Electronic device

Abstract

The invention provides an electronic device. The electronic equipment comprises an antenna assembly which comprises a first antenna and a second antenna. The first antenna comprises a floor, a first radiator, a first feed source and a first matching circuit, the first radiator comprises a first end and a second end, the first end is provided with a first feed point, the orthographic projection of the first feed point on the floor is located in a current weakness area of characteristic mode current of the floor, and the first feed source generates a first excitation signal; the first feed source is electrically connected to the first feed point, a first frequency band is supported through the first radiator excitation floor, the first matching circuit is arranged adjacent to the first end, one end of the first matching circuit is electrically connected to the first feed point, the other end of the first matching circuit is grounded, and the second end of the first matching circuit is a free end; the second antenna comprises a second radiator and a second feed source, the second feed source is electrically connected to the second radiator, the second antenna is further electrically connected to the second end, and the second feed source generates an NFC excitation signal to excite the first radiator and the second radiator to jointly support the NFC 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, as the number of functional devices in electronic devices increases, the layout of antenna components in electronic devices in related technologies is difficult. Summary of the invention

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

[0004] a first antenna, the first antenna comprising a floor, a first radiator, a first feed source and a first matching circuit, the first radiator comprising a first end and a second end, the first end having a first feeding point, the orthographic projection of the first feeding point on the floor being located in a current weak point region of a characteristic mode current of the floor, the first feed source being used to generate a first excitation signal, and the first feed source being electrically connected to the first feeding point, the floor being excited by exciting the first radiator to support a first frequency band, the first matching circuit being arranged adjacent to the first end, and one end of the first matching circuit being electrically connected to the first feeding point, and the other end being grounded, and the second end being a free end; and

[0005] A second antenna, wherein the second antenna includes a second radiator and a second feed source, the second feed source is electrically connected to the second radiator, and the second antenna is also electrically connected to the second end, and the second feed source is used to generate an NFC excitation signal to excite the first radiator and the second radiator to jointly support an NFC frequency band.

[0006] In summary, in the antenna assembly in the electronic device provided in the embodiment of the present application, the first matching circuit of the first antenna is arranged adjacent to the first end and electrically connected to the first feeding point, but is not arranged adjacent to the second end of the first radiator which is a free end. The second antenna is electrically connected to the second end of the first radiator which is a free end of the first antenna, but is not electrically connected to the first feeding point of the first radiator. Therefore, when the second antenna is electrically connected to the first radiator, the phenomenon that the layout is more difficult when the second antenna is electrically connected to the first feeding point of the first radiator in the related art is avoided. In other words, in the antenna assembly provided in the embodiment of the present application, the second antenna is electrically connected to the free end of the first radiator, which is relatively simple and convenient for the layout of the antenna assembly in the electronic device.

[0007] In addition, since the other end of the first matching circuit in the first antenna is grounded, the second end of the first radiator in the first antenna does not need to be grounded through a connector, so that the antenna assembly has fewer components and is more convenient for the layout of the antenna assembly in the electronic device. Further, the second antenna is electrically connected to the first radiator and is grounded through the first matching circuit, so that the second radiator and the first radiator can be used when the second antenna is working, further improving the antenna performance of the antenna assembly in the NFC frequency band. Specifically, the NFC excitation signal of the second feed source can excite the first radiator and the second radiator to jointly support the NFC frequency band. It can be seen that the antenna assembly can reuse the first radiator in the first antenna to support the NFC frequency band. When the size of the second radiator is constant, the first radiator also supports the NFC frequency band, so that the size of the radiator supporting the NFC frequency band in the antenna assembly can be increased, and the area of ​​the NFC radiator can be expanded, so that the antenna assembly can communicate with other NFC antennas with higher efficiency, and the NFC performance in some scenarios can be improved, so that the antenna assembly is more conducive to wide application in electronics. As can be seen from the above description, the second radiator is relatively large and has a relatively high cost when it includes a stacked coil and ferrite. Therefore, when the size of the radiator required to support the NFC frequency band is constant, the first radiator also supports the NFC frequency band, which can reduce the area of ​​the second radiator, thereby making the size of the antenna assembly smaller and the cost lower.

[0008] In addition, the orthographic projection of the first 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 current of the floor, so that the antenna assembly has a higher radiation efficiency in the first frequency band. Therefore, the electronic device has better communication performance. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0010] Figure 1 is a schematic diagram of an antenna assembly in the related art;

[0011] Figure 2 A schematic diagram of an antenna assembly provided in one embodiment of the present application;

[0012] Figure 3 A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0013] Figure 4 This is an implementation method of the present application Figure 3 A schematic diagram of an antenna assembly provided in;

[0014] Figure 5 Another embodiment of this application Figure 3 A schematic diagram of an antenna assembly provided in;

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

[0016] Figure 7 for Figure 6 A side view of a portion of the structure of an antenna assembly provided in;

[0017] Figure 8 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;

[0018] Fig. 9 for Figure 8 A schematic diagram of a current weak point area and a current strong point area in a floor of a circuit board shown;

[0019] Fig.10 for Figure 6 A schematic diagram of an orthographic projection of a first feed point on a floor in an antenna assembly provided in;

[0020] Fig.11 is a schematic diagram of an orthographic projection of a first feeding point in an antenna assembly on a floor in another embodiment;

[0021] Fig.12 A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0022] Fig.13 Schematic diagram of replacing the radiator with an inductive device;

[0023] Fig.14 A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0024] Fig.15 A schematic diagram of an antenna assembly provided in yet another embodiment of the present application;

[0025] Fig.16 A schematic diagram of an antenna assembly provided in yet another embodiment of the present application;

[0026] Fig.17 This is an implementation method of the present application Fig.16 A schematic diagram of an antenna assembly provided in;

[0027] Fig.18 Another embodiment of this application Fig.16A schematic diagram of an antenna assembly provided in;

[0028] Fig.19 A schematic diagram of an antenna assembly provided in another embodiment of the present application;

[0029] Fig. 20 for Fig.19 A schematic diagram of an orthographic projection of a second feed point on a floor in an antenna assembly provided in;

[0030] Fig.21 A schematic diagram showing the efficiency comparison between the antenna assembly provided in the embodiment of the present application and the cellular antenna in the related art;

[0031] Fig. 22 A three-dimensional schematic diagram of an electronic device provided in one embodiment;

[0032] Fig.23 for Fig. 22 Schematic diagram of the labels of some parts in the figure.

[0033] Description of main component numbers:

[0034] Electronic device 1, back surface 1a, side surface 1b, antenna assembly 10, display screen 30, middle frame 50, battery cover 70;

[0035] Circuit board 110, floor 111, first side 1111, second side 1112, current weak point area 110a, current strong point area 110b;

[0036] A first antenna 130, an inductive device 140, a second antenna 150, and a third antenna 170;

[0037] A first radiator 131, a first feed source S1, a first matching circuit M1, a first isolation circuit 132, a first end 1311, a second end 1312, a first feeding point P1, a first inductor L1, and a first capacitor C1;

[0038] A second radiator 151, a second feed source S2, a third end 1511, a fourth end 1512, a first radiating portion 151a, a second radiating portion 151b, and a third radiating portion 151c;

[0039] The third radiator 171, the third feed source S3, the second matching circuit M2, the second isolation circuit 172, the fifth end 1711, the sixth end 1712, the second feeding point P2, the second inductor L2, and the second capacitor C2. DETAILED DESCRIPTION

[0040] 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.

[0041] In order to conveniently explain the beneficial effects of the antenna assembly 10 provided in the embodiment of the present application, the antenna assembly 10 provided in the related art (not the prior art) is briefly introduced first. Figure 1 , Figure 1 Schematic diagram of an antenna assembly in the related art. In the related art, the antenna assembly 10 includes a first antenna 130 and a second antenna 150. The first antenna 130 is a cellular antenna, and the second antenna 150 is an NFC antenna. The first antenna 130 includes a first radiator 131, a first matching circuit M1, and a first feed source S1. The first radiator 131 includes a first end 1311 and a second end 1312, and the first end 1311 has a feed point P. The first matching circuit M1 is electrically connected to the feed point P, and the first feed source S1 is electrically connected to the feed point P. The second end 1312 is electrically connected to the ground.

[0042] The second antenna 150 includes a second radiator 151 and a second feed source S2. One end of the second radiator 151 is electrically connected to the second feed source S2, and the other end of the second radiator 151 is electrically connected to the first feed point PP1 of the feed point P. However, there are many devices (such as matching devices, switching switches, etc.) at the position of the feed point P in the first antenna 130. Therefore, when the second antenna 150 is electrically connected to the feed point P of the first radiator 131, the layout is more difficult. In addition, the second end 1312 of the first radiator 131 of the first antenna 130 is electrically connected to the ground, and when the second end 1312 is electrically connected to the ground, it can be electrically connected to the ground through a connector such as a spring. It can be seen that it also occupies more space. In summary, the layout of the antenna assembly 10 in the related art in the electronic device 1 is more difficult.

