Near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication

Abstract

The invention discloses a near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication, and relates to the technical field of mobile communication and wireless communication. The near-field coupling external antenna comprises an external base assembly fixed to a rear cover of a mobile phone and an antenna support assembly connected with the external base assembly. The antenna bracket assembly can form resonance in a frequency required by a Sub-GHz frequency band; the external base assembly comprises an external assembly located on the rear cover of the mobile phone and an internal assembly located in the mobile phone; and the external component and the internal component form a non-contact metal coupling structure. A non-contact electromagnetic coupling mode is adopted for feeding, transmission of radio frequency signals is achieved, capacitive coupling can be formed between the metal flat plates, transmission line coupling can be formed between the planar C-shaped bands, and magnetic flux coupling can be formed by the spiral lines; the antenna bracket assembly can be designed into a mobile phone support frame form, so that the integrated design of the mobile phone support frame and the antenna structure is realized; the wireless communication capability of the mobile phone in the Sub-GHz frequency band can be enhanced; and the characteristic of high integration of the mobile phone is not damaged.

Description

Technical Field

[0001] The present invention relates to the field of mobile communications and wireless communications technology, and more specifically to the field of near-field coupling external antenna technology suitable for mobile phone Sub-GHz frequency band communications. Background Art

[0002] With the rapid development of Internet of Things technology, mobile phones and other handheld devices have become one of the indispensable items for people. With the rapid development of the Internet of Things (IoT), smart home, industrial automation and emergency communications, Sub-GHz bands (such as 433MHz, 868MHz, 915MHz, etc.) have become an important carrier for short-range wireless communications due to their strong penetration, long transmission distance and low power consumption. Especially in remote areas without cellular network coverage or emergency scenarios, communication devices based on Sub-GHz bands (such as LoRa, Zigbee, custom protocol modules) are widely used in environmental monitoring, remote control, disaster relief and other fields. 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, which makes it impossible for mobile phones to directly participate in such proprietary communication scenarios, limiting the functional expansion of users in a network-free environment.

[0003] The Sub-GHz frequency band of the built-in antenna of the mobile phone has the problems of large size, low efficiency, and the signal is easily affected by the surrounding metal devices. The metal frame of the handheld device is easily affected by the hand, etc., and it is difficult to tune in the low frequency band. At present, the support ring is mostly considered for support stability and aesthetics when applied to the device, ignoring its potential wireless communication capabilities.

[0004] Sub-GHz antennas, especially 433MHz antennas, are large in size and lack sufficient integration space on mobile phones. They also have problems such as narrow bandwidth, low gain, and difficult matching.

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

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

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: The present invention provides a near-field coupling external antenna suitable for Sub-GHz frequency band communication of a mobile phone, comprising an external base assembly fixed on the back cover of the mobile phone, and an antenna bracket assembly connected to the external base assembly for transmitting signals; the antenna bracket assembly can form resonance in the frequency required in the Sub-GHz frequency band; The external base assembly includes an external assembly located on the back cover of the mobile phone and an internal assembly located inside the mobile phone; the external assembly includes a metal parallel plate, a flat C-shaped belt or a spiral wire, and the internal assembly includes a metal flat plate, a flat C-shaped belt or a spiral wire arranged at a corresponding position 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 through the metal coupling structure.

[0008] Specifically, this scheme adopts non-contact electromagnetic coupling to realize the transmission of radio frequency signals. Capacitive coupling can be formed between metal plates, transmission line coupling can be formed between planar C-shaped strips, and magnetic flux coupling can be formed between spiral lines. The antenna bracket assembly can be designed in the form of a mobile phone support frame to realize the integrated design of the mobile phone support frame and antenna structure; it can enhance the wireless communication capability of the mobile phone in the Sub-GHz frequency band; and it does not destroy the highly integrated characteristics of the mobile phone.

[0009] In one embodiment, the external base assembly is fixed to the back cover of the mobile phone by magnetism, snap-on or adhesive means.

[0010] In one embodiment, the antenna bracket assembly includes a bracket shell, a bracket cover, a bracket hinge and a spring antenna. The bracket shell and the bracket cover are fixed by glue. The bracket shell and the bracket cover are buckled together to form an antenna cavity for accommodating the spring antenna. The bracket shell is provided with a mounting groove for installing the bracket hinge. The mounting groove is connected to the inside of the antenna cavity. One end of the spring antenna is connected to the bracket hinge, and the bracket hinge is connected to the external base assembly in a hinged manner.

