Electronic equipment with communication function

Abstract

The embodiment of the invention provides electronic equipment with a communication function. The electronic equipment comprises a first antenna unit, a second antenna unit, a third antenna unit, a fourth antenna unit and a grounding plate. Each antenna unit comprises a radiation branch knot and a feed source, and each radiation branch knot supports receiving and transmitting of electromagnetic wave signals under excitation of the corresponding feed source and further excites the grounding plate to generate current in the corresponding direction. Wherein the radiation branches in the first antenna unit, the second antenna unit, the third antenna unit and the fourth antenna unit are arranged at intervals, and the directions of currents generated by exciting the grounding plate are at least partially different, so that the main radiation directions are different from one another, and the radiation branches in the first antenna unit, the second antenna unit, the third antenna unit and the fourth antenna unit are separated at the same time. And the radiation branches in the first, second, third and fourth antenna units support the same frequency band of received and transmitted electromagnetic wave signals, so that an MIMO antenna system is formed. The invention also provides the antenna assembly. The antenna communication performance can be effectively improved.

Description

Technical Field

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

[0002] At present, with the popularization of 5G communication technology, people's communication experience is getting better and better, but the number of antennas is also increasing. With the popularization of full-screen and curved screens, the clearance left for antennas is getting smaller and smaller. Therefore, how to ensure the communication quality of antennas without increasing the size of electronic devices has become a problem that needs to be solved. Summary of the invention

[0003] The present application provides an electronic device with communication function to solve the above problems.

[0004] In a first aspect, an electronic device with a communication function is provided, the electronic device comprising a first antenna unit, a second antenna unit, a third antenna unit, a fourth antenna unit and a ground plane. The first antenna unit comprises a first radiating branch and a first feed source, the first radiating branch comprises a first feeding point, the first feeding point is connected to the first feed source, and the first radiating branch supports the reception and transmission of electromagnetic wave signals under the excitation of the first feed source. The second antenna unit comprises a second radiating branch and a second feed source, the second radiating branch comprises a second feeding point, the second feeding point is connected to the second feed source, and the second radiating branch supports the reception and transmission of electromagnetic wave signals under the excitation of the second feed source. The third antenna unit comprises a third radiating branch and a third feed source, the third radiating branch comprises a third feeding point, the third feeding point is connected to the third feed source, and the third radiating branch supports the reception and transmission of electromagnetic wave signals under the excitation of the third feed source. The fourth antenna unit includes a fourth radiation branch and a fourth feed source, the fourth radiation branch includes a fourth feed point, the fourth feed point is connected to the fourth feed source, and the fourth radiation branch supports the reception and transmission of electromagnetic wave signals under the excitation of the fourth feed source. The first radiation branch, the second radiation branch, the third radiation branch and the second radiation branch are arranged at different positions close to the ground plane and are spaced from each other, the first radiation branch, the second radiation branch, the third radiation branch and the second radiation branch are respectively coupled to excite the ground plane to generate corresponding currents, and the directions of the currents generated by the coupling excitation of the ground plane by different radiation branches are at least partially different, so that the main radiation directions of the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch are respectively different, wherein, at the same time, the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch support the same frequency band of electromagnetic wave signals for reception and transmission, thereby forming a MIMO antenna system.

[0005] The electronic device with communication function of the present application can form a MIMO antenna system through four antenna units, which can effectively improve the communication performance in a specific frequency band. Moreover, since the main radiation directions of the four radiation branches of the four antenna units are different, the interference between each other will be smaller and the isolation requirements will be met, thereby effectively improving the antenna communication performance as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0007] Figure 1 This is a simple structural diagram illustrating part of the internal structure of an electronic device with communication function in an embodiment of the present application.

[0008] Figure 2 This is a schematic diagram of the distribution of current generated by exciting a ground plate when an antenna unit of an electronic device in some embodiments of the present application is working.

[0009] Figure 3 Another simple structural schematic diagram illustrating part of the internal structure of an electronic device in some embodiments of the present application.

[0010] Figure 4 It is a schematic overall plan view of an electronic device in some embodiments of the present application.

[0011] Figure 5 This is another simple structural diagram illustrating part of the internal structure of an electronic device in some embodiments of the present application.

[0012] Figure 6 Schematic diagram of the internal structure of the first matching unit or the second matching unit in some embodiments of the present application.

[0013] Figure 7 This is a further schematic diagram of the internal structure of the first matching unit or the second matching unit in some embodiments of the present application.

[0014] Figure 8 This is a further schematic diagram of the internal structure of the first matching unit or the second matching unit in some embodiments of the present application.

[0015] Fig. 9 Schematic diagram of the internal structure of the third matching unit or the fourth matching unit in some embodiments of the present application.

[0016] Fig.10 Schematic diagram of another internal structure of the first matching unit or the second matching unit in some embodiments of the present application.

[0017] Fig.11 This is a schematic diagram of a return loss curve when a first antenna unit or a second antenna unit in an electronic device in some embodiments of the present application operates in multiple frequency bands through a corresponding adjustable matching unit.

[0018] Fig.12 It is a schematic diagram of the distribution of the current generated by stimulating the ground plate when the first antenna unit in the electronic device in some embodiments of the present application works alone.

[0019] Fig.13 It is a schematic diagram of the distribution of the current generated by stimulating the ground plate 5 when the second antenna unit in the electronic device in some embodiments of the present application works alone.

[0020] Fig.14 It is a schematic diagram of the distribution of the current generated by stimulating the ground plate 5 when the third antenna unit in the electronic device in some embodiments of the present application works alone.

[0021] Fig.15 It is a schematic diagram of the distribution of the current generated by stimulating the ground plate 5 when the fourth antenna unit in the electronic device in some embodiments of the present application works alone.

[0022] Fig.16 This is a schematic diagram of the antenna radiation direction when the first antenna unit in the electronic device in some embodiments of the present application works alone.

[0023] Fig.17 This is a schematic diagram of the antenna radiation direction when the second antenna unit in the electronic device in some embodiments of the present application works alone.

[0024] Fig.18 This is a schematic diagram of the antenna radiation direction when the third antenna unit in the electronic device in some embodiments of the present application works alone.

[0025] Fig.19 This is a schematic diagram of the antenna radiation direction when the fourth antenna unit in the electronic device in some embodiments of the present application works alone.

[0026] Fig. 20 Schematic diagram of envelope correlation coefficient (ECC) curves between two of four antenna units of an electronic device in some embodiments of the present application.

[0027] Fig.21 Schematic diagram of a total system efficiency curve of four antenna units of an electronic device in some embodiments of the present application.

[0028] Fig. 22 Another overall plan view of an electronic device in some embodiments of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "thickness", "width", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than implying or indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "connection" in this application includes the meanings of physical structural connection, electrical connection, direct connection or indirect connection, and can be determined specifically according to the required connection situation. In the description of the embodiments of the present invention, the terms "first", "second", "third", "fourth", etc. are not specific, but are used to distinguish objects with the same name. If there is a description in the specification, the objects with the same name referred to by the terms "first", "second", "third", "fourth", etc. may be the same objects.

[0031] See also Figure 1 , is a simple structural diagram showing part of the internal structure of an electronic device 100 (hereinafter referred to as: electronic device 100) with communication function in an embodiment of the present application. Figure 1As shown, the electronic device 100 includes a first antenna unit 1, a second antenna unit 2, a third antenna unit 3, a fourth antenna unit 4 and a ground plane 5. The first antenna unit 1 includes a first radiating branch 11 and a first feed source 12. The first radiating branch 11 includes a first feeding point F1, the first feeding point F1 is connected to the first feed source 12, and the first radiating branch 11 supports the transmission and reception of electromagnetic wave signals under the excitation of the first feed source 12. The second antenna unit 2 includes a second radiating branch 21 and a second feed source 22. The second radiating branch 21 includes a second feeding point F2, the second feeding point F2 is connected to the second feed source 22, and the second radiating branch 21 supports the transmission and reception of electromagnetic wave signals under the excitation of the second feed source 22. The third antenna unit 3 includes a third radiating branch 31 and a third feed source 32. The third radiating branch 31 includes a third feeding point F3, the third feeding point F3 is connected to the third feed source 32, and the third radiating branch 31 supports the transmission and reception of electromagnetic wave signals under the excitation of the third feed source 32. The fourth antenna unit 4 includes a fourth radiating branch 41 and a fourth feed source 42 . The fourth radiating branch 41 includes a fourth feeding point F4 . The fourth feeding point F4 is connected to the fourth feed source 42 . The fourth radiating branch 41 supports the transmission and reception of electromagnetic wave signals under the excitation of the fourth feed source 42 . Among them, the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are arranged at different positions close to the grounding plate 5 and are spaced from each other. The first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the second radiation branch 21 respectively couple and excite the grounding plate 5 to generate corresponding currents, and the directions of the currents generated by the coupling excitation of the grounding plate 5 by different radiation branches are at least partially different, so that the main radiation directions of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are different. Among them, at the same time, the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 support the same frequency band of electromagnetic wave signals for transmission and reception, thereby forming a MIMO antenna system.

[0032] Thus, in the present application, a MIMO antenna system can be formed by four antenna units, which can effectively improve the communication performance in a specific frequency band, and the first radiating branch 11, the second radiating branch 21, the third radiating branch 31 and the second radiating branch 21 couple to excite the ground plate 5 to generate corresponding currents, and the direction of the current generated by the coupling excitation of the ground plate 5 by each radiating branch affects the main radiation direction of each radiating branch, so that the direction of the current generated by the coupling excitation of the ground plate 5 by different radiating branches is at least partially different, so that the main radiation directions of the four radiating branches of the four antenna units are different, so that the interference between each other will be smaller and the isolation requirements will be met, so that the antenna communication performance can be effectively improved as a whole.

[0033] Among them, the main radiation direction is the main lobe direction of the radiating branch of the antenna unit. Generally speaking, the energy of the electromagnetic wave signal is mainly concentrated in the main lobe direction, that is, the main radiation direction. When the main radiation directions of the radiating branches of any two antenna units are different, the main radiation energies between the two will not interfere with each other or the interference will be small, so that the isolation between the two meets the requirements.

[0034] The grounding plate 5 is used for grounding and providing ground potential. The grounding plate 5 can be any structure such as a grounding layer of a middle frame or a mainboard, which will be described in detail later.

[0035] Please also read Figure 2 , which is a schematic diagram of the distribution of the current generated by exciting the ground plate 5 when the antenna unit of the electronic device 100 in some embodiments of the present application is working.

[0036] Among them, Figure 1 and Figure 2 As shown, the ground plate 5 includes a first side B1 and a second side B2 relative to each other and a third side B3 and a fourth side B4 relative to each other, the first radiation branch 11 is adjacent to the first side B1 and is parallel to the first side B1, the second radiation branch 21 is adjacent to the second side B2 and is parallel to the second side B2, the first radiation branch 11 and the second radiation branch 21 are close to the third side B3, and the first feeding point F1 is located at a position of the first radiation branch 11 close to the third side B3, and the second feeding point F2 is located at a position of the second radiation branch 21 close to the third side B3. Figure 2As shown, the ground plate 5 generates a first longitudinal current I11 along the third side B3 to the fourth side B4 and a first transverse current I21 along the first side B1 to the second side B2 under the coupling excitation of the first radiation branch 11, and generates a first longitudinal current I11 along the third side B3 to the fourth side B4 and a second transverse current I22 along the second side B2 to the first side B1 under the coupling excitation of the second radiation branch 21. The third radiation branch 31 at least includes a first branch portion 311 adjacent to the fourth side B4 and parallel to the fourth side B4, the fourth radiation branch 41 at least includes a second branch portion 411 adjacent to the second side B2 and parallel to the second side B2, the third feeding point F3 is arranged at the first branch portion 311, the fourth feeding point F4 is arranged at the second branch portion 411, and the grounding plate 5 mainly generates a second longitudinal current I12 in the direction from the fourth side B4 to the third side B3 under the coupling excitation of the third radiation branch 31, and the grounding plate 5 mainly generates a second transverse current I22 in the direction from the second side B2 to the first side B1 under the coupling excitation of the fourth radiation branch 41.

[0037] Thus, in the present application, since the first radiating branch 11 is adjacent to the first side B1 and parallel to the first side B1, the first radiating branch 11 is also close to the third side B3, and the first feeding point F1 is located at a position of the first radiating branch 11 close to the third side B3, thus, the first feeding point F1 is close to the third side B3, and since the feeding point is usually a point with large current and large coupling energy, the first feeding point F1 close to the third side B3 can effectively excite the first longitudinal current I11 of the grounding plate 5 along the third side B3 to the fourth side B4, and since the first radiating branch 11 is adjacent to the first side B1 and parallel to the first side B1, it can also excite the first transverse current I21 of part of the grounding plate 5 in the direction from the first side B1 to the second side B2. Similarly, since the second radiating branch 21 is adjacent to the second side B2 and parallel to the second side B2, the second radiating branch 21 is also close to the third side B3, and the first feeding point F1 is located at a position of the first radiating branch 11 close to the third side B3, thus, the second feeding point F2 is close to the third side B3, and since the feeding point is usually a point with large current and large coupling energy, the second feeding point F2 close to the third side B3 can also effectively excite the first longitudinal current I11 of the grounding plate 5 along the third side B3 to the fourth side B4, and since the second radiating branch 21 is adjacent to the second side B2 and parallel to the second side B2, it can also excite the second transverse current I22 of part of the grounding plate 5 in the direction from the second side B2 to the first side B1.

