Waveguide, coaxial cable waveguide side feed structure and coaxial waveguide converter
By optimizing the stepped blocks and mounting hole settings of the waveguide structure, the problem of insufficient power tolerance of traditional side-fed waveguide coaxial converters under high power and low pressure environments has been solved, achieving a significant improvement in power capacity and reliability.
Patent Information
- Application Number
- CN202510877444.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2025-11-18
AI Technical Summary
Traditional side-fed waveguide coaxial converters have insufficient power handling capacity in high-power applications and insufficient reliability in low-pressure environments.
The stepped block of the traditional waveguide structure is decomposed into a first metal support and a short-circuit block. The spacing and setting of the mounting holes are optimized to ensure that the distance between the first metal support and the narrow side of the waveguide opening is not less than two-thirds, the distance from the central axis to the short-circuit surface is not less than one-quarter of the wavelength, and an insulating layer is used as the filling medium.
It significantly improves power capacity, increases power tolerance by at least eight times, adapts to the requirements of high power and low pressure environments, and improves power reliability at the user end.
Smart Images
Figure CN120978376A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of radio frequency coaxial and waveguide side feed technology, in particular to a waveguide, coaxial cable waveguide side feed structure and coaxial waveguide converter. BACKGROUND
[0002] The matching of radio frequency coaxial (RF Coaxial) and rectangular waveguide is to efficiently couple the electromagnetic wave energy of the coaxial transmission line (TEM mode) to the rectangular waveguide (TE10 mode), and the implementation method is to use a probe or a stepped block to radiate at the center of the wide side of the waveguide tube to excite the TE10 main mode in the waveguide, and the axial electric field distribution matches the electric field distribution of the TE10 mode (sinusoidal distribution along the wide side), thereby achieving efficient coupling. Among them, the probe coupling is that the inner conductor of the coaxial line is suspended in the waveguide cavity, and the electric field is excited by changing the length of the probe and the position of the short circuit block. The outer conductor of the coaxial line is in conductive relationship with the waveguide tube, and the inner and outer conductors of the coaxial line are not in conductive relationship, which is suitable for small power or no power environment. Among them, the stepped block coupling uses two to three stepped blocks of different lengths and heights to cooperate with the position of the short circuit block to excite the electric field, and the inner conductor of the coaxial line, the outer conductor of the coaxial line and the stepped block are in conductive relationship with the waveguide tube, which is suitable for occasions with power and low pressure environment requirements. It is the most mature large power side feed waveguide coaxial conversion scheme at present.
[0003] The present application aims to solve the side feed waveguide coaxial conversion in larger power use occasions, so based on the case of stepped block exciting electric field, optimization analysis and verification are carried out. As shown in Figure 2 , the waveguide port size is defined as the wide side A x the narrow side B, and the side feed rectangular waveguide converter is taken as an example to match the radio frequency coaxial cable, wherein the wide side refers to the length of the rectangle, and the narrow side refers to the width of the rectangle. In this case, a two-step stepped block 3 is used for feeding, wherein the distance between the first step 31 and the right side wall of the waveguide port 14 is about 1 / 3 of the narrow side B size of the waveguide port 14, the height of the short circuit surface 15 of the short circuit block from the coaxial center is about 1 / 4 wavelength, and the height of the lower end surface of the first step 31 from the coaxial center is about 1 / 8 wavelength. In this structure, the spacing B / 3 is equivalent to the equivalent waveguide port wide side size after the feeding conversion, and it can be seen from the simulation software (such as HFSS) that the electric field is concentrated at the right side of the first step 31 and the lower side of the coaxial line, so the equivalent narrow side size B of the waveguide port 14 becomes smaller. Figure 3
[0004] Furthermore, when the waveguide cavity is filled with air or other dielectrics, the breakdown field strength of the dielectric directly affects the power withstand capability. If there is partial dielectric support inside the waveguide, these areas may become points of electric field concentration, leading to localized breakdown and reducing the overall power withstand capability. In this case, the waveguide cavity is filled with air, and the breakdown field strength of air is 3 × 10⁻⁶. 6 The voltage field strength (V / m) is lower than that of other supporting media. Since arcing at high power is generally caused by breakdown between the inner and outer conductors, the power withstand capability of the side-fed waveguide coaxial converter is reduced to a certain extent compared with that of a pure waveguide.