[0011] In one embodiment, the external component includes a base ring, an external metal plate disposed inside the base ring, a bottom hinge is disposed at the edge of the external metal plate, a receiving groove for receiving the bottom hinge is disposed at the edge of the base ring, the bottom hinge and the bracket hinge are hingedly connected through a hinge shaft and a hinge lock, and a plurality of magnets are evenly distributed at the bottom of the base ring for magnetically fixing the mobile phone; The internal component includes a mobile phone PCB board, an internal metal plate connected to the mobile phone PCB board, and a first feeding position arranged on the internal metal plate, wherein the position of the internal metal plate corresponds to the position of the external metal plate; The spring antenna is connected to the external metal plate through the bracket hinge, and finally forms a capacitive coupling with the internal metal plate on the mobile phone.

[0012] In one embodiment, the antenna support assembly includes a rod-shaped antenna, an antenna slot arranged on the rod-shaped antenna along the length direction, a metal strip arranged in the antenna slot, and an antenna slot cover buckled on the antenna slot.

[0013] In one embodiment, the external component includes a structural body arranged on the back cover of the mobile phone, a plurality of buckles arranged on the edge of the structural body to clamp the structural body on the back cover of the mobile phone, a metal sheet arranged inside the structural body, an FPC soft board connected to the metal sheet, and a connecting sheet connecting the FPC soft board and the metal strip, and an external coupling coil is arranged on the FPC soft board; The internal components include a second mobile phone PCB board, an internal coupling coil connected to the second mobile phone PCB board, and a second feeding position arranged on the internal coupling coil, wherein the position of the internal coupling coil corresponds to the position of the external coupling coil; The external coupling coil is used to form a magnetic flux coupling with the internal coupling coil on the mobile phone.

[0014] 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 sheet, and the second connection contact is connected to the metal sheet.

[0015] Specifically, there are an external coupling coil and two contacts (a first connection contact and a second connection contact), the first connection contact is connected to the connection plate of the antenna, and the second connection contact is connected to the metal plate on the bottom plate. The external coupling coil is used to form a magnetic flux coupling with the internal coil on the mobile phone.

[0016] In one embodiment, the antenna bracket assembly includes a bracket shell, a bracket cover, two end hinges and two threaded antennas. The bracket shell and the bracket cover are fixed by glue. The bracket shell and the bracket cover are buckled together to form an antenna cavity for accommodating the two threaded antennas. The bracket shell is provided with two installation grooves for respectively installing the two end hinges. The two installation grooves are connected to the interior of the antenna cavity. Each threaded antenna is respectively connected to the corresponding end hinge, and the two end hinges are connected to the external base assembly in a hinged form.

[0017] In one embodiment, the external component includes a base ring, a bottom hinge disposed at the edge of the base ring, an external C-shaped belt disposed at the bottom of the bottom hinge, and the bottom hinge is hinged to the two end upper hinges through a hinge shaft and a hinge lock; The internal component includes a mobile phone PCB board, an internal C-shaped belt connected to the mobile phone PCB board, and a first feeding position arranged on the internal C-shaped belt, and the position of the internal C-shaped belt corresponds to the position of the external C-shaped belt; The two threaded antennas are respectively connected to two ends of the outer C-shaped belt through two corresponding upper end hinges, and the outer C-shaped belt and the inner C-shaped belt are close to form transmission line coupling.

[0018] In one embodiment, a plurality of magnets are evenly distributed on the bottom of the base ring for magnetically fixing the back cover of the mobile phone.

[0019] The beneficial effects of the present invention are as follows: The present invention adopts non-contact electromagnetic coupling to realize the transmission of radio frequency signals. The metal plate can form capacitive coupling, the plane C-shaped belt can form transmission line coupling, and the spiral line can form magnetic flux coupling. The antenna bracket assembly 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 capability of the mobile phone in the Sub-GHz frequency band; and it does not destroy the highly integrated characteristics of the mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a schematic diagram of the external contour structure of Example 2; Figure 2 is a structural schematic diagram of the antenna bracket assembly in Example 2; Figure 3 is a schematic structural diagram of the external base assembly in Example 2; Figure 4 is a schematic diagram of the structure of the internal components in Example 2; Figure 5 is a schematic diagram of the external contour structure of Example 3; Figure 6 is an assembly diagram of the antenna bracket assembly and the external base assembly in Example 3; Figure 7 is an exploded view of the antenna bracket assembly and the external base assembly in Example 3; Figure 8 yes Figure 7 A partial enlarged view of the middle A; Fig. 9 yes Figure 8 A partial enlarged view of point B in the middle Fig.10 is a schematic diagram of the structure of the internal components in Example 3; Fig.11 yes Fig.10 A partial enlarged view of point C in the middle; Fig.12 is a schematic diagram of the external contour structure of Example 4; Fig.13is a schematic structural diagram of the antenna bracket assembly in Example 4; Fig.14 is a schematic structural diagram of the external base assembly in Example 4; Fig.15 is a schematic diagram of the structure of the internal components in Example 4; Fig.16 is a schematic diagram of the structure when the external C-shaped belt and the internal C-shaped belt cooperate with each other in Example 4; Reference numerals: 1-antenna bracket assembly, 2-external base assembly, 3-end upper hinge, 4-threaded antenna, 5-external C-shaped strap, 6-internal C-shaped strap; 101- bracket shell, 102- bracket cover, 103- bracket hinge, 104- spring antenna; 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; 401-structural body, 402-clip, 403-rod antenna, 404-antenna slot cover, 405-metal sheet, 406-metal strip, 407-connecting sheet, 408-FPC soft board, 409-external coupling coil, 410-first connection contact, 411-second connection contact; 501 - second mobile phone PCB board, 502 - internal coupling coil, 503 - second feeding position. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and technical effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do 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 present invention.

