High-temperature-resistant radio frequency transmission line

Abstract

The invention relates to a high-temperature-resistant radio frequency transmission line which comprises an antenna, a cover plate and a plurality of inner conductors, the plurality of inner conductors comprise a first inner conductor, a second inner conductor, a third inner conductor, a fourth inner conductor and a fifth inner conductor which are sequentially connected through point riveting, and the first inner conductor, the second inner conductor, the third inner conductor, the fourth inner conductor and the fifth inner conductor are all provided with outer conductors. The first inner conductor is connected with a radio frequency coaxial connector, the fifth inner conductor is connected with an antenna, and outer conductors of the third inner conductor and the fourth inner conductor are provided with cover plates; the overall structural form is a broken line type, the direction and distance of signal transmission can be considered, turning of signal transmission is achieved, and the transmission distance is longer; the inner conductor, the outer conductor, the insulating medium and other parts are all made of high-temperature-resistant materials, and the temperature-resistant range can meet the temperature-resistant requirement of 1200 DEG C; the connection mode between the outer conductors is laser seal welding, and the outer conductors are fused together by using the principle of similar compatibility of materials, so that reliable connection is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of connectors, and in particular to a high temperature resistant radio frequency transmission line. Background Art

[0002] In some special application scenarios, such as the flame spray area of ​​rockets, next to turbojet engines, hypersonic weapons, etc., a huge amount of heat will be generated. Electronic components working in such environments must meet the requirements of high temperature resistance. High-reliability RF coaxial connectors and components that are resistant to high temperatures, low losses, low standing waves, aging resistance, and long life can meet the above application scenarios. In these high-temperature resistant occasions, when the ambient temperature exceeds the temperature resistance range of the material, these RF transmission lines will fail due to the softening of the insulating medium and the high-temperature oxidation of the metal material, which will seriously affect the electrical performance and reliability of the RF transmission lines. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a high temperature resistant radio frequency transmission line.

[0004] In order to solve the problems in the above background technology, the present invention is implemented by the following technical solutions:

[0005] A high temperature resistant radio frequency transmission line comprises an antenna, a cover plate and a plurality of inner conductors, wherein the plurality of inner conductors comprise a first inner conductor, a second inner conductor, a third inner conductor, a fourth inner conductor and a fifth inner conductor, wherein the first inner conductor, the second inner conductor, the third inner conductor, the fourth inner conductor and the fifth inner conductor are all provided with an outer conductor, wherein the first inner conductor, the second inner conductor, the third inner conductor, the fourth inner conductor and the fifth inner conductor are connected in sequence by spot rivets, wherein the first inner conductor is connected to a radio frequency coaxial connector, the fifth inner conductor is connected to the antenna, and the outer conductors of the third inner conductor and the fourth inner conductor are provided with the cover plate.

[0006] Preferably, the outer conductor includes a first outer conductor, a second outer conductor, a third outer conductor, a fourth outer conductor, a fifth outer conductor, a sixth outer conductor and a seventh outer conductor;

[0007] The first outer conductor comprises a threaded end and a fixed end, the threaded end is provided with a thread on its outer periphery, the fixed end is provided with a fixing groove, a positioning step is provided inside the first outer conductor, a plug hole is provided at one end of the first inner conductor, a connecting groove is provided at the other end of the first inner conductor, a first insulator is provided at its outer periphery, a first bushing is provided at its outer periphery of the first insulator, a second bushing is provided at its outer periphery, the first inner conductor is inserted into the first outer conductor, and the second bushing is fixed by limiting the positioning step, the threaded end is connected to the housing of the RF coaxial connector, the plug hole is connected to the connecting end of the RF coaxial connector, the second outer conductor and the third outer conductor are inserted into the fixing groove and connected to the first outer conductor, the second inner conductor is inserted into the connecting groove and connected to the first inner conductor, and the outer periphery of the fixed end is a milled flat structure;

[0008] The second outer conductor is a slot-shaped structure, the second inner conductor is arranged in the second outer conductor, the third outer conductor is arranged at the upper end of the second outer conductor, the third outer conductor is buckled and connected with the second outer conductor, one end of the buckled third outer conductor and the second outer conductor is inserted into the fixing slot and connected with the first outer conductor, the other end of the second outer conductor is provided with a connecting ear, the buckled third outer conductor and the second outer conductor are connected to the cover plate through the connecting ear, one end of the second inner conductor is inserted into the connecting slot and connected with the first inner conductor, and the other end of the second inner conductor is connected with the third inner conductor;

[0009] The fifth outer conductor is arranged at the lower end of the third inner conductor, the fourth outer conductor is arranged at the upper end of the third inner conductor, the fifth outer conductor and the fourth outer conductor are connected by screws, one end of the third inner conductor is connected to the second inner conductor, and the other end of the third inner conductor is connected to the fourth inner conductor;

