Electronic device

Abstract

The invention provides an electronic device. The electronic equipment comprises a floor and an antenna assembly. The floor comprises a first edge and a second edge which are connected in a bent mode, the first edge is longer than the second edge, and the floor is provided with a current weakness area of characteristic mode current. The antenna assembly comprises a main radiator, at least one parasitic radiator and a feed source. The main radiator is provided with a first open-circuit end, a second open-circuit end and a feeding point, the main radiator and the floor are arranged at intervals, and orthographic projection of the feeding point on the floor is located in a current weak-point area. The at least one parasitic radiator and the main radiator are arranged at an interval and are coupled. The feed source electrically generates an excitation signal, is electrically connected to the feed point and excites the floor through the main radiator to generate a resonance current along the extension direction of the first edge, and the excitation signal excites the main radiator to support a first frequency band of a target frequency band; the at least one parasitic radiator is coupled with the main radiator so as to be excited by the excitation signal to generate a second frequency band supporting the target frequency band, and the resonance frequency point of the second frequency band is different from the resonance frequency point of the first frequency band.

Description

Technical Field

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

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

[0003] In a first aspect, the present application provides an electronic device, the electronic device comprising:

[0004] A floor, the floor comprising a first side and a second side connected by a bend, wherein the length of the first side is greater than the length of the second side, and the floor has a current weak point area of ​​a characteristic mode current; and

[0005] An antenna assembly, the antenna assembly comprising:

[0006] A main radiator, the main radiator having a first open end, a second open end and a feeding point, the main radiator being spaced apart from the floor, and the orthographic projection of the feeding point on the floor being located in the current weak point area;

[0007] at least one parasitic radiator, the at least one parasitic radiator being spaced apart from and coupled to the main radiator; and

[0008] A feed source, wherein the feed source electrically generates an excitation signal, the feed source is electrically connected to the feed point to excite the floor through the main radiator to generate a resonant current along the extension direction of the first side, the excitation signal also excites the main radiator to support a first frequency band of a target frequency band, and the at least one parasitic radiator is coupled to the main radiator to be excited by the excitation signal to generate a second frequency band supporting the target frequency band, wherein the resonant frequency point of the second frequency band is different from the resonant frequency point of the first frequency band.

[0009] In summary, in the antenna assembly in the electronic device provided by the embodiment of the present application, the main radiator is spaced apart from the floor, and the orthographic projection of the feeding point on the floor is located in the current weak point area of ​​the characteristic mode current of the floor, which can better excite the excitation current along the extension direction of the first side, so that the antenna assembly has a higher radiation efficiency in the target frequency band. It can be seen that the communication performance of the antenna assembly provided by the embodiment of the present application is better. In addition, in the antenna assembly provided by the embodiment of the present application, the floor constitutes the main radiation branch of the target frequency band, contributing most of the radiation of the antenna assembly, and the main radiator is equivalent to acting as the radiation driving device of the entire antenna assembly, which becomes the excitation condition for the floor to work in the target frequency band, and the energy of the main radiator accounts for a very small proportion. Therefore, in this case, reducing the size of the main radiator has little effect on the overall radiation performance of the antenna assembly. In addition, in this embodiment, the main radiator receives the excitation signal through the feeding point, and supports the first frequency band of the target frequency band under the excitation of the excitation signal; the at least one parasitic radiator is coupled to the main radiator to be excited by the excitation signal to generate a second frequency band supporting the target frequency band. Therefore, when the antenna component supports the target frequency band, it can operate in the first frequency band and the second frequency band of the target frequency band. Therefore, the antenna component can support more communication frequency bands and has a larger bandwidth in the target frequency band, so it has better communication performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 A schematic diagram of a partial structure of an electronic device provided in one embodiment of the present application;

[0012] Figure 2 for Figure 1 An equivalent schematic diagram of a partial structure of an electronic device shown;

[0013] Figure 3 for Figure 1 A side view of a portion of the structure of the electronic device shown in;

[0014] Figure 4 A schematic diagram of current distribution of a dipole antenna and an antenna assembly provided in an embodiment of the present application;

[0015] Figure 5 A schematic diagram of the distribution of the characteristic current with the largest proportion of longitudinal current corresponding to the characteristic mode of the circuit board;

[0016] Figure 6 for Figure 5 A schematic diagram of a current weak point area and a current strong point area in a floor of a circuit board shown;

[0017] Figure 7 for Figure 1 A schematic diagram of the current weak point area in the antenna assembly provided in;

[0018] Figure 8 A schematic diagram of the flow direction of a first current of a main radiator and a second current of a first parasitic radiator in an antenna assembly provided in one embodiment of the present application;

[0019] Fig. 9 A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0020] Fig.10 A schematic diagram of an antenna assembly in which a radiator is replaced by an inductive device;

[0021] Fig.11 for Fig. 9 A schematic diagram of the electrical length of the main radiator and the electrical length of the first parasitic radiator in the antenna assembly provided in;

[0022] Fig.12 A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0023] Fig.13 A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0024] Fig.14 for Fig.12 A schematic diagram of the electrical length of the main radiator and the electrical length of the first parasitic radiator in the antenna assembly provided in;

[0025] Fig.15 A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0026] Fig.16 for Fig.15 An equivalent schematic diagram of a partial structure of an electronic device shown;

[0027] Fig.17 A schematic diagram of an antenna assembly provided in yet another embodiment of the present application;

[0028] Fig.18 for Fig.17 A schematic diagram of the electrical length of the second parasitic radiator in the antenna assembly provided in;

[0029] Fig.19 for Fig. 9 S-parameter simulation diagram of the antenna assembly shown in;

[0030] Fig. 20 for Fig. 9 The system radiation efficiency simulation diagram of the S parameters of the antenna assembly shown in FIG.

[0031] Fig.21 for Fig.12 S-parameter simulation diagram of the antenna assembly shown in;

[0032] Fig. 22 for Fig.12 The system radiation efficiency simulation diagram of the S parameters of the antenna assembly shown in FIG.

[0033] Fig.23 for Fig.17 S-parameter simulation diagram of the antenna assembly shown in;

[0034] Fig.24 for Fig.17 The system radiation efficiency and system total efficiency simulation diagram of the S parameters of the antenna assembly shown in FIG.

[0035] Fig.25 is a schematic diagram of an antenna assembly without a parasitic radiator in the related art;

[0036] Fig.26 for Fig.25 A schematic diagram of the electrical length of the main radiator in the antenna assembly shown in FIG.

[0037] Fig. 27 for Fig.25 The antenna assembly in the related art shown in FIG. Figure 2 SAR heat map of the antenna assembly shown;

[0038] Fig.28 for Fig.25 The antenna assembly in the related art shown in FIG. Figure 2 A schematic diagram of current distribution of the antenna assembly shown;

[0039] Fig.29 A three-dimensional schematic diagram of an electronic device provided in one embodiment.

[0040] Description of main component numbers:

[0041] Electronic device 1, circuit board 10, floor 111, first side 1111, second side 1112, current weak point area 110a, current strong point area 110b; antenna assembly 30, main radiator 310, first open end 311, second open end 312, feeding point P; feed source S, first parasitic radiator 320, first ground end 321, first free end 322, first coupling gap 320a; second parasitic radiator 330, second ground end 331, second free end 332, second coupling gap 330a; first matching circuit M1, second matching circuit M2, third matching circuit M3, antenna switch SW; electrical connector 340, middle frame 50, frame body 510, frame 520, display screen 70, shell 90; first current I1, second current I2, first direction D1, second direction D2. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. In addition, the reference to "embodiment" or "implementation method" in this article means that the specific features, structures or characteristics described in conjunction with the embodiments or implementation methods may be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] See also Figure 1 , Figure 2 , Figure 3 and Fig.29 , Figure 1 A schematic diagram of a partial structure of an electronic device provided in one embodiment of the present application; Figure 2 for Figure 1 An equivalent schematic diagram of a partial structure of an electronic device shown; Figure 3 for Figure 1 A side view of a portion of the structure of the electronic device shown in; Fig.29A three-dimensional schematic diagram of an electronic device provided in an embodiment. The embodiment of the present application provides an electronic device 1, the electronic device 1 comprising a floor 111 and an antenna assembly 30. The floor 111 comprises a first side 1111 and a second side 1112 connected by a bend, wherein the length of the first side 1111 is greater than the length of the second side 1112, and the floor 111 has a current weak point area 110a of a characteristic mode current. The antenna assembly 30 comprises a main radiator 310, at least one parasitic radiator (the first parasitic radiator 320 in this schematic diagram) and a feed source S. The main radiator 310 has a first open end 311, a second open end 312 and a feeding point P, the main radiator 310 is spaced apart from the floor 111, and the orthographic projection of the feeding point P on the floor 111 is located in the current weak point area 110a. The feed source S electrically generates an excitation signal, and the feed source S is electrically connected to the feed point P to excite the floor 111 through the main radiator 310 to generate a resonant current along the extension direction of the first side 1111, and the excitation signal also excites the main radiator 310 to support a first frequency band of the target frequency band, and the at least one parasitic radiator is coupled to the main radiator 310 to be excited by the excitation signal to generate a second frequency band supporting the target frequency band, wherein the resonant frequency point of the second frequency band is different from the resonant frequency point of the first frequency band.

[0044] The floor 111 may be, but is not limited to, the ground of the motherboard in the electronic device 1, or the frame body 510 of the middle frame 50, or a shielding member of the display screen 70, etc. In this embodiment, the floor 111 is taken as the ground of the motherboard in the electronic device 1 as an example for illustration, which is understandable and should not be construed as a limitation on the embodiments of the present application.

[0045] The floor 111 in the circuit board 10 may be, but is not limited to, a metal layer (e.g., a copper layer). A large piece of metal layer in the circuit board 10 usually constitutes the floor 111, also referred to as a ground electrode. It is understandable that the circuit board 10 also includes multiple insulating layers and multiple wiring layers. The floor 111 is usually sandwiched between two adjacent insulating layers. The wiring layer is also arranged between adjacent insulating layers, and the wiring layer and the floor 111 are arranged with an insulating layer between them. Different wiring layers may be electrically connected through wires or metal through holes. It is understandable that the introduction of the circuit board 10 here is only one case of the circuit board 10, and should not be understood as a limitation on the circuit board 10 provided in the embodiment of the present application.

[0046] The first side 1111 is connected to the second side 1112 by bending, and the connection between the first side 1111 and the second side 1112 can be an arc shape or a right angle. The present application does not limit the shape of the connection between the first side 1111 and the second side 1112.

[0047] In this embodiment, the length of the first side 1111 is greater than the length of the second side 1112 , and therefore, the first side 1111 is also referred to as a long side, and the second side 1112 is also referred to as a short side.

[0048] In one embodiment, the floor 111 and the main radiator 310 together form a dipole antenna, the floor 111 is a radiating arm of the dipole antenna, named as the first radiating arm, and the main radiator 310 is another radiating arm of the dipole antenna, named as the second radiating arm. When the antenna assembly 30 is working, both the floor 111 and the main radiator 310 participate in the work.

[0049] The main radiator 310 may also be called a main branch. The main radiator 310 may be a laser direct structuring (LDS) radiator, or a flexible printed circuit (FPC) radiator, or a print direct structuring (PDS) radiator, or a metal branch radiator. When the antenna assembly 30 is applied to an electronic device 1, the main radiator 310 may be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the main radiator 310 may be an antenna radiator designed using the middle frame 50 formed of plastic and metal of the electronic device 1. In addition, the main radiator 310 may also be a metal frame 520 antenna radiator designed using a metal middle frame 50.

[0050] It is understandable that the present application does not specifically limit the shape, structure and material of the main radiator 310, and the shapes of the main radiator 310 include but are not limited to bent, straight, L-shaped, sheet-shaped, rod-shaped, coated, thin film, etc. When the main radiator 310 is in a strip shape, the present application does not limit the extension track of the main radiator 310, so the main radiator 310 can be extended in a straight line, a curve, a multi-stage bend, etc. The above-mentioned main radiator 310 can be a line with uniform width on the extension track, or it can be an irregular shape with different widths such as a gradual width and a widened area.

[0051] The main radiator 310 has two ends, both of which are not grounded. In other words, the main radiator 310 is open-circuited at both ends, so the two ends are named as the first open-circuit end 311 and the second open-circuit end 312. The feeding point P is located at the first open-circuit end 311, or at the second open-circuit end 312, or between the first open-circuit end 311 and the second open-circuit end 312. When the feeding point P is located at the first open-circuit end 311 and the second open-circuit end 312, the feeding point P can be located at any position of the first open-circuit end 311 and the second open-circuit end 312. The antenna assembly 30 also includes an electrical connector 340 (see Figure 1 ), the feed source S is electrically connected to the feed point P through the electrical connector 340. The electrical connector 340 may be, but is not limited to, an elastic conductive sheet, or a conductive screw, etc.