[0038] Similarly, since the third radiation branch 31 at least includes a first branch portion 311 adjacent to and parallel to the fourth side B4, and the third feeding point F3 is arranged at the first branch portion 311, the third feeding point F3 with a larger current can effectively excite the second longitudinal current I12 of the grounding plate 5 in the direction from the fourth side B4 to the third side B3. Since the fourth radiation branch 41 at least includes a second branch portion 411 adjacent to and parallel to the second side B2, and the fourth feeding point F4 is arranged at the second branch portion 411, the fourth feeding point F4 with a larger current can effectively excite the second transverse current I22 of the grounding plate 5 in the direction from the second side B2 to the first side B1.

[0039] Wherein, the ground plate 5 generates a first longitudinal current I11 along the direction from the third side B3 to the fourth side B4 and a first transverse current I21 along the direction from the first side B1 to the second side B2 under the coupling excitation of the first radiation branch 11, so that the overall equivalent current generated by the ground plate 5 under the coupling excitation of the first radiation branch 11 is the vector sum of the first longitudinal current I11 and the first transverse current, and the ground plate 5 generates a first longitudinal current I11 along the direction from the third side B3 to the fourth side B4 and a second transverse current I22 along the direction from the second side B2 to the first side B1 under the coupling excitation of the second radiation branch 21, so that the overall equivalent current generated by the ground plate 5 under the coupling excitation of the second radiation branch 21 is the vector sum of the first longitudinal current I11 and the second transverse current. Therefore, although the directions of the first longitudinal current I11 generated by the ground plate 5 under the coupling excitation of the first radiation branch 11 and the second radiation branch 21 are the same, since the directions of the first transverse current and the second transverse current are opposite, the directions of the final equivalent currents can deviate from each other. The main radiation direction of the radiation branch is mainly determined by the direction of the final equivalent current of the ground plate 5 under the coupling excitation of the radiation branch. Therefore, the main radiation directions of the first radiation branch 11 and the second radiation branch 21 deviate from each other and become different.

[0040] In addition, since the grounding plate 5 mainly generates the second longitudinal current I12 from the fourth side B4 to the third side B3 under the coupling excitation of the third radiation branch 31, that is, the overall equivalent current at this time is the second longitudinal current I12 from the fourth side B4 to the third side B3, the grounding plate 5 generates the second transverse current I22 mainly from the second side B2 to the first side B1 under the coupling excitation of the fourth radiation branch 41, that is, the overall equivalent current at this time is the second transverse current I22 from the second side B2 to the first side B1. Therefore, the directions of the currents generated by the grounding plate 5 under the coupling excitation of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are all different as a whole, so that the main radiation directions of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are different.

[0041] Among them, in the present application, the ground plate 5 can actually serve as a radiator shared by the first antenna unit 1, the second antenna unit 2, the third antenna unit 3, and the fourth antenna unit 4, and participate in radiation together with the corresponding radiating branches included in the first antenna unit 1, the second antenna unit 2, the third antenna unit 3, and the fourth antenna unit 4, and the radiation energy is more distributed on the ground plate 5. Therefore, the direction of the current generated by the radiating branches included in the first antenna unit 1, the second antenna unit 2, the third antenna unit 3, and the fourth antenna unit 4 respectively excites the ground plate 5, which determines the radiation direction of the corresponding antenna unit.

[0042] In some embodiments, the third feeding point F3 can be specifically set at a position of the first branch portion 311 that is relatively far from the first side B1, so as to mainly stimulate the ground plate 5 to generate a second longitudinal current I12 in the direction from the fourth side B4 to the third side B3, and the fourth feeding point F4 can be specifically set at a position of the second branch portion 411 that is relatively far from the fourth side B4, so as to mainly stimulate the ground plate 5 to generate a second transverse current I22 in the direction from the second side B2 to the first side B1. The first branch portion 311 can be overall close to the first side B1 and relatively far from the second side B2, and the second branch portion 411 can be overall close to the fourth side B4 and relatively far from the third side B3. Thus, the intervals between the four radiation branches can be increased as a whole, and the isolation between them can be improved.

[0043] In this application, A and B being adjacent means that A and B are close to each other and spaced apart. For example, the distance between A and B is less than a preset distance, such as 1 cm, and they are spaced apart from each other.

[0044] In some embodiments, Figure 1 and Figure 2 As shown, the ground plate 5 is rectangular, the first side B1 and the second side B2 are long sides, and the third side B3 and the fourth side B4 are short sides. Therefore, since the second radiation branch 21 is adjacent to and parallel to the second side B2, and the fourth radiation branch 41 at least includes a second branch portion 411 adjacent to and parallel to the second side B2, when the first side B1 and the second side B2 are long sides, it is possible to ensure that there is enough spacing between the second radiation branch 21 and the second branch portion 411 of the fourth radiation branch 41, and the required setting space of the first radiation branch 11 and the second radiation branch 21 can also be met.

[0045] See also Figure 3 , is another simple structural diagram illustrating a part of the internal structure of the electronic device 100 in some embodiments of the present application. Figure 3As shown, the first antenna unit 1 includes a first matching unit M1 connected to the first radiation branch 11, the second antenna unit 2 includes a second matching unit M2 connected to the second radiation branch 21, the third antenna unit 3 includes a third matching unit M3 connected to the third radiation branch 31, and the fourth antenna unit M4 includes a fourth matching unit M4 connected to the fourth radiation branch 41. Wherein, at the same time, the equivalent electrical length of the first radiation branch under the cooperation of the first matching unit, the equivalent electrical length of the second radiation branch under the cooperation of the second matching unit, the equivalent electrical length of the third radiation branch under the cooperation of the third matching unit, and the equivalent electrical length of the fourth radiation branch under the cooperation of the fourth matching unit are equal, so that the first radiation branch, the second radiation branch, the third radiation branch, and the fourth radiation branch support the same frequency band of electromagnetic wave signals for transmission and reception.

[0046] That is, in some embodiments, the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 all include matching units, and the radiating branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 have an equivalent electrical length corresponding to the frequency band of the electromagnetic wave signals supported for transmission and reception under the cooperation of the corresponding matching units, and the radiating branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 have an equivalent electrical length the same when cooperated with the corresponding matching units, so that the first radiating branch, the second radiating branch, the third radiating branch and the fourth radiating branch support the same frequency band of the electromagnetic wave signals supported for transmission and reception.

[0047] The equivalent electrical length of the first radiating branch under the cooperation of the first matching unit, the equivalent electrical length of the second radiating branch under the cooperation of the second matching unit, the equivalent electrical length of the third radiating branch under the cooperation of the third matching unit, and the equivalent electrical length of the fourth radiating branch under the cooperation of the fourth matching unit are equal, so that the first radiating branch, the second radiating branch, the third radiating branch and the fourth radiating branch support the same frequency band of electromagnetic wave signals for transmission and reception, thereby forming a MIMO antenna system.

[0048] Obviously, in other embodiments, when only a MIMO antenna system with a fixed frequency band needs to be implemented, that is, the frequency band of the electromagnetic wave signals received and transmitted supported by the radiating branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 is a fixed same frequency band, the first matching unit M1, the second matching unit M2, the third matching unit M3 and the fourth antenna unit M4 may also be omitted, and the electrical length of the first radiating branch 11, the second radiating branch 21, the third radiating branch 31 and the fourth radiating branch 41 itself may correspond to the fixed same frequency band, for example, it may be 1 / 4 of the wavelength corresponding to the fixed same frequency band, thereby supporting the reception and transmission of electromagnetic wave signals in this frequency band.

[0049] Wherein, in some embodiments, Figure 1-Figure 3 As shown, the first antenna unit 1 and the second antenna unit 2 have the same antenna form, and the third antenna unit 3 and the fourth antenna unit 4 have the same antenna form.

[0050] That is, in some embodiments, the antenna types of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 are identical in pairs.

[0051] Among them, Figure 1-Figure 3 As shown, in some embodiments, the first antenna unit 1 and the second antenna unit 2 are monopole antennas, both ends of the first radiating branch 11 and the second radiating branch 21 are open ends, the third antenna unit 3 and the fourth antenna unit 4 are inverted F antennas (IFA, Inverted F Antenna), the third radiating branch 31 includes a relative first open end P1 and a first ground end P2, the fourth radiating branch 41 includes a relative second open end P3 and a second ground end P4, and the first ground end P2 and the second ground end P4 are used for grounding.

[0052] That is, in some embodiments, the antenna form of the first antenna unit 1 and the second antenna unit 2 may specifically be a monopole antenna, and both ends of the first radiating branch 11 of the first antenna unit 1 and the second radiating branch 21 of the second antenna unit 2 are open ends, and the third antenna unit 3 and the fourth antenna unit 4 are inverted F antennas, and the third radiating branch 31 of the third antenna unit 3 includes a relative first open end P1 and a first grounding end P2 for grounding, and the fourth radiating branch 41 of the fourth antenna unit 4 includes a relative second open end P3 and a second grounding end P4 for grounding.

[0053] The first feeding point F1 is disposed between the two ends of the first radiating branch 11 and is disposed close to one end thereof. As mentioned above, the first radiating branch 11 is adjacent to the first side B1 and is parallel to the first side B1, and the first radiating branch 11 is adjacent to the third side B3, so one end of the first radiating branch 11 is adjacent to the third side B3, wherein the first feeding point F1 can be disposed close to the end of the first radiating branch 11 that is adjacent to the third side B3. The second feeding point F2 is disposed between the two ends of the second radiating branch 21 and is disposed close to one end thereof. As mentioned above, the first radiating branch 11 is adjacent to the second side B2 and is parallel to the second side B2, and the second radiating branch 21 is adjacent to the third side B3, so one end of the second radiating branch 21 is also adjacent to the third side B3, wherein the second feeding point F2 can be disposed close to the end of the second radiating branch 21 that is adjacent to the third side.

[0054] The third feeding point F3 is disposed between the first open-circuit end P1 and the first ground end P2 of the third radiation branch 31 , and the fourth feeding point F4 is disposed between the second open-circuit end P3 and the second ground end P4 of the fourth radiation branch 41 .

[0055] Among them, in the present application, since the main radiation structures included in the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 are respectively the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41, the antenna forms of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 may also refer to the structural forms of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41, respectively, and the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 support the transmission and reception of electromagnetic wave signals, and may also be the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 support the transmission and reception of electromagnetic wave signals, respectively.

[0056] Among them, Figure 1-Figure 3As shown, in some embodiments, the third radiating branch 31 also includes a third branch portion 312 connected to the first branch portion 311, and the third branch portion 312 is adjacent to the first side B1 and parallel to the first side B1; the fourth radiating branch 41 also includes a fourth branch portion 412 connected to the second branch portion 411, and the fourth branch portion 412 is adjacent to the fourth side B4 and parallel to the fourth side B4, wherein the first open end P1 is the end of the third branch portion 312 that is not connected to the first branch portion 311, the first grounding end P2 is the end of the first branch portion 311 that is not connected to the third branch portion 312, the second open end P3 is the end of the fourth branch portion 412 that is not connected to the second branch portion 411, and the second grounding end P4 is the end of the second branch portion 411 that is not connected to the fourth branch portion 412.

[0057] That is, in some embodiments, the third radiating branch 31 and the fourth radiating branch 41 are substantially L-shaped. Specifically, the first branch portion 311 is in a straight bar shape, adjacent to and parallel to the fourth side B4, and the third branch portion 312 is also in a straight bar shape, adjacent to and parallel to the first side B1, so that the first branch portion 311 is connected to the third branch portion 312 to form a substantially L-shaped structure. Similarly, the second branch portion 411 is in a straight bar shape, adjacent to and parallel to the second side B2, and the fourth branch portion 412 is also in a straight bar shape, adjacent to and parallel to the fourth side B4, so that the second branch portion 411 is connected to the fourth branch portion 412 to form a substantially L-shaped structure.

[0058] The first radiating branch nodes 11 and the second radiating branch nodes 21 are both in a straight strip shape, and are respectively disposed adjacent to and parallel to the first side B1 and the second side B2.