[0010] The cover plate includes an upper cover plate A, an upper cover plate B, a lower cover plate C and a lower cover plate D, wherein the upper cover plate A and the upper cover plate B, the lower cover plate C and the lower cover plate D, the upper cover plate A and the lower cover plate C, and the upper cover plate B and the lower cover plate D are respectively connected by screws; after the upper cover plate A and the lower cover plate C are connected, a first accommodating cavity is formed inside, the connecting ear, the fifth outer conductor after the connection and the fourth outer conductor are arranged in the first accommodating cavity, and after the upper cover plate B and the lower cover plate D are connected, a second accommodating cavity is formed inside, one end of the sixth outer conductor is arranged in the second accommodating cavity, and the other end of the sixth outer conductor is connected to the seventh outer conductor; one end of the seventh outer conductor is connected to the sixth outer conductor, and the other end of the seventh outer conductor is connected to the antenna by screws;

[0011] The fourth inner conductor is arranged in the sixth outer conductor, the fifth inner conductor is arranged in the seventh outer conductor, one end of the fourth inner conductor is connected to the third inner conductor, the other end of the fourth inner conductor is connected to the fifth inner conductor, and the other end of the fifth inner conductor is connected to the antenna.

[0012] Preferably, the first inner conductor is a circular structure, a limiting groove is provided on the outer circumference of the first inner conductor, and the first insulator is arranged in the limiting groove;

[0013] The jack is an elastic structure, and the elastic structure is a plurality of closed slots provided on the periphery of the jack;

[0014] The second inner conductor is a thin long strip folded line structure with a rectangular cross-section. The second inner conductor is provided with a plurality of slots. Second insulators are provided above and below the slots. The second insulator is an L-shaped structure. Compensation slots are provided at both ends of the slots. One end of the second inner conductor is inserted into the connecting slot and connected to the first inner conductor, and the other end of the second inner conductor is connected to the third inner conductor.

[0015] Preferably, the first insulator has a mounting hole at the center, and the first inner conductor passes through the mounting hole and is fixed by the limiting slot;

[0016] A plurality of through-type electrical holes are arranged on the periphery of the mounting hole, and compensation rings are arranged at the openings at both ends of the electrical holes.

[0017] Preferably, a docking groove is provided at one end of the third inner conductor, a connecting hole is provided at the other end of the third inner conductor, the second inner conductor is inserted into the docking groove and connected to the third inner conductor, a connecting needle is provided at one end of the fourth inner conductor, a connecting port is provided at the other end of the fourth inner conductor, the connecting needle is inserted into the connecting hole and connected to the third inner conductor, a docking needle is provided at one end of the fifth inner conductor, a microstrip needle is provided at the other end of the fifth inner conductor, the docking needle is inserted into the connecting port and connected to the fourth inner conductor, and the microstrip needle is connected to the antenna;

[0018] The connecting hole, the connecting needle, the connecting port and the docking needle are all provided with a correction slot.

[0019] Preferably, a third insulator is provided on the outer periphery of the connecting pin; a fourth insulator is provided on the outer periphery of the docking pin, a third bushing is provided on the outer periphery of the fourth insulator, the sixth outer conductor is provided with a fixed end and a docking end, the fixed end is arranged in the second accommodating cavity, a limit platform and a positioning platform are provided in the fixed end, the limit platform is used to limit the third insulator, the third bushing is inserted into the sixth outer conductor, and is positioned by the positioning platform; a connecting thread is provided on the inner periphery of the docking end, the outer periphery of the docking end is a milled flat structure, and the docking end is threadedly connected to the seventh outer conductor.

[0020] Preferably, a connection interface is provided at one end of the seventh outer conductor, a pre-tightening platform is provided on the end face of the connection interface, a docking thread is provided on the outer periphery of the connection interface, the connection interface is threadedly connected to the docking end, and the pre-tightening platform is used to pre-tighten the third bushing; a flange is provided at the other end of the seventh outer conductor, and the flange is connected to the antenna.

[0021] Preferably, the antenna is provided with a connecting plate, the connecting plate is connected to the mounting cavity, a feeding hole is provided in the antenna, the microstrip needle is inserted into the feeding hole and connected to the antenna, and the antenna is provided with an antenna cover.

[0022] Preferably, the third inner conductor, the fourth inner conductor and the fifth inner conductor are all circular coaxial structures.

