Coupling assembly, preparation method and coupler comprising coupling assembly

Abstract

The invention relates to the technical field of couplers, and provides a coupling assembly, a preparation method and a coupler comprising the coupling assembly, the coupler comprises a first grounding plate, the coupling assembly and a second grounding plate which are sequentially stacked, a connector communicated with an inner conductor of the coupler is arranged on the outer wall of the coupling assembly, and the coupling assembly comprises a shell. A through groove body is arranged in the shell, a coupler inner conductor is arranged in the groove body, the coupler inner conductor comprises a straight-through inner conductor and a coupling inner conductor, and a plurality of through holes are formed in the side wall of the shell along the path where the straight-through inner conductor and the coupling inner conductor are located. In the preparation process of the coupling assembly, the positions of the coupling inner conductor, the straight-through inner conductor and the shell are always kept integrated, the assembly precision is improved, and the assembly difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of couplers, and in particular to a coupling component, a preparation method and a coupler comprising the coupling component. Background Art

[0002] Directional coupler is an important signal separation microwave module in measuring instruments such as vector network analyzers, and is a key front-end microwave device in RF instruments such as vector network analyzers and signal sources.

[0003] As early as the 1960s and 1970s, rectangular metal rod directional couplers based on metal material processing have emerged and have been widely used in electronic equipment. With the development of electronic technology, various directional couplers based on various substrate materials such as SiGe, GaAs, Al2O3, and using special processing techniques such as etching and MEMS processing have emerged in an endless stream, and microwave modules such as directional couplers have also developed rapidly. However, in these technologies, due to the existence of various substrate materials, either the phase velocities of the odd mode and the coupled mode are different due to the uneven dielectric material around the coupling inner conductor, causing the directivity of the directional coupler to deteriorate; or the dielectric loss caused by the dielectric material leads to large straight-through insertion loss of the coupler. Therefore, the air-filled stripline directional coupler without substrate material still has a great advantage in coupler performance.

[0004] In existing directional couplers, the coupling inner conductor adopts a rectangular cross-section transmission line, which has a slender shape and high shape and position accuracy requirements. The cross-sectional shape of the transmission line will decrease with the increase of frequency. At the same time, in order to ensure the relative position between the two coupling inner conductors and between the coupling inner conductor and the shell, it is also necessary to design positioning holes and support structures on the coupling inner conductor. The existence of the positioning holes reduces the strength of the coupling inner conductor. In the paper "A Forming Process for Slender Rectangular Cross-Section Transmission Line", Lu Bo and Huo Jiandong, "Electronic Mechanical Engineering", 2013, 29(02): 55-58, the processing method of the coupling inner conductor parts is introduced in detail. This method is feasible for processing directional couplers with a frequency lower than 67GHz. However, when processing directional couplers and other related parts with a frequency higher than 67GHz, it has become more difficult and the yield rate is low. The existing structural scheme and preparation method are not only difficult to process, but the coupling inner conductor is also more likely to deform during transportation and assembly, and the relative position and size between parts are not easy to guarantee. Therefore, in the entire production process, the production cycle of the directional coupler is long, the yield is low, and the processing cost is high. For directional couplers with a maximum frequency exceeding 145GHz, there is a bottleneck problem in processing and assembly. Summary of the invention

[0005] In order to solve the problems in the prior art that the coupling inner conductor is difficult to process, easy to deform, and the relative position and size between parts are difficult to ensure, the first purpose of the present invention is to provide a coupling component, including a shell, a through slot body is provided in the shell, a coupler inner conductor is provided in the slot body, the coupler inner conductor includes a straight-through inner conductor and a coupling inner conductor, a plurality of through holes are provided on the side wall of the shell along the path where the straight-through inner conductor and the coupling inner conductor are located, and a first insulating support for fixing the straight-through inner conductor and the coupling inner conductor is provided in the through hole.

[0006] Specifically, one end of the first insulating support is connected to the through hole, and the other end of the first insulating support is coated with insulating glue and bonded to the inner conductor of the coupler. A compensation groove is provided in the coupled inner conductor at the bonding point between the inner conductor of the coupler and the first insulating support.

