A near-field coupling external antenna applicable to mobile phone Sub-GHz band communication

Abstract

The present invention discloses a near-field coupling external antenna applicable to mobile phone Sub-GHz band communication, which relates to the technical fields of mobile communication and wireless communication. It includes an external base component fixed on the back cover of the mobile phone and an antenna support component connected to the external base component; the antenna support component can form resonance at the frequencies required in the Sub-GHz band; the external base component includes an external component located on the back cover of the mobile phone and an internal component located inside the mobile phone; the external component and the internal component form a non-contact metal coupling structure. The present invention uses a non-contact electromagnetic coupling method for power feeding to achieve the transmission of radio frequency signals. Capacitive coupling can be formed between metal plates, transmission line coupling can be formed between planar C-shaped bands, and magnetic flux coupling can be formed by spiral lines; the antenna support component can be designed in the form of a mobile phone support frame to realize the integrated design of the mobile phone support frame and the antenna structure; it can enhance the wireless communication ability of the mobile phone in the Sub-GHz band; it does not damage the highly integrated characteristics of the mobile phone.

Description

Technical Field

[0001] The present invention relates to the technical fields of mobile communication and wireless communication, and more specifically to a near-field coupling external antenna technology applicable to mobile phone Sub-GHz band communication. Background Art

[0002] With the rapid development of Internet of Things technology, mobile devices such as mobile phones have become one of the indispensable items for people. With the rapid development of fields such as the Internet of Things (IoT), smart home, industrial automation, and emergency communication, the Sub-GHz band (such as 433 MHz, 868 MHz, 915 MHz, etc.) has become an important carrier for short-distance wireless communication due to its advantages of strong penetration, long transmission distance, and low power consumption. Especially in remote areas or emergency scenarios without cellular network coverage, communication devices based on the Sub-GHz band (such as LoRa, Zigbee, custom protocol modules) are widely used in fields such as environmental monitoring, remote control, and disaster relief. However, current smartphones generally support cellular networks (such as 4G / 5G) and high-frequency Wi-Fi / Bluetooth, and their built-in antenna systems are usually not adapted to the Sub-GHz band, resulting in the inability of mobile phones to directly participate in such proprietary communication scenarios, restricting the functional expansion of users in a network-free environment.

[0003] There are problems in the Sub-GHz band of mobile phone built-in antennas, such as large size, low efficiency, easy influence of signals by surrounding metal devices, and difficult tuning in the low-frequency band due to the influence of the metal frame of the handheld device by hand. Currently, the support rings mostly consider support stability and aesthetics when applied to devices, ignoring their potential wireless communication capabilities.

[0004] Sub-GHz antennas, especially 433 MHz antennas, are large in size, there is not enough space for integration on mobile phones, and there are problems such as narrow bandwidth, low gain, and difficult matching.

[0005] Existing external antennas rely on metal contacts or exposed interfaces, which will affect aesthetics and dust and water resistance performance, and the exposed metal may oxidize and cause the antenna to fail. Summary of the Invention

[0006] The purpose of the present invention is: to solve the above technical problems, the present invention provides a near-field coupling external antenna applicable to mobile phone Sub-GHz band communication.

[0007] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0008] The present invention provides a near-field coupling external antenna suitable for mobile phone Sub-GHz band communication, which includes an external base component fixed on the back cover of the mobile phone and an antenna support component connected to the external base component for transmitting signals; the antenna support component can form resonance at the frequencies required in the Sub-GHz band.

[0009] The external base component includes an external component located on the back cover of the mobile phone and an internal component located inside the mobile phone; the external component includes a metal parallel plate, a planar C-shaped band or a helix, and the internal component includes a metal flat plate, a planar C-shaped band or a helix arranged at the corresponding position inside the mobile phone. The external component and the internal component form a non-contact metal coupling structure, and the mobile phone radio frequency signal is transmitted to the antenna support component through the metal coupling structure.