[0023] Preferably, the first inner conductor is beryllium bronze, the first insulator is PEI polyetherimide, the first bushing and the second bushing are both 303 stainless steel; the first outer conductor, the second outer conductor, the third outer conductor, the fourth outer conductor, the fifth outer conductor, the sixth outer conductor, the seventh outer conductor, the cover plate, the second inner conductor, the third inner conductor, the fourth inner conductor, the fifth inner conductor, and the third bushing are all stainless steel; the second insulator, the third insulator, and the fourth insulator are silicon nitride ceramics;

[0024] The antenna is made of GH4099 nickel-based aged sheet alloy.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects:

[0026] 1. The first insulator is made of PEI polyetherimide, which has high strength and dimensional stability at high temperatures, low density and good consistency; it is used to separate the first inner conductor from the first outer conductor to prevent short circuit, and fix their relative position to prevent movement; since the dielectric constant of the first insulator as a dielectric support is greater than the dielectric constant of air, in order to ensure that the characteristic impedance of each cross section is the same at different media, electrical holes are designed in the first insulator to form a mixed medium of PEI+air, ​​and the impedance requirement is as close to 50 ohms as possible while ensuring sufficient support strength; since there is a discontinuous capacitor on the interface end face between the air medium and the first insulator, a part of the first insulator needs to be dug out on the interface end face to form a small inductor to compensate for the discontinuous capacitor and reduce reflection;

[0027] 2. The second inner conductor is a rectangular coaxial structure, and the point-riveted connection with the first inner conductor and the third inner conductor at both ends is "one square and one circle". Considering the transmission requirement of 50Ω electrical impedance, a compensation slot is set at the second inner conductor through electromagnetic simulation to form a small inductance to compensate for the discontinuous capacitance, reduce reflection, and ensure electrical indicators; due to the presence of dielectric support (dielectric constant is larger than that of air) between the second inner conductor, the second outer conductor and the third outer conductor, the wire diameter of at least one of the inner conductor / outer conductor at the dielectric support will change to meet the transmission requirement of 50Ω electrical impedance. Considering the machinability of the inner conductor / outer conductor, the wire diameter of the inner conductor at the dielectric support is reduced, that is, the width of the inner conductor is reduced at the corresponding position to form a slot for placing the second insulator; the second insulator is stepped and limited, and two second insulators are buckled on the second inner conductor one positive and one negative, and the second insulator is stepped and limited by the slot to facilitate installation and prevent the second insulator from moving along the axial direction during vibration; compensation slots are set on both sides of the slot to reduce reflection caused by dielectric changes.

[0028] 3. The overall structure is a broken line type, which can take into account the direction and distance of signal transmission and realize the turning of signal transmission. According to needs, a transmission line with a transmission angle of 90° to 180° can be produced, and the transmission distance is longer;

[0029] 4. The inner and outer conductors, insulating media and other components are all made of high temperature resistant materials (which can meet both high temperature environment and electrical performance requirements) and meet the temperature resistance requirement of 1200°C; specifically, there is a temperature gradient during use, and the antenna end meets the temperature resistance requirement of 1200°C, and the RF coaxial connector connection end meets the temperature resistance requirement of 200°C;

[0030] 5. The connection between the outer conductors is made by laser sealing. The outer conductors are melted together based on the principle of similar compatibility of materials to ensure reliable connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the present invention;

[0032] Figure 2 is a schematic structural diagram of the first inner conductor of the present invention;

[0033] Figure 3 The structure of the first outer conductor of the present invention is schematically shown in FIG. Figure 1 ;

[0034] Figure 4 The structure of the first outer conductor of the present invention is schematically shown in FIG. Figure 2 ;

[0035] Figure 5 It is a schematic diagram of the installation structure of the first inner conductor, the first insulator and the first bushing of the present invention;

[0036] Figure 6 The structure of the first insulator of the present invention is schematically shown in FIG. Figure 1 ;

[0037] Figure 7 The structure of the first insulator of the present invention is schematically shown in FIG. Figure 2 ;

[0038] Figure 8 It is a structural schematic diagram of the first bushing of the present invention;

[0039] Fig. 9 is a schematic structural diagram of the second bushing of the present invention;

[0040] Fig.10 is a schematic structural diagram of the second inner conductor of the present invention;

[0041] Fig.11 for Fig.10 A partial enlarged view of the middle A;

[0042] Fig.12 is a schematic structural diagram of the second outer conductor of the present invention;

[0043] Fig.13 is a schematic structural diagram of the third outer conductor of the present invention;

[0044] Fig.14 is a schematic structural diagram of a second insulator of the present invention;

[0045] Fig.15 It is a schematic diagram of the installation structure of the second inner conductor, the second insulator, the second outer conductor and the third outer conductor of the present invention;

[0046] Fig.16 is a schematic structural diagram of the third inner conductor of the present invention;

[0047] Fig.17 is a schematic structural diagram of a fourth inner conductor of the present invention;

[0048] Fig.18 is a schematic structural diagram of a fifth inner conductor of the present invention;