[0007] Specifically, a second insulating support is arranged opposite to the first insulating support at the end of the inner conductor of the coupler, and the inner conductor of the coupler is clamped between the first insulating support and the second insulating support.

[0008] Specifically, a mounting portion is provided in the coupling assembly, a pressing block for fixing the second insulating support is provided in the mounting portion, a clamping groove is provided in the pressing block and the shell respectively, the pressing block is installed in the mounting portion by bolts, one end of the second insulating support is clamped between the pressing block and the shell, the end of the other end of the second insulating support is coated with insulating glue and bonded to the inner conductor of the coupler, and a compensation groove is provided in the coupled inner conductor at the bonding point between the inner conductor of the coupler and the second insulating support.

[0009] The second object of the present invention is to provide a method for manufacturing the above-mentioned coupling assembly, comprising:

[0010] S1: Obtain a workpiece, and perform milling processing on the workpiece to obtain an integrated part that connects the coupling inner conductor and the through inner conductor to the housing through process support;

[0011] S2: embedding the coupled inner conductor and the straight inner conductor of the integrated part into a fixing fixture, and using a pressing device to press and fix the relative positions of the coupled inner conductor, the straight inner conductor and the housing in the integrated part;

[0012] S3: removing the process support by cutting, and forming a fixing hole on the side wall of the integrated part at the location of the process support close to the outer wall of the shell;

[0013] S4: installing a first insulating support coated with insulating glue in the fixing hole so that the first insulating support fixes the relative position of the inner conductor of the coupler and the housing;

[0014] S5: After the fixing state of the first insulating support is stabilized, the fixing fixture and the pressing device are removed.

[0015] Specifically, in step S3, a mounting portion having a clamping groove is milled in the integrated part at a location of a process support away from an outer wall of the housing.

[0016] Specifically, in step S4, a second insulating support having an end coated with insulating glue is installed in the clamping groove in the installation portion, and a pressing block is used to clamp and fix the second insulating support.

[0017] The third object of the present invention is to provide a coupler, comprising a first ground plate, a coupling assembly and a second ground plate stacked in sequence, wherein a connector connected to an inner conductor of the coupler is arranged on an outer wall of the coupling assembly.

[0018] Specifically, the through inner conductor and the coupled inner conductor are provided with coupling sections close to each other, and an isolation structure is provided between the through inner conductor and the coupled inner conductor in the coupling section in the first ground plate and / or the second ground plate.

[0019] Specifically, the connector includes a connector outer conductor and a connector inner conductor, the connector inner conductor is connected to the coupler inner conductor, and the coupler inner conductor and the connector inner conductor are elastically interconnected by an elastic contact piece; or matching protrusions and U-shaped grooves are respectively provided on the end faces of the connector inner conductor and the coupler inner conductor, the protrusions are inserted into the U-shaped grooves, and are bonded by soldering or conductive adhesive.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention fixes the inner conductor of the coupler by means of a first insulating support and a second insulating support coated with insulating glue. The ultra-wideband directional coupler using the fixed structure can prepare an ultra-wideband coaxial directional coupler with a maximum frequency of up to 220 GHz and a bandwidth ratio of up to 100 times. The inner conductor of the coupler is fixed by means of insulating supports through insulating glue. There is no need to process tiny positioning holes in the inner conductor of the coupler to fix the position of the inner conductor of the coupler as in the prior art. While ensuring the stability of the fixed position of the inner conductor of the coupler, the processing difficulty of the inner conductor of the coupler is reduced, and the strength and deformation resistance of the inner conductor of the coupler are improved.

[0022] 2. The present invention integrates the processing and assembly of the straight-through inner conductor, the coupled inner conductor and the shell. The positional dimensions of the straight-through inner conductor, the coupled inner conductor and the shell can be ensured by a form-fixing fixture, thereby realizing the accurate transfer of the dimension chain. While reducing the processing difficulty, the shape positioning accuracy is improved, the risk of deformation of the coupled inner conductor is reduced, the assembly difficulty is reduced, and the risk of damage to parts during transportation and assembly is reduced. In addition, the present invention adopts traditional mechanical processing methods, and can realize the processing, assembly and packaging of tiny parts without increasing the high equipment cost of the new process line.