[0010] Specifically, the power feeding of this solution adopts a non-contact electromagnetic coupling method to realize the transmission of radio frequency signals. Capacitive coupling can be formed between metal flat plates, transmission line coupling can be formed between planar C-shaped bands, and magnetic flux coupling can be formed by the helix. The antenna support component can be designed in the form of a mobile phone support frame to realize the integrated design of the mobile phone support frame and the antenna structure; it can enhance the wireless communication ability of the mobile phone in the Sub-GHz band; and it does not damage the highly integrated characteristics of the mobile phone.

[0011] In one embodiment, the external base component is fixed on the back cover of the mobile phone by magnetic attraction, buckling or gluing.

[0012] In one embodiment, the antenna support component includes a support shell, a support cover, a support hinge and a spring antenna. The support shell and the support cover are fixed by glue. After the support shell and the support cover are buckled, an antenna cavity for accommodating the spring antenna is formed. An installation groove for installing the support hinge is arranged on the support shell, and the installation groove is communicated with the inside of the antenna cavity. One end of the spring antenna is connected to the support hinge, and the support hinge is connected to the external base component in a hinged form.

[0013] In one embodiment, the external component includes a base ring and an external metal flat plate arranged inside the base ring. A bottom hinge is arranged at the edge of the external metal flat plate, and a receiving groove for accommodating the bottom hinge is arranged at the edge of the base ring. The bottom hinge and the support hinge are hinged through a hinge shaft and a hinge lock. A plurality of magnets for realizing magnetic attraction fixation with the mobile phone are evenly distributed at the bottom of the base ring;

[0014] The internal component includes a mobile phone PCB board, an internal metal flat plate connected to the mobile phone PCB board and a first power feeding position arranged on the internal metal flat plate. The position of the internal metal flat plate corresponds to the position of the external metal flat plate;

[0015] The spring antenna is connected to the external metal flat plate through the support hinge and finally forms capacitive coupling with the internal metal flat plate on the mobile phone.

[0016] In one embodiment, the antenna support assembly includes a rod-shaped antenna, an antenna groove provided along the length direction on the rod-shaped antenna, a metal strip provided in the antenna groove, and an antenna groove cover buckled on the antenna groove.

[0017] In one embodiment, the external component includes a structural body provided on the back cover of the mobile phone, a plurality of buckles provided at the edge of the structural body to clamp the structural body on the back cover of the mobile phone, a metal sheet provided inside the structural body, an FPC flexible board connected to the metal sheet, and a connecting piece connecting the FPC flexible board and the metal strip. There is an external coupling coil on the FPC flexible board;

[0018] The internal component includes a second mobile phone PCB board, an internal coupling coil connected to the second mobile phone PCB board, and a second feeding position provided on the internal coupling coil. The position of the internal coupling coil corresponds to the position of the external coupling coil;

[0019] The external coupling coil is used to form magnetic flux coupling with the internal coupling coil on the mobile phone.

[0020] In one embodiment, a first connection contact and a second connection contact are provided on the external coupling coil. The first connection contact is connected to the connecting piece, and the second connection contact is connected to the metal sheet.

[0021] Specifically, there is an external coupling coil and two contacts (the first connection contact and the second connection contact) on it. The first connection contact is connected to the connecting piece of the antenna, and the second connection contact is connected to the metal sheet on the bottom plate. The external coupling coil is used to form magnetic flux coupling with the internal coil on the mobile phone.

[0022] In one embodiment, the antenna support assembly includes a support shell, a support cover, two end upper hinges, and two threaded antennas. The support shell and the support cover are fixed by glue. After the support shell and the support cover are buckled, an antenna cavity for accommodating the two threaded antennas is formed. Two installation slots for respectively installing the two end upper hinges are provided on the support shell. Both installation slots communicate with the inside of the antenna cavity. Each threaded antenna is respectively connected to the corresponding end upper hinge. The two end upper hinges are connected to the external base assembly in a hinged manner.

[0023] In one embodiment, the external component includes a base ring and a bottom hinge provided at the edge of the base ring. An external C-shaped band is provided at the bottom of the bottom hinge. The bottom hinge and the two end upper hinges are hinged through a hinge shaft and a hinge lock;

[0024] The internal component includes a mobile phone PCB board, an internal C-shaped band connected to the mobile phone PCB board, and a first feeding position provided on the internal C-shaped band. The position of the internal C-shaped band corresponds to the position of the external C-shaped band;

[0025] Two spiral antennas are respectively connected to two ends of an external C-shaped band through two corresponding end hinges, and the external C-shaped band and the internal C-shaped band are close to each other to form a transmission line coupling.