[0043] See also Figure 2 , Figure 6 , Figure 7 and Fig. 22 , Figure 2 A schematic diagram of an antenna assembly provided in one embodiment of the present application; Figure 6A schematic diagram of an antenna assembly provided in another embodiment of the present application; Figure 7 for Figure 6 . The electronic device 1 includes an antenna assembly 10. The antenna assembly 10 includes a first antenna 130 and a second antenna 150. The first antenna 130 includes a floor 111, a first radiator 131, a first feed source S1 and a first matching circuit M1. The first radiator 131 includes a first end 1311 and a second end 1312. The first end 1311 has a first feeding point P1, and the orthographic projection of the first feeding point P1 on the floor 111 is located in the current weak point area 110a of the characteristic mode of the floor. The first feed source S1 is used to generate a first excitation signal, and the first feed source S1 is electrically connected to the first feeding point P1 to excite the floor 111 to support a first frequency band through the first radiator 131. The first matching circuit M1 is arranged adjacent to the first end 1311, and one end of the first matching circuit M1 is electrically connected to the first feeding point P1, the other end is grounded, and the second end 1312 is a free end. The second antenna 150 includes a second radiator 151 and a second feed source S2. The second feed source S2 is electrically connected to the second radiator 151, and the second antenna 150 is also electrically connected to the second end 1312. The second feed source S2 is used to generate an NFC excitation signal to excite the first radiator 131 and the second radiator 151 to jointly support the NFC frequency band.

[0044] In this embodiment, the first antenna 130 is described as a cellular antenna, which is understandable and should not be considered as limiting the embodiment of the present application. The floor 111 can be the ground of the circuit board 110 in the electronic device 1, or the ground of the main board, or the ground of the circuit board and the ground of the main board. In this embodiment, the floor 111 is described as the ground of the circuit board 110.

[0045] The floor 111 in the circuit board 110 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 110 usually constitutes the floor 111, also referred to as a ground electrode. It is understandable that the circuit board 110 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 disposed between adjacent insulating layers, and the wiring layer and the floor are disposed 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 110 herein is only one case of the circuit board 110, and should not be understood as a limitation on the circuit board 110 or the floor 111 provided in the embodiments of the present application.

[0046] The first radiator 131 may be a laser direct structuring (LDS) radiator, or a flexible printed circuit 110 (FPC) radiator, or a print direct structuring (PDS) first radiator 131, or a metal branch radiator. When the antenna assembly 10 is applied to an electronic device 1, the first radiator 131 may be a mechanical design antenna (MDA) first radiator 131 designed using the metal insert of the electronic device 1 itself. For example, the first radiator 131 may be an antenna first radiator 131 designed using the middle frame formed of plastic and metal of the electronic device 1. In addition, the first radiator 131 may also be a first radiator 131 of a metal frame antenna designed using a metal middle frame.

[0047] It is understandable that the present application does not specifically limit the shape, structure and material of the first radiator 131, and the shapes of the first radiator 131 include but are not limited to bent, straight, L-shaped, sheet-shaped, rod-shaped, coated, thin film, etc. When the first radiator 131 is in a strip shape, the present application does not limit the extension track of the first radiator 131, so the first radiator 131 can be extended in a straight line, a curve, a multi-stage bend, etc. The first radiator 131 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.

[0048] In one embodiment, the floor 111 and the first radiator 131 together form a dipole antenna, the floor 111 is a radiating arm of the dipole antenna, named as the first radiating arm; the first radiator 131 is another radiating arm of the dipole antenna, named as the second radiating arm. When the first antenna 130 is working, the floor 111 and the first radiator 131 both participate in the work.

[0049] In this embodiment, the first radiator 131 is spaced apart from the floor 111. Therefore, under the excitation of the first feed source S1, the first radiator 131 acts as a radiation driving device to form a capacitive coupling element (CCE). The size of CCE is relatively small and easy to implement. Therefore, CCE feeding is adopted in this case.

[0050] The first end 1311 has a first feeding point P1, so the first end 1311 is the feeding end of the first radiator 131. The second end 1312 is the free end of the first radiator 131, or is called the end. The first matching circuit M1 is the matching of the first antenna 130 itself. In one embodiment, the first matching circuit M1 is used to adjust the resonant frequency of the first frequency band supported by the first antenna 130. Or, in other embodiments, the first matching circuit M1 is used to match the output impedance of the first feed source S1 with the input impedance of the first radiator 131, so that the first antenna 130 has a higher radiation efficiency in the first frequency band. In one embodiment, the first matching circuit M1 may include one or more matching devices, and the matching device may include one or more of a capacitor, an inductor, a series combination of a capacitor and an inductor, or a parallel combination of a capacitor and an inductor. In another embodiment, the matching device may include one or more matching devices and one or more switching switches, and the one or more switching switches are electrically connected to the one or more matching devices. By controlling the one or more switching switches, the matching components electrically connected to the first radiator 131 can be adjusted to be different, thereby making the first frequency band supported by the first antenna 130 antenna assembly 10 different. Alternatively, by controlling the one or more switching switches, the matching components electrically connected to the first radiator 131 can be adjusted to be different, thereby making the radiation efficiency of the first frequency band supported by the first antenna 130 different. By selecting appropriate switching switches and matching components, the radiation efficiency of the first frequency band supported by the first antenna 130 can be higher.

[0051] The second antenna 150 is a near field communication (NFC) antenna, which can be used for swiping bus cards, subway cards, access control, elevators and other scenarios. In an embodiment of the present application, the second antenna 150 can be a non-coil NFC antenna, and the second antenna 150 can be an ordinary flexible printed circuit radiator (Flexible Printed Circuit, FPC). In other embodiments, the second antenna 150 is an NFC antenna, and the second radiator 151 generally includes a stacked coil and a ferrite. The coil is arranged on the ferrite. The coil can be, but is not limited to, a coil prepared for a flexible printed circuit (Flexible Printed Circuit, FPC). Generally speaking, the volume of the second radiator 151 including the coil is relatively large and the cost is relatively high. It can be understood that the present application does not limit the structural form of the second radiator 151, and the above examples should not be understood as limitations on the embodiments of the present application.

[0052] The second feed source S2 may generate an NFC excitation signal. In one embodiment, the second feed source S2 may be located in an integrated circuit chip (IC) formed by an integrated circuit chip. The integrated circuit chip may be disposed on the circuit board 110 .

[0053] In this embodiment, the second antenna 150 is also electrically connected to the second end 1312. Specifically, it will be described later in combination with various embodiments. The NFC excitation signal excited by the second feed source S2 can excite the first radiator 131 and the second radiator 151 to jointly support the NFC frequency band. It can be seen that the antenna assembly 10 can not only support the NFC frequency band by using the second radiator 151, but also reuse the first radiator 131 in the first antenna 130 to support the NFC frequency band. When the size of the second radiator 151 is constant, the first radiator 131 also supports the NFC frequency band, so that the size of the radiator supporting the NFC frequency band in the antenna assembly 10 can be increased, and the area of ​​the NFC radiator can be expanded, so that the antenna assembly 10 can communicate with other NFC antennas with higher efficiency, and the NFC performance in some scenarios can be improved, so that the antenna assembly 10 is more conducive to wide application in electronics. As can be seen from the previous introduction, the volume of the second radiator 151 when it includes a stacked coil and ferrite is relatively large and the cost is relatively high. Therefore, when the size of the radiator required to support the NFC frequency band is certain, the first radiator 131 also supports the NFC frequency band, which can reduce the area of ​​the second radiator 151, thereby making the size of the antenna assembly 10 smaller and the cost lower.

[0054] In summary, in the antenna assembly 10 provided in the embodiment of the present application, the first matching circuit M1 of the first antenna 130 is arranged adjacent to the first end 1311 and electrically connected to the first feeding point P1, but not adjacent to the second end 1312 of the first radiator 131 which is a free end. The second antenna 150 is electrically connected to the second end 1312 of the first radiator 131 which is a free end of the first antenna 130, but not electrically connected to the first feeding point P1 of the first radiator 131. Therefore, when the second antenna 150 is electrically connected to the first radiator 131, the phenomenon that the layout is more difficult when the second antenna 150 is electrically connected to the first feeding point P1 of the first radiator 131 in the related art is avoided. In other words, in the antenna assembly 10 provided in the embodiment of the present application, the second antenna 150 is electrically connected to the free end of the first radiator 131, which is relatively simple and convenient, and it is convenient to layout the antenna assembly 10 in the electronic device 1. In addition, since the other end of the first matching circuit M1 in the first antenna 130 is grounded, the second end 1312 of the first radiator 131 in the first antenna 130 does not need to be grounded through a connector, so that the antenna assembly 10 has fewer components and is more convenient for the layout of the antenna assembly 10 in the electronic device 1. Furthermore, the second antenna 150 is electrically connected to the first radiator 131 and is grounded through the first matching circuit M1, so that the second antenna 150 can use the second radiator 151 and the first radiator 131 when working, further improving the antenna performance of the antenna assembly 10 in the NFC frequency band. Specifically, the NFC excitation signal of the second feed source S2 can excite the first radiator 131 and the second radiator 151 to jointly support the NFC frequency band. It can be seen that the antenna assembly 10 can reuse the first radiator 131 in the first antenna 130 to support the NFC frequency band. When the size of the second radiator 151 is constant, the first radiator 131 also supports the NFC frequency band, so that the size of the radiator supporting the NFC frequency band in the antenna assembly 10 can be increased, and the area of ​​the NFC radiator can be expanded, so that the antenna assembly 10 can communicate with other NFC antennas with higher efficiency, and the NFC performance in some scenarios can be improved, making the antenna assembly 10 more conducive to wide application in electronics. As can be seen from the previous introduction, the volume of the second radiator 151 including the stacked coil and ferrite is relatively large and the cost is relatively high. Therefore, when the size of the radiator supporting the NFC frequency band required as a whole is constant, the first radiator 131 also supports the NFC frequency band, which can reduce the area of ​​the second radiator 151, thereby making the size of the antenna assembly 10 smaller and the cost lower.