[0052] The feed source S is electrically connected to the feed point P through the electrical connector 340 , so that the electrical connection between the feed source S and the feed point P can be realized, which is simple and easy.

[0053] In this embodiment, the at least one parasitic radiator includes a first parasitic radiator 320. The first parasitic radiator 320 is arranged and coupled with the main radiator 310 with a first coupling gap 320a therebetween, and the first parasitic radiator 320 has a first grounding terminal 321, and the first grounding terminal 321 is grounded. The first parasitic radiator 320 is coupled with the main radiator 310 through the first coupling gap 320a to be excited by the excitation signal to generate a second frequency band supporting the target frequency band, wherein the resonant frequency point of the second frequency band is different from the resonant frequency point of the first frequency band.

[0054] Please also read Figure 4 , Figure 4 A schematic diagram of current distribution of a dipole antenna and an antenna assembly provided in an embodiment of the present application. Figure 4 (a) is a schematic diagram of current distribution of a dipole antenna; Figure 4 (b) is a schematic diagram of current distribution after one of the radiating arms in the dipole antenna is widened; Figure 4 (c) is a schematic diagram of current distribution after a radiating arm in a dipole antenna is widened; Figure 4 (d) is a schematic diagram of the current distribution of the antenna assembly 30 provided in the embodiment of the present application. Figure 4It can be seen that from (a) to (d), one radiating arm of the dipole antenna gradually widens. It can be seen that the floor 111 in the antenna assembly 30 of the present application can be equivalent to one radiating arm of the dipole antenna. Specifically, the floor 111 in the antenna assembly 30 can be regarded as an antenna vibrator with a certain width in the dipole antenna. In this way, the floor 111 of the circuit board 10 and the main radiator 310 are like a dipole antenna with a biased feeding point P.

[0055] When the antenna assembly 30 is applied to an electronic device 1 such as a mobile phone, the longitudinal dimension (length) and the transverse dimension (width) of the electronic device 1 are about 155mm×75mm. For the low-frequency band, the longitudinal dimension of the electronic device 1 is equivalent to 1 / 4 of the wavelength of the low-frequency band. According to the basic principle of the dipole antenna, that is, the longitudinal current of the floor 111 is fully stimulated, the equivalent aperture of the dipole antenna can be increased and the efficiency can be improved. At the same time, the floor 111 in the antenna assembly 30 provided in the embodiment of the present application is an effective radiator (i.e., the first radiating arm). The lower the frequency of the target frequency band supported by the antenna assembly 30, the more significant the current effect of the floor 111, that is, for the antenna assembly 30 whose target frequency band is a low-frequency band, the longitudinal current of the floor 111 can be fully stimulated, which can effectively improve the radiation efficiency of the antenna assembly 30.

[0056] In summary, in the implementation manner of the present application, the floor 111 can be regarded as a radiating arm (antenna vibrator) with a certain width, so that the floor 111 and the main radiator 310 are equivalent to a dipole antenna with a biased feed point P. The lower the target frequency band supported by the dipole antenna, the more significant the current effect of the floor 111, that is, for the antenna assembly 30 whose target frequency band is a low-frequency band, the excitation current (also called longitudinal current) of the floor 111 along the extension direction of the first side 1111 can be fully stimulated, which can effectively improve the radiation efficiency of the antenna assembly 30. It can be understood that although the target frequency band is a low-frequency band as an example for explanation here, in other implementation manners, the target frequency band can also be an intermediate frequency, or a high frequency, or a wireless fidelity (WiFi) frequency band, or a global positioning system (GPS) frequency band, etc. The implementation manner of the present application does not limit the target frequency band.

[0057] The working principle of the antenna assembly 30 provided in the embodiment of the present application is described and explained below.

[0058] In this embodiment, the circuit board 10 is a main board. The characteristic mode is an inherent mode that characterizes the floor 111 of the circuit board 10. By analyzing the characteristic mode (also called characteristic mode) of the circuit board 10, the most suitable feeding position can be found according to the boundary conditions. The following is an example of the target frequency band supported by the antenna assembly 30 being a low-frequency band. The characteristic current with the largest proportion of the longitudinal current mode can be obtained through simulation. Please refer to Figure 5 and Figure 6 , Figure 5 A schematic diagram of the distribution of the characteristic current with the largest proportion of longitudinal current corresponding to the characteristic mode of the circuit board; Figure 6 for Figure 5 The current distribution of the characteristic mode is mainly characterized by the sinusoidal behavior of the edge of the circuit board 10, which is represented by Figure 5 It can be seen that the characteristic mode has a maximum and a minimum current distribution at a specific position. In addition to the current distribution, the voltage distribution, that is, the electric field distribution on the circuit board 10, can also be considered. The difference between the phase of the electric field distribution in the circuit board 10 and the phase of the current distribution is 90°. That is, the minimum value of the electric field distribution in the circuit board 10 is the same as the maximum value of the current distribution in the circuit board 10; conversely, the maximum value of the electric field distribution in the circuit board 10 is the same as the minimum value of the current distribution in the circuit board 10. Figure 5 In the figure, the curve J next to the circuit board 10 is used to represent the current distribution of the circuit board 10, and the curve V is used to represent the voltage distribution of the floor 111 of the circuit board 10. Curve J shows that the current distribution of the floor 111 of the circuit board 10 is a sine distribution. It can be seen from curve J that the two ends of the floor 111 of the circuit board 10 are the places where the current is the smallest, and the middle position of the floor 111 of the circuit board 10 is the place where the current is the strongest. Curve V shows that the electric field distribution of the floor 111 of the circuit board 10 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 circuit board 10 (that is, the minimum electric field distribution of the circuit board 10) 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 circuit board 10 (that is, the maximum electric field distribution of the circuit board 10) to excite the characteristic mode. Please refer to Figure 6 ,exist Figure 6In the figure, there is a current weak point area 110a of the characteristic mode current distribution of the floor 111 in the circuit board 10, and a current strong point area 110b of the characteristic mode current distribution of the floor 111 in the circuit board 10. However, the size of ICE is usually large and not easy to implement; the size of CCE is relatively small and easy to implement, so CCE feeding is adopted in this case. In addition, if the antenna assembly 30 is to obtain higher radiation efficiency, it is necessary to better excite the longitudinal current distribution of the floor 111 on the circuit board 10. It should be noted that, when using CCE feeding, in addition to setting the feeding point P at the minimum point of the characteristic mode current of the floor 111, other positions other than the minimum point of the characteristic mode current in the characteristic mode current weak point area 110a of the floor 111 are also acceptable. The so-called current weak point area 110a of the characteristic mode current of the floor 111 refers to the area including the minimum value of the characteristic mode current of the floor 111. The current weak point area 110a provided in the embodiment of the present application will be quantified later. The current strong point region 110 b of the characteristic mode current of the floor panel 111 refers to a region including the maximum value of the characteristic mode of the floor panel 111 .

[0059] In this embodiment, the main radiator 310 is spaced apart from the floor 111 , so the main radiator 310 excited by the feed source S serves as a radiation driving device to constitute a CCE.

[0060] In the embodiment of the present application, the number of the current weak point areas 110a of the circuit board 10 is four. The orthographic projection of the feeding point P on the floor 111 can be located in any one of the four current weak point areas 110a of the characteristic mode current of the floor 111. Accordingly, the main radiator 310 is arranged adjacent to the current weak point area 110a where the orthographic projection of the feeding point P on the floor 111 is located.

[0061] In the antenna assembly 30 provided in the embodiment of the present application, the floor 111 constitutes the main radiation branch of the target frequency band, contributing most of the radiation of the antenna assembly 30, and the main radiator 310 is equivalent to acting as a radiation driving device for the entire antenna assembly 30, becoming the excitation condition for the floor 111 to work in the target frequency band, and the energy of the main radiator 310 accounts for a very small proportion. Therefore, in this case, reducing the size of the main radiator 310 has little effect on the overall radiation performance of the antenna assembly 30. Therefore, the size of the main radiator 310 in the antenna assembly 30 provided in the embodiment of the present application is relatively small.

[0062] See also Figure 7 , Figure 7 for Figure 1The schematic diagram of the current weak point area in the antenna assembly provided in. The current weak point area 110a is located in an area with the intersection of the extension line of the first side 1111 and the extension line of the second side 1112 as the center O and 1 / 16 of the wavelength of the target frequency band as the radius R.

[0063] In the schematic diagram of this embodiment, the connection between the first side 1111 and the second side 1112 is an arc shape. The center O is the intersection 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 between the first side 1111 and the second side 1112 is a right angle, the intersection 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.

[0064] The orthographic projection of the feeding point P on the floor 111 is located in the current weak point area 110a, and is located in a circular area with the intersection as the center O and 1 / 16 of the wavelength of the target frequency band as the radius R. It can be seen that the current weak point area 110a where the orthographic projection of the feeding point P on the floor 111 is located is fan-shaped or fan-like.

[0065] When the current weak point area 110a is selected as an area in the floor 111 with the intersection of the extension line of the first side 1111 and the extension line of the second side 1112 as the center O and 1 / 16 of the wavelength of the target frequency band as the radius R, the current in the area is relatively weak. The orthographic projection of the feeding point P on the floor 111 is set in the current weak point area 110a, which can further better excite the excitation current along the extension direction of the first side 1111, so that the antenna assembly 30 has a higher radiation efficiency in the target frequency band.

[0066] Please read further Figure 6 The floor 111 includes two first sides 1111 disposed opposite to each other, and two second sides 1112 disposed opposite to each other, the number of the current weak point areas 110a is four, the positive projection of the feeding point P on the floor 111 is located in any one of the four current weak point areas 110a, and the main radiator 310 is adjacent to the current weak point area 110a disposed at the feeding point P.

[0067] In this embodiment, the number of the current weak point areas 110a is four, and the orthographic projection of the feeding point P on the floor 111 can be located in any one of the four current weak point areas 110a, which makes the setting of the feeding point P more flexible. The main radiator 310 is arranged adjacent to the current weak point area 110a where the orthographic projection of the feeding point P on the floor 111 is located. For the convenience of description, the current weak point areas 110a are named as current weak point area 110a (1), current weak point area 110a (2), current weak point area 110a (3) and current weak point area 110a (4). In this embodiment, the orthographic projection of the feeding point P on the floor 111 is located in the current weak point area 110a (1) as an example for illustration, and accordingly, the main radiator 310 is arranged adjacent to the current weak point area 110a (1).

[0068] Please refer again Figure 1 and Figure 2 , the first parasitic radiator 320 can also be called a parasitic branch. The first parasitic radiator 320 can be a laser direct structuring (LDS) radiator, or a flexible printed circuit (FPC) radiator, or a print direct structuring (PDS) radiator, or a metal branch radiator. When the antenna assembly 30 is applied to an electronic device 1, the first parasitic radiator 320 can be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the first parasitic radiator 320 can be used with the electronic device 1 (see Figure 1 ) of plastic and metal formed middle frame 50 (see Figure 1 In addition, the first parasitic radiator 320 can also be a metal frame 520 antenna radiator designed by the metal middle frame 50.

[0069] It is understandable that the present application does not specifically limit the shape, structure and material of the first parasitic radiator 320. The shapes of the first parasitic radiator 320 include but are not limited to bent, straight, L-shaped, sheet-shaped, rod-shaped, coated, thin film, etc. When the first parasitic radiator 320 is in a strip shape, the present application does not limit the extension track of the first parasitic radiator 320, so the first parasitic radiator 320 can be extended in a straight line, a curve, a multi-segment bending track, etc. The first parasitic radiator 320 can be a line with uniform width on the extension track, or it can be an irregular shape with different widths such as a gradual width and a widened area.

[0070] The first parasitic radiator 320 and the main radiator 310 are spaced apart by a first coupling gap 320 a , and the first parasitic radiator 320 is coupled to the main radiator 310 via the first coupling gap 320 a .

[0071] In this embodiment, the first coupling gap 320a is provided between one end of the first parasitic radiator 320 and one end of the main radiator 310, and the first parasitic radiator 320 is coupled to the main radiator 310 through the first coupling gap 320a. Fig.12 ), the first parasitic radiator 320 is located on one side of the main body of the main radiator 310, and is separated from the main radiator 310 by the first coupling gap 320a.