[0026] In one embodiment, a plurality of magnets for realizing magnetic attraction fixation with the mobile phone back cover are evenly distributed at the bottom of the base ring.

[0027] The beneficial effects of the present invention are as follows:

[0028] The present invention uses a non-contact electromagnetic coupling method for feeding to realize the transmission of radio frequency signals. The metal plate can form a capacitive coupling, the planar C-shaped band can form a transmission line coupling, and the spiral can form a magnetic flux coupling. The antenna support assembly can be designed in the form of a mobile phone support to realize the integrated design of the mobile phone support and the antenna structure; it can enhance the wireless communication ability of the mobile phone in the Sub-GHz frequency band; and it does not damage the highly integrated characteristics of the mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0030] Figure 1 is a schematic diagram of the external contour structure of Embodiment 2;

[0031] Figure 2 is a schematic diagram of the structure of the antenna support assembly in Embodiment 2;

[0032] Figure 3 is a schematic diagram of the structure of the external base assembly in Embodiment 2;

[0033] Figure 4 is a schematic diagram of the structure of the internal assembly in Embodiment 2;

[0034] Figure 5 is a schematic diagram of the external contour structure of Embodiment 3;

[0035] Figure 6 is an assembly drawing of the antenna support assembly and the external base assembly in Embodiment 3;

[0036] Figure 7 is an exploded view of the antenna support assembly and the external base assembly in Embodiment 3;

[0037] Figure 8 is Figure 7 a partial enlarged view of A in;

[0038] Figure 9Yes Figure 8 Partial enlarged view at position B in

[0039] Figure 10 It is a schematic structural diagram of the internal components in Embodiment 3;

[0040] Figure 11 Yes Figure 10 Partial enlarged view at position C in

[0041] Figure 12 It is a schematic structural diagram of the external contour of Embodiment 4;

[0042] Figure 13 It is a schematic structural diagram of the antenna support assembly in Embodiment 4;

[0043] Figure 14 It is a schematic structural diagram of the external base assembly in Embodiment 4;

[0044] Figure 15 It is a schematic structural diagram of the internal components in Embodiment 4;

[0045] Figure 16 It is a schematic structural diagram when the external C-shaped band and the internal C-shaped band cooperate in Embodiment 4;

[0046] Reference numerals: 1 - antenna support assembly, 2 - external base assembly, 3 - end upper hinge, 4 - threaded antenna, 5 - external C-shaped band, 6 - internal C-shaped band;

[0047] 101 - support shell, 102 - support cover, 103 - support hinge, 104 - spring antenna;

[0048] 201 - base ring, 202 - external metal plate, 203 - hinge shaft, 204 - hinge lock, 205 - magnet, 301 - mobile phone PCB board, 302 - internal metal plate, 303 - first feeding position;

[0049] 401 - structural main body, 402 - buckle, 403 - rod-shaped antenna, 404 - antenna slot cover, 405 - metal sheet, 406 - metal strip, 407 - connecting piece, 408 - FPC flexible board, 409 - external coupling coil, 410 - first connection contact, 411 - second connection contact;

[0050] 501 - second mobile phone PCB board, 502 - internal coupling coil, 503 - second feeding position. Detailed implementation manners

[0051] To make the technical problems, technical solutions and technical effects of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention usually described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0053] It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0054] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inside", "outside", "above", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention.

[0055] Embodiment 1

[0056] As Figures 1 to 13 shown, this embodiment provides a near-field coupling external antenna applicable to mobile phone Sub-GHz band communication, including an external base component 2 fixed on the back cover of the mobile phone and an antenna support component 1 connected to the external base component 2 for transmitting signals; the antenna support component 1 can form resonance at the frequencies required in the Sub-GHz band;

[0057] The external base component 2 includes an external component located on the back cover of the mobile phone and an internal component located inside the mobile phone; the external component includes a metal parallel plate, a planar C-shaped band or a helix, and the internal component includes a metal plate, a planar C-shaped band or a helix arranged at the corresponding position inside the mobile phone. The external component and the internal component form a non-contact metal coupling structure, and the mobile phone radio frequency signal is transmitted to the antenna support component 1 through the metal coupling structure.