[0023] 3. In the structural scheme adopted by the present invention, the connector inner conductor, the coupling inner conductor and the through inner conductor can be connected by welding, bonding and other connection methods in addition to elastic connection, which provides more options for directional coupling packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a stereoscopic diagram of the overall structure of the directional coupler of the present invention;

[0025] Figure 2 It is a cross-sectional view of the internal structure of the coupler of the present invention;

[0026] Figure 3 It is a three-dimensional diagram of the coupling assembly structure of the present invention;

[0027] Figure 4 This is an enlarged view of part A of the present invention;

[0028] Figure 5 is a schematic diagram of a first grounding plate of the present invention;

[0029] Figure 6 This is a schematic diagram of the connector structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the elastic interconnection structure of the connector of the present invention;

[0031] Figure 8 This is a schematic diagram of the plug-in interconnection structure of the connector of the present invention;

[0032] Fig. 9 This is a schematic diagram of an integrated part obtained in step S1 of the present invention;

[0033] Fig.10 This is a schematic diagram of the fixing fixture structure of the present invention;

[0034] Fig.11 This is a front view of the integrated parts assembly state in step S2 of the present invention;

[0035] Fig.12 This is a top view of the integrated parts assembly state in step S2 of the present invention;

[0036] Fig.13 This is a schematic diagram of the structure of the integrated part after cutting in step S3 of the present invention;

[0037] Fig.14 This is a schematic diagram of the structure after the integrated parts are assembled in step S4 of the present invention.

[0038] 1. Coupling assembly; 11. Shell; 111. Fixing hole; 112. Mounting hole; 113. First threaded hole; 12. Slot body; 13. Straight-through inner conductor; 131. Compensation slot; 132. End face; 133. U-shaped slot; 14. Coupling inner conductor; 15. First insulating support; 16. Second insulating support; 17. Press block; 18. Mounting portion; 181. Snap-in slot; 19. Process support; 2. First grounding plate; 21. Isolation structure; 22. Second threaded hole; 3. Second grounding plate; 4. Connector; 41. Connector outer conductor; 42. Connector inner conductor; 421. Bump; 422. Elastic contact piece; 5. Fixing fixture; 51. Base; 511. Third threaded hole; 52. Positioning block; 521. Coupling inner conductor positioning cavity; 522. Straight-through inner conductor positioning cavity; 523. Make way slot; 6. Press-fit device. DETAILED DESCRIPTION

[0039] 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. The specific implementation of the present invention is described in detail below in combination with specific embodiments.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0041] The present invention provides a coupling component 1, which is installed in an ultra-wideband directional coupler. Figure 1 As shown, the ultra-wideband directional coupler includes a first ground plate 2, a coupling component 1, and a second ground plate 3 stacked in sequence. The coupling component 1 is an ultra-wideband coupling component 1, which is based on broadband impedance matching technology and realizes the stable output of the forward signal and the isolation of the reverse signal on the basis of the high-pass filter prototype. The coupling component 1 cooperates with the first ground plate 2, the second ground plate 3, and the connector 4 to realize the odd-mode impedance and coupled-mode impedance required between the coupling lines, and meet the impedance matching with the coaxial output connector 4. The connector 4 is an interface for the directional coupler to be interconnected with the system, preferably a coaxial connector.

[0042] like Figure 2-Figure 4 As shown, the coupling assembly 1 includes a housing 11, a slot 12 is provided in the housing 11, a coupler inner conductor is provided in the slot 12, the coupler inner conductor includes a straight inner conductor 13 and a coupled inner conductor 14, the coupler inner conductor is a rectangular cross-section inner conductor without a substrate material, and both ends of the coupler inner conductor are connected to the connector 4. Along the path where the straight inner conductor 13 and the coupled inner conductor 14 are located, a plurality of through holes are provided on the side wall of the housing 11, and a first insulating support 15 for fixing the coupler inner conductor is provided in the through hole. One end of the first insulating support 15 is connected to the through hole, and the connection method thereof can be threaded connection with the housing 11 at the through hole, or the first insulating support 15 can be bonded and fixed in the through hole using insulating glue, and the other end of the first insulating support 15 is fixedly connected to the coupler inner conductor.