[0072] In summary, in the antenna assembly 30 provided in the embodiment of the present application, the main radiator 310 is spaced from the floor 111, and the orthographic projection of the feeding point P on the floor 111 is located in the current weak point area 110a of the characteristic mode current of the floor 111, which can well excite the excitation current along the extension direction of the first side 1111, so that the antenna assembly 30 has a higher radiation efficiency in the target frequency band. It can be seen that the communication performance of the antenna assembly 30 provided in the embodiment of the present application is good. In addition, in the antenna assembly 30 provided in the embodiment of the present application, the floor 111 constitutes the main radiation branch of the target frequency band, contributing most of the radiation of the antenna assembly 30, and the main radiator 310 is equivalent to acting as the radiation driving device of the entire antenna assembly 30, which becomes the excitation condition for the floor 111 to work in the target frequency band, and the energy of the main radiator 310 accounts for a very small proportion. Therefore, in this case, reducing the size of the main radiator 310 has little effect on the overall radiation performance of the antenna assembly 30. In addition, in this embodiment, the main radiator 310 receives the excitation signal through the feeding point P, and supports the first frequency band of the target frequency band under the excitation of the excitation signal; the at least one parasitic radiator 320 is coupled with the main radiator 310 (in the schematic diagram of this embodiment, the first parasitic radiator 320 is coupled with the main radiator 310 through the first coupling gap 320a) to be excited by the excitation signal to generate a second frequency band supporting the target frequency band. Therefore, when the antenna assembly 30 supports the target frequency band, it can operate in the first frequency band and the second frequency band of the target frequency band. Therefore, the antenna assembly 30 can support more communication frequency bands, and the antenna assembly 30 has a larger bandwidth in the target frequency band, so it has better communication performance.

[0073] See also Figure 8 , Figure 8A schematic diagram of the flow direction of the first current of the main radiator and the second current of the first parasitic radiator in an antenna assembly provided in an embodiment of the present application. The excitation signal excites the main radiator 310 to generate a first current I1. The at least one parasitic radiator is coupled with the main radiator 310 to be excited to generate a current, wherein the current excited by the at least one parasitic radiator coupled with the main radiator 310 is opposite to the direction of the first current I1. Next, the at least one parasitic radiator includes a first parasitic radiator 320 as an example for explanation, and the first parasitic radiator 320 is coupled with the main radiator 310 to be excited to generate a second current I2, wherein the direction of the second current I2 is opposite to the direction of the first current I1. In this embodiment, both the first current I1 and the second current I2 are resonant currents. In the same resonant mode, the resonant current on each radiator will change in different half-wavelength periods. In the current half-wavelength period, the first current I1 flows from the first open end 311 to the second open end 312. In the next half-wavelength period, the first current I1 flows from the second open-circuit end 312 to the first open-circuit end 311. Correspondingly, in the current half-wavelength period, the second current I2 flows from the end (first free end 322) away from the main radiator 310 to the end (first ground end 321) adjacent to the main radiator 310. In the next half-wavelength period, the second current I2 flows from the end (first ground end 321) adjacent to the main radiator 310 to the end (first free end 322) away from the main radiator 310. Specifically, in the current half-wavelength period: the first current I1 flows from the first open-circuit end 311 to the second open-circuit end 312; and the direction of the second current I2 is opposite to that of the first current I1, that is, the second current I2 flows from the end (first free end 322) away from the main radiator 310 to the end (first ground end 321) adjacent to the main radiator 310. In the next half-wavelength period: the first current I1 flows from the second open-circuit end 312 to the first open-circuit end 311; and the direction of the second current I2 is opposite to that of the first current I1, that is, the second current I2 flows from the end (first ground end 321) adjacent to the main radiator 310 to the end (first free end 322) away from the main radiator 310. It can be understood that no matter in which half-wavelength mode, the direction of the second current I2 remains opposite to that of the first current I1.

[0074] It is understood that the flow directions of the first current I1 and the second current I2 shown in this embodiment should not be understood as limitations of the first current I1 and the second current I2.

[0075] In this embodiment, the direction of the second current I2 is opposite to the direction of the first current I1, so the magnetic field generated by the second current I2 can offset part of the magnetic field generated by the first current I1, thereby reducing the specific absorption rate (SAR) of electromagnetic waves when the antenna assembly 30 supports the target frequency band. When a user communicates using the target frequency band of the antenna assembly 30 in the electronic device 1, the radiation generated to the user is small.

[0076] In the related art (not the prior art), restricted by the international SAR safety regulations, when the SAR value of the antenna assembly 30 in the electronic device 1 is large when supporting the target frequency band during the user's use of the electronic device 1, it is necessary to reduce the SAR value of the antenna assembly 30 in the target frequency band by backing off the transmission power of the target frequency band to meet the safety requirements. However, this practice reduces the communication performance and user experience when the user uses the target frequency band of the antenna assembly 30 in the electronic device 1. The antenna assembly 30 in the electronic device 1 provided in the embodiment of the present application has little or no impact on the performance of the target frequency band when the user uses the target frequency band of the antenna assembly 30 in the electronic device 1 to communicate, and can reduce power backoff or even eliminate the need for power backoff, thereby improving the user experience.

[0077] Please read further Figure 1 , Figure 2 and Figure 8 The first parasitic radiator 320 further has a first free end 322, and the first free end 322 is away from the main radiator 310 compared to the first ground end 321. The feeding point P is located at the first open end 311, and the first ground end 321 is spaced apart from the second open end 312 to form the first coupling gap 320a.

[0078] In the antenna assembly 30 of the electronic device 1 provided in this embodiment, the feeding point P is located at the first open end 311. On the one hand, when the main radiator 310 supports the first frequency band of the target frequency band, the electrical length of the main radiator 310 can be fully utilized, so that when the first frequency band of the target frequency band supported by the main radiator 310 is constant, the electrical length of the main radiator 310 is small; on the other hand, when the electrical length of the main radiator 310 is constant, the main radiator 310 can support a lower frequency band.

[0079] In addition, the feeding point P is located at the first open end 311, and the first ground end 321 and the second open end 312 are spaced apart to form a first coupling gap 320a. Therefore, the direction of the first current I1 generated by the excitation signal stimulating the main radiator 310 is opposite to the direction of the second current I2 stimulated by the first parasitic radiator 320.

[0080] The direction of the second current I2 is opposite to that of the first current I1, so the magnetic field generated by the second current I2 can offset part of the magnetic field generated by the first current I1, thereby reducing the SAR when the antenna assembly 30 supports the target frequency band. When a user communicates using the target frequency band of the antenna assembly 30 in the electronic device 1, the radiation caused to the user is small.

[0081] For further information, please refer to Figure 1 , and the orthographic projection of the first grounding terminal 321 on the floor 111 is located in the current weak point area 110a.

[0082] In this embodiment, the first ground terminal 321 is a coupling terminal of the first parasitic radiator 320 that is coupled with the main radiator 310. When the orthographic projection of the first ground terminal 321 on the floor 111 is located in the current weak area 110a, in other words, the orthographic projection of the coupling terminal of the first parasitic radiator 320 on the floor 111 is located in the current weak area 110a. When the orthographic projection of the first ground terminal 321 on the floor 111 is located in the current weak area 110a, the first parasitic radiator can fully excite the longitudinal current of the floor 111 (the current of the half-wavelength mode of the floor 111), and can effectively improve the radiation efficiency of the antenna assembly 30. In addition, the floor 111 constitutes the main radiation branch of the target frequency band and contributes most of the radiation of the antenna assembly 30, while the first parasitic radiator 320 is equivalent to acting as a radiation driving device of the entire antenna assembly 30, becoming an excitation condition for the floor 111 to work in the target frequency band, and the energy of the first parasitic radiator 320 accounts for a very small proportion. Therefore, in this case, reducing the size of the first parasitic radiator 320 has little effect on the overall radiation performance of the antenna assembly 30. Therefore, in the antenna assembly 30 provided in the embodiment of the present application, the size of the first parasitic radiator 320 is relatively small.

[0083] See also Fig. 9 , Fig. 9A schematic diagram of an antenna assembly provided in another embodiment of the present application. The antenna assembly 30 also includes a first matching circuit M1 and a second matching circuit M2. The feed source S electrically connects the first matching circuit M1 to the feed point P, wherein the first matching circuit M1 includes an inductive device. The first ground terminal 321 is grounded through the second matching circuit M2, wherein the second matching circuit M2 includes an inductive device.

[0084] Next, the principles of the inductive devices included in the antenna assembly 30 are introduced.

[0085] Fig.10 Schematic diagram of an antenna assembly in which an inductive device replaces a radiator. Fig.10 (a) is a schematic diagram of an antenna assembly 30 without an inductive device; Fig.10 (b) is a schematic diagram of an antenna assembly 30 provided with an inductive device. The antenna assembly 30 includes an inductive device 130. One end of the inductive device 130 is electrically connected to the feed source S, and the other end of the inductive device 130 is electrically connected to the feed point P. Fig.10 visible, Fig.10 In (b), the length of the radiator of the antenna assembly 30 including the inductive device 130 is smaller.

[0086] In this embodiment, one end of the inductive device 130 in the antenna assembly 30 is electrically connected to the feed source S, and the other end is electrically connected to the feeding point P, which is equivalent to connecting the feed source S in series with the inductive device 130 to the feeding point P of the radiator 120.

[0087] It should be noted that the so-called inductive device 130 refers to a device that exhibits inductive characteristics within the target frequency band supported by the antenna assembly 30. The inductive device 130 may include at least one of the following: a single inductor; a plurality of inductors connected in series; a plurality of inductors connected in parallel; a capacitor and an inductor connected in series; a capacitor and an inductor connected in parallel, as long as the inductive device 130 exhibits inductive characteristics within the target frequency band supported by the antenna assembly 30.

[0088] Since the antenna assembly 30 provided in the embodiment of the present application has a positive projection of the feeding point P on the floor 111 located in the current weak point area 110a of the characteristic mode of the floor 111, the excitation current along the extension direction of the first side 1111 can be well excited. The floor 111 constitutes the main radiation branch of the target frequency band and contributes most of the radiation of the antenna assembly 30, while the radiator 120 is equivalent to acting as a radiation driving device for the entire antenna assembly 30, becoming the excitation condition for the floor 111 to work in the target frequency band, and the energy proportion of the radiator 120 is very small. Therefore, in this case, reducing the size of the radiator 120 has little effect on the overall radiation performance of the antenna assembly 30. Fig.10 It can also be seen that the size of the radiator 120 in the antenna assembly 30 provided with the inductive device 130 is relatively small.

[0089] The inductive device 130 can make up for the insufficiency of the inductive property caused by the miniaturization of the radiator 120 , so that the antenna assembly 30 has better antenna performance in the target frequency band, and the antenna assembly 30 can work better in the target frequency band.

[0090] From the above introduction about the inductive device included in the antenna assembly 30, it can be known that when the antenna assembly 30 includes the inductive device, the inductive device 130 can make up for the inductive deficiency caused by the miniaturization of the radiator 120 to which the inductive device is electrically connected. The antenna assembly 30 provided in the embodiment of the present application includes a first matching circuit M1, the first matching circuit M1 includes the inductive device 130, and the feed source S electrically connects the first matching circuit M1 to the feeding point P. Therefore, the inductive device 130 in the first matching circuit M1 can also make up for the inductive deficiency caused by the miniaturization of the main radiator 310, thereby enabling the main radiator 310 to have better antenna performance when supporting the first frequency band of the target frequency band. Correspondingly, the antenna assembly 30 also includes a second matching circuit M2, which includes an inductive device. The first ground terminal 321 is grounded through the second matching circuit M2. Therefore, the inductive device in the second matching circuit M2 can compensate for the lack of inductance caused by the miniaturization of the first parasitic radiator 320, thereby enabling the first parasitic radiator 320 to have better antenna performance when supporting the second frequency band of the target frequency band.

[0091] In one embodiment, the first matching circuit M1 includes an inductor, and the feed source S electrically connects the inductor to the feed point P. Specifically, the first matching circuit M1 is electrically connected to one end of the inductor, and the other end of the inductor is electrically connected to the feed point P. In another embodiment, the first matching circuit M1 may include two inductors, the first feed source S electrically connects one of the two inductors to the feed point P, one end of the other of the two inductors is electrically connected to the feed point P, and the other end of the other of the two inductors is grounded.

[0092] In one embodiment, the second matching circuit M2 includes an inductor, and the first ground terminal 321 is electrically connected to the inductor to the ground. Specifically, one end of the inductor is electrically connected to the first ground terminal 321, and the other end of the inductor is electrically connected to the ground.

[0093] It should be noted that an inductor referred to here may be composed of one or more inductors.

[0094] Please also read Fig. 9 and Fig.11 , Fig.11 for Fig. 9 Schematic diagram of the electrical length of the main radiator and the electrical length of the first parasitic radiator in the antenna assembly provided in . The electrical length L1 of the main radiator 310 satisfies: λ1 / 32≤L1≤λ1 / 8, where λ1 is the wavelength corresponding to the center frequency of the first frequency band. The electrical length L2 of the first parasitic radiator 320 satisfies: λ2 / 32≤L2≤λ2 / 8, where λ2 is the wavelength corresponding to the center frequency of the second frequency band.