[0049] Fig.19 is a schematic structural diagram of a fourth outer conductor of the present invention;

[0050] Fig. 20 is a schematic structural diagram of a fifth outer conductor of the present invention;

[0051] Fig.21 is a schematic structural diagram of a sixth outer conductor of the present invention;

[0052] Fig. 22 is a schematic structural diagram of a seventh outer conductor of the present invention;

[0053] Fig.23 It is a structural schematic diagram of the upper cover plate A of the present invention;

[0054] Fig.24 It is a structural schematic diagram of the upper cover plate B of the present invention;

[0055] Fig.25 It is a structural schematic diagram of the lower cover plate C of the present invention;

[0056] Fig.26 It is a structural schematic diagram of the lower cover plate D of the present invention;

[0057] Fig. 27 The structure of the antenna of the present invention is shown in FIG. Figure 1 ;

[0058] Fig.28 The structure of the antenna of the present invention is shown in FIG. Figure 2 ;

[0059] Fig.29 It is a schematic diagram of the installation structure of the antenna and the installation cavity of the present invention.

[0060] Notes on the attached drawings:

[0061] 1. Antenna; 101. Connecting plate; 102. Mounting cavity; 103. Feeding hole; 104. Radome; 2. First inner conductor; 21. Jack; 22. Connecting slot; 23. First insulator; 231. Mounting hole; 232. Electrical hole; 233. Compensation ring; 24. First bushing; 25. Second bushing; 26. Limiting slot; 3. Second inner conductor; 31. Slot; 32. Second insulator; 33. Compensation slot; 4. Third inner conductor; 41. Docking slot; 42. Connecting hole; 43. Correction slot; 5. Fourth inner conductor; 51. Connecting pin; 52. Connecting port; 53. Third insulator; 6. Fifth inner conductor; 61. Docking pin; 62. Microstrip needle; 63, fourth insulator; 64, third bushing; 7, first outer conductor; 71, threaded end; 711, positioning step; 72, fixed end; 721, fixing groove; 8, second outer conductor; 81, connecting ear; 9, third outer conductor; 10, fourth outer conductor; 11, fifth outer conductor; 12, sixth outer conductor; 121, fixed end; 122, docking end; 123, limit platform; 124, positioning platform; 125, connecting thread; 13, seventh outer conductor; 131, connecting interface; 132, preload platform; 133, docking thread; 134, flange; 14, upper cover A; 15, upper cover B; 16, lower cover C; 17, lower cover D. DETAILED DESCRIPTION

[0062] Example 1

[0063] like Figure 1-Figure 29 As shown, a high temperature resistant radio frequency transmission line includes an antenna 1, a cover plate and a plurality of inner conductors, the plurality of inner conductors include a first inner conductor 2, a second inner conductor 3, a third inner conductor 4, a fourth inner conductor 5, and a fifth inner conductor 6, the first inner conductor 2, the second inner conductor 3, the third inner conductor 4, the fourth inner conductor 5, and the fifth inner conductor 6 are all provided with an outer conductor, the first inner conductor 2, the second inner conductor 3, the third inner conductor 4, the fourth inner conductor 5, and the fifth inner conductor 6 are connected in sequence by spot rivets, the first inner conductor 2 is connected to the radio frequency coaxial connector, the fifth inner conductor 6 is connected to the antenna 1, and the outer conductors of the third inner conductor 4 and the fourth inner conductor 5 are provided with a cover plate.

[0064] The outer conductor includes a first outer conductor 7, a second outer conductor 8, a third outer conductor 9, a fourth outer conductor 10, a fifth outer conductor 11, a sixth outer conductor 12 and a seventh outer conductor 13;

[0065] The first outer conductor 7 includes a threaded end 71 and a fixed end 72, the threaded end 71 is provided with a thread on its outer periphery, the fixed end 72 is provided with a fixing groove 721, a positioning step 711 is provided inside the first outer conductor 7, a plug hole 21 is provided at one end of the first inner conductor 2, a connecting groove 22 is provided at the other end of the first inner conductor 2, a first insulator 23 is provided on its outer periphery, a first bushing 24 is provided on its outer periphery, a second bushing 25 is provided on its outer periphery, the first inner conductor 2 is inserted into the first outer conductor 7, the second bushing 25 is fixed by limiting the position through the positioning step 711, the threaded end 71 is connected to the housing of the RF coaxial connector, the plug hole 21 is connected to the connecting end of the RF coaxial connector, the second outer conductor 8 and the third outer conductor 9 are inserted into the fixing groove 721 and connected to the first outer conductor 7, the second inner conductor 3 is inserted into the connecting groove 22 and connected to the first inner conductor 2, and the outer periphery of the fixed end 72 is a milled flat structure;