[0043] At both ends of the coupler inner conductor, in order to enhance the structural strength of the coupler inner conductor, a second insulating support 16 for fixing the coupler inner conductor is further provided in the housing 11. The second insulating support 16 is arranged opposite to the first insulating support 15 located at the end of the coupler inner conductor, and the coupler inner conductor is clamped between the first insulating support 15 and the second insulating support 16. A mounting portion 18 is provided in the coupling assembly 1, and a pressing block 17 for fixing the second insulating support 16 is provided in the mounting portion 18. A clamping groove 181 is provided in the pressing block 17 and the housing 11. One end of the second insulating support 16 is clamped between the pressing block 17 and the housing 11. A convex ring for blocking the axial movement of the second insulating support 16 is provided in the clamping portion of the second insulating support 16, and a matching annular groove is provided in the clamping groove 181 to prevent the second insulating support 16 from coming out of the clamping groove 181. Matching threaded holes are provided in the pressing block 17 and the mounting portion 18, respectively, and the pressing block 17 is installed in the mounting portion 18 by bolts.

[0044] A compensation groove 131 for improving impedance matching is provided at the connection between the inner conductor of the coupler and the first insulating support 15 or the second insulating support 16. The ends of the first insulating support 15 and the second insulating support 16 are bonded to the compensation groove 131 by insulating glue with moderate size and uniform shape.

[0045] like Figure 2 and Figure 5 As shown, the straight-through inner conductor 13 and the coupled inner conductor 14 are provided with coupling sections close to each other, and an isolation structure 21 is provided between the two inner conductors in the coupling section. The isolation mechanism is an isolation plate, which is fixedly arranged on the inner side of the first grounding plate 2 and / or the second grounding plate 3 to isolate the straight-through inner conductor 13 from part of the coupling section of the coupled inner conductor 14, avoid unnecessary coupling, improve isolation, and improve the directivity index of the directional coupler.

[0046] The maximum frequency of the ultra-wideband directional coupler using this fixed structure can reach 220GHz or even higher. As the working frequency of the coupler increases, the wavelength becomes shorter. In order to maintain a good coupling effect and reduce transmission loss, a thinner inner conductor is required to adapt to the characteristics of high-frequency electromagnetic waves. The cross-sectional dimensions of the straight-through inner conductor 13 and the coupled inner conductor 14 are at the millimeter level. The straight-through inner conductor 13 and the coupled inner conductor 14 are fixed by insulating support through insulating glue. There is no need to process tiny positioning holes in the coupled inner conductor 14 and the straight-through inner conductor 13 to fix the position of the straight-through inner conductor 13 and the coupled inner conductor 14 as in the prior art. While ensuring the stability of the fixed position of the straight-through inner conductor 13 and the coupled inner conductor 14, the processing difficulty of the straight-through inner conductor 13 and the coupled inner conductor 14 is reduced, and the strength of the straight-through inner conductor 13 and the coupled inner conductor 14 is improved.

[0047] like Figure 3 As shown, mounting holes 112 are provided at the input end and the output end of the housing 11, and the connector 4 is fixedly installed in the mounting holes 112. Figure 6-Figure 8 As shown, the connector 4 includes a connector outer conductor 41 and a connector inner conductor 42, and the connector inner conductor 42 is connected to the end face 132 of the end of the coupler inner conductor. As a first embodiment of the connection method of the connector 4, an elastic contact piece 422 is provided between the connector inner conductor 42 and the coupler inner conductor, and the connector inner conductor 42 and the coupler inner conductor are elastically interconnected through the elastic contact piece 422. As a second embodiment of the connection method of the connector 4, a protrusion 421 is provided in the end of the connector inner conductor 42, and a U-shaped groove 133 is provided in the end face 132. The protrusion 421 is plugged into the U-shaped groove 133 and fixed at the connection by welding or by conductive adhesive. The present invention reduces the difficulty of interconnection between the connector inner conductor 42 and the coupler inner conductor through elastic interconnection or plug-in interconnection, and provides more options for directional coupling packaging.