[0095] The main radiator 310 is in an open-circuit state at both ends, and the electrical length of the main radiator 310 refers to the size of the extension path between the first open-circuit end 311 and the second open-circuit end 312. Considering the need for miniaturization of the main radiator 310, the electrical length of the main radiator 310 is selected as L1≤λ1 / 8; at the same time, considering that the physical length of the inductive device in the first matching circuit M1 replacing the main radiator 310 is too large and will introduce more energy loss, the electrical length of the main radiator 310 is selected as λ1 / 32≤L1. In summary, the electrical length of the main radiator 310 provided in the embodiment of the present application satisfies: λ1 / 32≤L1≤λ1 / 8, which can make the size of the main radiator 310 smaller on the one hand, and can make the antenna assembly 30 have less energy loss when supporting the first frequency band of the target frequency band on the other hand.

[0096] The first parasitic radiator 320 has a first grounding end 321 and a first free end 322, and therefore, the electrical length of the first parasitic radiator 320 refers to the size of the extension path between the first grounding end 321 and the first free end 322. Considering the need for miniaturization of the first parasitic radiator 320, the electrical length of the first parasitic radiator 320 is selected as L2≤λ2 / 8; at the same time, considering that the physical length of the inductive device in the second matching circuit M2 replacing the first parasitic radiator 320 is too large and introduces more energy loss, therefore, the electrical length of the first parasitic radiator 320 is selected as λ2 / 32≤L2. In summary, the electrical length of the first parasitic radiator 320 provided in the embodiment of the present application satisfies: λ2 / 32≤L2≤λ2 / 8, which can make the size of the first parasitic radiator 320 smaller on the one hand, and can make the antenna assembly 30 have less energy loss when supporting the second frequency band of the target frequency band on the other hand.

[0097] It should be noted that, for the main radiator 310, the electrical length L1 of the main radiator 310 satisfies the following formula:

[0098] Among them, L 01 is the physical length of the main radiator 310, a is the transmission time of the electromagnetic wave signal in the first frequency band in the medium, and b is the transmission time of the electromagnetic wave signal in the first frequency band in the free space.

[0099] For example, when the main radiator 310 is an MDA radiator, that is, the outside of the main radiator 310 is wrapped by a plastic medium, then the medium is plastic.

[0100] When the main radiator 310 is a frame 520 formed on the middle frame 50 or the main radiator 310 is not wrapped by a medium, a=b, then the electrical length of the main radiator 310 is equal to the electrical length of the main radiator 310. In other words, the length of the main radiator satisfies: λ1 / 32≤L 01 ≤λ1 / 8.

[0101] The above formula is also satisfied for the first parasitic radiator 320. That is, the electrical length L2 of the first parasitic radiator 320 satisfies the following formula:

[0102] Among them, L 02 is the physical length of the first parasitic radiator 320, c is the transmission time of the electromagnetic wave signal in the second frequency band in the medium, and d is the transmission time of the electromagnetic wave signal in the second frequency band in the free space.

[0103] For example, when the first parasitic radiator 320 is an MDA radiator, that is, the outside of the first parasitic radiator 320 is wrapped by a plastic medium, then the medium is plastic.

[0104] When the first parasitic radiator 320 is a frame 520 formed on the middle frame 50 or the first parasitic radiator 320 is not wrapped by a medium, c=d, and the electrical length of the first parasitic radiator 320 is equal to the electrical length of the first parasitic radiator 320. In other words, the length of the first parasitic radiator 320 satisfies: λ2 / 32≤L 02 ≤λ2 / 8.

[0105] See also Figure 1 The electronic device 1 further includes a middle frame 50. The middle frame 50 includes a frame body 510 and a frame 520. The frame 520 is arranged around the periphery of the frame body 510. The main radiator 310 and the first parasitic radiator 320 are formed in the frame 520.

[0106] The middle frame 50 is made of a conductive material, such as aluminum or aluminum-magnesium alloy. In one embodiment, the surface of the frame 520 away from the frame body 510 constitutes at least part of the appearance of the electronic device 1. In another embodiment, the frame 520 is located on the housing 90 (see Fig.29 ) in the receiving space of the electronic device 1. The embodiment of the present application does not limit the specific situation of the middle frame 50 in the electronic device 1.

[0107] The main radiator 310 and the first parasitic radiator 320 are formed in the frame 520. For example, in one embodiment, a gap (first gap) is provided between a portion of the frame 520 and the frame body 510, and the gap is used to separate the portion of the frame 520 from the frame body 520 to form the main radiator 310. A gap (second gap) is provided between another portion of the frame 520 and the frame body 510, and the gap is used to separate the another portion of the frame 520 from the frame body 520 to form the first parasitic branch. The frame body 510 is equivalent to the ground pole or the floor 111. In one embodiment, the first grounding terminal 321 is electrically connected to the frame body 510 for grounding. In other words, one end of the first parasitic radiator 320 is connected to the frame body 510 for grounding, and the end of the first radiator connected to the frame body 510 is called the first grounding terminal 321. In another embodiment, the first ground terminal 321 is electrically connected to the floor 111 to be grounded.

[0108] In one embodiment, the main radiator 310 and the first parasitic radiator 320 are formed on the frame 520, and the extension direction of the main radiator 310 is the same or approximately the same as the extension direction of the first parasitic radiator 320. In the schematic diagram of this embodiment, the extension direction of the main radiator 310 and the first parasitic radiator 320 is taken as the long side direction of the electronic device 1 for illustration, which is understandable and should not be understood as limiting the embodiments of the present application.

[0109] In this embodiment, the extension direction of the first side 1111 of the floor 111 is the long side direction of the electronic device 1. Therefore, in other words, the extension direction of the main radiator 310 and the first parasitic radiator 320 is the extension direction of the first side 1111 or is approximately the extension direction of the first side 1111.

[0110] The target frequency band is a low frequency band (Low Band, LB), and the antenna assembly 30 is used to support the first frequency band of the low frequency band of the 4G communication and the second frequency band of the low frequency band of the 5G communication to achieve EDNC; or, to support the second frequency band of the low frequency band of the 4G communication and the first frequency band of the low frequency band of the 5G communication to achieve EDNC.

[0111] As can be seen from the foregoing introduction, in the antenna assembly 30 provided in the embodiment of the present application, the excitation signal excites the main radiator 310 to support the first frequency band of the target frequency band, and the first parasitic radiator 320 is excited by the excitation signal to support the second frequency band of the target frequency band. Therefore, the antenna assembly 30 supports the first frequency band + the second frequency band of the target frequency band.

[0112] The target frequency band is a low-frequency band, and the antenna assembly 30 is used to support the first frequency band of the low-frequency band of the 4G communication and the second frequency band of the low-frequency band of the 5G communication, so as to realize 4G Long Term Evolution (LTE) and 5G New Radio (NR) dual connection (i.e., EDNC); or, to support the second frequency band of the low-frequency band of the 4GLT communication and the first frequency band of the low-frequency band of the 5G communication, so as to realize EDNC.

[0113] It can be seen that the antenna assembly 30 provided in the embodiment of the present application can support the (LB+LB) requirements of ENDC in the 5G era.

[0114] It should be noted that the target frequency band is a low frequency band (Low Band, LB), and the antenna assembly 30 is used to support the first frequency band of the low frequency band of the 4G communication and the second frequency band of the low frequency band of the 5G communication to achieve EDNC; or, it is used to support the second frequency band of the low frequency band of the 4G communication and the first frequency band of the low frequency band of the 5G communication to achieve EDNC, which is independent of the shape and position of the main radiator 310 and the first parasitic radiator 320. The antenna assembly 30 provided in the various embodiments described above is applicable, and the antenna assembly 30 provided in the various embodiments described later is also applicable.

[0115] Further, in one embodiment, the target frequency band is a low frequency band, and the first frequency band and the second frequency band satisfy one of the following conditions: the first frequency band is the B5 band, and the second frequency band is the B8 band; the first frequency band is the B5 band, and the second frequency band is the B20 band; the first frequency band is the B5 band, and the second frequency band is the B28 band; the first frequency band is the B8 band, and the second frequency band is the B20 band; the first frequency band is the B8 band, and the second frequency band is the B28 band; the first frequency band is the B20 band, and the second frequency band is the B28 band.

[0116] The specific situation that the target frequency band is a low frequency band, the first frequency band and the second frequency band will be described later in conjunction with a simulation diagram.

[0117] In one embodiment, by selecting the electrical length of the main radiator 310 and the electrical length of the first parasitic radiator 320, the main radiator 310 and the first parasitic radiator 320 can meet one of the above conditions in the first frequency band and the second frequency band. In another embodiment, by selecting the electrical length of the main radiator 310 and the inductive device in the first matching circuit M1, and the first parasitic radiator 320 and the inductive device in the second matching circuit M2, the main radiator 310 and the first parasitic radiator 320 can meet one of the above conditions in the first frequency band and the second frequency band. In addition, by adjusting the parameters of the first matching circuit M1 and adjusting the parameters of the second matching circuit M2, the first frequency band and the second frequency band supported by the antenna assembly 30 can be changed.

[0118] In this embodiment, the target frequency band is a low frequency band. When the first frequency band and the second frequency band satisfy one of the above conditions, the antenna assembly 30 can support a combination of corresponding frequency bands in the low frequency band and has better communication performance in the low frequency band.

[0119] It is understandable that the above example is for illustration using the target frequency band as a low frequency band, but it should not be understood as limiting the implementation of the present application. In other implementations, the target frequency band may also be other frequency bands such as a medium frequency band.

[0120] It can be understood that the target frequency band is a low frequency band, the first frequency band and the second frequency band satisfy one of the above situations, and are independent of the shape and position of the main radiator 310 and the first parasitic radiator 320. The antenna assembly 30 provided in the various embodiments described above is applicable, and the antenna assembly 30 provided in the various embodiments described later is also applicable.

[0121] See also Fig.12 , Fig.12 A schematic diagram of an antenna assembly provided in another embodiment of the present application. The first parasitic radiator 320 extends along a first direction D1, and the first parasitic radiator 320 also has a first free end 322, the first free end 322 is away from the feeding point P compared to the first ground end 321, the first ground end 321 is closer to the feeding point P than the first free end 322, and the main radiator 310 and the first parasitic radiator 320 are arranged along a second direction D2, wherein the second direction D2 is different from the first direction D1.

[0122] The first parasitic radiator 320 included in the at least one parasitic radiator in the antenna assembly 30 described in the previous embodiment is formed on the frame 520 of the middle frame 50 of the electronic device 1, and the extension direction of the main radiator 310 is the same or approximately the same as the extension direction of the first parasitic radiator 320. In this embodiment, the arrangement of the first parasitic radiator 320 and the main radiator 310 is different from the arrangement of the first parasitic radiator 320 and the main radiator 310 described in the previous embodiment. In this embodiment, the first parasitic radiator 320 extends along the first direction D1, and the main radiator 310 and the first parasitic radiator 320 are arranged along the second direction D2. In one embodiment, the first direction D1 is perpendicular to the second direction D2, or the first direction D1 is approximately perpendicular to the second direction D2. In the schematic diagram of the present embodiment, the extension direction of the main radiator 310 and the extension direction of the first parasitic radiator 320 (i.e., the first direction D1) are both the long sides of the electronic device 1, and the arrangement direction of the main radiator 310 and the first parasitic radiator 320 is the second direction D2. It can be understood that it should not be understood as a limitation on the embodiments of the present application. In the present embodiment, the extension direction of the first side 1111 of the floor 111 is the long side direction of the electronic device 1. Therefore, in other words, the extension direction of the main radiator 310 and the first parasitic radiator 320 is the extension direction of the first side 1111 or is approximately the extension direction of the first side 1111. The arrangement direction of the main radiator 310 and the first parasitic radiator 320 is the extension direction of the second side 1112 of the floor 111 or is approximately the extension direction of the second side 1112.

[0123] In this embodiment, the electronic device 1 further includes a middle frame 50. The middle frame 50 includes a frame body 510 and a frame 520. The frame 520 is arranged around the periphery of the frame body 510. The main radiator 310 is formed on the frame 520. The first parasitic radiator 320 is an LDS radiator, an FPC radiator, or a PDS radiator.

[0124] See also Fig.13 , Fig.13 A schematic diagram of an antenna assembly provided in another embodiment of the present application. The antenna assembly 30 also includes a first matching circuit M1 and a second matching circuit M2. The feed source S electrically connects the first matching circuit M1 to the feed point P, wherein the first matching circuit M1 includes an inductive device. The first ground terminal 321 is grounded through the second matching circuit M2, wherein the second matching circuit M2 includes an inductive device.