[0055] In addition, in the electronic device 1 provided in the embodiment of the present application, in the antenna assembly 10, the positive projection of the first feeding point P1 on the floor 111 is located in the current weak point area 110a of the characteristic mode of the floor, which can well excite the current of the floor 111, so that the antenna assembly 10 has a higher radiation efficiency in the first frequency band. It can be seen that the antenna assembly 10 has a higher communication performance in the first frequency band. In addition, in the antenna assembly 10, the floor 111 constitutes the main radiation branch of the first frequency band, contributing most of the radiation of the antenna assembly 10 in the first antenna 130, and the first radiator 131 acts as the radiation driving device of the first antenna 130, which becomes the excitation condition of the floor 111 working in the first frequency band. The energy of the first radiator 131 accounts for a small proportion, so in this case, when the size of the first radiator 131 is reduced, the radiation performance of the antenna assembly 10 in the first antenna 130 is less affected. In addition, when the size of the first radiator 131 is reduced, it is conducive to the miniaturization of the antenna assembly 10.

[0056] Next, the electrical connection of the second antenna 150 to the second end 1312 is described in conjunction with the specific structure of the second antenna 150. Figure 2 In the antenna assembly 10 shown in this embodiment, the second radiator 151 includes a third end 1511 and a fourth end 1512. The third end 1511 is electrically connected to the second feed source S2, and the fourth end 1512 is electrically connected to the second end 1312.

[0057] In the schematic diagram of this embodiment, the third end 1511 is located at the left end of the illustrated viewing angle, and the fourth end 1512 is located at the right end of the illustrated viewing angle. It can be understood that this should not be construed as a limitation on the embodiments of the present application. In other embodiments, the positions of the third end 1511 and the fourth end 1512 can also be adjusted. In addition, the shape of the second radiator 151 shown in the schematic diagram of this embodiment should not be construed as a limitation on the embodiments of the present application.

[0058] In this embodiment, the third end 1511 is electrically connected to the second feed source S2, and the fourth end 1512 is electrically connected to the second end 1312. It can be seen that one port of the second antenna 150 (here the fourth end 1512) is electrically connected to other antennas (here the first antenna 130). Therefore, the antenna assembly 10 provided in this embodiment is also called a single-port solution.

[0059] In this embodiment, the NFC excitation signal generated by the second feed source S2 can be transmitted to the fourth end 1512 of the second radiator 151 via the third end 1511 of the second radiator 151. Since the fourth end 1512 of the second radiator 151 is electrically connected to the second end 1312 of the first radiator 131, the NFC excitation signal can be transmitted to the second end 1312 of the first radiator 131 via the fourth end 1512 of the second radiator 151, and transmitted to the first end 1311 of the first radiator 131 via the second end 1312 of the first radiator 131, and transmitted to the ground via the feeding point and the first matching circuit M1. It can be seen that the NFC excitation signal can support the NFC frequency band using the second radiator 151 and the first radiator 131. It can be seen that the embodiment of the present application provides an antenna assembly 10, which can reuse the first radiator 131 in the first antenna 130 to support the NFC frequency band. When the size of the second radiator 151 is constant, the first radiator 131 also supports the NFC frequency band, so that the size of the radiator supporting the NFC frequency band in the antenna assembly 10 can be increased, and the area of ​​the NFC radiator can be expanded, so that the antenna assembly 10 can communicate with other NFC antennas with higher efficiency, and the NFC performance in some scenarios can be improved, making the antenna assembly 10 more conducive to wide application in electronics. As can be seen from the previous introduction, the volume of the second radiator 151 including the stacked coil and ferrite is relatively large and the cost is relatively high. Therefore, when the size of the radiator supporting the NFC frequency band required as a whole is constant, the first radiator 131 also supports the NFC frequency band, which can reduce the area of ​​the second radiator 151, thereby making the size of the antenna assembly 10 smaller and the cost lower.

[0060] For further information, see Figure 3 , Figure 3 Schematic diagram of an antenna assembly provided in another embodiment of the present application. In this embodiment, the first antenna 130 further includes a first isolation circuit 132. The second feed source S2 is electrically connected to the first isolation circuit 132 to the second end 1312, and the first isolation circuit 132 is used to isolate the signal of the first frequency band from the signal of the NFC frequency band.

[0061] The first isolation circuit 132 is used to isolate the signal of the first frequency band from the signal of the NFC frequency band. Specifically, the first isolation circuit 132 can reduce or even avoid the influence of the second antenna 150 on the first antenna 130, so as to reduce or even avoid the influence of the NFC frequency band on the first frequency band, so that the antenna assembly 10 can not only work in the first frequency band and the NFC frequency band, but also has good communication performance in the NFC frequency band and the first frequency band.

[0062] Specifically, the setting of the first isolation circuit 132 has no effect or almost no effect on the second antenna 150. The first isolation circuit 132 can block the end (second end 1312) of the first radiator 131 of the first antenna 130, and does not change the radiation structure of the end of the first radiator 131. In other words, the first isolation circuit 132 is equivalent to an open circuit for the first radiator 131 of the first antenna 130, and when the first antenna 130 works in the first frequency band, the second end 1312 needs to be open. Therefore, the first antenna 130 also includes the first isolation circuit 132, which can reduce or even avoid the influence of the NFC frequency band on the first frequency band, and does not change the radiation structure of the end of the first radiator 131.

[0063] Please also read Figure 3 and Figure 4 , Figure 4 This is an implementation method of the present application Figure 3 The first isolation circuit 132 includes a first inductor L1 , one end of the first inductor L1 is electrically connected to the second end 1312 , and the other end of the first inductor L1 is connected to the fourth end 1512 .

[0064] The first inductor L1 satisfies at least one of the following conditions: a single inductor; a plurality of inductors connected in series; a plurality of inductors connected in parallel, etc., which are not limited here.

[0065] In the antenna assembly 10 provided in the embodiment of the present application, the first isolation circuit 132 includes a first inductor L1, and the first inductor L1 is equivalent to an open circuit for the first radiator 131 of the first antenna 130. When the first antenna 130 operates in the first frequency band, the second end 1312 needs to be open circuited. Therefore, the first isolation circuit 132 includes the first inductor L1, which can reduce or even avoid the influence of the NFC frequency band on the first frequency band, and does not change the radiation structure of the end of the first radiator 131. The first isolation circuit 132 includes the first inductor L1, and the structure of the first isolation circuit 132 is simple and easy, and thus can reduce or even avoid the influence of the second antenna 150 on the first antenna 130, so as to reduce or even avoid the influence of the NFC frequency band on the first frequency band, so that the antenna assembly 10 can not only operate in the first frequency band and the NFC frequency band, but also has good communication performance in the NFC frequency band and the first frequency band.

[0066] In one implementation, the inductance value of the first inductor L1 ranges from 40 nH to 80 nH.

[0067] The inductance value of the first inductor L1 may be, but is not limited to, 40nH, 45nH, 50nH, 55nH, 60nH, 65nH, 70nH, 75nH, or 80nH, and may also be other values ​​other than the above examples as long as they meet the range of 40nH to 80nH.

[0068] Generally speaking, the larger the inductance value of the first inductor L1 is, the more similar it is to an open circuit, and the smaller the adverse effect on the first antenna 130 is. However, the larger the inductance value of the first inductor L1 is, the larger the volume of the first inductor L1 is, which is not conducive to the layout of the antenna assembly 10 in the electronic device 1; accordingly, the smaller the inductance value of the first inductor L1 is, the greater the adverse effect on the first antenna 130 is. In the antenna assembly 10 provided in the embodiment of the present application, the inductance value of the first inductor L1 is selected in the range of 40nH to 80nH, which can reduce or even avoid the influence of the second antenna 150 on the first antenna 130, so as to reduce or even avoid the influence of the NFC frequency band on the first frequency band, so that the antenna assembly 10 can not only work in the first frequency band and the NFC frequency band, but also has good communication performance in the NFC frequency band and the first frequency band. In addition, the volume of the first inductor L1 can also be taken into account, so that the volume of the first inductor L1 is not too large, which is conducive to the layout of the antenna assembly 10 in the electronic device 1.

[0069] Please also read Figure 3 and Figure 5 , Figure 5 Another embodiment of this application Figure 3In this embodiment, the first isolation circuit 132 includes a first inductor L1, one end of the first inductor L1 is electrically connected to the second end 1312, and the other end of the first inductor L1 is connected to the fourth end 1512.

[0070] In addition, the first isolation circuit 132 further includes a first capacitor C1. One end of the first capacitor C1 is electrically connected to the other end of the first inductor L1, and the other end of the first capacitor C1 is electrically connected to the ground.