[0026] Example 1 like Figures 1 to 13 As shown, this embodiment provides a near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication, including an external base component 2 fixed on the back cover of the mobile phone, and an antenna bracket component 1 connected to the external base component 2 for transmitting signals; the antenna bracket component 1 can form resonance in the frequency required in the Sub-GHz frequency band; The external base assembly 2 includes an external assembly located on the back cover of the mobile phone and an internal assembly located inside the mobile phone; the external assembly includes a metal parallel plate, a flat C-shaped belt or a spiral wire, and the internal assembly includes a metal flat plate, a flat C-shaped belt or a spiral wire arranged at a corresponding position 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 through the metal coupling structure.

[0027] Specifically, the 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 plates, transmission line coupling can be formed between planar C-shaped strips, and magnetic flux coupling can be formed between spiral lines. The antenna bracket assembly 1 can be designed in the form of a mobile phone support frame to realize an integrated design of the mobile phone support frame and the antenna structure; it can enhance the wireless communication capability of the mobile phone in the Sub-GHz frequency band; and it does not destroy the highly integrated characteristics of the mobile phone.

[0028] The external base assembly 2 is fixed to the back cover of the mobile phone by means of magnetism, buckle 402 or adhesive.

[0029] Example 2 like Figures 1 to 4 As shown, this embodiment provides a near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication, including an external base component 2 fixed on the back cover of the mobile phone, and an antenna bracket component 1 connected to the external base component 2 for transmitting signals; the antenna bracket component 1 can form resonance in the frequency required in the Sub-GHz frequency band; The external base assembly 2 includes 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.

[0030] The antenna bracket assembly 1 includes a bracket shell 101, a bracket cover 102, a bracket hinge 103 and a spring antenna 104. 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 spring antenna 104. The bracket shell 101 is provided with a mounting groove for installing the bracket hinge 103, and the mounting groove is connected to the inside of the antenna cavity. One end of the spring antenna 104 is connected to the bracket hinge 103, and the bracket hinge 103 is connected to the external base assembly 2 in a hinged form.

[0031] The external component includes a base ring 201, an external metal plate 202 arranged inside the base ring 201, a bottom hinge is arranged at the edge of the external metal plate 202, a receiving groove for receiving the bottom hinge is arranged at the edge of the base ring 201, the bottom hinge is hinged with the bracket hinge 103 through a hinge shaft 203 and a hinge lock 204, and a plurality of magnets 205 are evenly distributed at the bottom of the base ring 201 for magnetically fixing the mobile phone; The internal components include 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, and 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 through the bracket hinge 103, and finally forms a capacitive coupling with the internal metal plate 302 on the mobile phone.

[0032] For example, according to this solution, a capacitively coupled external magnetic bracket antenna suitable for mobile phone 433MHz frequency band communication can be designed. The example size of the capacitively coupled external magnetic bracket antenna is 61mm*54mm*7mm, and it consists of an antenna bracket component 1 and an external base component 2. The antenna bracket component 1 is designed to be an annular structure. There is a spiral line inside the annular structure of the antenna bracket component 1 to form a spring antenna 104, and the spring antenna 104 is connected to the bracket hinge 103. A magnet 205 is embedded in the external base component 2 for adsorption on the back cover of the mobile phone. There is a metal plate on the external base component 2, and there is a bottom hinge on 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 a capacitive coupling with the internal metal plate 302 on the mobile phone.

[0033] Example 3 like Figures 5 to 11 As shown, this embodiment provides a near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication, including an external base component 2 fixed on the back cover of the mobile phone, and an antenna bracket component 1 connected to the external base component 2 for transmitting signals; the antenna bracket component 1 can form resonance in the frequency required in the Sub-GHz frequency band; The external base assembly 2 includes 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.

[0034] The antenna support assembly 1 includes 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.