[0125] From the above introduction about the antenna assembly 30 including the inductive device, it can be known that when the antenna assembly 30 includes the inductive device, the inductive device 130 can make up for the inductive deficiency caused by the miniaturization of the size of the radiator 120 to which the inductive device is electrically connected. The antenna assembly 30 provided in the embodiment of the present application includes a first matching circuit M1, the first matching circuit M1 includes an inductive device, and the feed source S electrically connects the first matching circuit M1 to the feeding point P. Therefore, the inductive device in the first matching circuit M1 can also make up for the inductive deficiency caused by the miniaturization of the size of the main radiator 310. Correspondingly, the antenna assembly 30 also includes a second matching circuit M2, the second matching circuit M2 includes an inductive device, and the first grounding terminal 321 is grounded through the second matching circuit M2. Therefore, the inductive device in the second matching circuit M2 can make up for the inductive deficiency caused by the miniaturization of the size of the first parasitic radiator 320.

[0126] See also Fig.14 , Fig.14 for Fig.12 A schematic diagram of the electrical length of the main radiator and the electrical length of the first parasitic radiator in the antenna assembly provided in . Among them, Fig.14 (a) in Fig.12 A schematic diagram of the electrical length of the main radiator in the antenna assembly provided in; Fig.14 (b) in Fig.12 Schematic diagram of the electrical length of the first parasitic radiator in the antenna assembly provided in . The electrical length L1 of the main radiator 310 satisfies: λ1 / 32≤L1≤λ1 / 8, where λ1 is the wavelength corresponding to the center frequency of the first frequency band. The electrical length L2 of the first parasitic radiator 320 satisfies: λ2 / 32≤L2≤λ2 / 8, where λ2 is the wavelength corresponding to the center frequency of the second frequency band.

[0127] The main radiator 310 is in an open-circuit state at both ends, and the electrical length of the main radiator 310 refers to the size of the extension path between the first open-circuit end 311 and the second open-circuit end 312. Considering the need for miniaturization of the main radiator 310, the electrical length of the main radiator 310 is selected as L1≤λ1 / 8; at the same time, considering that the physical length of the inductive device in the first matching circuit M1 replacing the main radiator 310 is too large and will introduce more energy loss, the electrical length of the main radiator 310 is selected as λ1 / 32≤L1. In summary, the electrical length of the main radiator 310 provided in the embodiment of the present application satisfies: λ1 / 32≤L1≤λ1 / 8, which can make the size of the main radiator 310 smaller on the one hand, and can make the antenna assembly 30 have less energy loss when supporting the first frequency band of the target frequency band on the other hand.

[0128] The first parasitic radiator 320 has a first grounding end 321 and a first free end 322, and therefore, the electrical length of the first parasitic radiator 320 refers to the size of the extension path between the first grounding end 321 and the first free end 322. Considering the need for miniaturization of the first parasitic radiator 320, the electrical length of the first parasitic radiator 320 is selected as L2≤λ2 / 8; at the same time, considering that the physical length of the inductive device in the second matching circuit M2 replacing the first parasitic radiator 320 is too large and introduces more energy loss, therefore, the electrical length of the first parasitic radiator 320 is selected as λ2 / 32≤L2. In summary, the electrical length of the first parasitic radiator 320 provided in the embodiment of the present application satisfies: λ2 / 32≤L2≤λ2 / 8, which can make the size of the first parasitic radiator 320 smaller on the one hand, and can make the antenna assembly 30 have less energy loss when supporting the second frequency band of the target frequency band on the other hand.

[0129] In this embodiment, the first parasitic radiator 320 is an LDS radiator, an FPC radiator, or a PDS radiator.

[0130] In this embodiment, the first parasitic radiator 320 may be disposed on the inner side of a battery cover of the electronic device 1 , or on a bracket of a mainboard.

[0131] In this embodiment, the first parasitic radiator 320 is an LDS radiator, or an FPC radiator, or a PDS radiator, rather than a border 520 formed on the middle frame 50 of the electronic device 1. Therefore, when the border 520 of the middle frame 50 of the electronic device 1 is away from the surface of the frame body 510 and constitutes at least part of the appearance surface of the electronic device 1, the border 520 has fewer breaks, so that the electronic device 1 has better appearance consistency.

[0132] See also Fig.15 and Fig.16 , Fig.15 A schematic diagram of an antenna assembly provided in another embodiment of the present application; Fig.16 for Fig.15The equivalent schematic diagram of the partial structure of the electronic device shown. The electronic device 1 includes a floor 111 and an antenna assembly 30. The floor 111 includes a first side 1111 and a second side 1112 connected by bending, wherein the length of the first side 1111 is greater than the length of the second side 1112, and the floor 111 has a current weak point area 110a of the characteristic mode current. The antenna assembly 30 includes a main radiator 310, a first parasitic radiator 320 and a feed source S. The main radiator 310 has a first open end 311, a second open end 312 and a feeding point P. The main radiator 310 is arranged at a distance from the floor 111, and the orthographic projection of the feeding point P on the floor 111 is located in the current weak point area 110a. The first parasitic radiator 320 is arranged at a first coupling gap 320a and coupled with the main radiator 310, and the first parasitic radiator 320 has a first grounding end 321, and the first grounding end 321 is grounded. The feed source S electrically generates an excitation signal, and the feed source S is electrically connected to the feeding point P to excite the floor 111 through the main radiator 310 to generate a resonant current along the extension direction of the first side 1111, and the excitation signal also excites the main radiator 310 to support a first frequency band of the target frequency band, and the first parasitic radiator 320 is coupled to the main radiator 310 through the first coupling gap 320a to be excited by the excitation signal to generate a second frequency band supporting the target frequency band, wherein the resonant frequency point of the second frequency band is different from the resonant frequency point of the first frequency band.

[0133] In addition, the at least one parasitic radiator includes a first parasitic radiator 320, and the at least one parasitic radiator also includes a second parasitic radiator 330. The second parasitic radiator 330 has a second grounding terminal 331, and the second grounding terminal 331 is grounded. The second parasitic radiator 330 is arranged and coupled with the main radiator 310 with a second coupling gap 330a therebetween, and the second parasitic radiator 330 is coupled with the main radiator 310 through the second coupling gap 330a to be excited by the excitation signal to generate a third frequency band supporting the target frequency band, wherein the resonant frequency point of the third frequency band is different from the resonant frequency point of the first frequency band, and the resonant frequency point of the third frequency band is different from the resonant frequency point of the second frequency band.

[0134] The antenna assembly 30 provided in this embodiment, wherein the antenna assembly 30 further includes a second parasitic radiator 330, can be applied to the antenna assembly 30 provided in any of the previous embodiments. In the schematic diagram of this embodiment, the antenna assembly 30 further includes a second parasitic radiator 330 and is combined with the antenna assembly 30 provided in the previous embodiment for illustration, which is understandable and should not constitute a limitation on the antenna assembly 30 provided in the embodiment of the present application.

[0135] The antenna assembly 30 provided in this embodiment further includes a second parasitic radiator 330, and the second parasitic radiator 330 is used to be excited to generate a third frequency band supporting the target frequency band. Therefore, the antenna assembly 30 can support multiple frequency bands of the target frequency band and has a better communication effect in the target frequency band.

[0136] In this embodiment, the main radiator 310 and the first parasitic radiator 320 are arranged at intervals along a first direction D1; the main radiator 310 and the second parasitic radiator 330 are arranged at intervals along a second direction D2, wherein the second direction D2 is different from the first direction D1.

[0137] The first direction D1 and the second direction D2, etc., refer to the previous description and will not be repeated here. In the antenna assembly 30 provided in this embodiment, the main radiator 310 and the first parasitic radiator 320 are arranged at intervals along the first direction D1; the main radiator 310 and the second parasitic radiator 330 are arranged at intervals along the second direction D2. Therefore, the antenna assembly 30 can use the space of the electronic device 1 in the first direction D1, and can also use the space of the electronic device 1 in the second direction D2, so that the antenna assembly 30 is relatively compact.

[0138] Furthermore, the second parasitic radiator 330 further has a second free end 332 . The second free end 332 is disposed closer to the second open end 312 than the second ground end 331 , and the second ground end 331 is disposed closer to the feeding point P than the second free end 332 .

[0139] In this embodiment, the second free end 332 is disposed adjacent to the second open end 312 compared to the second ground end 331, and the second ground end 331 is disposed adjacent to the feeding point P compared to the second free end 332. In other words, the second ground end 331 is disposed adjacent to the feeding point P of the first open end 311, and the second free end 332 is disposed adjacent to the second free end 332. The positional arrangement relationship between the second parasitic radiator 330 and the main radiator 310 is such that the second parasitic radiator 330 can couple the energy of the main radiator 310 through magnetic coupling, so that the second parasitic radiator 330 can be excited to a better resonant mode, thereby supporting the third frequency band of the target frequency band.

[0140] For further information, please refer to Fig.15 , and the orthographic projection of the second grounding terminal 331 on the floor 111 is located in the current weak point area 110a.

[0141] In this embodiment, the second ground terminal 331 is a coupling terminal of the second parasitic radiator 330 coupled with the main radiator 310. The orthographic projection of the second ground terminal 331 on the floor 111 is located in the current weak area 110a. In other words, the orthographic projection of the coupling terminal of the second parasitic radiator 330 on the floor 111 is located in the current weak area 110a. When the orthographic projection of the second ground terminal 331 on the floor 111 is located in the current weak area 110a, the first parasitic radiator can fully excite the longitudinal current of the floor 111 (the current of the half-wavelength mode of the floor 111), and the radiation efficiency of the antenna assembly 30 can be effectively improved. In addition, the floor 111 constitutes the main radiation branch of the target frequency band and contributes most of the radiation of the antenna assembly 30, while the second parasitic radiator 330 is equivalent to acting as a radiation driving device of the entire antenna assembly 30, which becomes the excitation condition for the floor 111 to work in the target frequency band, and the energy of the second parasitic radiator 330 accounts for a very small proportion. Therefore, in this case, reducing the size of the second parasitic radiator 330 has little effect on the overall radiation performance of the antenna assembly 30. Therefore, in the antenna assembly 30 provided in the embodiment of the present application, the size of the second parasitic radiator 330 is relatively small.

[0142] In one embodiment, the first frequency band has a first resonant frequency point f1, the second frequency band has a second resonant frequency point f2, and the third resonant frequency band has a third resonant frequency point f3; wherein f2≤f1≤f3, or f3≤f1≤f2.

[0143] This will be introduced later in conjunction with specific simulation diagrams. In this embodiment, f2≤f1≤f3, or f3≤f1≤f2. That is, the resonant frequency of the main radiator 310 is located between the resonant frequency of the first parasitic radiator 320 and the resonant frequency of the second parasitic radiator 330. In this way, the main radiator 310 can better excite the first parasitic radiator 320, and can better excite the second parasitic radiator 330, so that the antenna assembly 30 has a better radiation efficiency in the first frequency band supported by the first parasitic radiator 320, and the antenna assembly 30 has a better radiation efficiency in the second frequency band supported by the second parasitic radiator 330.

[0144] See also Fig.17 , Fig.17A schematic diagram of an antenna assembly provided in another embodiment of the present application. The antenna assembly 30 further includes a first matching circuit M1 and a second matching circuit M2. The feed source S electrically connects the first matching circuit M1 to the feeding point P, wherein the first matching circuit M1 includes an inductive device. The first ground terminal 321 is grounded through the second matching circuit M2, wherein the second matching circuit M2 includes an inductive device.

[0145] In addition, in this embodiment, the antenna assembly 30 further includes a third matching circuit M3. The second ground terminal 331 is grounded through the third matching circuit M3, wherein the third matching circuit M3 includes an inductive device.

[0146] From the above introduction about the principle of the antenna assembly 30 including the inductive device, it can be known that the inductive device 130 can make up for the insufficiency of inductance caused by the miniaturization of the size of the radiator 120 to which the inductive device is electrically connected. The antenna assembly 30 provided in the embodiment of the present application includes a third matching circuit M3, the third matching circuit M3 includes an inductive device, and the second grounding terminal 331 is grounded through the third matching circuit M3. Therefore, the inductive device in the third matching circuit M3 can make up for the insufficiency of inductance caused by the miniaturization of the size of the second parasitic radiator 330, thereby enabling the first parasitic radiator 320 to have better antenna performance when supporting the third frequency band of the target frequency band.

[0147] See also Fig.18 , Fig.18 for Fig.17 Schematic diagram of the electrical length of the second parasitic radiator in the antenna assembly provided in. The electrical length L3 of the second parasitic radiator 330 satisfies λ3 / 32≤L3≤λ3 / 8, where λ3 is the wavelength corresponding to the center frequency of the third frequency band.

[0148] The second parasitic radiator 330 has a second ground terminal 331 and a second free terminal 332, and therefore, the electrical length of the second parasitic radiator 330 refers to the size of the extension path between the second ground terminal 331 and the second free terminal 332. Considering the need for miniaturization of the second parasitic radiator 330, the electrical length of the second parasitic radiator 330 is selected as L3≤λ3 / 8; at the same time, considering that the physical length of the inductive device in the third matching circuit M3 replacing the second parasitic radiator 330 is too large and introduces more energy loss, therefore, the electrical length of the second parasitic radiator 330 is selected as λ3 / 32≤L3. In summary, the electrical length of the second parasitic radiator 330 provided in the embodiment of the present application satisfies: λ3 / 32≤L3≤λ3 / 8, which can make the size of the second parasitic radiator 330 smaller on the one hand, and can make the antenna assembly 30 have less energy loss when supporting the third frequency band of the target frequency band on the other hand.