[0059] Among them, Figure 3As shown, the first matching unit M1 is specifically connected between the first feed source 12 and the first feeding point F1, and the second matching unit M2 is connected between the second feed source 22 and the second feeding point F2; the third radiating branch 31 also includes a first grounding point G1, and the first grounding point G1 is located between the first open-circuit end P1 and the third feeding point F3, and the fourth radiating branch 41 also includes a second grounding point G2, and the second grounding point G2 is located between the second open-circuit end P3 and the fourth feeding point F4, the third matching unit M3 is connected between the first grounding point G1 and the ground, and the fourth matching unit M4 is connected between the second grounding point G2 and the ground. Among them, at the same time, the equivalent electrical length of the first radiation branch 11 under the cooperation of the first matching unit M1, the equivalent electrical length of the second radiation branch 21 under the cooperation of the second matching unit M2, the equivalent electrical length of the third radiation branch 31 under the cooperation of the third matching unit M3, and the equivalent electrical length of the fourth radiation branch 41 under the cooperation of the fourth matching unit M4 are equal, so that the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 support the same frequency band of electromagnetic wave signals received and transmitted. Among them, the equivalent electrical length of the first matching unit M1 and the second matching unit M2 is greater than the equivalent electrical length of the third matching unit M3 and the fourth matching unit M3, and the size of the first radiation branch 11 and the second radiation branch 21 is smaller than the size of the third radiation branch 31 and the fourth radiation branch 41.

[0060] Among them, since the first matching unit M1, the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 can all be equivalent to a certain electrical length, and at the same time, the electrical length equivalent to the first radiation branch 11 under the cooperation of the first matching unit M1, the electrical length equivalent to the second radiation branch 21 under the cooperation of the second matching unit M2, the electrical length equivalent to the third radiation branch 31 under the cooperation of the third matching unit M3 and the electrical length equivalent to the fourth radiation branch 41 under the cooperation of the fourth matching unit M4 are equal, the first matching unit M1, the second matching unit M2, the third matching unit M3, the third matching unit M4 and the fourth matching unit M4 are equivalent to each other. The equivalent electrical length of the first matching unit M1 and the second matching unit M2 is greater than the equivalent electrical length of the third matching unit M3 and the fourth matching unit M3. Therefore, the electrical length of the first radiation branch 11 and the second radiation branch 21 themselves will be smaller than the electrical length of the third radiation branch 31 and the fourth radiation branch 41. For radiation branches with more regular shapes, the electrical length is often proportional to the size. Therefore, the size of the first radiation branch 11 and the second radiation branch 21 is smaller than the size of the third radiation branch 31 and the fourth radiation branch 41.

[0061] Among them, Figure 3 As shown, the first grounding point G1 can be specifically set at the third branch portion 312 of the third radiation branch 31 , and the second grounding point G2 can be specifically set at the second branch portion 411 of the fourth radiation branch 41 .

[0062] Please also read Figure 4 , is a schematic diagram of the overall plan view of the electronic device 100 in some embodiments of the present application. Figure 4 As shown, the electronic device 100 includes a top D1, a bottom D2, and two side edges D3 and D4. Figure 4 The third side B3 of the grounding plate 5 may be an edge located at or close to the top D1 of the electronic device 100, the fourth side B4 of the grounding plate 5 may be an edge located at or close to the bottom D2 of the electronic device 100, the first side B1 of the grounding plate 5 may be an edge located at or close to one side D3 of the electronic device 100, the first side B1 of the grounding plate 5 may be an edge located at or close to one side D3 of the electronic device 100, and the second side B2 of the grounding plate 5 may be an edge located at or close to another side D4 of the electronic device 100.

[0063] As mentioned above, the first radiation branch 11 is adjacent to the first side B1 and parallel to the first side B1, the second radiation branch 21 is adjacent to the second side B2 and parallel to the second side B2, and the first radiation branch 11 and the second radiation branch 21 are close to the third side B3, so that, in some embodiments, the first radiation branch 11 and the second radiation branch 21 are arranged at a position of the electronic device 100 close to the top D1 of the electronic device 100. Since the first radiation branch 11 and the second radiation branch 21 are small in size, they can effectively save space and make room for the design of other antennas.

[0064] In addition, as mentioned above, since the first radiating branch 11 is adjacent to the first side B1 and parallel to the first side B1, the first radiating branch 11 is close to the third side B3, and the first feeding point F1 is located at a position of the first radiating branch 11 close to the third side B3, thus, the first feeding point F1 is close to the third side B3, and since the feeding point is usually a point with large current and large coupling energy, the first feeding point F1 close to the third side B3 can effectively excite the first longitudinal current I11 of the ground plate 5 along the third side B3 to the fourth side B4. Similarly, since the second radiation branch 21 is adjacent to the second side B2 and parallel to the second side B2, the second radiation branch 21 is close to the third side B3, and the first feeding point F1 is located at the position of the first radiation branch 11 close to the third side B3, the second feeding point F2 is close to the third side B3, and since the feeding point is usually a point with large current and large coupling energy, the second feeding point F2 close to the third side B3 can also effectively excite the first longitudinal current I11 along the third side B3 to the fourth side B4 of the ground plate 5. Therefore, even if the first radiation branch 11 and the second radiation branch 21 are small in size, the antenna radiation performance can be effectively ensured by fully exciting the first longitudinal current I11 along the third side B3 to the fourth side B4 of the ground plate 5.

[0065] As mentioned above, the third radiating branch 31 includes a first branch portion 311 adjacent to the fourth side B4 and parallel to the fourth side B4 and a third branch portion 312 adjacent to the first side B1 and parallel to the first side B1, and the fourth radiating branch 41 includes a second branch portion 411 adjacent to the second side B2 and parallel to the second side B2 and a fourth branch portion 412 adjacent to the fourth side B4 and parallel to the fourth side B4. Therefore, the third radiating branch 31 and the fourth radiating branch 41 are mainly arranged at a position close to the bottom D2 of the electronic device 100. Since the overall size of the third radiating branch 31 and the fourth radiating branch 41 is relatively large, even if they are arranged at the bottom D2 of the electronic device 100, they can avoid being completely held by the user's hand, thereby effectively avoiding the antenna performance from being affected. Since the third radiating branch 31 and the fourth radiating branch 41 are roughly L-shaped and are both arranged at the vertex positions corresponding to the two corresponding sides adjacent to the ground plate 5, the space at the vertex positions can be fully utilized without occupying the space of other radiating branches or devices, thereby meeting larger size requirements.

[0066] In addition, as mentioned above, since the first ground terminal P2 is the end of the first branch portion 311 that is not connected to the third branch portion 312, Figure 3 As shown, the third feeding point F3 of the third radiation branch 31 and the first grounding terminal P2 are both arranged at the first branch portion 311 adjacent to the fourth side B4 and parallel to the fourth side B4, and since the position of the grounding terminal is also a point with a larger current, the second longitudinal current I12 from the fourth side B4 to the third side B3 of the grounding plate 5 can be further effectively stimulated. Since the second grounding terminal P4 is the end of the second branch portion 411 that is not connected to the fourth branch portion 412, as shown in FIG. Figure 3 As shown, the fourth feeding point F4 of the fourth radiating branch 41 and the second grounding terminal P4 are both located in the second branch portion 411, and the two are also arranged close to each other. Similarly, since the position of the grounding terminal is also a point with larger current, it can further effectively stimulate the second transverse current I22 of the grounding plate 5 along the second side B2 to the first side B1.

[0067] In some embodiments, the first matching unit M1 and the second matching unit M2 may be strong matching units, while the third matching unit M3 and the fourth matching unit M4 may be weak matching units. For example, the equivalent electrical length of the first radiation branch 11 under the cooperation of the first matching unit M1, the equivalent electrical length of the second radiation branch 21 under the cooperation of the second matching unit M2, the equivalent electrical length of the third radiation branch 31 under the cooperation of the third matching unit M3, and the equivalent electrical length of the fourth radiation branch 41 under the cooperation of the fourth matching unit M4 are equal, all of which are target electrical lengths, and all correspond to the target frequency band of the electromagnetic wave signal currently supported for transmission and reception, the equivalent electrical lengths of the first matching unit M1 and the second matching unit M2 account for a larger proportion of the target electrical length, for example, greater than or equal to 30%; while the third matching unit M3 and the fourth matching unit M3 account for a smaller proportion of the target electrical length, for example, less than or equal to 10%.

[0068] Therefore, the equivalent electrical length of the first radiating branch 11 and the second radiating branch 21 can be smaller, so the size can be smaller, which is conducive to miniaturization of the antenna, and because they are arranged at a position close to the top D1 of the electronic device 100, they are generally not held by the user. The equivalent electrical length of the third radiating branch 31 and the fourth radiating branch 41 themselves needs to be larger, so the size is larger. When they are arranged at a position close to the bottom D1 of the electronic device 100, it is beneficial to avoid the entire branch being held, and avoid the antenna performance being greatly affected.

[0069] Wherein, as mentioned above, the first radiation branch 11 and the second radiation branch 21 are both in the shape of straight bars, the third radiation branch 31 and the fourth radiation branch 41 are approximately L-shaped, the first branch portion 311 and the third branch portion 312 included in the third radiation branch 31 are both in the shape of straight bars, and the second branch portion 411 and the fourth branch portion 412 included in the fourth radiation branch 41 are also in the shape of straight bars. In some embodiments, the size of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 is the size in the length direction of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41. Wherein, the length direction of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 is the extension direction of the long side of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41. For example, the length direction of the first radiating branch 11 is the extension direction of the longest side of the first radiating branch 11, that is, the direction parallel to the first side; and the length direction of the third radiating branch 31 includes the extension direction of the longest long side of the first branch part 311 and the extension direction of the longest long side of the third branch part 312, that is, the direction parallel to the fourth side B4 and the direction parallel to the first side B1.

[0070] In some embodiments, since the equivalent electrical lengths of the first matching unit M1 and the second matching unit M2 account for a large proportion of the target electrical length, the lengths of the first radiation branch 11 and the second radiation branch 21 may be less than 25 mm (millimeter), for example, 20 mm, which can effectively save space.

[0071] Among them, the directional terms such as "top" and "bottom" used in the embodiments of the present application to describe the electronic device 100 are mainly explained based on the orientation of the electronic device 100 when the user holds it in hand. The position toward the top side of the electronic device 100 is the "top", and the position toward the bottom side of the electronic device 100 is the "bottom". It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the orientation of the electronic device 100 in actual application scenarios. In some embodiments, the bottom end of the electronic device 100 is the end where the headphone jack and the USB port are provided, and the top of the electronic device 100 is the other end opposite to the end where the headphone jack and the USB port are provided, and may also refer to the end where a camera, a receiver, etc. are provided.

[0072] in, Figure 4It is mainly for illustrating the overall layout of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3, the fourth antenna unit 4 and the ground plane 5 in the electronic device 100. Figure 4 Specifically, the internal structure of the electronic device 100 is Figure 3 The structure of is shown as an example. Obviously, Figure 4 The electronic device 100 shown in FIG. 1 may also include Figure 1-Figure 2 The internal structure shown, or as described below Figure 5 The internal structure is shown.

[0073] See also Figure 5 , which is another simple structural diagram illustrating part of the internal structure of the electronic device 100 in some embodiments of the present application.

[0074] Among them, Figure 5 As shown, in some embodiments, the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 may all be monopole antennas, and both ends of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are open ends. Among them, the first matching unit M1 included in the first antenna unit 1, the second matching unit M2 included in the second antenna unit 2, the third matching unit M3 included in the third antenna unit 3 and the fourth matching unit M4 included in the fourth antenna unit M4 may all be strong matching units, that is, the equivalent electrical length may be longer, so that the sizes of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 may all be smaller, which can effectively reduce the space occupied by the electronic device 100.

[0075] Among them, Figure 5 As shown, the third radiating branch 31 may only include a first branch portion 311 adjacent to and parallel to the fourth side B4, and the fourth radiating branch 41 may only include a second branch portion 411 adjacent to and parallel to the second side B2, and the second branch portion 411 is close to the fourth side B4.

[0076] Thus, the third radiating branch 31 is entirely located on one side of the fourth side B4, and the fourth radiating branch is entirely located on one side of the second side B2 and close to the fourth side B4. As mentioned above, the fourth side B4 of the ground plate 5 is located at the bottom D2 of the electronic device 100. Therefore, the third radiating branch 31 and the fourth radiating branch 41 are entirely arranged at the bottom D2 of the electronic device 100 or at a position close to the bottom D2. In this case, the possibility of being held by the user is also small.

[0077] Among them, Figure 1-Figure 4 The same as the figure, the first radiation branch 11 is adjacent to the first side B1 and parallel to the first side B1, the second radiation branch 21 is adjacent to the second side B2 and parallel to the second side B2, the first radiation branch 11 and the second radiation branch 21 are close to the third side B3, and the first feeding point F1 is located at the position of the first radiation branch 11 close to the third side B3, and the second feeding point F2 is located at the position of the second radiation branch 21 close to the third side B3. Similarly, Figure 2 As shown, the ground plate 5 generates a first longitudinal current I11 along the direction from the third side B3 to the fourth side B4 and a first transverse current I21 along the direction from the first side B1 to the second side B2 under the coupling excitation of the first radiation branch 11, and generates a first longitudinal current I11 along the direction from the third side B3 to the fourth side B4 and a second transverse current I22 along the direction from the second side B2 to the first side B1 under the coupling excitation of the second radiation branch 21. The third feeding point F3 is arranged at the first branch part 311, and the fourth feeding point F4 is arranged at the second branch part 411. The ground plate 5 mainly generates a second longitudinal current I12 along the direction from the fourth side B4 to the third side B3 under the coupling excitation of the third radiation branch 31, and the ground plate 5 mainly generates a second transverse current I22 along the direction from the second side B2 to the first side B1 under the coupling excitation of the fourth radiation branch 41.