[0035] The external components include a structural body 401 disposed on the back cover of the mobile phone, a plurality of buckles 402 disposed on the edge of the structural body 401 to clamp the structural body 401 on the back cover of the mobile phone, a metal sheet 405 disposed inside the structural body 401, an FPC soft board 408 connected to the metal sheet 405, a connecting sheet 407 connecting the FPC soft board 408 and the metal strip 406, and an external coupling coil 409 is disposed on the FPC soft board 408; 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 arranged on the internal coupling coil 502, and 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.

[0036] The external coupling coil 409 is provided with a first connection contact 410 and a second connection contact 411 . The first connection contact 410 is connected to the connection sheet 407 , and the second connection contact 411 is connected to the metal sheet 405 .

[0037] Specifically, there are an external coupling coil 409 and two contacts (a first connection contact 410 and a second connection contact 411), the first connection contact 410 is connected to the antenna connection sheet 407, and the second connection contact 411 is connected to the metal sheet 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.

[0038] For example, according to this solution, a flux-coupled back-clip antenna suitable for mobile phone 470-510MHz frequency band communication can be designed. The example size of the flux-coupled back-clip antenna is 195mm*78mm*13.6mm. The structure of the structural body 401 is a square base plate, and a plurality of buckles 402 are provided on the edge of the square base plate. The buckles 402 are used to fix the structural body 401 to the back shell of the mobile phone. The rod-shaped antenna 403 has an antenna slot inside, and a long metal strip 406 is installed in the antenna slot as an antenna. The FPC soft board 408 is fixed inside the structural body 401 and is close to the back cover of the mobile phone. There is an external coupling coil 409 on the FPC soft board 408 for connecting the sheet 407 and the metal sheet 405. The external coupling coil 409 is used to form a magnetic flux coupling with the internal coil on the mobile phone.

[0039] Example 4 like Figure 12 to Figure 16 As shown, this embodiment provides a near-field coupling external antenna suitable for Sub-GHz frequency band communication of a mobile phone, including an external base component 2 fixed on the back cover of the mobile phone, and an antenna bracket component 1 connected to the external base component 2 for transmitting signals; the antenna bracket component 1 can form resonance in the frequency required in the Sub-GHz frequency band; 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 and the internal component form a non-contact metal coupling structure.

[0040] The antenna bracket assembly 1 includes 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 connected to the inside of the antenna cavity. Each threaded antenna 4 is respectively connected to the corresponding end hinge 3. The two end hinges 3 are connected to the external base assembly 2 in a hinged form.

[0041] In one embodiment, the external component includes a base ring 201, a bottom hinge arranged at the edge of the base ring 201, an external C-shaped belt 5 is arranged at the bottom of the bottom hinge, and the bottom hinge is hinged to the two end upper hinges 3 through a hinge shaft 203 and a hinge lock 204; The internal components include 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, and 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 connected to two ends of the external C-shaped belt 5 through two corresponding upper end hinges 3, and the external C-shaped belt 5 and the internal C-shaped belt 6 are close to form a transmission line coupling.

[0042] A plurality of magnets 205 are evenly distributed on the bottom of the base ring 201 for achieving magnetic attraction and fixation with the back cover of the mobile phone.

[0043] For example, according to the present solution, a transmission line coupled magnetic bracket antenna suitable for mobile phone 915MHz frequency band communication can be designed. The example size of the transmission line coupled magnetic bracket antenna is 67mm*52mm*6mm, and it consists of an external component and an antenna bracket component 1. A magnet 205 is embedded in the base ring 201 of the external component for adsorption on the back cover of the mobile phone. An external C-type belt 5 is provided at the bottom of the bottom hinge for forming a transmission line coupling with the internal C-type belt 6 in the mobile phone. Two spiral wires constitute the antenna, and the two spiral wires are respectively connected to the two ends of the external C-type belt 5 through two corresponding end hinges 3. When the external C-type belt 5 is close to the internal C-type belt 6, 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.

2. According to claim 1, a near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication is characterized in that: The external base assembly (2) is fixed to the back cover of the mobile phone by means of magnetism, snap-on (402) or gluing.

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 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.

4. The near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication according to claim 3, characterized in that: 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.

5. The near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication according to claim 2, characterized in that: 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.

6. A near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication according to claim 5, characterized in that: 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.

7. A near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication according to claim 6, 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).

8. The near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication according to claim 2, characterized in that: The antenna bracket assembly (1) comprises a bracket shell (101), a bracket cover (102), two end upper 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 upper 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 upper hinge (3); and the two end upper hinges (3) are connected to the external base assembly (2) in an articulated manner.

9. The near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication according to claim 8, characterized in that: 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.

10. The near-field coupling external antenna suitable for mobile phone Sub-GHz frequency band communication according to claim 9, 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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