[0149] The above formula is also satisfied for the second parasitic radiator 330. That is, the electrical length L3 of the second parasitic radiator 330 satisfies the following formula:

[0150] Among them, L 03 is the physical length of the second parasitic radiator 330, m is the transmission time of the electromagnetic wave signal in the second frequency band in the medium, and n is the transmission time of the electromagnetic wave signal in the second frequency band in the free space.

[0151] For example, when the second parasitic radiator 330 is an MDA radiator, that is, the outside of the second parasitic radiator 330 is wrapped by a plastic medium, then the medium is plastic.

[0152] When the second parasitic radiator 330 is a frame 520 formed on the middle frame 50 or the second parasitic radiator 330 is not wrapped by a medium, m=n, and the electrical length of the second parasitic radiator 330 is equal to the electrical length of the second parasitic radiator 330. In other words, the length of the second parasitic radiator 330 satisfies: λ3 / 32≤L 03 ≤λ3 / 8.

[0153] The second parasitic radiator 330 is an LDS radiator, an FPC radiator, or a PDS radiator.

[0154] In this embodiment, the second parasitic radiator 330 may be disposed on the inner side of a battery cover of the electronic device 1 , or on a bracket of a mainboard.

[0155] In this embodiment, the middle frame 50 includes a frame body 510 and a frame 520. The frame 520 is arranged around the periphery of the frame body 510. The main radiator 310 and the first parasitic radiator 320 are formed in the frame 520. The second parasitic radiator 330 is an LDS radiator, an FPC radiator, or a PDS radiator, instead of being formed in the frame 520 of the middle frame 50 of the electronic device 1. Therefore, when the frame 520 of the middle frame 50 of the electronic device 1 is away from the surface of the frame body 510 and constitutes at least part of the appearance surface of the electronic device 1, the frame 520 has fewer breaks, so that the electronic device 1 has better appearance consistency.

[0156] Next, the performance of the antenna assembly 30 provided in the embodiment of the present application is simulated.

[0157] See also Fig.19 , Fig.19 for Fig. 9The S parameter simulation diagram of the antenna assembly shown in . In this simulation diagram, the horizontal axis is the frequency in GHz, and the vertical axis is the S parameter (S Parameters) in dB. Curve ① is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter a and the parameter of the second matching circuit M2 is a'; Curve ② is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter b and the parameter of the second matching circuit M2 is b'; Curve ③ is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter c and the parameter of the second matching circuit M2 is c'; Curve ④ is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter d and the parameter of the second matching circuit M2 is d'; Curve ⑤ is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter e and the parameter of the second matching circuit M2 is e'; Curve ⑥ is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter f and the parameter of the second matching circuit M2 is f'. As can be seen from any one of curves ① to ⑥, the antenna assembly 30 supports the first frequency band and the second frequency band of the target frequency band (in this embodiment, the target frequency band is taken as an example to illustrate the low frequency band). Among them, as can be seen from curve ①, the antenna assembly 30 supports the B5 frequency band (824MHz-894MHz) and the B8 frequency band (880MHz-960MHz) of the low frequency band; that is, the first frequency band is one of the B5 frequency band and the B8 frequency band, and the second frequency band is the other of the B5 frequency band and the B8 frequency band. As can be seen from curve ②, the antenna assembly 30 supports the B5 frequency band and the B20 frequency band (791MHz-862MHz) of the low frequency band; that is, the first frequency band is one of the B5 frequency band and the B20 frequency band, and the second frequency band is the other of the B5 frequency band and the B20 frequency band. As can be seen from curve ③, the antenna assembly 30 supports the B5 band and the B28 band (703MHz-803MHz) of the low-frequency band, that is, the first band is one of the B5 band and the B28 band, and the second band is the other of the B5 band and the B28 band. As can be seen from curve ④, the antenna assembly 30 supports the B8 band and the B20 band of the low-frequency band, that is, the first band is one of the B8 band and the B20 band, and the second band is the other of the B8 band and the B20 band. As can be seen from curve ⑤, the antenna assembly 30 supports the B8 band and the B28 band of the low-frequency band, that is, the first band is one of the B8 band and the B28 band, and the second band is the other of the B8 band and the B28 band. As can be seen from curve ⑥, the antenna assembly 30 supports the B20 band and the B28 band in the low-frequency band, that is, the first band is one of the B20 band and the B28 band, and the second band is the other of the B20 band and the B28 band.

[0158] See also Fig. 20 , Fig. 20 for Fig. 9 The system radiation efficiency simulation diagram of the S parameters of the antenna component shown in . In this simulation diagram, the horizontal axis is frequency, the unit is GHz, and the vertical axis is system radiation efficiency (System Rad. Efficiency), the unit is dB. Among them, curve ① is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter a and the parameter of the second matching circuit M2 is a'; curve ② is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter b and the parameter of the second matching circuit M2 is b'; curve ③ is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter c and the parameter of the second matching circuit M2 is c'. rate; Curve ④ is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter d and the parameter of the second matching circuit M2 is d'; Curve ⑤ is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter e and the parameter of the second matching circuit M2 is e'; Curve ⑥ is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter f and the parameter of the second matching circuit M2 is f'. It can be seen from any one of Curve ① to Curve ⑥ that the antenna component 30 has good radiation efficiency when supporting the first frequency band of the target frequency band (in this embodiment, the target frequency band is a low frequency band as an example for illustration), and the antenna component 30 has good radiation efficiency when supporting the second frequency band of the target frequency band, which can meet the requirements of the radiation efficiency of the first frequency band and the radiation efficiency of the second frequency band when the electronic device 1 is used.

[0159] See also Fig.21 , Fig.21 for Fig.12The S parameter simulation diagram of the antenna assembly shown in . In this simulation diagram, the horizontal axis is the frequency in GHz, and the vertical axis is the S parameter (S Parameters) in dB. Curve ① is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter A and the parameter of the second matching circuit M2 is A'; Curve ② is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter B and the parameter of the second matching circuit M2 is B'; Curve ③ is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter C and the parameter of the second matching circuit M2 is C'; Curve ④ is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter D and the parameter of the second matching circuit M2 is D'; Curve ⑤ is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter E and the parameter of the second matching circuit M2 is E'; Curve ⑥ is an S parameter curve when the parameter of the first matching circuit M1 in the antenna component 30 is parameter F and the parameter of the second matching circuit M2 is F'. As can be seen from any one of curves ① to ⑥, the antenna assembly 30 supports the first frequency band and the second frequency band of the target frequency band (in this embodiment, the target frequency band is taken as an example to illustrate the low frequency band). As can be seen from curve ①, the antenna assembly 30 supports the B5 frequency band and the B8 frequency band of the low frequency band; that is, the first frequency band is one of the B5 frequency band and the B8 frequency band, and the second frequency band is the other of the B5 frequency band and the B8 frequency band. As can be seen from curve ②, the antenna assembly 30 supports the B5 frequency band and the B20 frequency band of the low frequency band; that is, the first frequency band is one of the B5 frequency band and the B20 frequency band, and the second frequency band is the other of the B5 frequency band and the B20 frequency band. As can be seen from curve ③, the antenna assembly 30 supports the B5 band and the B28 band of the low frequency band, that is, the first band is one of the B5 band and the B28 band, and the second band is the other of the B5 band and the B28 band. As can be seen from curve ④, the antenna assembly 30 supports the B8 band and the B20 band of the low frequency band, that is, the first band is one of the B8 band and the B20 band, and the second band is the other of the B8 band and the B20 band. As can be seen from curve ⑤, the antenna assembly 30 supports the B8 band and the B28 band of the low frequency band, that is, the first band is one of the B8 band and the B28 band, and the second band is the other of the B8 band and the B28 band. As can be seen from curve ⑥, the antenna assembly 30 supports the B20 band and the B28 band in the low-frequency band, that is, the first band is one of the B20 band and the B28 band, and the second band is the other of the B20 band and the B28 band.

[0160] See also Fig. 22 , Fig. 22 for Fig.12The system radiation efficiency simulation diagram of the S parameters of the antenna component shown in . In this simulation diagram, the horizontal axis is frequency, the unit is GHz, and the vertical axis is system radiation efficiency (System Rad. Efficiency), the unit is dB. Among them, curve ① is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter A and the parameter of the second matching circuit M2 is A'; curve ② is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter B and the parameter of the second matching circuit M2 is B'; curve ③ is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter C and the parameter of the second matching circuit M2 is C'. Rate; Curve ④ is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter D and the parameter of the second matching circuit M2 is D'; Curve ⑤ is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter E and the parameter of the second matching circuit M2 is E'; Curve ⑥ is the system radiation efficiency of the first frequency band and the second frequency band when the parameter of the first matching circuit M1 in the antenna component 30 is parameter F and the parameter of the second matching circuit M2 is F'. Among them, curve ⑥ and curve ③ basically coincide. It can be seen from any one of curves ① to ⑥ that the antenna component 30 has good radiation efficiency when supporting the first frequency band of the target frequency band (in this embodiment, the target frequency band is a low frequency band as an example for illustration), and the antenna component 30 has good radiation efficiency when supporting the second frequency band of the target frequency band, which can meet the requirements of the radiation efficiency of the first frequency band and the radiation efficiency of the second frequency band when the electronic device 1 is used.

[0161] In one embodiment, Fig. 9 and Fig.12 In the antenna assembly 30 provided, when Fig. 9 The first frequency band supported by the antenna assembly 30 is Fig.12 The first frequency band supported by the antenna assembly 30 is the same as that of Fig. 9 The second frequency band supported by the antenna assembly 30 is Fig.12 When the second frequency band supported by the antenna assembly 30 is the same, Fig. 9 The electrical length of the main radiator 310 is Fig.12 The electrical length of the main radiator 310 in is the same, Fig. 9 The electrical length of the first parasitic radiator 320 is Fig.12 The electrical length of the first parasitic radiator 320 in is the same, and accordingly, Fig. 9 The parameters of the first matching circuit M1 are Fig.12 The parameters of the first matching circuit M1 in are the same as those in Fig. 9The parameters of the second matching circuit M2 are Fig.12 The parameters of the second matching circuit M2 in the embodiment are the same. For example, parameter A is equal to parameter a, and parameter a' is equal to parameter A'.

[0162] It can be understood that in another embodiment, Fig. 9 and Fig.12 In the antenna assembly 30 provided, when Fig. 9 The first frequency band supported by the antenna assembly 30 is Fig.12 The first frequency band supported by the antenna assembly 30 is the same as that of Fig. 9 The second frequency band supported by the antenna assembly 30 is Fig.12 When the second frequency band supported by the antenna assembly 30 is the same, Fig. 9 The electrical length of the main radiator 310 is Fig.12 The electrical length of the main radiator 310 in may also be different; and / or, Fig. 9 The electrical length of the first parasitic radiator 320 is Fig.12 The electrical length of the first parasitic radiator 320 in may also be different; and / or, Fig. 9 The parameters of the first matching circuit M1 are Fig.12 The parameters of the first matching circuit M1 in are different; and / or, Fig. 9 The parameters of the second matching circuit M2 are Fig.12 The parameters of the second matching circuit M2 in are the same.

[0163] See also Fig.23 , Fig.23 for Fig.17 The S parameter simulation diagram of the antenna assembly shown in . In this simulation diagram, the horizontal axis is frequency, the unit is GHz, and the vertical axis is S parameters (S Parameters), the unit is dB. It can be seen from this simulation diagram that the antenna assembly 30 supports the first frequency band, the second frequency band and the third frequency band of the target frequency band (the low frequency band in this embodiment). In other words, it can be seen from this simulation diagram that there are three resonant frequency points in the S parameter curve (also called impedance bandwidth curve) of this embodiment. Therefore, the antenna assembly 30 provided in the embodiment of the present application has a broadband characteristic and can basically cover the entire low frequency band. In addition, in this simulation diagram, the frequency bands corresponding to the three resonant frequency points in the S parameter curve are generated by the first parasitic radiator 320, the main radiator 310, and the second parasitic radiator 330 in order from small to large. Specifically, the frequency band corresponding to the resonance point a is generated by the first parasitic radiator 320, the frequency band corresponding to the resonance point b is generated by the main radiator 310, and the frequency band corresponding to the resonance point c is generated by the second parasitic radiator 330.