[0058] Specifically, the power supply of this solution adopts a non-contact electromagnetic coupling method to achieve the transmission of radio frequency signals. Capacitive coupling can be formed between metal plates, transmission line coupling can be formed between planar C-shaped bands, and magnetic flux coupling can be formed by spiral lines. The antenna support assembly 1 can be designed in the form of a mobile phone support frame to achieve an integrated design of the mobile phone support frame and the antenna structure; it can enhance the wireless communication ability of the mobile phone in the Sub-GHz frequency band; and it does not damage the highly integrated characteristics of the mobile phone.

[0059] The external base assembly 2 is fixed to the back cover of the mobile phone by magnetic attraction, snap 402 or adhesive.

[0060] Embodiment 2

[0061] As Figures 1 to 4 shown, this embodiment provides a near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication, including an external base assembly 2 fixed to the back cover of the mobile phone and an antenna support assembly 1 connected to the external base assembly 2 for transmitting signals; the antenna support assembly 1 can form resonance at the frequencies required in the Sub-GHz frequency band;

[0062] The external base assembly 2 includes an external component located on the back cover of the mobile phone and an internal component located inside the mobile phone; the external component and the internal component form a non-contact metal coupling structure.

[0063] The antenna support assembly 1 includes a support shell 101, a support cover 102, a support hinge 103, and a spring antenna 104. The support shell 101 and the support cover 102 are fixed by glue. After the support shell 101 and the support cover 102 are buckled, an antenna cavity for accommodating the spring antenna 104 is formed. An installation groove for installing the support hinge 103 is provided on the support shell 101, and the installation groove communicates with the inside of the antenna cavity. One end of the spring antenna 104 is connected to the support hinge 103, and the support hinge 103 is connected to the external base assembly 2 in a hinged form.

[0064] The external component includes a base ring 201 and an external metal plate 202 disposed inside the base ring 201. A bottom hinge is provided at the edge of the external metal plate 202, and a receiving groove for accommodating the bottom hinge is provided at the edge of the base ring 201. The bottom hinge and the support hinge 103 are hinged through a hinge shaft 203 and a hinge lock 204. A plurality of magnets 205 for magnetically fixing to the mobile phone are evenly distributed at the bottom of the base ring 201;

[0065] The internal component includes a mobile phone PCB board 301, an internal metal plate 302 connected to the mobile phone PCB board 301, and a first power feeding position 303 provided on the internal metal plate 302. The position of the internal metal plate 302 corresponds to the position of the external metal plate 202;

[0066] The spring antenna 104 is connected to the external metal plate 202 through the bracket hinge 103, and finally forms capacitive coupling with the internal metal plate 302 on the mobile phone.

[0067] For example, according to this solution, a capacitive coupling external magnetic adsorption bracket antenna applicable to the 433 MHz frequency band communication of mobile phones can be designed. The example size of this capacitive coupling external magnetic adsorption bracket antenna is 61 mm * 54 mm * 7 mm, and it is composed of an antenna bracket assembly 1 and an external base assembly 2. The antenna bracket assembly 1 is designed as an annular structure, and there is a spiral line inside the annular structure of the antenna bracket assembly 1 to form the spring antenna 104, and the spring antenna 104 is connected to the bracket hinge 103. The external base assembly 2 is embedded with a magnet 205 for adsorbing on the back cover of the mobile phone. There is a metal plate on the external base assembly 2, and there is a bottom hinge at the edge of the metal plate. The spring antenna 104 is connected to the external metal plate 202 through the bracket hinge 103, and finally forms capacitive coupling with the internal metal plate 302 on the mobile phone.