[0078] Thus, in Figure 5 Under the structure shown, the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the second radiation branch 21 can also respectively couple and excite the grounding plate 5 to generate corresponding currents, and the directions of the currents generated by the coupling excitation of the grounding plate 5 by different radiation branches are at least partially different, so that the main radiation directions of the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are different.

[0079] Among them, Figure 5 As shown, when the third antenna unit 3 and the fourth antenna unit 4 are also monopole antennas, the third matching unit M3 is specifically connected between the third feed source 32 and the third feeding point F3, and the fourth matching unit M4 is specifically connected between the fourth feed source 42 and the fourth feeding point F4.

[0080] in, Figure 5It is only for the purpose of illustrating that the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 may also be other antenna forms. In the present application, the first antenna unit 1 and the second antenna unit 2 are monopole antennas, the third antenna unit 3 and the fourth antenna unit 4 are inverted F antennas, and the first matching unit M1 and the second matching unit M2 are strong matching units, while the third matching unit M3 and the fourth matching unit M4 are weak matching units.

[0081] In some embodiments, the first matching unit M1, the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 are all adjustable matching units. Among them, the equivalent electrical length of the first radiation branch 11 can be changed under the cooperation of the first matching unit M1, so that the frequency band of the electromagnetic wave signal supported for transmission and reception can be changed, the equivalent electrical length of the second radiation branch 21 can be changed under the cooperation of the second matching unit M2, so that the frequency band of the electromagnetic wave signal supported for transmission and reception can be changed, the equivalent electrical length of the third radiation branch 31 can be changed under the cooperation of the third matching unit M3, so that the frequency band of the electromagnetic wave signal supported for transmission and reception can be changed, and the equivalent electrical length of the fourth radiation branch 41 can be changed under the cooperation of the fourth matching unit M4, so that the frequency band of the electromagnetic wave signal supported for transmission and reception can be changed.

[0082] That is, in some embodiments, the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 all include an adjustable matching unit, and the adjustable matching unit can change the final equivalent electrical length of the radiation branches included in the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4, so that the frequency band of the electromagnetic wave signals received and transmitted supported by the radiation branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 is changed, thereby supporting the reception and transmission of electromagnetic wave signals in multiple frequency bands.

[0083] Among them, after the frequency band of the electromagnetic wave signal supported by the radiation branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 is changed, the frequency band of the electromagnetic wave signal supported by the radiation branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 is still the same. For example, the frequency band of the electromagnetic wave signal supported by the radiation branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 was originally band 1, and after being adjusted by their respective adjustable matching units to change the frequency band of the electromagnetic wave signal supported for transmission and reception, they are all changed to band 2, so that the radiation branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 can still form a MIMO antenna system of the corresponding frequency band, so that a MIMO antenna system of different frequency bands can be formed as needed, which can effectively improve the communication performance in multiple frequency bands. Through the aforementioned structure, the main radiation directions of the radiation branches of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 are different. Therefore, even if the frequency bands of the electromagnetic wave signals are the same, they can still ensure good isolation from each other to ensure antenna performance.

[0084] See also Figure 6 , is a schematic diagram of the internal structure of the first matching unit M1 or the second matching unit M2 in some embodiments of the present application. In some embodiments, when the first matching unit M1 and the second matching unit M2 are strong matching units, the first matching unit M1 and the second matching unit M2 both include a plurality of series inductors L1 connected in series between the corresponding feeding point and the corresponding feed source, a feed end inductor L2 connected between the corresponding feed source and the ground, and a switch module S1, wherein the switch module S1 is located between the plurality of series inductors L1 and the feed source, and is used to change the connection relationship between the plurality of series inductors L1 and the feed source to change the matching parameter value of the corresponding first matching unit M1 or the second matching unit M2, so that the equivalent electrical length of the first radiation branch 11 changes under the cooperation of the first matching unit M1, or the equivalent electrical length of the second radiation branch 21 changes under the cooperation of the second matching unit M2.

[0085] That is, in some embodiments, when the first matching unit M1 and the second matching unit M2 are strong matching units, strong matching can be achieved through the above structure, that is, the equivalent electrical length is large, and the electrical length can also be adjusted, so that the electrical length of the corresponding radiation branch can be switched to the electrical length corresponding to other frequency bands. In some embodiments, the multiple series inductors L1 can be inductors with large inductance values, which can be equivalent to a larger electrical length.

[0086] in, Figure 6Specifically, the first matching unit M1 is used as an example for illustration. That is, the first matching unit M1 includes a plurality of series inductors L1 connected in series between the first feeding point F1 and the first feed source 12, a feed end inductor L2 connected between the first feed source 12 and the ground, and a switch module S1, wherein the switch module S1 is located between the plurality of series inductors L1 and the first feed source 12, and is used to change the connection relationship between the plurality of series inductors L1 and the first feed source 12 to change the corresponding matching parameter value of the first matching unit M1, so that the equivalent electrical length of the first radiation branch 11 changes under the cooperation of the first matching unit M1.

[0087] The first matching unit M1 and the second matching unit M2 both include inductors, and the matching parameter value may specifically be an inductance value.

[0088] Among them, Figure 6 As shown, the plurality of series inductors L1 include a first series inductor L11, a second series inductor L12 and a third series inductor L13, and the switch module S1 at least includes a first connection node N1 and a corresponding feed source (ie Figure 6 The first switch S11 between the first feed source 12 shown in the figure and the second switch S12 connected between the second connection node N2 and the feed source, the first connection node N1 is the connection node between the first series inductor L11 and the second series inductor L12, and the second connection node N2 is the connection node between the second series inductor L12 and the third series inductor L13. The switch module S1 can be in at least a first switch state, a second switch state and a third switch state. In the first switch state, only the first switch S11 is turned on and the second series inductor L12 and the third series inductor L13 are short-circuited, so that the feed point (i.e. Figure 6The series inductance between the first feeding point F1) and the feed source is the first series inductance L11, and the matching parameter value of the corresponding first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductance L1 and the feed end inductance L2. In the second switch state, only the second switch S12 is turned on and the third series inductor L13 is short-circuited, so that the series inductance connected between the feeding point and the feed source is the first series inductor L11 and the second series inductor L12, and the matching parameter value of the corresponding first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductor L11 and the second series inductor L12 connected in series with the feed end inductor L2; in the third switch state, the first switch S11, the second switch S12 and the third switch S13 are all disconnected, so that the series inductance connected between the feeding point and the feed source is the first series inductor L11, the second series inductor L12 and the third series inductor L13, and the matching parameter value of the corresponding first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductor L11, the second series inductor L12 and the third series inductor L13 connected in series with the feed end inductor L2.

[0089] Among them, as mentioned above, Figure 6 Specifically, the first matching unit M1 is used as an example for illustration. The aforementioned feed source is Figure 6 The first feed source 12 shown in FIG. 1 , the aforementioned feed point is Figure 6 The first feeding point F1 is shown. Obviously, when the structure of the second matching unit M2 is used, the aforementioned feed source is the second feed source 22, and the aforementioned feeding point is the second feeding point F2.

[0090] Thus, in some embodiments, the switch module S1 can be in at least a first switch state, a second switch state, and a third switch state, so that the electrical length of the corresponding first radiation branch 11 or the second radiation branch 21 can be changed to at least three different electrical lengths, and can at least support the transmission and reception of electromagnetic wave signals in at least three different frequency bands.

[0091] In some embodiments, the frequency bands of electromagnetic wave signals supported by the first radiation branch 11 and the second radiation branch 21 for transmission and reception include at least a first frequency band, a second frequency band, and a third frequency band. When the switch module S1 of the first matching unit M1 and the second matching unit M2 are respectively in the first switching state, the second switching state, the third switching state, and the fourth switching state, the frequency bands supported by the first radiation branch 11 and the second radiation branch 21 are respectively the first frequency band, the second frequency band, and the third frequency band, wherein the first frequency band is higher than the second frequency band, and the second frequency band is higher than the third frequency band.

[0092] That is, as mentioned above, when the switch module S1 is in the first switch state, the series inductance connected between the corresponding feeding point and the feed source is the first series inductance L11, and the corresponding matching parameter value of the first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductance L1 and the feed end inductance L2; when the switch module S1 is in the second switch state, the series inductance connected between the feeding point and the feed source is the first series inductance L11 and the second series inductance L12, and the corresponding matching parameter value of the first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductance L1 and the feed end inductance L2. The matching parameter value is the parallel value of the first series inductance L1 and the second series inductance L12 connected in series and the feed end inductance L2; and when the switch module S1 is in the third switch state, the series inductance connected between the feed point and the feed source is the first series inductance L11, the second series inductance L12 and the third series inductance L13, and the corresponding matching parameter value of the first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductance L1, the second series inductance L12 and the third series inductance L13 connected in series and the feed end inductance L2. Since the value of the feed end inductance L2 does not change, the total inductance value of the first matching unit M1 and the second matching unit M2 gradually increases when the switch module S1 changes from the first switch state, the second switch state to the third switch state, and the equivalent electrical length increases, and the frequency band corresponding to a longer wavelength, that is, the lower frequency band, therefore, the first frequency band is higher than the second frequency band, and the second frequency band is higher than the third frequency band.

[0093] Thus, through Figure 6 In the structure shown, the first matching unit M1 and the second matching unit M2 can achieve strong matching, that is, the equivalent electrical length is large, and the electrical length can also be adjusted, so that the corresponding radiation branches can support at least the first frequency band, the second frequency band and the third frequency band.

[0094] See also Figure 7 , is a further internal structure diagram of the first matching unit M1 or the second matching unit M2 in some embodiments of the present application.

[0095] Among them, Figure 7 As shown, Figure 6 Compared with the structure of the first matching unit M1 or the second matching unit M2 shown in FIG. 1 , the first matching unit M1 and the second matching unit M2 further include at least one grounding inductor L3, and the switch module S1 may be located between the plurality of series inductors L1, the at least one grounding inductor L3, and the corresponding feed source (e.g. Figure 6The first feed source 12 shown in the figure is used to change the connection relationship between the multiple series inductors L1 and / or at least one ground inductor L3 and the feed source to change the corresponding matching parameter value of the first matching unit M1 or the second matching unit M2, so that the equivalent electrical length of the first radiation branch 11 is changed under the cooperation of the first matching unit M1, or the equivalent electrical length of the second radiation branch 21 is changed under the cooperation of the second matching unit M2.

[0096] That is, in some embodiments, the first matching unit M1 and the second matching unit M2 also include at least one grounding inductor L3, and the switch module S1 can further change the matching parameter value of the corresponding first matching unit M1 or the second matching unit M2 by further switching the connection between the at least one grounding inductor L3 and the corresponding feed source, so that the equivalent electrical length of the first radiation branch 11 is changed with the cooperation of the first matching unit M1, or the equivalent electrical length of the second radiation branch 21 is changed with the cooperation of the second matching unit M2, thereby supporting more frequency bands.

[0097] Among them, Figure 7 As shown, the at least one grounding inductor L3 at least includes a first grounding inductor L31, and the switch module S1 also includes a third switch S13 connected between the remote end of the first grounding inductor L31 and the feed source, wherein the switch module S1 can also be in a fourth switch state, in which the second switch S12 and the third switch S3 are turned on, so that the series inductor L1 connected between the feeding point and the feed source is the first series inductor L11 and the second series inductor L12, and the first grounding inductor L31 is connected between the feed source and the ground, and is connected in parallel with the feed end inductor L2 and the series first series inductor L11 and the second series inductor L12.

[0098] In some embodiments, the frequency band of electromagnetic wave signals supported for transmission and reception by the first radiation branch 11 and the second radiation branch 21 also includes a fourth frequency band. When the switch module S1 of the first matching unit M1 and the second matching unit M2 is in the fourth switching state, the frequency band supported by the first radiation branch 11 and the second radiation branch 21 is the fourth frequency band, wherein the fourth frequency band is higher than the second frequency band and lower than the first frequency band.

[0099] Among them, since the first grounding inductor L21 is connected between the feed source and the ground, it is equivalent to connecting the first grounding inductor L21 to the ground in parallel on the basis of the second frequency band supported by the corresponding radiation branch, that is, the first grounding inductor L21 is connected in parallel with the feed end inductor L2 and the first series inductor L11 and the second series inductor L12, so that the equivalent inductance value of the first matching unit M1 and the second matching unit M2 is slightly reduced, and the electrical length is slightly reduced, corresponding to a frequency band slightly higher than the second frequency band. Therefore, the fourth frequency band is higher than the second frequency band and lower than the first frequency band.

[0100] in, Figure 7 The first matching unit M1 is also used as an example for illustration. Figure 7 The first feed 12 is shown in FIG. Figure 7 and Figure 6 The difference is that it further includes the ground inductor L2. For other structures, please refer to Figure 6 Related content.