[0164] See also Fig.24 , Fig.24 for Fig.17The system radiation efficiency and system total efficiency simulation diagram of the S parameters of the antenna assembly shown in . In this simulation diagram, the horizontal axis is the frequency in GHz, and the vertical axis is the efficiency in dB. Among them, curve ① is Fig.17 The system radiation efficiency (System Rad. Efficiency) curve of the antenna assembly 30 shown in FIG. 2 is Fig.17 The system total efficiency (System Tot. Efficiency) curve of the antenna assembly 30 shown. It can be seen from curves ① and ② of this simulation diagram that the antenna assembly 30 provided in the embodiment of the present application has good system radiation efficiency and system total efficiency in the first frequency band of the target frequency band; accordingly, the antenna assembly 30 has good system radiation efficiency and system total efficiency in the second frequency band of the target frequency band; accordingly, the antenna assembly 30 has good system radiation efficiency and system total efficiency in the third frequency band of the target frequency band.

[0165] In order to illustrate that the antenna assembly 30 provided in an embodiment of the present application can reduce the SAR effect when the antenna assembly 30 supports the target frequency band, the antenna assembly 30 in the related art without a parasitic radiator will be compared and analyzed with an embodiment of the antenna assembly 30 in an embodiment of the present application, in which the main radiator 310 and the first parasitic radiator 320 are included and the second current I2 of the first parasitic radiator 320 flows in the opposite direction to the first current I1 of the main radiator 310.

[0166] See also Fig.25 and Fig.26 , Fig.25 is a schematic diagram of an antenna assembly without a parasitic radiator in the related art; Fig.26 for Fig.25 Schematic diagram of the electrical length of the main radiator in the antenna assembly shown in . Fig.25 In the related art (not the prior art), the antenna assembly 30 only includes a main radiator 310, an antenna switch (Tuner) SW and a feed source S, but does not include parasitic radiation, that is, it does not include the first parasitic radiation, the second parasitic radiation, and other parasitic radiation. The antenna assembly 30 in the related art is a miniaturized antenna using a CCE feeding method. The main radiator 310 includes a first open end 311, a second open end 312 and a feeding point P. The feed source S electrically connects the antenna switch SW to the feeding point P. The electrical length L1 of the main radiator 310 of the antenna assembly 30 in the related embodiment satisfies: λ1 / 32≤L1≤λ1 / 8.

[0167] See also Fig. 27 , Fig. 27 for Fig.25 The antenna assembly in the related art shown in FIG. Figure 2SAR heat map of the antenna assembly shown. Fig. 27 (a) is a SAR thermal image of the antenna assembly 30 in the related art at 0.85 GHz; Fig. 27 (b) of this application Figure 1 The SAR thermal diagram of the antenna assembly 30 at 0.85 GHz is shown. Fig. 27 (a) and Fig. 27 As can be seen from (b) in the embodiment of the present application, the antenna assembly 30 (see Fig. 27 (b)) relative to the antenna assembly 30 in the related art (see Fig. 27 As for (a)), the SAR heat map of the antenna assembly 30 provided in the embodiment of the present application is more dispersed and the SAR peak value is also smaller. It can be understood that in Fig. 27 The simulation is performed by taking the antenna assembly 30 of the related art and the antenna assembly 30 of one embodiment of the present application as examples of both operating at 0.85 GHz, which should not be understood as limiting the frequency bands in which the antenna assembly 30 of the related art and the present application operates. When the antenna assembly 30 of the related art and the antenna assembly 30 of the embodiment of the present application operate in other frequency bands, the SAR value of the antenna assembly 30 provided in the embodiment of the present application operating in the other frequency bands is also satisfied to be less than the SAR value of the antenna assembly 30 in the related art when operating in the other frequency bands.

[0168] See also Fig.28 , Fig.28 for Fig.25 The antenna assembly in the related art shown in FIG. Figure 2 The current distribution diagram of the antenna assembly is shown in FIG. Fig.28 (a) in this application Figure 2 A schematic diagram of current distribution of the antenna assembly 30 is shown; Fig.28 (b) in Fig.25 Schematic diagram of current distribution of antenna assembly 30 in the related art shown in FIG. Fig.28 In the simulation, the antenna assembly 30 in the related art and the antenna assembly 30 provided in the embodiment of the present application are both operated at 0.85 GHz. It can be understood that this should not be understood as a limitation on the first frequency band supported by the antenna assembly 30 in the related art and the antenna assembly 30 provided in the embodiment of the present application. Fig.28 As can be seen from (a) in FIG. 1 , the excitation signal excites the main radiator 310 to generate a first current I1. The first parasitic radiator 320 is coupled with the main radiator 310 to be excited to generate a second current I2, wherein the direction of the second current I2 is opposite to the direction of the first current I1.

[0169] The direction of the second current I2 is opposite to that of the first current I1, so the magnetic field generated by the second current I2 can offset part of the magnetic field generated by the first current I1, thereby reducing the specific absorption rate (SAR) of electromagnetic waves when the antenna assembly 30 supports the target frequency band. When a user communicates using the target frequency band of the antenna assembly 30 in the electronic device 1, the radiation generated to the user is small.

[0170] It can be seen from the simulation diagram of this embodiment that the second parasitic radiator 330 is coupled with the main radiator 310 to be stimulated to generate a third current I3 , wherein the direction of the third current I3 is opposite to the direction of the first current I1 .

[0171] The direction of the third current I3 is opposite to that of the first current I1, so the magnetic field generated by the third current I3 can offset part of the magnetic field generated by the first current I1, thereby reducing the specific absorption rate (SAR) of electromagnetic waves when the antenna assembly 30 supports the target frequency band. When a user communicates using the target frequency band of the antenna assembly 30 in the electronic device 1, the radiation generated to the user is small.

[0172] In summary, when the antenna assembly 30 provided by the embodiment of the present application is compared with the antenna assembly 30 in the related art, the antenna assembly 30 provided by the embodiment of the present application has a lower SAR value than the antenna assembly 30 in the related art when operating in the same frequency band.

[0173] The antenna assembly 30 of the electronic device 1 (such as a mobile phone, etc.) in the related art usually switches different matching states through an antenna switch SW (also called a switching switch, English Tuner) to achieve coverage of the entire low-frequency band (703MHz~960MHz, B28 band~B8 band). Since the antenna assembly 30 includes the antenna switch SW, the cost of the antenna assembly 30 is increased. In addition, the antenna assembly 30 including the antenna switch SW will also introduce insertion loss. Furthermore, since the antenna assembly 30 in the related art switches different matching states through the antenna switch SW to support the corresponding frequency bands in the low-frequency band (such as B28, B20, B5, B8, etc.), the antenna assembly 30 in the related art cannot work in these frequency bands at the same time, so there is no way to achieve ENDC (also called ENDC (L+L)) of one frequency band of the low-frequency band and another frequency band of the low-frequency band. However, in the 5G era, ENDC (L+L) is an important function of the electronic device 1.

[0174] In addition, the length of the radiator supporting the low-frequency band of the antenna assembly 30 in the related art is relatively large. If a parasitic radiator (also called a parasitic branch) is added to widen or realize a multi-resonance design, the length of the parasitic branch is relatively long (usually about 75 mm). In this way, the sum of the lengths of the radiator and the parasitic radiator is relatively long (usually about 150 mm), which is almost close to the length of the long side of the mobile phone, and occupies too much antenna space of the mobile phone. When the mobile phone includes two or more antennas supporting the low-frequency band, the antenna assembly 30 in the related art will occupy more antenna space. However, in addition to the antenna supporting the low-frequency band, the mobile phone and other electronic devices 1 also need to design more other antennas, and there is not so much antenna space for the antenna supporting the low-frequency band. Therefore, when the antenna assembly 30 in the mobile phone and other electronic devices 1 on the market supports the low-frequency band, it is difficult to realize the broadband and multi-resonance design by adopting the main branch and then adding the parasitic branch in the actual mobile phone and other electronic devices 1. In addition, since the antenna component 30 in the related technology supports the low-frequency band, the antenna switch SW (also called switching switch, Tuner in English) is used to switch different matching states to achieve coverage of the entire low-frequency band (703MHz~960MHz, B28 band~B8 band), in order to consider the switching of each low-frequency band, there is no way to reduce the antenna switch SW of the antenna supporting the low-frequency band.

[0175] The antenna assembly 30 provided in one embodiment of the present application utilizes antenna miniaturization technology to reduce the size of the main radiator 310. Therefore, the antenna assembly 30 uses a first parasitic radiator 320 coupled to the main radiator 310 to expand the bandwidth or generate multi-resonance industry bottlenecks. The antenna miniaturization technology described here refers to the radiator (including the main radiator 310 and each parasitic radiator) introduced above to excite the current of the floor 111, and the floor 111 constitutes the main branch of the corresponding frequency band supporting the target frequency band, and the radiator (including the main radiator 310 and each parasitic radiator) acts as a radiation driving device, and reducing the size (usually the length) of the radiator will not affect the radiation efficiency.

[0176] Specifically, for the main radiator 310, the positive projection of the feeding point P of the main radiator 310 on the floor 111 is located in the current weak point area 110a of the floor 111. The floor 111 constitutes the main radiation branch of the first frequency band of the target frequency band, and contributes most of the radiation of the antenna assembly 30 supporting the first frequency band of the target frequency band. The main radiator 310 is equivalent to acting as a radiation driving device for the entire antenna assembly 30 to support the first frequency band of the target frequency band, and becomes the excitation condition for the floor 111 to work in the first frequency band of the target frequency band. The energy proportion of the main radiator 310 is very small. Therefore, in this case, reducing the electrical length of the main radiator 310 has little effect on the overall radiation performance of the antenna assembly 30 when supporting the first frequency band of the target frequency band.

[0177] For the first parasitic radiator 320, the first parasitic radiator 320 excites the current of the floor 111, and the floor 111 constitutes the main radiation branch of the second frequency band of the target frequency band, and contributes most of the radiation of the second frequency band of the target frequency band supported by the antenna assembly 30, and the first parasitic radiator 320 is equivalent to acting as a radiation driving device for the antenna assembly 30 to support the second frequency band of the target frequency band, and becomes the excitation condition for the floor 111 to work in the second frequency band of the target frequency band. The energy of the first parasitic radiator 320 accounts for a very small proportion. Therefore, in this case, reducing the electrical length of the first parasitic radiator 320 has little effect on the overall radiation performance of the antenna assembly 30 when supporting the second frequency band of the target frequency band.

[0178] For the second parasitic radiator 330, the second parasitic radiator 330 excites the current of the floor 111, and the floor 111 constitutes the main radiation branch of the third frequency band of the target frequency band, contributing most of the radiation of the antenna assembly 30 supporting the third frequency band of the target frequency band, and the second parasitic radiator 330 is equivalent to acting as a radiation driving device for the antenna assembly 30 to support the third frequency band of the target frequency band, and becomes the excitation condition for the floor 111 to work in the third frequency band of the target frequency band. The energy of the second parasitic radiator 330 accounts for a very small proportion, so in this case, reducing the electrical length of the second parasitic radiator 330 has little effect on the overall radiation performance of the antenna assembly 30 when supporting the third frequency band of the target frequency band. In other words, in this embodiment, the second parasitic radiator 330 has a smaller size.

[0179] The main radiator 310 and the first parasitic radiator 320 of the antenna assembly 30 provided in one embodiment of the present application both adopt antenna miniaturization technology, so the total length of the main radiator 310 and the first parasitic radiator 320 of the antenna assembly 30 provided in the embodiment of the present application is smaller than the electrical length of the main radiator 310 of the antenna assembly 30 in the related art. In addition, the main radiator 310 and the first parasitic radiator 320 of the antenna assembly 30 provided in the embodiment of the present application both adopt antenna miniaturization technology, have a wider bandwidth and multi-resonance (two resonances in the embodiment of the present application, i.e., resonance supporting the first frequency band and resonance supporting the second frequency band).

[0180] When the target frequency band is a low frequency band, the main radiator 310 and the first parasitic radiator 320 in the antenna assembly 30 provided in the embodiment of the present application do not need an antenna switch SW, breaking the industry bottleneck that the radiator supporting low frequency in the electronic device 1 (such as a mobile phone) in the related art needs to use an antenna switch SW. In addition, since the main radiator 310 and the first parasitic radiator 320 of the antenna assembly 30 do not need an antenna switch SW, the cost of the antenna assembly 30 and the electronic device 1 to which the antenna assembly 30 is applied is saved.

[0181] When the antenna assembly 30 also includes a second parasitic radiator 330, for the second parasitic radiator 330, the second parasitic radiator 330 excites the current of the floor 111, and the floor 111 constitutes the main radiation branch of the third frequency band of the target frequency band, and contributes most of the radiation of the antenna assembly 30 supporting the third frequency band of the target frequency band, and the second parasitic radiator 330 is equivalent to acting as a radiation driving device for the antenna assembly 30 to support the third frequency band of the target frequency band, and becomes an excitation condition for the floor 111 to work in the third frequency band of the target frequency band. The energy of the second parasitic radiator 330 accounts for a very small proportion. Therefore, in this case, reducing the electrical length of the second parasitic radiator 330 has little effect on the overall radiation performance of the antenna assembly 30 when supporting the third frequency band of the target frequency band.