[0071] Please refer to the previous description for the first inductor L1, which will not be repeated here. The first isolation circuit 132 also includes a first capacitor C1. The electrical connection method of the first capacitor C1 in the embodiment of the present application can improve the antenna performance of the first antenna 130. Specifically, the first capacitor C1 can reduce or even avoid the influence of the second antenna 150 on the first antenna 130, so as to reduce or even avoid the influence of the NFC frequency band on the first frequency band, so that the antenna assembly 10 can not only operate in the first frequency band and the NFC frequency band, but also has better communication performance in the NFC frequency band and the first frequency band. In one embodiment, the capacitance value of the first capacitor C1 is greater than 33pF.

[0072] See also Figure 6 , Figure 6 Schematic diagram of an antenna assembly provided in another embodiment of the present application. The antenna assembly 10 further includes a floor 111 , and the orthographic projection of the first feeding point P1 on the floor 111 is located in a current weak point region 110 a of a characteristic mode current of the floor 111 .

[0073] In this embodiment, the floor 111 is taken as an example of the ground in the circuit board 110. The floor 111 in the circuit board 110 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 110 usually constitutes the floor 111, also referred to as a ground electrode. It is understandable that the circuit board 110 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 can be electrically connected through wires or metal through holes. It is understandable that the introduction of the circuit board 110 here is only one case of the circuit board 110, and should not be understood as a limitation on the circuit board 110 provided in the embodiment of the present application.

[0074] It can be understood that the floor 111 shown in this embodiment is the floor in the circuit board 110, which should not be understood as a limitation on the embodiments of the present application. In other embodiments, the floor 111 can also be the ground of the main board, or the ground of the circuit board and the ground of the main board.

[0075] In this embodiment, the circuit board 110 is a main board. The characteristic mode is an inherent mode that characterizes the floor 111 of the circuit board 110. By analyzing the characteristic mode (also called characteristic mode) of the circuit board 110, the most suitable feeding position can be found according to the boundary conditions. The following is an example of the first frequency band supported by the first antenna 130 in the antenna assembly 10 being a low frequency band. The characteristic current with the largest proportion of the longitudinal current mode can be obtained by simulation. Please refer to Figure 8 and Fig. 9 , Figure 8 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; Fig. 9 for Figure 8 The current distribution of the characteristic mode is mainly characterized by the sinusoidal behavior of the edge of the circuit board 110, which is represented by Figure 8 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 110, can also be considered. The difference between the phase of the electric field distribution in the circuit board 110 and the phase of the current distribution is 90°. That is, the minimum value of the electric field distribution in the circuit board 110 is the same as the maximum value of the current distribution in the circuit board 110; conversely, the maximum value of the electric field distribution in the circuit board 110 is the same as the minimum value of the current distribution in the circuit board 110. Figure 8 In the figure, the curve J next to the circuit board 110 is used to represent the current distribution of the circuit board 110, and the curve V is used to represent the voltage distribution of the floor 111 of the circuit board 110. Curve J shows that the current distribution of the floor 111 of the circuit board 110 is a sine distribution. It can be seen from curve J that the two ends of the floor 111 of the circuit board 110 are the places where the current is the smallest, and the middle position of the floor 111 of the circuit board 110 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 110 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 110 (that is, the minimum electric field distribution of the circuit board 110) 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 110 (that is, the maximum electric field distribution of the circuit board 110) to excite the characteristic mode. Please refer to Fig. 9 ,exist Fig. 9 In the figure, there is a current weak point area 110a of the characteristic mode current of the floor 111 in the circuit board 110, and a current strong point area 110b of the characteristic mode current of the floor 111 in the circuit board 110. 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 10 is to obtain higher radiation efficiency, it is necessary to better excite the longitudinal current distribution of the floor 111 on the circuit board 110. 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 current weak point area 110a of the characteristic mode of the floor 111 can also be used. 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 .

[0076] In the antenna assembly 10 provided in the embodiment of the present application, the orthographic projection of the first feeding point P1 on the floor 111 is located in the current weak point area 110a of the characteristic mode current of the floor 111, the floor 111 of the circuit board 110 constitutes the main radiation branch of the first frequency band, and contributes most of the radiation of the antenna assembly 10, while the first radiator 131 is equivalent to acting as a radiation driving device for the entire antenna assembly 10, and becomes the excitation condition for the floor 111 of the circuit board 110 to work in the first frequency band, and the energy of the first radiator 131 accounts for a very small proportion. Therefore, in this case, reducing the size of the first radiator 131 has little effect on the overall radiation performance of the antenna assembly 10.

[0077] Please also read Fig.10 and Fig.11 , Fig.10 for Figure 6 A schematic diagram of an orthographic projection of a first feed point on a floor in an antenna assembly provided in; Fig.11Schematic diagram of the orthographic projection of the first feeding point in the antenna assembly on the floor in another embodiment. The floor 111 includes a first side 1111 and a second side 1112 connected by a bend, the length of the first side 1111 is greater than the length of the second side 1112, wherein the current weak point area 110a where the orthographic projection of the first feeding point P1 on the floor 111 is located 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 O1 and the radius R1 of 1 / 16 of the wavelength of the first frequency band.

[0078] The current weak point area 110a where the orthographic projection of the first feeding point P1 on the floor 111 is located 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 O1 and the radius R of 1 / 16 of the wavelength of the first frequency band.

[0079] 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 of the circle is the intersection of the extension line of the first side 1111 and the extension line of the second side 1112, and the center of the circle 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.

[0080] The orthographic projection of the first feeding point P on the floor 111 is located in the current weak point area 110a and in a circular area with the intersection O1 as the center and 1 / 16 of the wavelength of the first frequency band as the radius. It can be seen that the area where the first feeding point P1 is set is fan-shaped or fan-like.

[0081] When the current weak point area 110a is selected as 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 and 1 / 16 of the wavelength of the first frequency band as the radius, the current in the area is relatively weak. The orthographic projection of the first feeding point P1 on the floor 111 is located in the area, which can further better excite the excitation current in the same extension direction of the first side 1111, so that the antenna assembly 10 has a higher radiation efficiency in the first frequency band.

[0082] Please read further Fig. 9The 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 orthographic projection of the first feeding point P1 on the floor 111 is located in any one of the four current weak point areas 110a, and the first radiator 131 is adjacent to the current weak point area 110a disposed in the first feeding point P1.

[0083] In this embodiment, the number of the current weak area 110a is four, and the orthographic projection of the first feeding point P1 on the floor 111 is located in any one of the four current weak area 110a, which makes the setting of the first feeding point P1 more flexible. The first radiator 131 is arranged adjacent to the current weak area 110a where the first feeding point P1 is arranged. For the convenience of description, the current weak areas 110a are named as current weak area 110a(1), current weak area 110a(2), current weak area 110a(3) and current weak area 110a(4). In this embodiment, the orthographic projection of the first feeding point P1 on the floor 111 is located in the current weak area 110a(2) as an example for illustration. Accordingly, the first radiator 131 is arranged adjacent to the current weak area 110a(2).

[0084] See also Fig.12 and Fig.13 , Fig.12 A schematic diagram of an antenna assembly provided in another embodiment of the present application; Fig.13 This is a schematic diagram of replacing the radiator with an inductive device. Fig.13 (a) is a schematic diagram of an antenna assembly 10 without an inductive device; Fig.13 (b) is a schematic diagram of an antenna assembly 10 provided with an inductive device. The antenna assembly 10 includes an inductive device 140. One end of the inductive device 140 is electrically connected to the first feed source S1, and the other end of the inductive device 140 is electrically connected to the first feed point P1. Fig.13 visible, Fig.13 In (b), the length of the first radiator 131 of the antenna assembly 10 including the inductive device 140 is relatively small.

[0085] In this embodiment, one end of the inductive device 140 in the antenna assembly 10 is electrically connected to the first feed source S1, and the other end is electrically connected to the first feeding point P1, which is equivalent to the first feed source S1 connecting the inductive device 140 in series to the first feeding point P1 of the first radiator 131.

[0086] It should be noted that the so-called inductive device 140 refers to a device that exhibits inductive characteristics within the first frequency band supported by the antenna assembly 10. The inductive device 140 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 140 exhibits inductive characteristics within the first frequency band supported by the antenna assembly 10.

[0087] Due to the antenna assembly 10 provided in the embodiment of the present application, the orthographic projection of the first feeding point P1 on the floor 111 is located in the current weak point area 110a of the characteristic mode current of the floor 111, which can better excite the excitation current in the same extension direction along the first side 1111. The floor 111 of the circuit board 110 constitutes the main radiation branch of the first frequency band and contributes most of the radiation of the antenna assembly 10, while the first radiator 131 is equivalent to acting as a radiation driving device for the entire antenna assembly 10, and becomes the excitation condition for the floor 111 of the circuit board 110 to work in the first frequency band. The energy proportion of the first radiator 131 is very small. Therefore, in this case, reducing the size of the first radiator 131 has little effect on the overall radiation performance of the antenna assembly 10. Fig.13 It can also be seen that the size of the first radiator 131 in the antenna assembly 10 provided with the inductive device 140 is relatively small.

[0088] The inductive device 140 can compensate for the insufficiency of the inductance caused by the miniaturization of the first radiator 131 , so that the antenna assembly 10 has better antenna performance in the first frequency band, and the antenna assembly 10 works better in the first frequency band.

[0089] The electrical length of the first radiator 131 is satisfy: Wherein, λ is the wavelength of the electromagnetic wave signal in the first frequency band.