[0101] Among them, in this application, "A" frequency band is higher than "B" frequency band means that the center frequency of "A" frequency band is higher than the center frequency of "B" frequency band, or the maximum frequency value of the frequency range corresponding to "A" frequency band is greater than the maximum frequency value of the frequency range corresponding to "B" frequency band, and the minimum frequency value of the frequency range corresponding to "A" frequency band is greater than the minimum frequency of the frequency range corresponding to "B" frequency band. Correspondingly, "A" frequency band is lower than "B" frequency band means that the center frequency of "A" frequency band is lower than the center frequency of "B" frequency band, or the maximum frequency value of the frequency range corresponding to "A" frequency band is less than the maximum frequency value of the frequency range corresponding to "B" frequency band, and the minimum frequency value of the frequency range corresponding to "A" frequency band is less than the minimum frequency of the frequency range corresponding to "B" frequency band. In some embodiments, the first frequency band, the second frequency band, the third frequency band and the fourth frequency band are all low frequency bands, and are respectively N8 frequency band (880MHz~960MHz), N20 frequency band (791MHz~862MHz), N28 frequency band (700MHz~800MHz), and N5 frequency band (824MHz~896MHz). Among them, N8 frequency band, N20 frequency band, N28 frequency band and N5 frequency band are the names of frequency bands in 5G communication networks, and are also called B8 frequency band, B20 frequency band, B28 frequency band and B5 frequency band in 4G communication networks.

[0102] That is, in some embodiments, the frequency bands of electromagnetic wave signals supported by the first radiation branch 11 and the second radiation branch 21 for transmission and reception are both low-frequency bands, and can be switched between different low-frequency bands in conjunction with the corresponding adjustable matching unit, thereby effectively realizing a low-frequency MIMO antenna system and improving low-frequency communication performance. Obviously, in some embodiments, the first frequency band, the second frequency band, the third frequency band, and the fourth frequency band may also be other frequency bands, for example, multiple medium and high frequency bands or multiple high frequency bands.

[0103] Among them, in the present application, the electrical length of the corresponding adjustable matching unit of the radiating branch corresponds to a certain frequency band, which specifically refers to the electrical length corresponding to the wavelength corresponding to the center frequency of the frequency band, for example, 1 / 4 of the wavelength corresponding to the center frequency of the frequency band.

[0104] Obviously, when the frequency bands of electromagnetic wave signals supported by the first radiation branch 11 and the second radiation branch 21 for transmission and reception are both low-frequency bands and can be switched between different low-frequency bands in conjunction with the corresponding matching units, the frequency bands of electromagnetic wave signals supported by the third radiation branch 31 and the fourth radiation branch 41 for transmission and reception are also low-frequency bands and can be switched between different low-frequency bands in conjunction with the corresponding matching units. In some embodiments, when the third matching unit M3 and the fourth matching unit M4 included in the third antenna unit 3 are weak matching units, since only a certain adjustment of the electrical length is required without an equivalent larger electrical length, the third matching unit M3 and the fourth matching unit M4 are Figure 6-Figure 7 The different structures of the above figures will be described in detail later.

[0105] Among them, the inductance value of the feed end inductor L2 connected between the first feed source 12 and the ground remains unchanged and is a known value that can be pre-selected and determined. In addition, the inductance values ​​of the first series inductor L11, the second series inductor L12, the third series inductor L13, and the first ground inductor L31 can also be determined in advance according to the total inductance value corresponding to the equivalent electrical length required by the first matching unit M1 or the second matching unit M2 when implementing the N8 frequency band, the total inductance value corresponding to the equivalent electrical length required by the first matching unit M1 or the second matching unit M2 when implementing the N20 frequency band, the total inductance value corresponding to the equivalent electrical length required by the first matching unit M1 or the second matching unit M2 when implementing the N28 frequency band, and the total inductance value corresponding to the equivalent electrical length required by the first matching unit M1 or the second matching unit M2 when implementing the N5 frequency band.

[0106] Among them, Figure 7Taking the structures of the first matching unit M1 and the second matching unit M2 as an example, it is assumed that the inductance values ​​of the first series inductor L11, the second series inductor L12, the third series inductor L13, the first ground inductor L31 and the feed end inductor L2 included in the first matching unit M1 and the second matching unit M2 are L11, L12, L13, L31 and L2 respectively. In the first switch state, only the first switch S11 is turned on and the second series inductor L12 and the third series inductor L13 are short-circuited, so that the series inductance connected between the feeding point and the feed source is the first series inductor L11. At this time, the total inductance value of the first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductor L11 and the feed end inductor L2, that is, L11 / / L2. In the second switch state, only the second switch S12 is turned on and the third series inductor L13 is short-circuited, so that the series inductance connected between the feeding point and the feed source is the first series inductor L11 and the second series inductor L12; at this time, the total inductance value of the first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductor L11 and the second series inductor L12 connected in series with the feed end inductor L2, that is, (L11+L12) / / L2. In the third switch state, the first switch S11, the second switch S12 and the third switch S13 are all disconnected, so that the series inductance connected between the feeding point and the feed source is the first series inductance L11, the second series inductance L12 and the third series inductance L13; at this time, the total inductance value of the first matching unit M1 or the second matching unit M2 is the series inductance value of the first series inductance L11, the second series inductance L12 and the third series inductance L13 connected in series with the feed end inductance L2, that is, (L11+L12+L13) / / L2. In the fourth switch state, the second switch S12 and the third switch S3 are turned on, so that the series inductance connected between the feed point and the feed source is the first series inductance L11 and the second series inductance L12, and the first ground inductance L31 and the feed end inductance L2 are connected in parallel between the feed source and the ground. At this time, the total inductance value of the first matching unit M1 or the second matching unit M2 is the parallel value of the first series inductance L11, the second series inductance L12 connected in series, the feed end inductance L2 and the first ground inductance L31, that is, (L11+L12) / / L2 / / L31. The total inductance value of the first matching unit M1 or the second matching unit M2 is also the matching parameter value of the first matching unit M1 or the second matching unit M2 mentioned above.

[0107] Assume that the total inductance corresponding to the equivalent electrical length required by the first matching unit M1 or the second matching unit M2 when implementing the N8 frequency band is Lt1, the total inductance corresponding to the equivalent electrical length required by the first matching unit M1 or the second matching unit M2 when implementing the N20 frequency band is Lt2, the total inductance corresponding to the equivalent electrical length required by the first matching unit M1 or the second matching unit M2 when implementing the N28 frequency band is Lt3, and the total inductance corresponding to the equivalent electrical length required by the first matching unit M1 or the second matching unit M2 when implementing the N5 frequency band is Lt4. According to the four switching states of the aforementioned switch module S1, the following equations can be obtained:

[0108] (1): L11 / / L2=Lt1;

[0109] (2): (L11+L12) / / L2=Lt2;

[0110] (3): (L11+L12+L13) / / L2=Lt3.

[0111] (4): (L11+L12) / / L2 / / L31=Lt4.

[0112] Among them, Lt1, Lt2, Lt3, Lt4 and L2 are all known values. According to the total electrical length required to realize each frequency band and the electrical length of the corresponding first radiation branch 11 and the second radiation branch 21, the equivalent electrical length required for the first matching unit M1 and the second matching unit M2 in each frequency band can be calculated, and since the relationship between the inductance value and its equivalent electrical length is one-to-one corresponding, the above-mentioned total inductance values ​​Lt1, Lt2, Lt3, Lt4 can be obtained as known values ​​respectively. As mentioned above, the inductance value of the feed end inductor L2 connected between the first feed source 12 and the ground remains unchanged, and is a known value that can be pre-selected and determined. Therefore, the above are four equations with four unknowns, and the inductance values ​​of the first series inductance L11, the second series inductance L12, the third series inductance L13 and the first ground inductance L21 can be obtained by solving. Among them, the above symbol " / / " is a parallel operator.

[0113] Thus, the first matching unit M1 and the second matching unit M2 include Figure 6 The structure shown can achieve strong matching of an equivalent larger electrical length, and can also achieve adjustment between multiple electrical lengths, so that the first radiation branch 11 and the second radiation branch 21 respectively connected to the first matching unit M1 and the second matching unit M2 only need a smaller size, and can support the reception and transmission of electromagnetic wave signals of the corresponding frequency band with the cooperation of the first matching unit M1 and the second matching unit M2, and can switch between multiple frequency bands.

[0114] See also Figure 8 , is a further internal structure diagram of the first matching unit M1 or the second matching unit M2 in some embodiments of the present application. When the first matching unit M1 and the second matching unit M2 are strong matching units, Figure 7 Compared to the structure shown, Figure 8 In the embodiment, the grounding inductor L3 of the first matching unit M1 or the second matching unit M2 further includes a second grounding inductor L32, and the switch module S1 further includes a fourth switch S14 connected between a remote end of the second grounding inductor L32 and the feed source.

[0115] The second ground inductor L32 is mainly used to optimize the transmission and reception states during transmission (TX) and reception (RX), so that better communication performance can be achieved during transmission and reception in each frequency band.

[0116] in, Figure 8 The first matching unit M1 is also used as an example for illustration. Figure 8 The first feed source 12 shown in FIG. Figure 8 Other structures in Figure 7 The corresponding structure is the same as in . For more details, see Figure 7 The relevant description is not repeated here.

[0117] See also Fig. 9 , is a schematic diagram of the internal structure of the third matching unit M3 or the fourth matching unit M4 in some embodiments of the present application.

[0118] In some embodiments, when the third matching unit M3 and the fourth matching unit M4 are weak matching units and adjustable matching units, the third matching unit M3 and the fourth matching unit M4 both include a plurality of matching element branches Z1 connected in parallel between the corresponding feeding point and the feed source, and each matching element branch Z1 includes a matching element M31 and a switch SW connected in series. By enabling different matching element branches Z1, the third matching unit M3 and the fourth matching unit M4 present different matching parameter values ​​as a whole, so that the equivalent electrical length of the third radiation branch 31 is different under the cooperation of the third matching unit M3, and the equivalent electrical length of the fourth radiation branch 41 is different under the cooperation of the fourth matching unit M4.

[0119] In some embodiments, when the switch SW in a matching element branch Z1 is turned on, the matching element branch Z1 is in an enabled state, and when the switch SW in the matching element branch Z1 is turned off, the matching element branch Z1 is in a disabled state. Thus, the matching element branch Z1 can be enabled by controlling the switch SW in the corresponding matching element branch Z1 to be turned on. Different matching element branches Z1 may have different matching parameter values, so that when different matching element branches Z1 are enabled, the third matching unit M3 and the fourth matching unit M4 present different matching parameter values ​​as a whole.

[0120] The matching element M31 included in each matching element branch Z1 may be any combination of inductance and / or capacitance, and the matching parameter value may be capacitance and / or capacitance value. Fig. 9 The matching element M31 is taken as an inductor as an example for illustration.

[0121] Among them, in some embodiments, when the frequency bands of electromagnetic wave signals supported for transmission and reception by the first radiation branch 11 and the second radiation branch 21 include at least the first frequency band, the second frequency band and the third frequency band, the frequency bands of electromagnetic wave signals supported for transmission and reception by the third radiation branch 31 and the fourth radiation branch 41 include at least the first frequency band, the second frequency band and the third frequency band, the third matching unit M3 and the fourth matching unit M4 both include at least three matching element branches Z1 connected in parallel between the corresponding feeding point and the feed source, and when different matching element branches Z1 are enabled, the frequency bands supported by the third radiation branch 31 and the fourth radiation branch 41 are the first frequency band, the second frequency band and the third frequency band, respectively.

[0122] In some embodiments, when the frequency bands of electromagnetic wave signals supported for transmission and reception by the first radiation branch 11 and the second radiation branch 21 include the first frequency band, the second frequency band, the third frequency band and the fourth frequency band, the frequency bands of electromagnetic wave signals supported for transmission and reception by the third radiation branch 31 and the fourth radiation branch 41 also include the first frequency band, the second frequency band, the third frequency band and the fourth frequency band.

[0123] in, Fig. 9 In the figure, it is illustrated by taking the example that the third matching unit M3 and the fourth matching unit M4 both include four matching element branches Z1 connected in parallel between the corresponding feeding points and the feed sources.

[0124] in, Fig. 9 Specifically, the third matching unit M3 is taken as an example for illustration. Fig. 9The feeding point and the feed source shown in are the third feeding point F3 and the third feed source 32. Obviously, when is the structural formula of the fourth matching unit M4, the feeding point and the feed source are the fourth feeding point F4 and the fourth feed source 42 respectively.

[0125] In some embodiments, as mentioned above, the first frequency band, the second frequency band, the third frequency band and the fourth frequency band are all low frequency bands, and are respectively N8, N20, N28 and N5 frequency bands.

[0126] Obviously, in some embodiments, the first radiation branch node 11, the second radiation branch node 21, the third radiation branch node 31 and the fourth radiation branch node 41 may also support other frequency bands, for example, they may support medium and high frequency bands and may switch between multiple medium and high frequency bands, or they may also support high frequency bands and may switch between multiple high frequency bands.