[0048] like Figure 1 , Figure 3 and Figure 5 As shown, a plurality of first threaded holes 113 are provided in the housing 11, and matching second threaded holes 22 are provided in the first grounding plate 2 and the second grounding plate 3, respectively. The housing 11 is connected to the first grounding plate 2 and the second grounding plate 3 by bolts.

[0049] Since the straight-through inner conductor 13 and the coupled inner conductor 14 are long transmission lines with slender rectangular cross-sections, they have slender shapes, high requirements for size and shape and position accuracy, and the surface of the parts affects the transmission quality. The relative position and size of the straight-through inner conductor 13 and the coupled inner conductor 14 have a key impact on various performance indicators of the coupler. However, using traditional processing methods, it is very difficult to process the straight-through inner conductor 13 and the coupled inner conductor 14 separately, and it is also difficult to ensure their relative position and size during the assembly process. In view of the structural characteristics of the coupling component 1, the present invention provides a method for preparing a coupling component. During the preparation process of the coupling component 1, the positions of the coupled inner conductor 14, the straight-through inner conductor 13 and the housing 11 are always kept integrated, thereby improving assembly accuracy and reducing assembly difficulty.

[0050] The specific steps of processing the coupling component 1 are:

[0051] S1: Obtain a workpiece, and perform milling on the workpiece to obtain an integrated part that connects the coupling inner conductor 14 and the through inner conductor 13 to the housing 11 through a process support 19;

[0052] like Fig. 9 As shown, a workpiece is obtained, and the workpiece is milled to obtain the main body size and main body contour of the straight inner conductor 13 and the coupled inner conductor 14. In order to prevent the straight inner conductor 13 and the coupled inner conductor 14 from being separated from the housing 11, a process support 19 is retained at the insulating support position, and a first threaded hole 113 is milled at a preset position to obtain an integrated part. The slot body 12, the straight inner conductor 13, the coupled inner conductor 14 and the process support 19 are completed in the same blank and the same process.

[0053] Furthermore, the surface of the integrated part is gold-plated to prevent corrosion and oxidation of the substrate, improve conductivity, and reduce insertion loss.

[0054] S2: embed the coupled inner conductor 14 and the straight inner conductor 13 of the integrated part into the fixing fixture 5, and use the pressing device 6 to press and fix the relative positions of the coupled inner conductor 14, the straight inner conductor 13 and the housing 11 in the integrated part.

[0055] The integrated parts are loaded into a fixing fixture 5, which is as shown in FIG. Fig.10 As shown, it includes a base 51 and a positioning block 52 disposed on the base 51. The positioning block 52 is provided with a coupling inner conductor positioning cavity 521 and a straight inner conductor positioning cavity 522 that match the shapes and positions of the coupling inner conductor 14 and the straight inner conductor 13, and a clearance groove 523 that matches the position of the process support 19. The size of the clearance groove 523 is larger than the size of the process support 19, leaving enough operating space for the removal of the process support 19 and the subsequent assembly of the insulating support. Fig.11 and Fig.12As shown, a third threaded hole 511 matching the first threaded hole 113 is provided in the fixing fixture 5. After the integrated part is installed in the fixing fixture 5, bolts are used to fix the relative positions of the integrated part and the fixing fixture 5. The coupling inner conductor 14 and the straight inner conductor 13 are respectively embedded in the coupling inner conductor positioning cavity 521 and the straight inner conductor positioning cavity 522. The depths of the coupling inner conductor positioning cavity 521 and the straight inner conductor positioning cavity 522 are less than the depths of the coupling inner conductor 14 and the straight inner conductor 13. A pressing device is provided on the integrated part. The pressing device presses and fixes the coupling inner conductor 14 and the straight inner conductor 13, and presses and fixes the coupling inner conductor 14 and the straight inner conductor 13 in the coupling inner conductor positioning cavity 521 and the straight inner conductor positioning cavity 522. The pressing device uses a plurality of pressing strips to press on the coupling inner conductor 14 and the straight inner conductor 13 to avoid blocking the process support 19.