[0090] The length of the first radiator 131 refers to the size of the extension path between the first end 1311 and the second end 1312. Considering the need for miniaturization of the first radiator 131, the electrical length of the first radiator 131 is Select less than or equal to At the same time, considering that the physical length of the induction device 130 replacing the first radiator 131 is too large, it will introduce more energy loss. Therefore, the electrical length of the first radiator 131 is selected as In summary, the electrical length of the first radiator 131 provided in the embodiment of the present application is satisfy: On the one hand, the size of the first radiator 131 can be made smaller, and on the other hand, the antenna assembly 10 can have smaller energy loss when supporting the first frequency band.

[0091] It should be noted that the electrical length of the first radiator 131 satisfies the following formula:

[0092] Wherein, L is the physical length of the first radiator 131, a is the transmission time of the electromagnetic wave signal of the first frequency band in the first radiator 131, and b is the transmission time of the electromagnetic wave signal of the first frequency band in free space.

[0093] See also Fig.14 , Fig.14 A schematic diagram of an antenna assembly provided in another embodiment of the present application. The antenna assembly 10 includes a first antenna 130 and a second antenna 150. The first antenna 130 includes a first radiator 131, a first feed source S1 and a first matching circuit M1. The first radiator 131 includes a first end 1311 and a second end 1312. The first end 1311 has a first feeding point P1, and the first feed source S1 is electrically connected to the first feeding point P1, and is used to generate a first excitation signal to excite the first radiator 131 to support a first frequency band. The first matching circuit M1 is arranged adjacent to the first end 1311, and one end of the first matching circuit M1 is electrically connected to the first feeding point P1, and the other end is grounded, and the second end 1312 is a free end. The second antenna 150 includes a second radiator 151 and a second feed source S2. The second feed source S2 is electrically connected to the second radiator 151, and the second antenna 150 is also electrically connected to the second end 1312.

[0094] Further, in this embodiment, the second radiator 151 includes a third end 1511 and a fourth end 1512. The second feed source S2 is electrically connected to the fourth end 1512, and the second feed source S2 is also electrically connected to the second end 1312 of the first radiator 131. The antenna assembly 10 also includes a third antenna 170. The third antenna 170 includes a third radiator 171 and a third feed source S3. The third radiator 171 includes a fifth end 1711 and a sixth end 1712. The fifth end 1711 has a second feeding point P2, and the third feed source S3 is electrically connected to the second feeding point P2, and is used to generate a second excitation signal to excite the third radiator 171 to support the third frequency band, and the sixth end 1712 is grounded. Among them, the third end 1511 is also electrically connected to the second feeding point P2, and the NFC excitation signal is used to excite the first radiator 131, the second radiator 151 and the third radiator 171 to jointly support the NFC frequency band.

[0095] It is understandable that the antenna assembly 10 in the schematic diagram of the embodiment of the present application also includes the third antenna 170 combined with the schematic diagram of the previous embodiment. In other words, in the schematic diagram of the present embodiment, the antenna assembly 10 also includes the third antenna 170 combined with the second antenna 150 and also includes the first isolation circuit 132, and the first isolation circuit 132 includes the first inductor L1 and the first capacitor C1 as an example for illustration. Please refer to the previous description for the first isolation circuit 132, which will not be repeated here. It is understandable that in other embodiments, the second antenna 150 may not include the first isolation circuit 132; or, in other embodiments, the first isolation circuit 132 includes the first inductor L1 but not the first capacitor C1.

[0096] In this embodiment, the third antenna 170 is taken as an example of a cellular antenna, which is understandable and should not be understood as a limitation on the embodiments of the present application. The third radiator 171 can be a laser direct structuring (LDS) radiator, or a flexible printed circuit 110 (FPC) radiator, or a print direct structuring (PDS) third radiator 171, or a metal branch radiator. When the antenna assembly 10 is applied to an electronic device 1, the third radiator 171 can be a structural antenna (Mechanical Design Antenna, MDA) third radiator 171 designed using the metal of the electronic device 1 itself. For example, the third radiator 171 can be an antenna third radiator 171 designed using the middle frame 50 formed of plastic and metal of the electronic device 1. In addition, the third radiator 171 can also be a metal frame antenna third radiator 171 designed for a metal middle frame 50.

[0097] It is understandable that the present application does not specifically limit the shape, structure and material of the third radiator 171, and the shapes of the third radiator 171 include but are not limited to bent, straight, L-shaped, sheet-shaped, rod-shaped, coated, thin film, etc. When the third radiator 171 is in a strip shape, the present application does not limit the extension track of the third radiator 171, so the third radiator 171 can be extended in a straight line, a curve, a multi-stage bend, etc. The third radiator 171 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.

[0098] In one embodiment, the third antenna 170 further includes a matching circuit, which is named as a second matching circuit for the convenience of description. The second matching circuit of the third antenna 170 is electrically connected to the second feeding point P2. The second matching circuit of the third antenna 170 is used to adjust the resonant frequency of the third frequency band supported by the third antenna 170. Alternatively, in other embodiments, the second matching circuit M2 is used to match the output impedance of the third feed source S3 with the input impedance of the third radiator 171, so that the third antenna 170 has a higher radiation efficiency in the third frequency band.

[0099] In one embodiment, the first antenna 130 is a cellular antenna, and the third antenna 170 is also a cellular antenna. The third frequency band may be the same as or different from the first frequency band. When the third frequency band is different from the first frequency band, the third frequency band and the first frequency band may both support different working frequency bands in the same frequency band, wherein the same frequency band includes multiple different working frequency bands. For example, the low frequency band includes multiple different working frequency bands. For example, the working frequency band of the low frequency band is the B8 band, the B20 band, and the like. It can be understood that when one of the first frequency band and the second frequency band supports low frequency, and the other of the first frequency band and the second frequency band is medium frequency, then the first frequency band and the second frequency band may also be considered different. In one embodiment, the first frequency band is low frequency, the second frequency band is the NFC band, and the third frequency band is low frequency.

[0100] In this embodiment, the second feed source S2 is also electrically connected to the second end 1312 of the first radiator 131, and the third end 1511 is also electrically connected to the second feeding point P2. It can be seen that the second antenna 150 is electrically connected to the first antenna 130 and the third antenna 170 respectively. Therefore, the antenna assembly 10 provided in this embodiment is also called a dual-port solution.

[0101] The NFC excitation signal is used to excite the first radiator 131, the second radiator 151 and the third radiator 171 to jointly support the NFC frequency band. It can be seen that the antenna assembly 10 can not only use the second radiator 151 to support the NFC frequency band, but also reuse the first radiator 131 in the first antenna 130 to support the NFC frequency band. In addition, the third radiator 171 in the third antenna 170 can also be reused to support the NFC frequency band. When the size of the second radiator 151 is constant, the first radiator 131 and the third radiator 171 also support the NFC frequency band, thereby increasing the size of the radiator supporting the NFC frequency band in the antenna assembly 10, and expanding the area of ​​the NFC radiator, so that the antenna assembly 10 can communicate with other NFC antennas with higher efficiency, and can improve the NFC performance in some scenarios, so that the antenna assembly 10 is more conducive to wide application in electronics. As can be seen from the previous introduction, the volume of the second radiator 151 when it includes a stacked coil and ferrite is relatively large and the cost is relatively high. Therefore, when the size of the radiator required to support the NFC frequency band is certain, the first radiator 131 and the third radiator 171 also support the NFC frequency band, which can reduce the area of ​​the second radiator 151, thereby making the size of the antenna assembly 10 smaller and the cost lower.

[0102] See also Fig.15 , Fig.15 A schematic diagram of an antenna assembly provided for another embodiment of the present application. The antenna assembly 10 includes a first antenna 130 and a second antenna 150. The first antenna 130 includes a first radiator 131, a first feed source S1 and a first matching circuit M1. The first radiator 131 includes a first end 1311 and a second end 1312. The first end 1311 has a first feeding point P1, and the first feed source S1 is electrically connected to the first feeding point P1, and is used to generate a first excitation signal to excite the first radiator 131 to support a first frequency band. The first matching circuit M1 is arranged adjacent to the first end 1311, and one end of the first matching circuit M1 is electrically connected to the first feeding point P1, and the other end is grounded, and the second end 1312 is a free end. The second antenna 150 includes a second radiator 151 and a second feed source S2. The second feed source S2 is electrically connected to the second radiator 151, and the second antenna 150 is also electrically connected to the second end 1312.

[0103] Further, in this embodiment, the second radiator 151 includes a third end 1511 and a fourth end 1512. The second feed source S2 is electrically connected to the fourth end 1512, and the second feed source S2 is also electrically connected to the second end 1312 of the first radiator 131. The antenna assembly 10 also includes a third antenna 170. The third antenna 170 includes a third radiator 171, a third feed source S3 and a second matching circuit M2. The third radiator 171 includes a fifth end 1711 and a sixth end 1712, and the fifth end 1711 has a second feeding point P2. The third feed source S3 is electrically connected to the second feeding point P2, and is used to generate a second excitation signal to excite the third radiator 171 to support a third frequency band. The second matching circuit M2 is disposed adjacent to the fifth end 1711, and one end of the second matching circuit M2 is electrically connected to the second feeding point P2, and the other end is grounded, and the sixth end 1712 is a free end. The third end 1511 is also electrically connected to the sixth end 1712 , and the NFC excitation signal is used to excite the first radiator 131 , the second radiator 151 , and the third radiator 171 to jointly support the NFC frequency band.