[0068] Embodiment 3

[0069] As Figures 5 to 11 shown, this embodiment provides a near-field coupling external antenna applicable to the Sub-GHz frequency band communication of mobile phones, including an external base assembly 2 fixed on the back cover of the mobile phone and an antenna bracket assembly 1 connected to the external base assembly 2 for transmitting signals; the antenna bracket assembly 1 can form resonance at the frequencies required by the Sub-GHz frequency band;

[0070] The external base assembly 2 includes an external component located on the back cover of the mobile phone and an internal component located inside the mobile phone; the external component and the internal component form a non-contact metal coupling structure.

[0071] The antenna bracket assembly 1 includes a rod-shaped antenna 403, an antenna slot arranged along the length direction on the rod-shaped antenna 403, a metal strip 406 arranged in the antenna slot, and an antenna slot cover 404 buckled on the antenna slot.

[0072] The external component includes a structure main body 401 arranged on the back cover of the mobile phone, a plurality of buckles 402 arranged on the edge of the structure main body 401 to clamp the structure main body 401 on the back cover of the mobile phone, a metal sheet 405 arranged inside the structure main body 401, an FPC flexible board 408 connected to the metal sheet 405, a connecting piece 407 connecting the FPC flexible board 408 and the metal strip 406, and an external coupling coil 409 on the FPC flexible board 408;

[0073] The internal components include a second mobile phone PCB board 501, an internal coupling coil 502 connected to the second mobile phone PCB board 501, and a second feeding position 503 provided on the internal coupling coil 502. The position of the internal coupling coil 502 corresponds to the position of the external coupling coil 409. The external coupling coil 409 is used to form a magnetic flux coupling with the internal coupling coil 502 on the mobile phone.

[0074] A first connection contact 410 and a second connection contact 411 are provided on the external coupling coil 409. The first connection contact 410 is connected to the connection piece 407, and the second connection contact 411 is connected to the metal piece 405.

[0075] Specifically, there is an external coupling coil 409 and two contacts (the first connection contact 410 and the second connection contact 411) on it. The first connection contact 410 is connected to the connection piece 407 of the antenna, and the second connection contact 411 is connected to the metal piece 405 on the bottom plate. The external coupling coil 409 is used to form a magnetic flux coupling with the internal coil on the mobile phone.

[0076] For example, according to this solution, a magnetic flux coupling back clip antenna applicable to mobile phone communication in the 470 - 510 MHz frequency band can be designed. The size of this magnetic flux coupling back clip antenna example is 195mm * 78mm * 13.6mm. The structure of the main body 401 is a square bottom plate, and a plurality of buckles 402 are provided on the edge of the square bottom plate. The buckles 402 are used to fix the main body 401 to the mobile phone back cover. There is an antenna slot inside the rod-shaped antenna 403, and a long metal strip 406 is installed in the antenna slot as the antenna. The FPC flexible board 408 is fixed inside the main body 401 and is close to the mobile phone back cover. There is an external coupling coil 409 on the FPC flexible board 408 for the connection piece 407 and the metal piece 405, and the external coupling coil 409 is used to form a magnetic flux coupling with the internal coil on the mobile phone.

[0077] Embodiment 4

[0078] As Figures 12 to 16 As shown, this embodiment provides a near-field coupling external antenna applicable to mobile phone Sub-GHz frequency band communication, including an external base component 2 fixed on the mobile phone back cover and an antenna support component 1 connected to the external base component 2 for transmitting signals. The antenna support component 1 can form resonance at the frequencies required in the Sub-GHz frequency band. The external base component 2 includes an external component located on the mobile phone back cover and an internal component located inside the mobile phone. The external component and the internal component form a non-contact metal coupling structure.

[0079] The antenna support assembly 1 includes a support housing 101, a support cover 102, two end upper hinges 3, and two threaded antennas 4. The support housing 101 and the support cover 102 are fixed by glue. After the support housing 101 and the support cover 102 are buckled, an antenna cavity for accommodating the two threaded antennas 4 is formed. Two mounting grooves for respectively mounting the two end upper hinges 3 are provided on the support housing 101, and both mounting grooves communicate with the inside of the antenna cavity. Each threaded antenna 4 is respectively connected to the corresponding end upper hinge 3, and the two end upper hinges 3 are connected to the external base assembly 2 in a hinged manner.