[0066] The second outer conductor 8 is a slot-shaped structure, the second inner conductor 3 is arranged in the second outer conductor 8, the third outer conductor 9 is arranged at the upper end of the second outer conductor 8, the third outer conductor 9 is buckled and connected with the second outer conductor 8, one end of the buckled third outer conductor 9 and the second outer conductor 8 is inserted into the fixing groove 721 and connected with the first outer conductor 7, the other end of the second outer conductor 8 is provided with a connecting ear 81, the buckled third outer conductor 9 and the second outer conductor 8 are connected to the cover plate through the connecting ear 81, one end of the second inner conductor 3 is inserted into the connecting groove 22 and connected with the first inner conductor, and the other end of the second inner conductor 3 is connected with the third inner conductor 4;

[0067] The fifth outer conductor 11 is disposed at the lower end of the third inner conductor 4, the fourth outer conductor 10 is disposed at the upper end of the third inner conductor 4, the fifth outer conductor 11 and the fourth outer conductor 10 are connected by screws, one end of the third inner conductor 4 is connected to the second inner conductor 3, and the other end of the third inner conductor 4 is connected to the fourth inner conductor 5;

[0068] The cover plate includes an upper cover plate A14, an upper cover plate B15, a lower cover plate C16 and a lower cover plate D17. The upper cover plate A14 is connected to the upper cover plate B15, the lower cover plate C16 is connected to the lower cover plate D17, the upper cover plate A14 is connected to the lower cover plate C16, and the upper cover plate B15 is connected to the lower cover plate D17. The first accommodating cavity is formed inside after the upper cover plate A14 is connected to the lower cover plate C16. The connecting ear 81, the fifth outer conductor 11 and the fourth outer conductor 10 after the connection are arranged in the first accommodating cavity. The second accommodating cavity is formed inside after the upper cover plate B15 is connected to the lower cover plate D17. One end of the sixth outer conductor 12 is arranged in the second accommodating cavity, and the other end of the sixth outer conductor 12 is connected to the seventh outer conductor 13; one end of the seventh outer conductor 13 is connected to the sixth outer conductor 12, and the other end of the seventh outer conductor 13 is connected to the antenna 1 through a screw;

[0069] A fourth inner conductor 5 is disposed in the sixth outer conductor 12 , a fifth inner conductor 6 is disposed in the seventh outer conductor 13 , one end of the fourth inner conductor 5 is connected to the third inner conductor 4 , the other end of the fourth inner conductor 5 is connected to the fifth inner conductor 6 , and the other end of the fifth inner conductor 6 is connected to the antenna 1 .

[0070] The first inner conductor 2 is a circular structure, and a limiting groove 26 is provided on the outer periphery of the first inner conductor 2, and the first insulator 23 is arranged in the limiting groove 26;

[0071] The plug hole 21 is an elastic structure, and the elastic structure is a plurality of closed slots provided on the outer periphery of the plug hole 21;

[0072] The second inner conductor 3 is a thin long strip folded line structure with a rectangular cross-section. The second inner conductor 3 is provided with a plurality of slots 31. Second insulators 32 are provided above and below the slots 31. The second insulator 32 is an L-shaped structure. Compensation slots 33 are provided at both ends of the slots 31. One end of the second inner conductor 3 is inserted into the connecting slot 22 and connected to the first inner conductor 2, and the other end of the second inner conductor 3 is connected to the third inner conductor 4.

[0073] The first insulator 23 has a mounting hole 231 at the center, and the first inner conductor 2 passes through the mounting hole 231 and is fixed by a limiting slot 26;

[0074] A plurality of through-type electrical holes 232 are disposed on the periphery of the mounting hole 231 , and compensation rings 233 are disposed at both ends of the electrical holes 232 .

[0075] A docking groove 41 is provided at one end of the third inner conductor 4, a connecting hole 42 is provided at the other end of the third inner conductor 4, the second inner conductor 3 is inserted into the docking groove 41 and connected to the third inner conductor 4, a connecting needle 51 is provided at one end of the fourth inner conductor 5, a connecting port 52 is provided at the other end of the fourth inner conductor 5, the connecting needle 51 is inserted into the connecting hole 42 and connected to the third inner conductor 4, a docking needle 61 is provided at one end of the fifth inner conductor 6, a microstrip needle 62 is provided at the other end of the fifth inner conductor 6, the docking needle 61 is inserted into the connecting port 52 and connected to the fourth inner conductor 5, and the microstrip needle 62 is connected to the antenna 1;

[0076] The connecting hole 42 , the connecting pin 51 , the connecting port 52 and the docking pin 61 are all provided with a correction slot 43 .