[0104] It is understandable that the antenna assembly 10 in the schematic diagram of the embodiment of the present application also includes the third antenna 170 combined with the schematic diagram of the previous embodiment. In other words, in the schematic diagram of the present embodiment, the antenna assembly 10 also includes the third antenna 170 combined with the second antenna 150 and also includes the first isolation circuit 132, and the first isolation circuit 132 includes the first inductor L1 and the first capacitor C1 as an example for illustration. Please refer to the previous description for the first isolation circuit 132, which will not be repeated here. It is understandable that in other embodiments, the second antenna 150 may not include the first isolation circuit 132; or, in other embodiments, the first isolation circuit 132 includes the first inductor L1 but not the first capacitor C1.

[0105] The type, material, etc. of the third radiator 171 may refer to the description of the third radiator 171 in the previous embodiment, and will not be repeated here.

[0106] In one embodiment, the third antenna 170 further includes a matching circuit, which is named as a second matching circuit M2 for the convenience of description. The second matching circuit M2 of the third antenna 170 is electrically connected to the second feeding point. The second matching circuit M2 of the third antenna 170 is used to adjust the resonant frequency of the third frequency band supported by the third antenna 170. Alternatively, in other embodiments, the second matching circuit M2 is used to match the output impedance of the third feed source S3 with the input impedance of the third radiator 171, so that the third antenna 170 has a higher radiation efficiency in the third frequency band.

[0107] In the antenna assembly 10 provided in the embodiment of the present application, the second matching circuit M2 of the second antenna 150 is arranged adjacent to the fifth end 1711 and electrically connected to the second feeding point P2, but not adjacent to the sixth end 1712 of the third radiator 171 which is a free end. The third end 1511 of the second radiator 151 in the second antenna 150 is electrically connected to the sixth end 1712, but not electrically connected to the second feeding point P2 of the third radiator 171. Therefore, when the third antenna 170 is electrically connected to the third radiator 171, the phenomenon that the components are more difficult to electrically connect to the second feeding point P2 in the related art is avoided. In other words, in the antenna assembly 10 provided in the embodiment of the present application, the second antenna 150 is electrically connected to the free end of the third radiator 171, which is more gradual and facilitates the layout of the antenna assembly 10 in the electronic device 1. In addition, since the other end of the second matching circuit M2 in the third antenna 170 is grounded, the sixth end 1712 of the third radiator 171 in the third antenna 170 does not need to be grounded through a connector, so that the antenna assembly 10 has fewer components and is more convenient for the layout of the antenna assembly 10 in the electronic device 1. Furthermore, the third end 1511 of the second radiator 151 of the second antenna 150 is electrically connected to the sixth end 1712 of the three radiators, and the fifth end 1711 of the third radiator 171 is grounded through the second matching circuit M2, so that the second antenna 150 can use the second radiator 151 and the third radiator 171 when working, further improving the antenna performance of the antenna assembly 10 in the NFC frequency band. Specifically, the NFC excitation signal of the second feed source S2 can excite the first radiator 131, the second radiator 151 and the third radiator 171 to jointly support the NFC frequency band. It can be seen that the antenna assembly 10 can reuse the first radiator 131 in the first antenna 130 and the second radiator 151 in the third antenna 170 to support the NFC frequency band. When the size of the second radiator 151 is constant, the first radiator 131 and the third radiator 171 also support the NFC frequency band, so that the size of the radiator supporting the NFC frequency band in the antenna assembly 10 can be increased, and the area of ​​the NFC radiator can be expanded, so that the antenna assembly 10 can communicate with other NFC antennas with higher efficiency, and the NFC performance in some scenarios can be improved, so that the antenna assembly 10 is more conducive to wide application in electronics. As can be seen from the previous introduction, the volume of the second radiator 151 including the stacked coil and ferrite is relatively large and the cost is relatively high. Therefore, when the size of the radiator supporting the NFC frequency band required as a whole is constant, the first radiator 131 and the third radiator 171 also support the NFC frequency band, which can reduce the area of ​​the second radiator 151, thereby making the size of the antenna assembly 10 smaller and the cost lower.

[0108] In this embodiment, the second feed source S2 is also electrically connected to the second end 1312 of the first radiator 131, and the third end 1511 is also electrically connected to the second feeding point P2. It can be seen that the second antenna 150 is electrically connected to the first antenna 130 and the third antenna 170 respectively. Therefore, the antenna assembly 10 provided in this embodiment is also called a dual-port solution.

[0109] See also Fig.16 , Fig.16 A schematic diagram of an antenna assembly provided in yet another embodiment of the present application. Fig.16 The antenna assembly 10 shown is Fig.15 Further improvement in the embodiment of the antenna assembly 10 described above. In this embodiment, the third antenna 170 further includes a second isolation circuit 172, one end of the second isolation circuit 172 is electrically connected to the third end 1511, one end of the second isolation circuit 172 is electrically connected to the sixth end 1712, and the second isolation circuit 172 is used to isolate the signal of the third frequency band from the signal of the NFC frequency band.

[0110] The second isolation circuit 172 is used to isolate the signal of the third frequency band from the signal of the NFC frequency band. Specifically, the second isolation circuit 172 can reduce or even avoid the influence of the third antenna 170 on the first antenna 130, so as to reduce or even avoid the influence of the NFC frequency band on the third frequency band, so that the antenna assembly 10 can not only work in the third frequency band and the NFC frequency band, but also has good communication performance in the NFC frequency band and the third frequency band.

[0111] Specifically, the setting of the second isolation circuit 172 has no effect or almost no effect on the second antenna 150. The second isolation circuit 172 can block the end (sixth end 1712) of the third radiator 171 of the third antenna 170, and does not change the radiation structure of the end of the third radiator 171. In other words, the second isolation circuit 172 is equivalent to an open circuit for the third radiator 171 of the third antenna 170, and when the third antenna 170 operates in the third frequency band, the second end 1312 needs to be open. Therefore, the third antenna 170 also includes the second isolation circuit 172, which can reduce or even avoid the influence of the NFC frequency band on the third frequency band, and does not change the radiation structure of the end of the third radiator 171.

[0112] See also Fig.16 and Fig.17 , Fig.17 This is an implementation method of the present application Fig.16The second isolation circuit 172 includes a second inductor L2. One end of the second inductor L2 is electrically connected to the third end 1511, and the other end of the second inductor L2 is electrically connected to the sixth end 1712.

[0113] The second inductor L2 satisfies at least one of the following conditions: a single inductor; a plurality of inductors connected in series; a plurality of inductors connected in parallel, etc., which are not limited here.

[0114] In the antenna assembly 10 provided in the embodiment of the present application, the second isolation circuit 172 includes a second inductor L2, and the second inductor L2 is equivalent to an open circuit for the third radiator 171 of the third antenna 170. When the third antenna 170 operates in the first frequency band, the sixth end 1712 needs to be open circuited. Therefore, the second isolation circuit 172 includes the second inductor L2, which can reduce or even avoid the influence of the NFC frequency band on the first frequency band, and does not change the radiation structure of the end of the third radiator 171. The second isolation circuit 172 includes the second inductor L2, and the structure of the second isolation circuit 172 is simple and easy, and thus can reduce or even avoid the influence of the second antenna 150 on the third antenna 170, so as to reduce or even avoid the influence of the NFC frequency band on the first frequency band, so that the antenna assembly 10 can not only operate in the first frequency band and the NFC frequency band, but also has good communication performance in the NFC frequency band and the first frequency band.

[0115] In one implementation, the inductance value of the second inductor L2 ranges from 40 nH to 80 nH.

[0116] The inductance value of the second inductor L2 may be, but is not limited to, 40nH, 45nH, 50nH, 55nH, 60nH, 65nH, 70nH, 75nH, or 80nH, and may also be other values ​​other than the above examples as long as they meet the range of 40nH to 80nH.

[0117] Generally speaking, the larger the inductance value of the second inductor L2 is, the more similar it is to an open circuit, and the smaller the adverse effect on the third antenna 170 is. However, the larger the inductance value of the second inductor L2 is, the larger the volume of the second inductor L2 is, which is not conducive to the layout of the antenna assembly 10 in the electronic device 1; accordingly, the smaller the inductance value of the second inductor L2 is, the greater the adverse effect on the third antenna 170 is. In the antenna assembly 10 provided in the embodiment of the present application, the inductance value of the second inductor L2 is selected in the range of 40nH to 80nH, which can reduce or even avoid the influence of the second antenna 150 on the third antenna 170, so as to reduce or even avoid the influence of the NFC frequency band on the third frequency band, so that the antenna assembly 10 can not only work in the third frequency band and the NFC frequency band, but also has good communication performance in the NFC frequency band and the third frequency band. In addition, the volume of the second inductor L2 can also be taken into account, so that the volume of the second inductor L2 is not too large, which is conducive to the layout of the antenna assembly 10 in the electronic device 1.

[0118] See also Fig.16 and Fig.18 , Fig.18 Another embodiment of this application Fig.16 The second isolation circuit 172 includes a second inductor L2. One end of the second inductor L2 is electrically connected to the third end 1511, and the other end of the second inductor L2 is electrically connected to the sixth end 1712.