[0056] S3: The process support 19 is removed by cutting, and a fixing hole 111 is formed on the side wall of the integrated part at the location of the process support 19 close to the outer wall of the shell 11 .

[0057] like Fig.13 As shown, the process support 19 is removed by cutting, and the compensation groove 131 of the straight inner conductor 13 and the coupled inner conductor 14 is formed in the process. When the process support 19 is removed, the straight inner conductor 13 and the coupled inner conductor 14 are fixed by the pressing device and the fixing fixture 5, and the straight inner conductor 13 and the coupled inner conductor 14 are kept in a fixed state in the coupled inner conductor positioning cavity 521 and the straight inner conductor positioning cavity 522, and the positions of the coupled inner conductor 14, the straight inner conductor 13 and the housing 11 are kept integrated. A fixing hole 111 is formed by machining the side wall of the integrated part at the location of the process support 19 close to the outer wall of the housing 11. A mounting hole 112 is formed by machining the ends of the straight inner conductor 13 and the coupled inner conductor 14.

[0058] Furthermore, a mounting portion 18 having a snap-in groove 181 is milled in the integrated part at a location of the process support 19 away from the outer wall of the housing 11 .

[0059] S4: Install the first insulating support 15 coated with insulating glue in the fixing hole 111 so that the first insulating support 15 fixes the relative position of the inner conductor of the coupler and the housing 11 .

[0060] like Fig.14 As shown, insulating glue is coated on the end of the first insulating support 15 and abutted against the compensation groove 131, and the first insulating support 15 is installed in the fixing hole 111. The connecting end of the first insulating support 15 and the shell 11 can be connected by threads or fixed by insulating glue.

[0061] Furthermore, one end of the second insulating support 16 is placed in the clamping groove 181 in the mounting portion 18, and the second insulating support 16 is clamped and fixed using a pressing block 17, and the pressing block 17 is fixedly installed in the mounting portion 18 using bolts, and the other end of the second insulating support 16 is coated with insulating glue and abuts against the compensation groove 131.

[0062] The first insulating support 15 and the second insulating support 16 keep the positions of the coupling inner conductor 14 , the through inner conductor 13 and the housing 11 integrated.

[0063] S5: After the fixing state of the first insulating support 15 is stabilized, the fixing fixture 5 and the pressing device 6 are removed.

[0064] The through inner conductor 13, coupled inner conductor 14 and housing 11 of the coupling assembly 1 are always kept in an integrated state during the processing, transportation, electroplating and assembly process, reducing the deformation of the through inner conductor 13 and the coupled inner conductor 14, and ensuring the position accuracy between the inner conductors and between the inner conductor and the housing. The assembly method adopts the traditional mechanical processing method, and can achieve the precision processing, precise positioning and packaging of tiny parts without increasing the high equipment cost of the new process line.

[0065] The coupling assembly 1 is manufactured through the above steps, and the first ground plate 2 and the second ground plate 3 are installed on both sides of the coupling assembly 1 manufactured through the above method, and the connector 4 is installed at the mounting hole 112 to complete the assembly of the directional coupler. When the inner conductor of the coupler is connected to the connector 4 by welding, the coupling assembly 1 is first assembled with the first ground plate 2, and then the coaxial output connector 4 is installed, the inner conductor welding is completed, and finally the second ground plate 3 is installed, which can provide sufficient operating space for the welding operation of the inner conductor.

[0066] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A coupling assembly, characterized in that: The invention comprises a shell (11), wherein a through slot (12) is arranged in the shell (11), a coupler inner conductor is arranged in the slot (12), the coupler inner conductor comprises a straight inner conductor (13) and a coupled inner conductor (14), a plurality of through holes are arranged on the side wall of the shell (11) along the path where the straight inner conductor (13) and the coupled inner conductor (14) are located, and a first insulating support (15) for fixing the straight inner conductor (13) and the coupled inner conductor (14) is arranged in the through hole.