[0077] A third insulator 53 is provided on the outer periphery of the connecting needle 51; a fourth insulator 63 is provided on the outer periphery of the docking needle 61, a third bushing 64 is provided on the outer periphery of the fourth insulator 63, the sixth outer conductor 12 is provided with a fixed end 121 and a docking end 122, the fixed end 121 is provided in the second accommodating cavity, a limiting platform 123 and a positioning platform 124 are provided in the fixed end 121, the limiting platform 123 is used to limit the third insulator 53, the third bushing 64 is inserted into the sixth outer conductor 12, and is positioned by the positioning platform 124; a connecting thread 125 is provided on the inner periphery of the docking end 122, the outer periphery of the docking end 122 is a milled flat structure, and the docking end 122 is threadedly connected to the seventh outer conductor 13.

[0078] A connection interface 131 is provided at one end of the seventh outer conductor 13, a pre-tightening platform 132 is provided on the end face of the connection interface 131, a docking thread 133 is provided on the outer periphery of the connection interface 131, the connection interface 131 is threadedly connected to the docking end 122, and the pre-tightening platform 132 is used to pre-tighten the third bushing 64; a flange 134 is provided at the other end of the seventh outer conductor 13, and the flange 134 is connected to the antenna 1.

[0079] The antenna 1 is provided with a connecting plate 101 , which is connected to a mounting cavity 102 . A feeding hole 103 is provided in the antenna 1 . A microstrip needle 62 is inserted into the feeding hole 103 and connected to the antenna 1 . The antenna 1 is provided with an antenna cover 104 .

[0080] The third inner conductor 4, the fourth inner conductor 5 and the fifth inner conductor 6 are all circular coaxial structures.

[0081] The first inner conductor 2 is beryllium bronze, the first insulator 23 is PEI polyetherimide, the first bushing 24 and the second bushing 25 are both 303 stainless steel; the first outer conductor 7, the second outer conductor 8, the third outer conductor 9, the fourth outer conductor 10, the fifth outer conductor 11, the sixth outer conductor 12, the seventh outer conductor 13, the cover plate, the second inner conductor 3, the third inner conductor 4, the fourth inner conductor 5, the fifth inner conductor 6, and the third bushing 64 are all stainless steel; the second insulator 32 and the third insulator 53 are silicon nitride ceramics;

[0082] The second insulator 32, the third insulator 53 and the fourth insulator 63 are all silicon nitride ceramics. Silicon nitride ceramics are an inorganic material ceramic that does not shrink during sintering and has the properties of high strength, high hardness, low density, high temperature resistance, low thermal expansion coefficient, high thermal conductivity, and a stable dielectric constant.

[0083] Antenna 1 is GH4099 nickel-based aging sheet alloy.

[0084] Example 2

[0085] The installation process of the present invention:

[0086] 1. First, install the first insulator 23 into the first inner conductor 2, and then press the first bushing 24 into the first insulator;

[0087] 2. Connect the second inner conductor 3 to the first inner conductor 2 by uniform four-point riveting;

[0088] 3. Install the first inner conductor 2 into the first outer conductor 7, and press the second bushing 25 into the first outer conductor 7;

[0089] 4. Snap the second insulator 32 into the slot 31 on the second inner conductor 3 in a positive and negative direction;

[0090] 5. Place the second inner conductor 3 into the second outer conductor 8, and buckle the third outer conductor 9 onto the upper end of the second outer conductor 8;

[0091] 6. Install the seventh outer conductor 13 on the antenna 1 with screws, and then press the microstrip needle 62 of the fifth inner conductor 6 into the feeding hole 103 of the antenna 1;

[0092] 7. Insert the fourth insulator 63 into the fifth inner conductor 6, install the third bushing 64 into the fourth insulator 63, and then insert the fourth inner conductor 5 into the fifth inner conductor 6, and perform four-point riveting;

[0093] 8. Screw the sixth outer conductor 12 into the seventh outer conductor 13, insert the third insulator 53 into the fourth inner conductor 5, and then install the third inner conductor 4 into the fourth inner conductor 5, and perform four-point riveting;

[0094] 9. Rivet the second inner conductor 3 and the third inner conductor 4 at four points;

[0095] 10. Assemble and install the fourth outer conductor 10 and the fifth outer conductor 11;

[0096] 11. Assemble and install the upper cover A14, upper cover B15, lower cover C16 and lower cover D17;

[0097] 12. After testing the electrical performance and confirming that the indicators are qualified, laser seal the gaps between all parts and complete the assembly.