[0119] In addition, the second isolation circuit 172 further includes a second capacitor C2, one end of the second capacitor C2 is electrically connected to the one end of the second inductor L2, and the other end of the second capacitor C2 is electrically connected to the ground.

[0120] Please refer to the previous description for the second inductor L2, which will not be repeated here. The second isolation circuit 172 also includes a second capacitor C2. The electrical connection method of the second capacitor C2 in the embodiment of the present application can improve the antenna performance of the third antenna 170. Specifically, the second capacitor C2 can reduce or even avoid the influence of the second antenna 150 on the third antenna 170, so as to reduce or even avoid the influence of the NFC frequency band on the third frequency band, so that the antenna assembly 10 can not only operate in the third frequency band and the NFC frequency band, but also has better communication performance in the NFC frequency band and the third frequency band. In one embodiment, the capacitance value of the second capacitor C2 is greater than 33pF.

[0121] See also Fig.19 , Fig.19A schematic diagram of an antenna assembly provided in another embodiment of the present application. In this embodiment, the antenna assembly 10 further includes a floor 111, and the orthographic projections of the first feeding point P1 and the second feeding point P2 on the floor 111 are both located in the current weak point region 110a of the characteristic mode current of the floor 111, and the second feeding point P2 is spaced apart from the first feeding point P1.

[0122] In this embodiment, the floor 111 is taken as an example of the ground in the circuit board 110. It can be understood that the floor 111 illustrated in this embodiment is the floor in the circuit board 110, which should not be understood as a limitation on the embodiment of the present application. In other embodiments, the floor 111 can also be the ground of the main board, or the ground of the circuit board and the ground of the main board. Please refer to the previous description for the current weak point area 110a of the characteristic mode current of the floor 111, which will not be repeated here.

[0123] In the antenna assembly 10 provided in the embodiment of the present application, the orthographic projection of the second feeding point P2 on the floor 111 is located in the current weak point area 110a of the characteristic mode current of the floor 111. The floor 111 constitutes the main radiation branch of the third frequency band and contributes most of the radiation of the antenna assembly 10. The third radiator 171 is equivalent to acting as a radiation driving device for the entire antenna assembly 10, and becomes the excitation condition for the floor 111 of the circuit board 110 to work in the third frequency band. The energy of the third radiator 171 accounts for a very small proportion. Therefore, in this case, reducing the size of the third radiator 171 has little effect on the overall radiation performance of the antenna assembly 10.

[0124] As can be seen from the above description, the floor 111 has four current weak point areas 110a. The orthographic projections of the first feeding point P1 and the second feeding point P2 on the floor 111 are both located in the current weak point area 110a of the characteristic mode current of the floor 111, and the second feeding point P2 is spaced apart from the first feeding point P1. In this embodiment, the orthographic projection of the first feeding point P1 on the floor 111 is located in one current weak point area 110a, and the orthographic projection of the second feeding point P2 on the floor 111 is located in another current weak point area 110a. In other words, the orthographic projections of the second feeding point P2 and the first feeding point P1 on the floor 111 are located in different current weak point areas 110a. The orthographic projections of the second feeding point P2 and the first feeding point P1 on the floor 111 are located in different current weak point areas 110a, which can facilitate the layout of various components in the antenna assembly 10. It can be understood that in other embodiments, the orthographic projections of the second feeding point P2 and the first feeding point P1 on the floor 111 may be located in the same current weak point area 110a.

[0125] See also Fig. 20 , Fig. 20 for Fig.19 Schematic diagram of the orthographic projection of the second feeding point on the floor in the antenna assembly provided in . The current weak point area 110a where the orthographic projection of the second feeding point P2 on the floor 111 is located 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 O2 and 1 / 16 of the wavelength of the second frequency band as the radius R2. The current weak point area 110a where the orthographic projection of the second feeding point P2 on the floor 111 is located 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 O2 and 1 / 16 of the wavelength of the third frequency band as the radius R.

[0126] 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 of the circle is the intersection of the extension line of the first side 1111 and the extension line of the second side 1112, and the center of the circle 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.

[0127] The orthographic projection of the third feeding point P3 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 and 1 / 16 of the wavelength of the third frequency band as the radius. It can be seen that the area where the second feeding point P2 is set is fan-shaped or fan-like.

[0128] When the current weak point area 110a is selected as 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 and 1 / 16 of the wavelength of the third frequency band as the radius, the current in the area is relatively weak, and the second feeding point P2 on the floor 111 is located in the area as a whole, which can further better excite the excitation current in the same extension direction as the first side 1111, so that the antenna assembly 10 has a higher radiation efficiency in the third frequency band.

[0129] It can be seen from the antenna assembly 10 provided in the above embodiments that the second radiator 151 includes a first radiating portion 151a, a second radiating portion 151b and a third radiating portion 151c. The first radiating portion 151a has the third end 1511. One end of the second radiating portion 151b is bent and connected to one end of the first radiating portion 151a away from the third end 1511. The third radiating portion 151c has the fourth end 1512, and one end of the third radiating portion 151c away from the fourth end 1512 is bent and connected to the other end of the second radiating portion 151b, and the third radiating portion 151c is arranged opposite to the first radiating portion 151a and both are located on the same side of the second radiating portion 151b.

[0130] The above structure of the second radiator 151 of the antenna assembly 10 provided in the embodiment of the present application can make the size of the second radiator 151 larger, and can improve the antenna performance of the antenna assembly 10 in the NFC frequency band. In addition, when the size of the first radiator 131 is small, the above structure of the second radiator 151 can compensate for the impact that the small size of the first radiator 131 may have on the NFC frequency band.

[0131] The antenna assembly 10 provided in one embodiment of the present application is simulated below. Fig.21 , Fig.21 Schematic diagram comparing the efficiency of the antenna assembly provided in the embodiment of the present application and the cellular antenna in the related art. In this schematic diagram, the horizontal axis is frequency, the unit is GHz, and the vertical axis is efficiency, the unit is dB. During the simulation, the first antenna 130 is simulated as a cellular antenna, wherein curve ① is a schematic diagram of the efficiency of the first antenna 130 in the antenna assembly 10 provided in the embodiment of the present application; curve ② is a schematic diagram of the efficiency of the cellular antenna in the related art. It can be seen that in the antenna assembly 10 in the embodiment of the present application, the NFC excitation signal can excite the first radiator 131 to support the NFC frequency band, however, it has little effect on the efficiency of the first frequency band supported by the first antenna 130 itself (about 0.2dB~0.3dB). In addition, the antenna performance of the NFC frequency band in the antenna assembly 10 provided in the embodiment of the present application is also relatively high.

[0132] 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 30.

[0133] The electronic device 1 includes an antenna assembly 10 as provided in any of the above embodiments. Fig. 22 and Fig.23 , Fig. 22 A three-dimensional schematic diagram of an electronic device provided in one embodiment; Fig.23 for Fig. 22 The electronic device 1 further includes a display screen 30, a middle frame 50 and a battery cover 70. The display screen 30 and the battery cover 70 are respectively arranged on opposite sides of the middle frame 50. The middle frame 50 and the battery cover 70 cooperate to form a receiving space. At least a part of the antenna assembly 10 is received in the receiving space.

[0134] 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 10 is used, and the specific structure of the electronic device 1 should not be understood as a limitation on the antenna assembly 10 provided in this application.

[0135] Furthermore, the electronic device 1 includes a back side 1a and a peripheral side 1b. The peripheral side 1b is arranged at the periphery of the back side 1a and is bent and connected to the back side 1a, wherein the first radiator 131 is arranged corresponding to the peripheral side 1b, and the second radiator 151 is arranged corresponding to the back side 1a.

[0136] In this embodiment, the first radiator 131 is arranged corresponding to the peripheral side 1b, and the second radiator 151 is arranged corresponding to the back side 1a. Therefore, when the antenna component 10 in the electronic device 1 communicates with other terminal devices using the NFC frequency band, the back side 1a of the electronic device 1 can be placed close to the terminal device, or the peripheral side 1b of the electronic device 1 can be placed close to the terminal device, so that the electronic device 1 can communicate with other terminal devices using the NFC frequency band more conveniently.

[0137] In one embodiment, the battery cover 70 is disposed on one side of the middle frame 50, the outer appearance surface of the peripheral portion of the middle frame 50 or the outer appearance surface of the peripheral portion of the battery cover 70 constitutes at least part of the peripheral side surface 1b of the electronic device 1, and the first radiating portion 151a is located at the peripheral portion, or the first radiating portion 151a is disposed adjacent to the inner surface of the peripheral portion. The outer appearance surface of the battery cover 70 facing away from the middle frame 50 constitutes at least part of the back surface 1a of the electronic device 1, and the second radiator 151 is disposed between the middle frame 50 and the battery cover 70, and is disposed adjacent to the inner surface of the battery cover 70 facing away from the back surface 1a.

[0138] In the schematic diagram of one embodiment, the appearance surface of the peripheral portion of the middle frame 50 constitutes the peripheral side surface 1b of the electronic device 1. It can be understood that this should not constitute a limitation on the embodiment of the present application. The first radiator 131 is located at the peripheral portion, that is, the first radiator 131 is a metal frame radiator designed for the metal middle frame 50.