[0182] When the target frequency band is a low frequency band, the second parasitic radiator 330 in the antenna assembly 30 provided in the embodiment of the present application does not need an antenna switch SW, breaking the industry bottleneck that the radiator supporting low frequency in the electronic device 1 (such as a mobile phone) in the related art needs to use an antenna switch SW. In addition, since the second parasitic radiator 330 of the antenna assembly 30 does not need an antenna switch SW, the cost of the antenna assembly 30 and the electronic device 1 to which the antenna assembly 30 is applied is saved.

[0183] In the antenna assembly 30 provided in one embodiment of the present application, the excitation signal excites the main radiator 310 to generate a first current I1. The first parasitic radiator 320 is coupled with the main radiator 310 to be excited to generate a second current I2, wherein the direction of the second current I2 is opposite to the direction of the first current I1, and has the performance of reducing the SAR value.

[0184] In addition, the broadband and multi-resonance effects of the antenna assembly 30 provided in one embodiment of the present application are beneficial to the design of the ENDC (L+L) solution in the 5G era.

[0185] ENDC (L+L) is a commonly used standard in the 5G era. ENDC is generally a dual-band carrier aggregation (CA) state. However, in the related art, the antennas of the electronic device 1 that support the low-frequency band are all single-wave or have only one resonant frequency point. In order to meet the L (i.e. low frequency) + L (i.e. low frequency) carrier aggregation (CA) state, the related art (not the prior art) will force two resonant frequencies to be pulled out through matching, which will affect the efficiency of the antenna. There are also related arts (not the prior art) that will add a conventional LB antenna to achieve ENDC (L+L), which will increase the cost.

[0186] The antenna assembly 30 provided in the embodiment of the present application is designed with a miniaturized main radiator 310 and a miniaturized first parasitic radiator 320, so that the antenna assembly 30 supports the first frequency band and the second frequency band of the target frequency band, and is no longer a single mode. Compared with the CA state of L+L in the related art, the antenna assembly 30 provided in the embodiment of the present application has resonance supporting the first frequency band and resonance supporting the second frequency band, so it is more advantageous to be used in ENDC (L+L). Since ENDC is generally a dual-band carrier aggregation (CA) state, the antenna assembly 30 only needs two resonant frequencies (i.e., a resonant frequency supporting the first frequency band and a resonant frequency supporting the second frequency band) to meet the requirements.

[0187] In one embodiment of the present application, the antenna assembly 30 of the electronic device 1 includes three radiators, specifically a main radiator 310, a first parasitic radiator 320, and a second parasitic radiator 330. In one embodiment of the present application, the main radiator 310 and the first parasitic radiator 320 are respectively formed on the frame 520 of the middle frame 50, and the second parasitic radiator 330 can be an LDS radiator, or an FPC radiator, or a PDS radiator, and is attached to the inner side of the battery cover (also called the back cover) of the electronic device 1, or a position adjacent to the main radiator 310 such as between straight boards.

[0188] In other embodiments, the identities of the main radiator 310 and the first parasitic radiator 320 or the second parasitic radiator 330 can be interchanged. For example, the main radiator 310 in the antenna assembly 30 introduced in the previous embodiment serves as a parasitic radiator in the antenna assembly 30 provided in other embodiments, and one of the first parasitic radiator 320 and the second parasitic radiator 330 in the antenna assembly 30 introduced in the previous embodiment serves as the main radiator 310 of the antenna assembly 30 provided in other embodiments.

[0189] The embodiment of the present application also provides an electronic device 1. The electronic device 1 includes but is not limited to a mobile phone, a telephone, a television, a tablet computer (Pad), a camera, a personal computer, a laptop computer (Personal Computer, PC), a vehicle-mounted device, a headset, a watch, a wearable device, a base station, a vehicle-mounted radar, a customer premise equipment (Customer Premise Equipment, CPE) and other devices that can send and receive electromagnetic wave signals. In this application, the electronic device 1 is taken as an example of a mobile phone, and other devices can refer to the specific description in this application. In addition, the electronic device 1 can be, but is not limited to, a device with or without a display screen 70.

[0190] The electronic device 1 includes an antenna assembly 30 as provided in any of the above embodiments. Fig.29 , Fig.29 Schematic diagram of a three-dimensional electronic device provided in one embodiment. The electronic device 1 further includes a display screen 70, a middle frame 50 and a housing 90 (also referred to as a battery cover). The display screen 70 and the housing 90 are respectively arranged on opposite sides of the middle frame 50. In one embodiment, the main radiator 310 and the first parasitic radiator 320 are formed on the frame 520 of the middle frame 50. When the main radiator 310 and the first parasitic radiator 320 are formed on the frame 520 of the middle frame 50, there is a clearance space (also referred to as a clearance area) between the frame 520 and the floor 111.

[0191] In one embodiment, the middle frame 50 and at least one of the housing 90 and the display screen 70 also form a receiving space. The electronic device 1 also includes a battery, functional devices (the functional devices may include one or more of a camera module, a microphone, a receiver, a speaker, a face recognition module, and a fingerprint recognition module) and other devices that can realize the basic functions of the mobile phone, which will not be described in detail in this embodiment. It can be understood that the above introduction to the electronic device 1 is only an explanation of an environment in which the antenna assembly 30 is applied, and the specific structure of the electronic device 1 should not be understood as a limitation on the antenna assembly 30 provided in this application.

[0192] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An electronic device, characterized in that: The electronic device comprises: A floor, the floor comprising a first side and a second side connected by a bend, wherein the length of the first side is greater than the length of the second side, and the floor has a current weak point area of ​​a characteristic mode current; and An antenna assembly, the antenna assembly comprising: A main radiator, the main radiator having a first open end, a second open end and a feeding point, the main radiator being spaced apart from the floor, and the orthographic projection of the feeding point on the floor being located in the current weak point area; at least one parasitic radiator, the at least one parasitic radiator being spaced apart from and coupled to the main radiator; and A feed source, wherein the feed source electrically generates an excitation signal, the feed source is electrically connected to the feed point to excite the floor through the main radiator to generate a resonant current along the extension direction of the first side, the excitation signal also excites the main radiator to support a first frequency band of a target frequency band, and the at least one parasitic radiator is coupled to the main radiator to be excited by the excitation signal to generate a second frequency band supporting the target frequency band, wherein the resonant frequency point of the second frequency band is different from the resonant frequency point of the first frequency band.

2. The electronic device according to claim 1, wherein: The at least one parasitic radiator comprises: A first parasitic radiator, wherein the first parasitic radiator is arranged and coupled to the main radiator with a first coupling gap therebetween, the first parasitic radiator having a first grounding end, the first grounding end being grounded, and the first coupling gap being coupled to the main radiator so as to be excited by the excitation signal to generate the second frequency band supporting the target frequency band.

3. The electronic device according to claim 2, characterized in that: The excitation signal excites the main radiator to generate a first current; The first parasitic radiator is coupled to the main radiator to be excited to generate a second current, wherein a direction of the second current is opposite to a direction of the first current.

4. The electronic device according to claim 3, characterized in that: The first parasitic radiator further has a first free end, and the first free end is away from the main radiator compared to the first ground end; The feeding point is located at the first open-circuit end, and the first grounding end is spaced apart from the second open-circuit end to form the first coupling gap.

5. The electronic device according to claim 2, characterized in that: The orthographic projection of the first ground terminal on the floor is located in the current weak point area.

6. The electronic device according to claim 2, characterized in that: The antenna assembly further comprises: a first matching circuit, the feed source electrically connecting the first matching circuit to the feed point, wherein the first matching circuit comprises an inductive device; and A second matching circuit, wherein the first grounding terminal is grounded through the second matching circuit, wherein the second matching circuit includes an inductive device.

7. The electronic device according to claim 6, characterized in that: The electrical length L1 of the main radiator satisfies: λ1 / 32≤L1≤λ1 / 8, where λ1 is the wavelength corresponding to the center frequency of the first frequency band; The electrical length L2 of the first parasitic radiator satisfies: λ2 / 32≤L2≤λ2 / 8, where λ2 is the wavelength corresponding to the center frequency of the second frequency band.

8. The electronic device according to claim 2, characterized in that: The electronic device further includes a middle frame, and the middle frame includes: a frame body; and A frame, the frame being arranged around the periphery of the frame body; Wherein, the main radiator and the first parasitic radiator are formed on the frame.

9. The electronic device according to claim 1, wherein: The target frequency band is a low-frequency band, and the antenna assembly is used to support the first frequency band of the low-frequency band of 4G communication and the second frequency band of the low-frequency band of 5G communication to achieve EDNC; or, to support the second frequency band of the low-frequency band of 4G communication and the first frequency band of the low-frequency band of 5G communication to achieve EDNC.

10. The electronic device according to claim 1, wherein: The target frequency band is a low frequency band, and the first frequency band and the second frequency band meet one of the following conditions: The first frequency band is one of the B5 frequency band and the B8 frequency band, and the second frequency band is the other of the B5 frequency band and the B8 frequency band; The first frequency band is one of the B5 frequency band and the B20 frequency band, and the second frequency band is the other of the B5 frequency band and the B20 frequency band; The first frequency band is one of the B5 frequency band and the B28 frequency band, and the second frequency band is the other of the B5 frequency band and the B28 frequency band; The first frequency band is one of the B8 frequency band and the B20 frequency band, and the second frequency band is the other of the B8 frequency band and the B20 frequency band; The first frequency band is one of the B8 frequency band and the B28 frequency band, and the second frequency band is the other of the B8 frequency band and the B28 frequency band; The first frequency band is one of a B20 frequency band and a B28 frequency band, and the second frequency band is the other of the B20 frequency band and the B28 frequency band.

11. The electronic device according to any one of claims 2 to 10, characterized in that: The at least one parasitic radiator further comprises: A second parasitic radiator, wherein the second parasitic radiator has a second grounding end, the second grounding end is grounded, the second parasitic radiator is arranged and coupled with the main radiator with a second coupling gap therebetween, the second parasitic radiator is coupled with the main radiator through the second coupling gap to be excited by the excitation signal to generate a third frequency band supporting the target frequency band, wherein a resonant frequency point of the third frequency band is different from a resonant frequency point of the first frequency band, and a resonant frequency point of the third frequency band is different from a resonant frequency point of the second frequency band.

12. The electronic device according to claim 11, characterized in that: The main radiator and the first parasitic radiator are arranged at intervals along a first direction; the main radiator and the second parasitic radiator are arranged at intervals along a second direction, wherein the second direction is different from the first direction.

13. The electronic device according to claim 11, characterized in that: The excitation signal excites the main radiator to generate a first current; The second parasitic radiator is coupled to the main radiator to be excited to generate a third current, wherein a direction of the third current is opposite to a direction of the first current.

14. The electronic device according to claim 13, characterized in that: The second parasitic radiator further has: A second free end, wherein the second free end is disposed adjacent to the second open end compared to the second ground end, and the second ground end is disposed adjacent to the feeding point compared to the second free end.

15. The electronic device according to claim 11, characterized in that: The orthographic projection of the second ground terminal on the floor is located in the current weak point area.

16. The electronic device according to claim 11, characterized in that: The first frequency band has a first resonant frequency point f1, the second frequency band has a second resonant frequency point f2, and the third resonant frequency band has a third resonant frequency point f3; wherein, f2≤f1≤f3, or, f3≤f1≤f2.

17. The electronic device according to claim 11, characterized in that: The antenna assembly further comprises: A third matching circuit, wherein the second grounding end is grounded through the third matching circuit, wherein the third matching circuit includes an inductive device.

18. The electronic device according to claim 17, characterized in that: The electrical length L3 of the second parasitic radiator satisfies: λ3 / 32≤L3≤λ3 / 8, where λ3 is the wavelength corresponding to the center frequency of the third frequency band.

19. The electronic device according to claim 11, characterized in that: The second parasitic radiator is an LDS radiator, an FPC radiator, or a PDS radiator.

20. The electronic device according to claim 1, wherein: The at least one parasitic radiator includes a first parasitic radiator, which extends along a first direction. The first parasitic radiator also has a first free end, which is away from the feeding point compared to the first ground end, and the first ground end is closer to the feeding point than the first free end, and the main radiator and the first parasitic radiator are arranged along a second direction, wherein the second direction is different from the first direction.

21. The electronic device according to claim 20, characterized in that: The electronic device further includes a middle frame, and the middle frame includes: a frame body; and A frame, the frame being arranged around the periphery of the frame body; The main radiator is formed on the frame, and the first parasitic radiator is an LDS radiator, an FPC radiator, or a PDS radiator.

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