[0127] In some embodiments, the first matching unit M1, the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 may all be matching units with fixed matching parameter values. The equivalent electrical length of the first radiation branch 11 under the cooperation of the first matching unit M1, the equivalent electrical length of the second radiation branch 21 under the cooperation of the second matching unit M2, the equivalent electrical length of the third radiation branch 31 under the cooperation of the third matching unit M3 and the equivalent electrical length of the fourth radiation branch 41 under the cooperation of the fourth matching unit M4 are equal, and all correspond to a fixed frequency band, and all support the transmission and reception of electromagnetic wave signals in the frequency band.

[0128] In some embodiments, the equivalent electrical length of the first matching unit M1 and the second matching unit M2 is greater than the equivalent electrical length of the third matching unit M3 and the fourth matching unit M3. Therefore, the electrical length of the first radiation branch 11 and the second radiation branch 21 itself will be smaller than the electrical length of the third radiation branch 31 and the fourth radiation branch 41. For radiation branches with more regular shapes, the electrical length is often proportional to the size. Therefore, the size of the first radiation branch 11 and the second radiation branch 21 is also smaller than the size of the third radiation branch 31 and the fourth radiation branch 41.

[0129] That is, in some embodiments, the first matching unit M1, the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 may also be matching units with fixed matching parameter values, and the first matching unit M1 and the second matching unit M2 may be strong matching units, while the third matching unit M3 and the fourth matching unit M4 may be weak matching units.

[0130] See also Fig.10 , is another schematic diagram of the internal structure of the first matching unit M1 or the second matching unit M2 in some embodiments of the present application. Fig.10 The structure shown may be when the first matching unit M1 and the second matching unit M2 are matching units with fixed matching parameter values. The structure of the second matching unit M2 is the same as that of the first matching unit M1. Fig.10 The first matching unit M1 is taken as an example for illustration.

[0131] like Fig.10 As shown, when the first matching unit M1 and the second matching unit M2 are matching units with fixed matching parameter values, the first matching unit M1 and the second matching unit M2 both include a pair of matching units connected in series to the corresponding feeding points (eg Fig.10 The first feeding point F1 in the figure) and the corresponding feed source (e.g. Fig.10 At least one series inductor L1 is connected between the first feed source 12 in the first radiation branch 11 and the feed end inductor L2 connected between the feed source and the ground. As mentioned above, the equivalent electrical length of the first radiation branch 11 in the cooperation of the first matching unit M1 is equal to the equivalent electrical length of the second radiation branch 21 in the cooperation of the second matching unit M2, and corresponds to the frequency band of the electromagnetic wave signal supported by the first radiation branch 11 and the second radiation branch 21 for transmission and reception.

[0132] Thus, effective matching can be achieved through the parallel structure of at least one series inductor L1 connected in series between the corresponding feeding point and the corresponding feeding source and the feeding end inductor L2 connected between the feeding source and the ground.

[0133] The matching parameter values ​​of the first matching unit M1 and the second matching unit M2 are specifically the parallel value of at least one series inductor L1 and a feed-end inductor L2.

[0134] In some embodiments, the at least one series inductor L1 may be the aforementioned first series inductor L11, or may be the aforementioned first series inductor L11 and second series inductor L12, or may be the aforementioned first series inductor L11, second series inductor L12 and third series inductor L13.

[0135] In some embodiments, the frequency band of the electromagnetic wave signal received and transmitted supported by the first radiation branch 11 and the second radiation branch 21 is a low frequency band, and can be any one of the N8, N20, N28, and N5 frequency bands.

[0136] That is, in some embodiments, the equivalent electrical length of the first radiation branch 11 in cooperation with the first matching unit M1, and the effective electrical length of the second radiation branch 21 in cooperation with the second matching unit M2 can correspond to a low-frequency band, and support the transmission and reception of electromagnetic wave signals in a low-frequency band.

[0137] In some embodiments, when the third matching unit M3 and the fourth matching unit M4 are both matching units with fixed matching parameter values ​​and are weak matching units, the third matching unit M3 and the fourth matching unit M4 may only include a matching element M31 connected between the corresponding feeding point and the feed source, and the matching element M31 presents a fixed matching parameter value, so that the equivalent electrical length of the third radiation branch 31 under the cooperation of the third matching unit M3 and the effective electrical length of the fourth radiation branch 41 under the cooperation of the fourth matching unit M4 can correspond to a certain frequency band, and support the reception and transmission of electromagnetic wave signals in a certain frequency band.

[0138] Wherein, when the frequency band of the electromagnetic wave signal supported by the first radiation branch 11 and the second radiation branch 21 for transmission and reception is a low frequency band, and can be any one of the N8, N20, N28, and N5 frequency bands, the frequency band of the electromagnetic wave signal supported by the third radiation branch 31 and the fourth radiation branch 41 for transmission and reception is also a low frequency band, and can be any one of the N8, N20, N28, and N5 frequency bands, and the frequency bands of the electromagnetic wave signal supported by the first radiation branch 11, the second radiation branch 21, the third radiation branch 31, and the fourth radiation branch 41 for transmission and reception are the same. Wherein, as Figure 3 and Figure 4 As shown, the third radiation branch 31 also includes a first grounding point G1, which is located between the first open end P1 and the third feeding point F3, and the fourth radiation branch 41 also includes a second grounding point G2, which is located between the second open end P3 and the fourth feeding point F4. The third matching unit M3 is connected between the first grounding point G1 and the ground, and the fourth matching unit M4 is connected between the second grounding point G2 and the ground. The third antenna unit 3 also includes a fifth matching unit M30, and the fourth antenna unit 4 also includes a sixth matching unit M40. The fifth matching unit M30 is connected between the third feed source 32 and the third feeding point F3, and is used to perform corresponding impedance matching adjustments so that the third radiation branch 31 can better resonate in the current working frequency band, and the sixth matching unit M40 is connected between the fourth feed source 42 and the fourth feeding point F4, and is used to perform corresponding impedance matching adjustments so that the fourth radiation branch 41 can better resonate in the current working frequency band.

[0139] See also Fig.11 , is a schematic diagram of a return loss curve when the first antenna unit 1 or the second antenna unit 2 in the electronic device 100 in some embodiments of the present application works in multiple frequency bands through the corresponding adjustable matching unit. Among them, Fig.11 Specifically, a schematic diagram of a return loss (S parameter) curve is provided by performing simulation tests when the first antenna unit 1 in the electronic device 100 works in multiple low-frequency bands, namely the aforementioned N8, N20, N28, and N5 bands, through corresponding adjustable matching units.

[0140] in, Fig.11 The figure shows the return loss curve S11-1 of the first antenna unit 1 working in the N8 frequency band, the return loss curve S11-2 working in the N20 frequency band, the return loss curve S11-3 working in the N28 frequency band, and the return loss curve S11-4 working in the N5 frequency band. In a certain frequency band, the frequency corresponding to the lowest point of the same input return loss curve is the resonant frequency point. The lower the input return loss, the lower the loss at the resonant frequency, and the higher the antenna radiation efficiency.

[0141] Among them, from Fig.11 It can be seen that the return loss of the first antenna unit 1 when working in the N8 frequency band is approximately -10.5dB, the return loss when working in the N20 frequency band is approximately -8dB, the return loss of the first antenna unit 1 when working in the N28 frequency band is approximately -14.3dB, and the return loss when working in the N5 frequency band is approximately -13.8dB.

[0142] It can be seen that although the first antenna unit 1 is strongly matched by the first matching unit M1 and its size is greatly reduced, its return loss in each frequency band is low and the antenna performance is still good.

[0143] Please also read Figure 12-Figure 15 , Fig.12 It is a schematic diagram of the distribution of the current generated by stimulating the ground plate 5 when the first antenna unit 1 in the electronic device 100 in some embodiments of the present application works alone. Fig.13 It is a schematic diagram of the distribution of the current generated by stimulating the ground plate 5 when the second antenna unit 2 in the electronic device 100 in some embodiments of the present application works alone. Fig.14 It is a schematic diagram of the distribution of the current generated by exciting the ground plate 5 when the third antenna unit 3 in the electronic device 100 in some embodiments of the present application works alone. Fig.15 It is a schematic diagram of the distribution of the current generated by exciting the ground plate 5 when the fourth antenna unit 4 in the electronic device 100 in some embodiments of the present application works alone.

[0144] in, Figure 12-Figure 15The electronic device 100 may include the structure shown in any of the above embodiments, for example Figure 1 , Figure 3 , Figure 5 A schematic diagram of the distribution of the current generated by the grounding plate 5 when the structure is the same as that shown in any of the accompanying drawings.

[0145] As mentioned above, the first radiation branch 11 is adjacent to the first side B1 and parallel to the first side B1, and the first radiation branch 11 is close to the third side B3. Fig.12 As shown, when the first antenna unit 1 works alone, the ground plane 5 generates a first longitudinal current I11 along the direction from the third side B3 to the fourth side B4 and a first transverse current I21 along the direction from the first side B1 to the second side B2 under the coupling excitation of the first radiation branch 11. Fig.12 As shown, the current is mainly concentrated in the junction area between the first side B1 and the third side B3 corresponding to the first radiation branch 11 .

[0146] As mentioned above, the second radiation branch 21 is adjacent to the second side B2 and parallel to the second side B2, and the second radiation branch 21 is close to the third side B3. Fig.13 As shown, when the second antenna unit 2 works alone, the ground plane 5 generates a first longitudinal current I11 along the direction from the third side B3 to the fourth side B4 and a second transverse current I22 along the direction from the second side B2 to the first side B1 under the coupling excitation of the second radiation branch 21. Fig.13 As shown, the current is mainly concentrated in the junction area of ​​the second side B2 and the third side B3 corresponding to the first radiation branch 11.

[0147] As mentioned above, the third radiation branch 31 at least includes a first branch portion 311 adjacent to the fourth side B4 and parallel to the fourth side B4, and the third feeding point F3 is arranged at the first branch portion 311. Fig.14 As shown, when the third antenna unit 3 works alone, the ground plane 5 mainly generates a second longitudinal current I12 along the direction from the fourth side B4 to the third side B3 under the coupling excitation of the third radiation branch 31. Fig.14 As shown, the current is mainly concentrated in the boundary area between the fourth side B4 corresponding to the third radiation branch 31 and the first side B1.

[0148] As mentioned above, the fourth radiation branch 41 at least includes a second branch portion 411 adjacent to the second side B2 and parallel to the second side B2, and the fourth feeding point F4 is arranged at the second branch portion 411. Fig.15As shown, when the fourth antenna unit 4 works alone, the ground plane 5 mainly generates a second transverse current I22 along the direction from the second side B2 to the first side B1 under the coupling excitation of the fourth radiation branch 41. Fig.15 As shown, the current is mainly concentrated in the area of ​​the second side B2 corresponding to the fourth radiation branch 31 .

[0149] Please also read Figure 16-Figure 19 , Fig.16 Schematic diagram of antenna radiation direction when the first antenna unit 1 in the electronic device 100 in some embodiments of the present application works alone. Fig.17 Schematic diagram of antenna radiation direction when the second antenna unit 2 in the electronic device 100 in some embodiments of the present application works alone. Fig.18 Schematic diagram of antenna radiation direction when the third antenna unit 3 in the electronic device 100 in some embodiments of the present application works alone. Fig.19 Schematic diagram of the antenna radiation direction when the fourth antenna unit 4 in the electronic device 100 in some embodiments of the present application works alone.

[0150] in, Figure 16-Figure 19 It can be a schematic diagram of antenna radiation directions when each antenna unit works independently, obtained by simulation test when the electronic device 100 includes the structure shown in any of the above embodiments. Figure 3 The structure of the electronic device 100 shown is a schematic diagram of antenna radiation directions when each antenna unit works independently, which is obtained by simulation test.

[0151] in, Figure 16-Figure 19 The darkest area in the image can be regarded as the main radiation direction of the antenna.

[0152] like Fig.16 and Fig.17 As shown, when the first antenna unit 1 works alone, the ground plane 5 generates a first longitudinal current I11 along the direction from the third side B3 to the fourth side B4 and a first transverse current I21 along the direction from the first side B1 to the second side B2 under the coupling excitation of the first radiation branch 11. When the second antenna unit 2 works alone, the ground plane 5 generates a first longitudinal current I11 along the direction from the third side B3 to the fourth side B4 and a second transverse current I22 along the direction from the second side B2 to the first side B1 under the coupling excitation of the second radiation branch 21. Therefore, when the first antenna unit 1 works alone and when the second antenna unit 2 works alone, the transverse currents on the ground plane 5 are opposite, as shown in FIG. Fig.16 and Fig.17As shown, the main radiation direction of the first antenna unit 1 when working alone and the main radiation direction of the second antenna unit 2 when working alone will deviate from each other in the lateral direction so that their respective main radiation directions are different.

[0153] Among them, the horizontal direction in this application refers to the direction parallel to the third side B3 and the fourth side B4, that is, the horizontal direction under the viewing angle of each figure, and the vertical direction in this application refers to the direction parallel to the first side B1 and the second side B2, that is, the vertical direction under the viewing angle of each figure.