[0139] When the electronic device 1 communicates with other terminal devices using the NFC frequency band, the battery cover 70 of the electronic device 1 can be placed close to the terminal device, or the peripheral side 1b of the electronic device 1 can be placed close to the terminal device, so that the electronic device 1 can communicate with other terminal devices using the NFC frequency band more conveniently.

[0140] The electronic device provided in the embodiment of the present application includes an antenna assembly, in which the first matching circuit M1 of the first antenna 130 is arranged adjacent to the first end 1311 and electrically connected to the first feeding point P1, but not adjacent to the second end 1312 of the first radiator 131 which is a free end. The second antenna 150 is electrically connected to the second end 1312 of the first radiator 131 which is a free end of the first antenna 130, but not electrically connected to the first feeding point P1 of the first radiator 131. Therefore, when the second antenna 150 is electrically connected to the first radiator 131, the phenomenon that the layout is difficult when the second antenna 150 is electrically connected to the first feeding point P1 of the first radiator 131 in the related art is avoided. In other words, in the antenna assembly 10 provided in the embodiment of the present application, the second antenna 150 is electrically connected to the free end of the first radiator 131, which is relatively simple and convenient, and it is convenient to layout the antenna assembly 10 in the electronic device 1. In addition, since the other end of the first matching circuit M1 in the first antenna 130 is grounded, the second end 1312 of the first radiator 131 in the first antenna 130 does not need to be grounded through a connector, so that the antenna assembly 10 has fewer components and is more convenient for the layout of the antenna assembly 10 in the electronic device 1. Furthermore, the second antenna 150 is electrically connected to the first radiator 131 and is grounded through the first matching circuit M1, so that the second antenna 150 can use the second radiator 151 and the first radiator 131 when working, further improving the antenna performance of the antenna assembly 10 in the NFC frequency band. Specifically, the NFC excitation signal of the second feed source S2 can excite the first radiator 131 and the second radiator 151 to jointly support the NFC frequency band. It can be seen that the antenna assembly 10 can reuse the first radiator 131 in the first antenna 130 to support the NFC frequency band. When the size of the second radiator 151 is constant, the first radiator 131 also supports the NFC frequency band, so that the size of the radiator supporting the NFC frequency band in the antenna assembly 10 can be increased, and the area of ​​the NFC radiator can be expanded, so that the antenna assembly 10 can communicate with other NFC antennas with higher efficiency, and the NFC performance in some scenarios can be improved, making the antenna assembly 10 more conducive to wide application in electronics. As can be seen from the previous introduction, the volume of the second radiator 151 including the stacked coil and ferrite is relatively large and the cost is relatively high. Therefore, when the size of the radiator supporting the NFC frequency band required as a whole is constant, the first radiator 131 also supports the NFC frequency band, which can reduce the area of ​​the second radiator 151, thereby making the size of the antenna assembly 10 smaller and the cost lower.

[0141] The above is part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An electronic device, characterized in that: The electronic device includes an antenna assembly, the antenna assembly including: a first antenna, the first antenna comprising a floor, a first radiator, a first feed source and a first matching circuit, the first radiator comprising a first end and a second end, the first end having a first feeding point, the orthographic projection of the first feeding point on the floor being located in a current weak point region of a characteristic mode current of the floor, the first feed source being used to generate a first excitation signal, and the first feed source being electrically connected to the first feeding point, the floor being excited by the first radiator to support a first frequency band, the first matching circuit being arranged adjacent to the first end, and one end of the first matching circuit being electrically connected to the first feeding point, and the other end being grounded, and the second end being a free end; and A second antenna, wherein the second antenna includes a second radiator and a second feed source, the second feed source is electrically connected to the second radiator, and the second antenna is also electrically connected to the second end, and the second feed source is used to generate an NFC excitation signal to excite the first radiator and the second radiator to jointly support an NFC frequency band.

2. The electronic device according to claim 1, wherein: The second radiator includes a third end and a fourth end, the third end is electrically connected to the second feed source, and the fourth end is electrically connected to the second end.

3. The electronic device according to claim 2, characterized in that: The first antenna also includes: A first isolation circuit, wherein the second feed source is electrically connected to the first isolation circuit to the second end, and the first isolation circuit is used to isolate signals in the first frequency band from signals in the NFC frequency band.

4. The electronic device according to claim 3, characterized in that: The first isolation circuit comprises: A first inductor, one end of the first inductor is electrically connected to the second end, and the other end of the first inductor is connected to the fourth end.

5. The electronic device according to claim 4, characterized in that: The inductance value of the first inductor ranges from 40nH to 80nH.

6. The electronic device according to claim 4, characterized in that: The first isolation circuit further includes: A first capacitor, one end of the first capacitor is electrically connected to the other end of the first inductor, and the other end of the first capacitor is electrically connected to the ground.

7. The electronic device according to claim 1, wherein: The floor comprises 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, wherein the current weak point area is located in an area with the intersection of the extension line of the first side and the extension line of the second side as the center and 1 / 16 of the wavelength of the first frequency band as the radius.

8. The electronic device according to claim 7, characterized in that: The floor includes two first sides arranged opposite to each other, and two second sides arranged opposite to each other, the number of the current weak point areas is four, the orthographic projection of the first feeding point on the floor is located in any one of the four current weak point areas, and the first radiator is adjacent to the current weak point area where the orthographic projection of the first feeding point on the floor is located.

9. The electronic device according to claim 1, wherein: The second radiator includes a third end and a fourth end, the second feed source is electrically connected to the fourth end, and the second feed source is also electrically connected to the second end of the first radiator; the antenna assembly also includes: A third antenna, the third antenna comprising a third radiator and a third feed source, the third radiator comprising a fifth end and a sixth end, the fifth end having a second feeding point, the third feed source being electrically connected to the second feeding point and used for generating a second excitation signal to excite the third radiator to support a third frequency band, and the sixth end being grounded; The third end is also electrically connected to the second feeding point, and the NFC excitation signal is used to excite the first radiator, the second radiator and the third radiator to jointly support the NFC frequency band.

10. The electronic device according to claim 1, wherein: The second radiator includes a third end and a fourth end, the second feed source is electrically connected to the fourth end, and the second feed source is also electrically connected to the second end of the first radiator; the antenna assembly also includes: A third antenna, the third antenna comprises a third radiator, a third feed source and a second matching circuit, the third radiator comprises a fifth end and a sixth end, the fifth end has a second feeding point, the third feed source is electrically connected to the second feeding point, and is used to generate a second excitation signal to excite the third radiator to support a third frequency band, the second matching circuit is arranged adjacent to the fifth end, and one end of the second matching circuit is electrically connected to the second feeding point, and the other end is grounded, and the sixth end is a free end; wherein the third end is also electrically connected to the sixth end, and the NFC excitation signal is used to excite the first radiator, the second radiator and the third radiator to jointly support the NFC frequency band.

11. The electronic device according to claim 10, characterized in that: The third antenna further comprises: A second isolation circuit, one end of the second isolation circuit is electrically connected to the third end, one end of the second isolation circuit is electrically connected to the sixth end, and the second isolation circuit is used to isolate the signal of the third frequency band from the signal of the NFC frequency band.

12. The electronic device according to claim 11, characterized in that: The second isolation circuit comprises: A second inductor, one end of the second inductor is electrically connected to the third end, and the other end of the second inductor is electrically connected to the sixth end.

13. The electronic device according to claim 12, characterized in that: The inductance value of the second inductor ranges from 40nH to 80nH.

14. The electronic device according to claim 12, characterized in that: The second isolation circuit further includes: A second capacitor, one end of the second capacitor is electrically connected to the one end of the second inductor, and the other end of the second capacitor is electrically connected to the ground.

15. The electronic device according to claim 10, characterized in that: The orthographic projections of the first feeding point and the second feeding point on the floor are both located in the current weak point area of ​​the characteristic mode current of the floor, and the second feeding point is spaced apart from the first feeding point.

16. The electronic device according to claim 1, wherein: The second radiator comprises: A first radiating portion, wherein the first radiating portion has a third end; A second radiating portion, one end of the second radiating portion being bent and connected to an end of the first radiating portion away from the third end; and The third radiating portion has a fourth end, one end of the third radiating portion away from the fourth end is bent and connected to the other end of the second radiating portion, and the third radiating portion and the first radiating portion are arranged opposite to each other and are both located on the same side of the second radiating portion.

17. The electronic device according to any one of claims 1 to 16, characterized in that: The electronic device includes a back side and a peripheral side surface, wherein the peripheral side surface is arranged at the periphery of the back side and is connected to the back side in a bend, wherein the first radiator is arranged corresponding to the peripheral side surface, and the second radiator is arranged corresponding to the back side.

18. The electronic device according to claim 17, characterized in that: The electronic device also includes a middle frame and a battery cover, the battery cover is arranged on one side of the middle frame, the peripheral portion of the middle frame or the peripheral portion of the battery cover constitutes at least part of the peripheral side surface of the electronic device, the first radiating portion is located at the peripheral portion, or the first radiating portion is arranged adjacent to the inner surface of the peripheral portion; the appearance surface of the battery cover facing away from the middle frame constitutes at least part of the back side of the electronic device, and the second radiator is arranged between the middle frame and the battery cover, and is arranged adjacent to the inner surface of the battery cover facing away from the back side.

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