2. The coupling assembly according to claim 1, characterized in that: One end of the first insulating support (15) is connected to the through hole, and the other end of the first insulating support (15) is coated with insulating glue and bonded to the inner conductor of the coupler. A compensation groove is provided in the inner conductor of the coupler at the bonding point between the inner conductor of the coupler and the first insulating support.

3. The coupling assembly according to claim 1, characterized in that: A second insulating support (16) is arranged opposite to the first insulating support (15) at the end of the coupler inner conductor, and the coupler inner conductor is clamped between the first insulating support (15) and the second insulating support (16).

4. The coupling assembly according to claim 3, characterized in that: The coupling assembly (1) is provided with a mounting portion (18), the mounting portion (18) being provided with a pressing block (17) for fixing the second insulating support (16), the pressing block (17) and the housing (11) being provided with a clamping groove (181) respectively, the pressing block (17) being mounted in the mounting portion (18) by means of bolts, one end of the second insulating support (16) being clamped between the pressing block (17) and the housing (11), the other end of the second insulating support (16) being coated with insulating glue and bonded to the inner conductor of the coupler, and a compensation groove being provided in the inner conductor of the coupler at the bonding point between the inner conductor of the coupler and the second insulating support.

5. A method for preparing a coupling component, characterized in that: include: S1: Obtain a workpiece, and perform milling on the workpiece to obtain an integrated part that connects the coupling inner conductor (14) and the straight inner conductor (13) to the housing (11) through a process support (19); S2: embedding the coupled inner conductor (14) and the straight inner conductor (13) of the integrated part into a fixing fixture (5), and using a pressing device (6) to press and fix the relative positions of the coupled inner conductor (14), the straight inner conductor (13) and the housing (11) in the integrated part; S3: removing the process support (19) by cutting, and forming a fixing hole (111) on the side wall of the integrated part at the location of the process support (19) close to the outer wall of the shell (11); S4: installing a first insulating support (15) coated with insulating glue in the fixing hole (111), so that the first insulating support (15) fixes the relative position of the conductor inside the coupler and the housing (11); S5: After the fixing state of the first insulating support (15) is stabilized, the fixing fixture (5) and the pressing device (6) are removed.

6. The method for preparing a coupling assembly according to claim 5, characterized in that: In step S3, a mounting portion (18) having a snap-in groove (181) is milled in the integrated part at a location of the process support (19) away from the outer wall of the housing (11).

7. The method for preparing a coupling assembly according to claim 6, characterized in that: In step S4, a second insulating support (16) having an end portion coated with insulating glue is installed in the clamping groove (181) in the installation portion (18), and a pressing block (17) is used to clamp and fix the second insulating support (16).

8. A coupler, characterized in that: It comprises a first grounding plate (2), a coupling assembly (1) as claimed in any one of claims 1 to 4, and a second grounding plate (3) which are stacked in sequence, and a connector (4) which is connected to the conductor inside the coupler is arranged on the outer wall of the coupling assembly (1).

9. The coupler according to claim 8, characterized in that The straight-through inner conductor (13) and the coupled inner conductor (14) are provided with coupling sections close to each other, and an isolation structure (21) is provided between the coupling section straight-through inner conductor (13) and the coupled inner conductor (14) in the first grounding plate (2) and / or the second grounding plate (3).

10. The coupler according to claim 8, characterized in that The connector (4) comprises a connector outer conductor (41) and a connector inner conductor (42), wherein the connector inner conductor (42) is connected to the coupler inner conductor, and the connection method is that the coupler inner conductor and the connector inner conductor (42) are elastically interconnected using an elastic contact piece (422); or the connection method is that matching protrusions (421) and U-shaped grooves (133) are respectively provided at the ends of the connector inner conductor (42) and the coupler inner conductor, and the protrusions (421) are inserted into the U-shaped grooves (133) and bonded by soldering or conductive adhesive.

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