[0154] As mentioned above, the direction of the current affects the main radiation direction. In the present application, when the first antenna unit 1 is working and when the second antenna unit 2 is working, the transverse current on the ground plane 5 is opposite, resulting in different main radiation directions. Further, it can also be said that the phase lag directions of the transverse currents are opposite. Since the main radiation direction will shift in the direction of the current phase lag, the main radiation directions of the first antenna unit 1 and the second antenna unit 2 will shift in opposite transverse directions when they are working, resulting in different main radiation directions.

[0155] Among them, Fig.18 As shown, when the third antenna unit 3 works alone, the ground plate 5 mainly generates the second longitudinal current I12 along the direction from the fourth side B4 to the third side B3 under the coupling excitation of the third radiation branch 31, so the radiation direction of the third antenna unit 3 will also shift along the direction from the fourth side B4 to the third side B3. Similarly, it can also be said that the phase lag direction of the second longitudinal current I12 along the direction from the fourth side B4 to the third side B3 generated by the ground plate 5 under the coupling excitation of the third radiation branch 31 is along the direction from the fourth side B4 to the third side B3, so that the main radiation direction of the third antenna unit 3 is shifted along the direction from the fourth side B4 to the third side B3.

[0156] Among them, Fig.16 As shown, when the fourth antenna unit 4 works alone, the ground plane 5 mainly generates the second transverse current I22 along the second side B2 to the first side B1 under the coupling excitation of the fourth radiation branch 41, so the radiation direction of the fourth antenna unit 4 will also shift along the second side B2 to the first side B1. Similarly, it can also be said that the phase lag direction of the second transverse current I22 mainly generated by the ground plane 5 along the second side B2 to the first side B1 under the coupling excitation of the fourth radiation branch 41 is along the second side B2 to the first side B1, so that the main radiation direction of the fourth antenna unit 4 is shifted along the second side B2 to the first side B1.

[0157] See also Fig. 20, is a schematic diagram of an envelope correlation coefficient (ECC) curve between two of four antenna units of the electronic device 100 in some embodiments of the present application. Among them, Fig. 20 It can also be a schematic diagram of envelope correlation coefficients between two of the four antenna units obtained by simulation test when the electronic device 100 includes the structure shown in any of the above embodiments. Figure 3 The structure of the electronic device 100 shown is a schematic diagram of envelope correlation coefficients between two of the four antenna units obtained by simulation testing.

[0158] The envelope correlation coefficient (ECC) represents the similarity of the envelope, that is, the radiation pattern, between two antennas with the same frequency. The lower the envelope correlation coefficient, the less similar the radiation patterns of the two antennas with the same frequency are, that is, the higher the isolation is.

[0159] in, Fig. 20 The figure illustrates the envelope correlation coefficient curve Sb1 between the first antenna unit 1 and the second antenna unit 2, the envelope correlation coefficient curve Sb2 between the first antenna unit 1 and the third antenna unit 3, the envelope correlation coefficient curve Sb3 between the first antenna unit 1 and the fourth antenna unit 4, the envelope correlation coefficient curve Sb4 between the second antenna unit 2 and the third antenna unit 3, the envelope correlation coefficient curve Sb5 between the second antenna unit 2 and the fourth antenna unit 4, and the envelope correlation coefficient curve Sb6 between the third antenna unit 3 and the fourth antenna unit 4.

[0160] from Fig. 20 It can be seen that the envelope correlation coefficients between the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 are all low, all lower than 0.7dB, which is already very low. Therefore, the envelope correlation coefficient also reflects that the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the third antenna unit 3 of the electronic device 100 of the present application are highly isolated from each other, and the interference between them is very small.

[0161] in, Fig. 20 Further, a simulation test is performed by taking the frequency band of the electromagnetic wave signals supported for transmission and reception by the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 as the N28 frequency band as an example.

[0162] See also Fig.21 , is a schematic diagram of a system total efficiency curve of four antenna units of the electronic device 100 in some embodiments of the present application. Among them, Fig.21 It may also be a schematic diagram of a system total efficiency curve of four antenna units obtained by simulation test when the electronic device 100 includes the structure shown in any of the above embodiments. Figure 3The schematic diagram of the total system efficiency curve of the four antenna units obtained by simulation test of the structure of the electronic device 100 shown in FIG. Fig.21 The simulation test may be performed by taking the frequency band of the electromagnetic wave signals supported for transmission and reception by the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 as the N28 frequency band.

[0163] in, Fig.21 The system total efficiency curve St1 of the first antenna unit 1 , the system total efficiency curve St2 of the second antenna unit 2 , the system total efficiency curve St3 of the third antenna unit 3 , and the system total efficiency curve St4 of the fourth antenna unit 4 are illustrated.

[0164] like Fig.21 As shown, the resonant frequency of the N28 frequency band is approximately at 0.75 GHz. At the resonant frequency, the total system efficiency of the first antenna unit 1 is approximately -7.9 dB, the total system efficiency of the second antenna unit 2 is approximately -8.3 dB, the total system efficiency of the third antenna unit 3 is approximately -4.9 dB, and the total system efficiency of the fourth antenna unit 4 is approximately -5.8 dB.

[0165] It can be seen that in Figure 3 In the structure of the figure, since the first radiating branch 11 of the first antenna unit 1 and the second radiating branch 21 of the second antenna unit 2 are made by strong matching units to meet the electrical length requirements and thus have a smaller size, the overall system efficiency will decrease to a certain extent compared to the third antenna unit 3 and the fourth antenna unit 4 which respectively include the third radiating branch 31 and the fourth radiating branch 41 which have larger sizes, but it is still better overall and can still achieve better antenna performance.

[0166] Among them, as mentioned above Figure 1-Figure 5 As shown, the electronic device includes a middle frame 6, wherein the aforementioned grounding plate 5 is at least a partial area in the middle frame 6. In some embodiments, the grounding plate 5 may specifically be the middle frame 6, or a partial area isolated by a gap in the middle frame 6. For example, the aforementioned grounding plate 5 may be the middle frame 6.

[0167] Among them, when the grounding plate 5 is a partial area isolated by a gap in the middle frame 6, the partial area serving as the grounding plate 5 is electrically isolated from other areas, and an insulating material is filled between the grounding plate 5 and other areas to maintain the structural stability of the entire middle frame 6.

[0168] In general, the middle frame 6 of the electronic device 100 is made of metal material and is the whole ground of the electronic device 100. Therefore, in some embodiments of the present application, at least a part of the middle frame 6 can be reused as a ground plane 5 to stimulate the middle frame 6 to generate a corresponding current, so that the main radiation directions of the first antenna unit 1, the second antenna unit 2, the third antenna unit 3 and the fourth antenna unit 4 are different, thereby avoiding interference with each other.

[0169] Please also read Fig. 22 , is another overall plan view of the electronic device 100 in some embodiments of the present application. Fig. 22 As shown, the electronic device 100 also includes a mainboard 8. The first feed source 12, the second feed source 22, the third feed source 32, the fourth feed source 42, etc. mentioned above can be arranged on the mainboard 8. And, when the electronic device 100 also includes the first matching unit M1, the second matching unit M2, the third matching unit M3, the fourth matching unit M4, the fifth matching unit M30 and the sixth matching unit M40, the first matching unit M1, the second matching unit M2, the third matching unit M3, the fourth matching unit M4, the fifth matching unit M30 and the sixth matching unit M40 can also be arranged on the mainboard 8. Fig. 22 It is just a simple illustration, and for the sake of convenience, some feed sources and matching units are not located on the main board 8.

[0170] In some embodiments, the grounding plate 5 is also at least a partial area of ​​the grounding layer in the mainboard 8. That is, in some embodiments, the grounding plate 5 can be specifically the grounding layer in the mainboard 8, or a partial area of ​​the grounding layer in the mainboard 8 isolated by a gap.

[0171] When the grounding plate 5 is a partial area isolated by a gap in the grounding layer of the mainboard 8, the partial area serving as the grounding plate 5 is electrically isolated from other areas, and an insulating material is filled between the partial area and other areas.

[0172] Please also read Figure 4 as well as Fig. 22 .like Figure 4 and Fig. 22 As shown, in some embodiments, the electronic device 100 includes a frame 9 , and the first radiation branch 11 , the second radiation branch 21 , the third radiation branch 31 and the fourth radiation branch 41 are metal segments arranged in the frame 9 .

[0173] In some embodiments, Figure 4 and Fig.21As shown, the frame 9 may be a metal frame, and the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 may be metal frame segments 90 formed by opening gaps X1 in the metal frame.

[0174] In some embodiments, the frame 9 of the electronic device 100 may also be a non-metal frame, and the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 may be metal segments arranged in the frame 9 of the electronic device 100.

[0175] That is, in some embodiments, the frame 9 of the electronic device 100 may also be a non-metal frame with low conductivity such as plastic, ceramic, etc. The first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are metal segments arranged in the frame 9 of the electronic device 100, for example, metal segments attached to the inner wall of the frame 9 of the electronic device 100.

[0176] That is, in some embodiments of the present application, the first radiation branch 11 , the second radiation branch 21 , the third radiation branch 31 and the fourth radiation branch 41 can be directly formed by the frame 9 , or supported and fixed on the frame 9 .

[0177] Among them, Figure 4 and Fig. 22 As shown, the electronic device 100 may also include other radiating branches 10 included in other antenna units, wherein these other radiating branches may be directly formed by the frame 9, or supported and fixed on the frame 9, and arranged at intervals with adjacent radiating branches, such as the first radiating branch 11, the second radiating branch 21, the third radiating branch 31 and the fourth radiating branch 41.

[0178] In some embodiments, the electronic device 100 may also include an antenna bracket, which is made of insulating material. The first radiating branch 11, the second radiating branch 21, the third radiating branch 31 and the fourth radiating branch 41 may also be fixed on the corresponding antenna bracket and fixed to the corresponding position of the electronic device near the frame 9 through the antenna bracket.

[0179] In some embodiments, the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 can be an FPC (flexible printed circuit) fixedly arranged on the antenna bracket or an LDS (Laser-Direct-structuring) metal segment formed on the antenna bracket by laser technology, or a PDS metal segment formed on the antenna bracket by PDS (Printing Direct Structure) technology (for example, a metal segment is formed by printing conductive ink, conductive silver paste, etc. on the antenna bracket), and fixed in the electronic device 100 through the antenna bracket.

[0180] In some embodiments, the first radiation branch 11 can be arranged at a position close to the third side B3 of the first side B1 of the ground plate 5 through an antenna bracket, and the second radiation branch 21 can be arranged at a position close to the third side B3 of the second side B2 of the ground plate 5 through an antenna bracket. When the third radiation branch 31 includes both the first branch portion 311 and the third branch portion 312, the third radiation branch 31 can also be arranged at a position close to the first side B1 of the fourth side B4 of the ground plate 5 and at a position close to the fourth side B4 of the first side B1 through an antenna bracket, that is, roughly arranged at the vertex position where the fourth side B4 and the first side B1 intersect. When the fourth radiation branch 41 includes both the second branch portion 411 and the fourth branch portion 412, the fourth radiation branch 41 can also be arranged at a position close to the second side B2 of the fourth side B4 of the ground plate 5 and at a position close to the fourth side B4 of the second side B2 through an antenna bracket, that is, roughly arranged at the vertex position where the fourth side B4 and the second side B2 intersect.

[0181] Among them, when the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are arranged at the corresponding edge of the grounding plate 5, the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 can be arranged on the antenna bracket after being arranged, and the corresponding antenna bracket provided with the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 can be spaced apart from the corresponding edge of the grounding plate 5, or the first radiation branch 11, the second radiation branch 21, the third radiation branch 31 and the fourth radiation branch 41 are attached to the corresponding edge of the grounding plate 5 through the antenna bracket, and are spaced apart from the corresponding edge of the grounding plate 5 through the antenna bracket.

[0182] The electronic device 100 also includes a memory, a battery, etc., which are irrelevant to the improvement of the present application and will not be described in detail.

[0183] The electronic device 100 of the present application may be a mobile phone, a tablet computer, a laptop computer or other electronic device.

[0184] The electronic device 100 of the present application can form a MIMO antenna system through four antenna units, which can effectively improve the communication performance of a specific frequency band, and because the main radiation directions of the four radiation branches of the four antenna units are different, the interference between each other will be small, and the isolation requirements are met, so that the overall antenna communication performance can be effectively improved. In addition, the four antenna units of the electronic device 100 of the present application can switch the frequency bands of the electromagnetic wave signals supported for transmission and reception by respectively including four adjustable matching units, and can realize a MIMO antenna system of multiple frequency bands.

[0185] Among them, each embodiment of the present application has its own focus. In some embodiments, there is no structure that is described in detail. If there is no conflict, reference can be made to the contents of the corresponding structure in other embodiments.