Claims

1. A high temperature resistant radio frequency transmission line, characterized in that: The invention comprises an antenna (1), a cover plate and a plurality of inner conductors, wherein the plurality of inner conductors comprise a first inner conductor (2), a second inner conductor (3), a third inner conductor (4), a fourth inner conductor (5) and a fifth inner conductor (6); the first inner conductor (2), the second inner conductor (3), the third inner conductor (4), the fourth inner conductor (5) and the fifth inner conductor (6) are all provided with an outer conductor; the first inner conductor (2), the second inner conductor (3), the third inner conductor (4), the fourth inner conductor (5) and the fifth inner conductor (6) are connected in sequence by spot rivets; the first inner conductor (2) is connected to a radio frequency coaxial connector; the fifth inner conductor (6) is connected to the antenna (1); and the outer conductors of the third inner conductor (4) and the fourth inner conductor (5) are provided with the cover plate.

2. The high temperature resistant radio frequency transmission line according to claim 1, characterized in that: The outer conductors include a first outer conductor (7), a second outer conductor (8), a third outer conductor (9), a fourth outer conductor (10), a fifth outer conductor (11), a sixth outer conductor (12) and a seventh outer conductor (13); The first outer conductor (7) comprises a threaded end (71) and a fixed end (72), the threaded end (71) is provided with a thread on its outer periphery, the fixed end (72) is provided with a fixing groove (721), a positioning step (711) is provided inside the first outer conductor (7), a plug hole (21) is provided at one end of the first inner conductor (2), a connecting groove (22) is provided at the other end of the first inner conductor (2), a first insulator (23) is provided on its outer periphery, a first bushing (24) is provided on its outer periphery of the first insulator (23), a second bushing (25) is provided on its outer periphery of the first bushing (24), and a second bushing (26) is provided on its outer periphery. ), the first inner conductor (2) is inserted into the first outer conductor (7), the second bushing (25) is fixed by the positioning step (711), the threaded end (71) is connected to the housing of the radio frequency coaxial connector, the jack (21) is connected to the connecting end of the radio frequency coaxial connector, the second outer conductor (8) and the third outer conductor (9) are inserted into the fixing groove (721) and connected to the first outer conductor (7), the second inner conductor (3) is inserted into the connecting groove (22) and connected to the first inner conductor (2), and the outer periphery of the fixing end (72) is a milled flat structure; The second outer conductor (8) is a slot-shaped structure, the second inner conductor (3) is arranged in the second outer conductor (8), the third outer conductor (9) is arranged at the upper end of the second outer conductor (8), the third outer conductor (9) and the second outer conductor (8) are buckled and connected, and after buckling, one end of the third outer conductor (9) and the second outer conductor (8) are inserted into the fixing groove (721) and connected to the first outer conductor (7), and the other end of the second outer conductor (8) is provided with a connecting ear (81), and after buckling, the third outer conductor (9) and the second outer conductor (8) are connected to the cover plate through the connecting ear (81), one end of the second inner conductor (3) is inserted into the connecting groove (22) and connected to the first inner conductor, and the other end of the second inner conductor (3) is connected to the third inner conductor (4); The fifth outer conductor (11) is arranged at the lower end of the third inner conductor (4), the fourth outer conductor (10) is arranged at the upper end of the third inner conductor (4), the fifth outer conductor (11) and the fourth outer conductor (10) are connected by screws, one end of the third inner conductor (4) is connected to the second inner conductor (3), and the other end of the third inner conductor (4) is connected to the fourth inner conductor (5); The cover plate comprises an upper cover plate A (14), an upper cover plate B (15), a lower cover plate C (16) and a lower cover plate D (17); the upper cover plate A (14) and the upper cover plate B (15), the lower cover plate C (16) and the lower cover plate D (17), the upper cover plate A (14) and the lower cover plate C (16), and the upper cover plate B (15) and the lower cover plate D (17) are connected by screws respectively; after the upper cover plate A (14) and the lower cover plate C (16) are connected, a first accommodating cavity is formed inside, and the connecting ear (81 ), the connected fifth outer conductor (11) and the fourth outer conductor (10) are arranged in the first accommodating cavity, the upper cover plate B (15) and the lower cover plate D (17) are connected to form a second accommodating cavity inside, one end of the sixth outer conductor (12) is arranged in the second accommodating cavity, and the other end of the sixth outer conductor (12) is connected to the seventh outer conductor (13); one end of the seventh outer conductor (13) is connected to the sixth outer conductor (12), and the other end of the seventh outer conductor (13) is connected to the antenna (1) through a screw; The fourth inner conductor (5) is arranged inside the sixth outer conductor (12), the fifth inner conductor (6) is arranged inside the seventh outer conductor (13), one end of the fourth inner conductor (5) is connected to the third inner conductor (4), the other end of the fourth inner conductor (5) is connected to the fifth inner conductor (6), and the other end of the fifth inner conductor (6) is connected to the antenna (1).