[0080] In one embodiment, the external component includes a base ring 201, a bottom hinge provided at the edge of the base ring 201, an external C-shaped band 5 provided at the bottom of the bottom hinge. The bottom hinge and the two end upper hinges 3 are hinged by a hinge shaft 203 and a hinge lock 204;

[0081] The internal component includes a mobile phone PCB board 301, an internal C-shaped band 6 connected to the mobile phone PCB board 301, and a first feeding position 303 provided on the internal C-shaped band 6. The position of the internal C-shaped band 6 corresponds to the position of the external C-shaped band 5;

[0082] The two threaded antennas 4 are respectively connected to both ends of the external C-shaped band 5 through the two corresponding end upper hinges 3, and the external C-shaped band 5 and the internal C-shaped band 6 are close to each other to form a transmission line coupling.

[0083] A plurality of magnets 205 for magnetically fixing to the mobile phone back cover are evenly distributed at the bottom of the base ring 201.

[0084] For example, according to this solution, a transmission line coupling magnetic adsorption bracket antenna applicable to the 915 MHz frequency band communication of a mobile phone can be designed. The example size of the transmission line coupling magnetic adsorption bracket antenna is 67 mm * 52 mm * 6 mm, and it is composed of an external component and an antenna support assembly 1. A magnet 205 is embedded in the base ring 201 of the external component for adsorbing on the mobile phone back cover. An external C-shaped band 5 is provided at the bottom of the bottom hinge for forming a transmission line coupling with the internal C-shaped band 6 inside the mobile phone. Two spiral lines form the antenna, and the two spiral lines are respectively connected to both ends of the external C-shaped band 5 through the two corresponding end upper hinges 3. When the external C-shaped band 5 and the internal C-shaped band 6 are close to each other, a good transmission line coupling is formed.

Claims

1. A near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication, characterized in that: It comprises an external base assembly (2) fixed on the back cover of a mobile phone, and an antenna support assembly (1) connected to the external base assembly (2) and used for transmitting signals; the antenna support assembly (1) is capable of forming resonance at a frequency required in the Sub-GHz frequency band; The external base assembly (2) comprises an external assembly located on the back cover of the mobile phone and an internal assembly located inside the mobile phone; the external assembly and the internal assembly form a non-contact metal coupling structure, and the mobile phone radio frequency signal is transmitted to the antenna bracket assembly (1) via the metal coupling structure; The external base assembly (2) is fixed to the back cover of the mobile phone by means of magnetism, snap-on (402) or adhesive; The antenna support assembly (1) comprises a support shell (101), a support cover (102), a support hinge (103) and a spring antenna (104); the support shell (101) and the support cover (102) are fixed by glue; the support shell (101) and the support cover (102) are buckled together to form an antenna cavity for accommodating the spring antenna (104); a mounting groove for mounting the support hinge (103) is provided on the support shell (101); the mounting groove is communicated with the inside of the antenna cavity; one end of the spring antenna (104) is connected to the support hinge (103); and the support hinge (103) is connected to the external base assembly (2) in an articulated manner; The external component comprises a base ring (201), an external metal plate (202) arranged inside the base ring (201), a bottom hinge being arranged at the edge of the external metal plate (202), a receiving groove for receiving the bottom hinge being arranged at the edge of the base ring (201), the bottom hinge being hinged to the bracket hinge (103) via a hinge shaft (203) and a hinge lock (204), and a plurality of magnets (205) for magnetically fixing the mobile phone are evenly distributed at the bottom of the base ring (201); The internal component comprises a mobile phone PCB board (301), an internal metal plate (302) connected to the mobile phone PCB board (301), and a first feeding position (303) arranged on the internal metal plate (302), wherein the position of the internal metal plate (302) corresponds to the position of the external metal plate (202); The spring antenna (104) is connected to the external metal plate (202) via the bracket hinge (103), and finally forms capacitive coupling with the internal metal plate (302) on the mobile phone.

