrically connected to the first feed source, and the other end of the second circuit is electrically connected to the feeding point. The second circuit is used to tune the first target frequency band.

12. The electronic device according to any one of claims 2-8, characterized in that, The antenna assembly further includes: A first matching circuit, the first feed source is electrically connected to the first matching circuit to the feeding point; and A second feed source, the second feed source is used to generate a fourth excitation signal; The second feed source is electrically connected to the feeding point to excite the radiator to support a third target frequency band, wherein the first matching circuit is a band-pass filter circuit for the first target frequency band and the second target frequency band, and the first matching circuit is a band-stop filter circuit for the third target frequency band.

13. The electronic device according to claim 12, wherein The antenna assembly further includes: A switching switch, the switching switch is used to make the antenna assembly work in different sub-frequency bands when supporting the third target frequency band according to preset configuration parameters; and A second matching circuit, the second matching circuit is connected in series with the switching switch to form a series unit; The second matching circuit is a band-stop filter circuit for the first target frequency band and the second target frequency band, and the second matching circuit is a band-pass filter circuit for the third target frequency band.

14. The electronic device according to claim 12, characterized in that, The radiator is spaced apart from the middle frame, the middle frame further has a current weak point region of a characteristic mode current, and the orthographic projection of the feeding point on the middle frame is located in the current weak point region.

15. The electronic device according to claim 14, characterized in that, The antenna assembly further comprises: an inductive device, one end of which is electrically connected to the first feed source, and the other end of which is electrically connected to the feeding point; The electrical length of the radiator satisfies: where λ3 is the wavelength corresponding to the center frequency point of the third target frequency band.

16. The electronic device according to claim 14, wherein The current weak point area is located in a square area with the intersection of the extension line of the first side and the extension line of the second side as the vertex and the side length of 1 / 16 of the wavelength of the third target frequency band as the side length; Alternatively, the current weak point area is located in an area with an intersection of an extension line of the first side and an extension line of the second side as the center and a radius of 1 / 16 of the wavelength of the third target frequency band.

17. The electronic device according to claim 2, characterized in that, The first target frequency band is a UHB frequency band, the second target frequency band is a WiFi frequency band, the first frequency band of the second target frequency band is a WiFi 2.4G frequency band, and the second frequency band of the second target frequency band is a WiFi 5G frequency band.

18. The electronic device according to claim 1, wherein The middle frame includes an adjacent mainboard arrangement area and a battery arrangement area, and the electronic device further includes: A main board, the main board is arranged in the main board arrangement area, and the main board has the first feed source; and A battery, wherein the battery is arranged in the battery arrangement area; The radiator is arranged corresponding to the mainboard setting area, the second radiating portion of the radiator is arranged on a side of the mainboard away from the battery, and the feeding point is electrically connected to the mainboard through an electrical connector to be electrically connected to the first feed source.

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