3. The high temperature resistant radio frequency transmission line according to claim 2, characterized in that: The first inner conductor (2) is of a circular structure, a limiting groove (26) is provided on the outer circumference of the first inner conductor (2), and the first insulator (23) is arranged in the limiting groove (26); The insertion hole (21) is an elastic structure, and the elastic structure is a plurality of closed-end grooves provided on the outer periphery of the insertion hole (21); The second inner conductor (3) is a thin long strip folded line structure with a rectangular cross section. The second inner conductor (3) is provided with a plurality of slots (31). Second insulators (32) are provided above and below the slots (31). The second insulator (32) is an L-shaped structure. Compensation slots (33) are provided at both ends of the slots (31). One end of the second inner conductor (3) is inserted into the connection slot (22) to be connected to the first inner conductor (2), and the other end of the second inner conductor (3) is connected to the third inner conductor (4).

4. The high temperature resistant radio frequency transmission line according to claim 3, characterized in that: The first insulator (23) is provided with a mounting hole (231) at the center thereof, and the first inner conductor (2) passes through the mounting hole (231) and is fixed in position by the limiting slot (26); A plurality of through-type electrical holes (232) are provided on the outer periphery of the mounting hole (231), and compensation rings (233) are provided at the openings at both ends of the electrical holes (232).

5. The high temperature resistant radio frequency transmission line according to claim 3, characterized in that: The third inner conductor (4) is provided with a docking groove (41) at one end, and a connecting hole (42) at the other end of the third inner conductor (4); the second inner conductor (3) is inserted into the docking groove (41) to be connected to the third inner conductor (4); the fourth inner conductor (5) is provided with a connecting pin (51) at one end, and a connecting port (52) at the other end; the connecting pin (51) is inserted into the connecting hole (42) to be connected to the third inner conductor (4); the fifth inner conductor (6) is provided with a docking pin (61) at one end, and a microstrip pin (62) at the other end of the fifth inner conductor (6); the docking pin (61) is inserted into the connecting port (52) to be connected to the fourth inner conductor (5); and the microstrip pin (62) is connected to the antenna (1); The connection hole (42), the connection needle (51), the connection port (52) and the docking needle (61) are all provided with a correction slot (43).

6. The high temperature resistant radio frequency transmission line according to claim 5, characterized in that: A third insulator (53) is provided on the outer periphery of the connecting needle (51); a fourth insulator (63) is provided on the outer periphery of the docking needle (61); a third bushing (64) is provided on the outer periphery of the fourth insulator (63); the sixth outer conductor (12) is provided with a fixed end (121) and a docking end (122); the fixed end (121) is arranged in the second accommodating cavity; a limiting platform (123) and a positioning platform (124) are provided in the fixed end (121); the limiting platform (123) is used to limit the third insulator (53); the third bushing (64) is inserted into the sixth outer conductor (12) and is positioned by the positioning platform (124); a connecting thread (125) is provided on the inner periphery of the docking end (122); the outer periphery of the docking end (122) is a milled flat structure; the docking end (122) is threadedly connected to the seventh outer conductor (13).

7. The high temperature resistant radio frequency transmission line according to claim 6, characterized in that: The seventh outer conductor (13) is provided with a connection interface (131) at one end, a pre-tightening platform (132) is provided on the end surface of the connection interface (131), a docking thread (133) is provided on the outer periphery of the connection interface (131), the connection interface (131) is threadedly connected to the docking end (122), and the pre-tightening platform (132) is used to pre-tighten the third bushing (64); the other end of the seventh outer conductor (13) is provided with a flange (134), and the flange (134) is connected to the antenna (1).

8. The high temperature resistant radio frequency transmission line according to claim 7, characterized in that: The antenna (1) is provided with a connecting plate (101), the connecting plate (101) is connected to a mounting cavity (102), a feeding hole (103) is provided in the antenna (1), the microstrip needle (62) is inserted into the feeding hole (103) and connected to the antenna (1), and the antenna (1) is provided with an antenna cover (104).

9. The high temperature resistant radio frequency transmission line according to claim 1, characterized in that: The third inner conductor (4), the fourth inner conductor (5) and the fifth inner conductor (6) are all circular coaxial structures.

10. The high temperature resistant radio frequency transmission line according to claim 8, characterized in that: The first inner conductor (2) is made of beryllium bronze, the first insulator (23) is made of PEI polyetherimide, the first bushing (24) and the second bushing (25) are both made of 303 stainless steel; the first outer conductor (7), the second outer conductor (8), the third outer conductor (9), the fourth outer conductor (10), the fifth outer conductor (11), the sixth outer conductor (12), the seventh outer conductor (13), the cover plate, the second inner conductor (3), the third inner conductor (4), the fourth inner conductor (5), the fifth inner conductor (6), and the third bushing (64) are all made of stainless steel; the second insulator (32), the third insulator (53), and the fourth insulator (63) are made of silicon nitride ceramics; The antenna (1) is made of GH4099 nickel-based aging plate alloy.

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