[0186] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application; in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An electronic device with communication function, characterized in that: The electronic device comprises: A first antenna unit, comprising a first radiating branch and a first feed source, wherein the first radiating branch comprises a first feeding point, the first feeding point is connected to the first feed source, and the first radiating branch supports the transmission and reception of electromagnetic wave signals under the excitation of the first feed source; A second antenna unit includes a second radiating branch and a second feed source, the second radiating branch includes a second feeding point, the second feeding point is connected to the second feed source, and the second radiating branch supports the transmission and reception of electromagnetic wave signals under the excitation of the second feed source; a third antenna unit, comprising a third radiating branch and a third feed source, wherein the third radiating branch comprises a third feeding point, the third feeding point is connected to the third feed source, and the third radiating branch supports the transmission and reception of electromagnetic wave signals under the excitation of the third feed source; a fourth antenna unit, comprising a fourth radiating branch and a fourth feed source, wherein the fourth radiating branch comprises a fourth feeding point, the fourth feeding point is connected to the fourth feed source, and the fourth radiating branch supports the transmission and reception of electromagnetic wave signals under the excitation of the fourth feed source; Ground plate; Among them, the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch are arranged at different positions close to the grounding plate and are spaced from each other. The first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch respectively couple and excite the grounding plate to generate corresponding currents, and the directions of the currents generated by the coupling excitation of the grounding plate by different radiation branches are at least partially different, so that the main radiation directions of the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch are different. Among them, at the same time, the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch support the same frequency band of electromagnetic wave signals for transmission and reception, thereby forming a MIMO antenna system.

2. The electronic device according to claim 1, characterized in that: The ground plate includes a first side and a second side relative to each other and a third side and a fourth side relative to each other, the first radiation branch is adjacent to the first side and is parallel to the first side, the second radiation branch is adjacent to the second side and is parallel to the second side, the first radiation branch and the second radiation branch are close to the third side, and the first feeding point is located at a position of the first radiation branch close to the third side, and the second feeding point is located at a position of the second radiation branch close to the third side; the ground plate generates a first longitudinal current in a direction from the third side to the fourth side and a first transverse current in a direction from the first side to the second side under coupling excitation of the first radiation branch, and generates a first longitudinal current in a direction from the third side to the fourth side and a first transverse current in a direction from the first side to the second side under coupling excitation of the second radiation branch. The first longitudinal current is generated along the direction from the third side to the fourth side and the second transverse current is generated along the direction from the second side to the first side; the third radiation branch at least includes a first branch portion adjacent to the fourth side and parallel to the fourth side, the fourth radiation branch at least includes a second branch portion adjacent to the second side and parallel to the second side, the third feeding point is arranged at the first branch portion, the fourth feeding point is arranged at the second branch portion, the grounding plate mainly generates a second longitudinal current along the direction from the fourth side to the third side under the coupling excitation of the third radiation branch, and the grounding plate mainly generates a second transverse current along the direction from the second side to the first side under the coupling excitation of the fourth radiation branch.

3. The electronic device according to claim 2, characterized in that: The ground plate is rectangular, the first side and the second side are long sides, and the third side and the fourth side are short sides.

4. The electronic device according to claim 2, characterized in that: The first antenna unit includes a first matching unit connected to the first radiation branch, the second antenna unit includes a second matching unit connected to the second radiation branch, the third antenna unit includes a third matching unit connected to the third radiation branch, and the fourth antenna unit includes a fourth matching unit connected to the fourth radiation branch; wherein, at the same time, the equivalent electrical length of the first radiation branch under the cooperation of the first matching unit, the equivalent electrical length of the second radiation branch under the cooperation of the second matching unit, the equivalent electrical length of the third radiation branch under the cooperation of the third matching unit, and the equivalent electrical length of the fourth radiation branch under the cooperation of the fourth matching unit are equal, so that the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch support the same frequency band of electromagnetic wave signals for transmission and reception.

5. The electronic device according to claim 4, characterized in that: The first antenna unit and the second antenna unit have the same antenna form, and the third antenna unit and the fourth antenna unit have the same antenna form.

6. The electronic device according to claim 5, characterized in that: The first antenna unit and the second antenna unit are monopole antennas, both ends of the first radiating branch and the second radiating branch are open ends, the third antenna unit and the fourth antenna unit are inverted F antennas, the third radiating branch includes a first open end and a first ground end relative to each other, the fourth radiating branch includes a second open end and a second ground end relative to each other, and the first ground end and the second ground end are used for grounding.

7. The electronic device according to claim 6, characterized in that: The third radiating branch also includes a third branch part connected to the first branch part, and the third branch part is adjacent to the first edge and parallel to the first edge; the fourth radiating branch also includes a fourth branch part connected to the second branch part, and the fourth branch part is adjacent to the fourth edge and parallel to the fourth edge, wherein the first open end is the end of the third branch part that is not connected to the first branch part, the first grounding end is the end of the first branch part that is not connected to the third branch part, the second open end is the end of the fourth branch part that is not connected to the second branch part, and the second grounding end is the end of the second branch part that is not connected to the fourth branch part.

8. The electronic device according to claim 7, characterized in that: The first matching unit is connected between the first feed source and the first feeding point, and the second matching unit is connected between the second feed source and the second feeding point; the third radiating branch also includes a first grounding point, which is located between the first open end and the third feeding point, and the fourth radiating branch also includes a second grounding point, which is located between the second open end and the fourth feeding point, the third matching unit is connected between the first grounding point and the ground, and the fourth matching unit is connected between the second grounding point and the ground; wherein the equivalent electrical length of the first matching unit and the second matching unit is greater than the equivalent electrical length of the third matching unit and the fourth matching unit, and the size of the first radiating branch and the second radiating branch is smaller than the size of the third radiating branch and the fourth radiating branch.

9. The electronic device according to any one of claims 4 to 8, characterized in that: The first matching unit, the second matching unit, the third matching unit and the fourth matching unit are adjustable matching units. The equivalent electrical length of the first radiation branch can be changed with the cooperation of the first matching unit, so that the frequency band of the electromagnetic wave signal supported for transmission and reception is changed. The equivalent electrical length of the second radiation branch can be changed with the cooperation of the second matching unit, so that the frequency band of the electromagnetic wave signal supported for transmission and reception is changed. The equivalent electrical length of the third radiation branch can be changed with the cooperation of the third matching unit, so that the frequency band of the electromagnetic wave signal supported for transmission and reception is changed. The equivalent electrical length of the fourth radiation branch can be changed with the cooperation of the fourth matching unit, so that the frequency band of the electromagnetic wave signal supported for transmission and reception is changed.

10. The electronic device according to claim 9, characterized in that: The first matching unit and the second matching unit both include a plurality of series inductors connected in series between corresponding feeding points and corresponding feed sources, a feed-end inductor connected between the corresponding feed source and ground, and a switch module. The switch module is located between the plurality of series inductors and the feed source, and is used to change the connection relationship between the plurality of series inductors and the feed source to change the matching parameter value of the corresponding first matching unit or the second matching unit, so that the equivalent electrical length of the first radiation branch changes with the cooperation of the first matching unit, or the equivalent electrical length of the second radiation branch changes with the cooperation of the second matching unit.

11. The electronic device according to claim 10, characterized in that: The multiple series inductors include a first series inductor, a second series inductor and a third series inductor, the switch module includes at least a first switch connected between a first connection node and the feed source, and a second switch connected between a second connection node and the feed source, the first connection node is a connection node between the first series inductor and the second series inductor, and the second connection node is a connection node between the second series inductor and the third series inductor; wherein the switch module can be in at least a first switch state, a second switch state and a third switch state, in which, in the first switch state, only the first switch is turned on and the second series inductor and the third series inductor are short-circuited, so that the series inductor connected between the feed point and the feed source is the first series inductor, and the corresponding matching parameter value of the first matching unit or the second matching unit is the first series inductor. a parallel value of a series inductor and the feed end inductor; in the second switch state, only the second switch is turned on and the third series inductor is short-circuited, so that the series inductor connected between the feed point and the feed source is the first series inductor and the second series inductor, and the corresponding matching parameter value of the first matching unit or the second matching unit is the parallel value of the first series inductor and the second series inductor connected in series with the feed end inductor; in the third switch state, the first switch, the second switch and the third switch are all disconnected, so that the series inductor connected between the feed point and the feed source is the first series inductor, the second series inductor and the third series inductor, and the corresponding matching parameter value of the first matching unit or the second matching unit is the parallel value of the first series inductor, the second series inductor and the third series inductor connected in series with the feed end inductor.

12. The electronic device according to claim 11, characterized in that: The frequency bands of electromagnetic wave signals supported for transmission and reception by the first radiation branch and the second radiation branch include at least a first frequency band, a second frequency band, and a third frequency band. When the switch modules of the first matching unit and the second matching unit are in the first switch state, the second switch state, and the third switch state, respectively, the frequency bands supported by the first radiation branch and the second radiation branch are the first frequency band, the second frequency band, and the third frequency band, respectively, wherein the first frequency band is higher than the second frequency band, and the second frequency band is higher than the third frequency band.

13. The electronic device according to claim 12, characterized in that: The first matching unit and the second matching unit also include at least one grounding inductor. The switch module is located between the multiple series inductors, the at least one grounding inductor and the feed source, and is used to change the connection relationship between the multiple series inductors and / or at least one grounding inductor and the feed source to change the corresponding matching parameters of the first matching unit or the second matching unit, so that the equivalent electrical length of the first radiation branch is changed under the cooperation of the first matching unit, or the equivalent electrical length of the second radiation branch is changed under the cooperation of the second matching unit.

14. The electronic device according to claim 13, characterized in that: The at least one grounded inductor includes at least a first grounded inductor, and the switch module also includes a third switch connected between the remote end of the first grounded inductor and the feed source, wherein the switch module can also be in a fourth switch state, in which the second switch and the third switch are turned on, so that the series inductance connected between the feeding point and the feed source is the first series inductance and the second series inductance, and the first grounded inductor is connected between the feed source and the ground, and is connected in parallel with the series first series inductance and the second series inductance and the feed end inductance, at which time the corresponding matching parameter value of the first matching unit or the second matching unit is the sum of the inductance values ​​of the first series inductance and the second series inductance, the feed end inductance and the parallel inductance value of the first grounded inductor.

15. The electronic device according to claim 14, characterized in that: The frequency band of electromagnetic wave signals supported for transmission and reception by the first radiation branch and the second radiation branch also includes a fourth frequency band. When the switch modules of the first matching unit and the second matching unit are in the fourth switching state, the frequency band supported by the first radiation branch and the second radiation branch is the fourth frequency band, wherein the fourth frequency band is higher than the second frequency band and lower than the first frequency band.

16. The electronic device according to claim 15, characterized in that: The first frequency band, the second frequency band, the third frequency band and the fourth frequency band are all low frequency bands, and are respectively N8, N20, N28 and N5 frequency bands.

17. The electronic device according to claim 9, characterized in that: The third matching unit and the fourth matching unit each include a plurality of matching element branches connected in parallel between the corresponding feeding point and the feed source, each matching element branch includes a matching element and a switch connected in series, and by enabling different matching element branches, the third matching unit and the fourth matching unit as a whole present different matching parameter values, so that the equivalent electrical length of the third radiation branch under the cooperation of the third matching unit is different, and the equivalent electrical length of the fourth radiation branch under the cooperation of the fourth matching unit is different.

18. The electronic device according to claim 17, characterized in that: The frequency bands of electromagnetic wave signals supported for transmission and reception by the third radiation branch and the fourth radiation branch include at least the first frequency band, the second frequency band and the third frequency band. The third matching unit and the fourth matching unit each include at least three matching element branches connected in parallel between the corresponding feeding point and the feed source. When different matching element branches are enabled, the frequency bands supported by the third radiation branch and the fourth radiation branch are the first frequency band, the second frequency band and the third frequency band, respectively.

19. The electronic device according to claim 18, characterized in that: The first frequency band, the second frequency band, the third frequency band and the fourth frequency band are all low frequency bands, and are respectively N8, N20 and N28 frequency bands.

20. The electronic device according to any one of claims 4 to 8, characterized in that: The first matching unit and the second matching unit both include at least one series inductor connected in series between the corresponding feeding point and the corresponding feed source, and a feed end inductor connected between the corresponding feed source and the ground. The equivalent electrical length of the first radiation branch under the cooperation of the first matching unit is equal to the equivalent electrical length of the second radiation branch under the cooperation of the second matching unit, and corresponds to the frequency band of the electromagnetic wave signals supported by the first radiation branch and the second radiation branch for transmission and reception.

21. The electronic device according to claim 20, characterized in that: The frequency band of the electromagnetic wave signal received and sent supported by the first radiation branch and the second radiation branch is a low frequency band, and is any one of the N8, N20, N28, and N5 frequency bands.

22. The electronic device according to claim 4, characterized in that: The third antenna unit also includes a fifth matching unit, and the fourth antenna unit also includes a sixth matching unit. The fifth matching unit is connected between the third feed source and the third feeding point for performing corresponding impedance matching adjustment, and the sixth matching unit is connected between the fourth feed source and the fourth feeding point for performing corresponding impedance matching adjustment. 23 . The electronic device according to claim 1 , comprising a middle frame, and the ground plate is at least a partial area in the middle frame. 24 . The electronic device according to claim 1 , comprising a frame, wherein the first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch are metal segments arranged on the frame.

25. The electronic device according to claim 1, characterized in that: The first radiation branch, the second radiation branch, the third radiation branch and the fourth radiation branch are arranged in the electronic device through an antenna bracket.

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