2. A near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication, characterized in that: It comprises an external base assembly (2) fixed on the back cover of a mobile phone, and an antenna support assembly (1) connected to the external base assembly (2) and used for transmitting signals; the antenna support assembly (1) is capable of forming resonance at a frequency required in the Sub-GHz frequency band; The external base assembly (2) comprises an external assembly located on the back cover of the mobile phone and an internal assembly located inside the mobile phone; the external assembly and the internal assembly form a non-contact metal coupling structure, and the mobile phone radio frequency signal is transmitted to the antenna bracket assembly (1) via the metal coupling structure; The external base assembly (2) is fixed to the back cover of the mobile phone by means of magnetism, snap-on (402) or adhesive; The antenna support assembly (1) comprises a rod-shaped antenna (403), an antenna slot arranged on the rod-shaped antenna (403) along the length direction, a metal strip (406) arranged in the antenna slot, and an antenna slot cover (404) buckled on the antenna slot; The external component comprises a structural body (401) arranged on the back cover of the mobile phone, a plurality of buckles (402) arranged at the edge of the structural body (401) for clamping the structural body (401) on the back cover of the mobile phone, a metal sheet (405) arranged inside the structural body (401), an FPC soft board (408) connected to the metal sheet (405), and a connecting sheet (407) connecting the FPC soft board (408) and the metal strip (406), wherein the FPC soft board (408) has an external coupling coil (409) on it; the internal component comprises a second mobile phone PCB board (501), an internal coupling coil (502) connected to the second mobile phone PCB board (501), and a second feeding position (503) arranged on the internal coupling coil (502), wherein the position of the internal coupling coil (502) corresponds to the position of the external coupling coil (409); The external coupling coil (409) is used to form a magnetic flux coupling with the internal coupling coil (502) on the mobile phone.

3. According to claim 2, a near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication is characterized in that: The external coupling coil (409) is provided with a first connection contact (410) and a second connection contact (411), the first connection contact (410) being connected to the connection sheet (407), and the second connection contact (411) being connected to the metal sheet (405).

4. A near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication, characterized in that: It comprises an external base assembly (2) fixed on the back cover of a mobile phone, and an antenna support assembly (1) connected to the external base assembly (2) and used for transmitting signals; the antenna support assembly (1) is capable of forming resonance at a frequency required in the Sub-GHz frequency band; The external base assembly (2) comprises an external assembly located on the back cover of the mobile phone and an internal assembly located inside the mobile phone; the external assembly and the internal assembly form a non-contact metal coupling structure, and the mobile phone radio frequency signal is transmitted to the antenna bracket assembly (1) via the metal coupling structure; The external base assembly (2) is fixed to the back cover of the mobile phone by means of magnetism, snap-on (402) or adhesive; The antenna bracket assembly (1) comprises a bracket shell (101), a bracket cover (102), two end hinges (3) and two threaded antennas (4); the bracket shell (101) and the bracket cover (102) are fixed by glue; the bracket shell (101) and the bracket cover (102) are buckled together to form an antenna cavity for accommodating the two threaded antennas (4); the bracket shell (101) is provided with two mounting grooves for respectively mounting the two end hinges (3); the two mounting grooves are both communicated with the inside of the antenna cavity; each threaded antenna (4) is respectively connected to the corresponding end hinge (3); and the two end hinges (3) are connected to the external base assembly (2) in an articulated manner; The external component comprises a base ring (201), a bottom hinge arranged at the edge of the base ring (201), the bottom hinge being hinged to the two end upper hinges (3) via a hinge shaft (203) and a hinge lock (204), and an external C-shaped belt (5) being arranged at the bottom of the bottom hinge; The internal component comprises a mobile phone PCB board (301), an internal C-shaped belt (6) connected to the mobile phone PCB board (301), and a first feeding position (303) arranged on the internal C-shaped belt (6), wherein the position of the internal C-shaped belt (6) corresponds to the position of the external C-shaped belt (5); The two threaded antennas (4) are respectively connected to two ends of the external C-shaped belt (5) through two corresponding end hinges (3), and the external C-shaped belt (5) and the internal C-shaped belt (6) are close to form transmission line coupling.

5. The near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication according to claim 4, characterized in that: The bottom of the base ring (201) is evenly distributed with a plurality of magnets (205) for achieving magnetic attraction and fixation with the back cover of the mobile phone.

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