[0005] Therefore, a new waveguide structure scheme is needed to address the significant derating of the power capacity of traditional side-fed waveguide coaxial converters compared to pure waveguides, while ensuring high power tolerance and adapting to the requirements of low-pressure, high-power environments. Summary of the Invention
[0006] The purpose of this invention is to solve the above-mentioned technical problems and provide a waveguide, coaxial cable waveguide side-feed structure, and coaxial waveguide converter. The traditional waveguide structure's stepped block is decomposed into a first metal support and a short-circuit block to achieve performance matching. The distance between the first metal support (first mounting hole) and the second mounting port (side wall of the waveguide port) is not less than two-thirds of the narrow side of the waveguide port. The distance from the central axis of the first metal support (first mounting hole) to the short-circuit surface is not less than one-quarter of the wavelength λ. Through the optimization of this structure, the conversion power capacity is increased by at least eight times compared to traditional high-power solutions, exhibiting greater power tolerance. In situations where user-end power capacity requirements are high or in low-pressure environments, its power reliability will be significantly improved.
[0007] To achieve the above objectives, the present invention provides the following solution: The present invention discloses a waveguide, including a waveguide tube, wherein the waveguide tube has a rectangular waveguide opening, one end of the waveguide opening is provided with a short-circuit block for forming a short path, and a first mounting opening and a second mounting opening are respectively provided on the two wide sides of the waveguide tube, the first mounting opening and the second mounting opening are both connected to the waveguide opening, a first metal support is embedded in the first mounting opening, the first metal support is provided with a first mounting hole, the first mounting hole is for mounting the core wire area of the stripped RF cable to the core wire or the coaxial inner conductor of the coaxial connector, the first mounting hole is coaxially arranged with the second mounting opening, the distance between the first mounting hole and the second mounting opening is not less than two-thirds of the narrow side of the waveguide opening, and the distance from the central axis of the first mounting hole to the short path is not less than one-quarter of the wavelength, a second metal support is installed in the second mounting opening, the second metal support is provided with a second mounting hole, the second mounting hole is coaxially arranged with the second mounting opening, the second mounting hole is for mounting the unstripped section of the RF cable or the coaxial outer conductor of the coaxial connector.
[0008] Preferably, the first mounting hole includes a core wire mounting section and an insulation mounting section. The insulation mounting section is located between the core wire mounting section and the second mounting port. The core wire mounting section is for mounting the core wire area or the inner conductor of the coaxial connector. The insulation mounting section and the second mounting port are both for mounting the insulation layer area or the insulating medium of the coaxial connector.
[0009] Preferably, the first metal support is a first nut.
[0010] Preferably, the first nut is threadedly connected to the first mounting port.
[0011] Preferably, the second metal support includes a second nut.
[0012] Preferably, the second nut is threaded onto the second mounting port.
[0013] The present invention also discloses a coaxial cable waveguide side-feed structure, including an RF cable and the waveguide described above. The RF cable includes a stripped section and an unstripped section arranged along the axial direction. The stripped section includes a core wire region stripped to the core wire. The core wire region is embedded in a first mounting hole. The unstripped section is embedded in a second mounting hole of the waveguide.
[0014] Preferably, the stripped section further includes an insulating layer region stripped to the insulating layer, the insulating layer region being located axially between the core wire region and the unstripped section, the core wire region being embedded in the core wire embedding section of the waveguide, and the insulating layer region being embedded into the insulating embedding section by the second mounting port of the waveguide.
[0015] The present invention also discloses a coaxial waveguide converter, including a coaxial connector and the waveguide described above. The coaxial connector includes a coaxial inner conductor and a coaxial outer conductor arranged sequentially from the inside to the outside. The coaxial outer conductor is embedded in a first mounting hole of the waveguide and the coaxial outer conductor is embedded in a second mounting hole of the waveguide.
[0016] Preferably, the coaxial connector further includes an insulating medium located between the inner coaxial conductor and the outer coaxial conductor, wherein the inner coaxial conductor is embedded in the core wire mounting section of the waveguide, and the insulating medium is embedded into the insulating mounting section through the second mounting port of the waveguide.
[0017] The present invention achieves the following technical effects compared to the prior art:
[0018] In this invention, the stepped block of a traditional waveguide structure is decomposed into a first metal support and a short-circuit block to achieve performance matching. The first metal support is used to embed the stripped core wire of the RF cable or the coaxial inner conductor of the coaxial connector. The second metal support is used to embed the unstripped section of the RF cable or the coaxial outer conductor of the coaxial connector. The distance between the first metal support (first mounting hole) and the second mounting port (side wall of the waveguide port) is not less than two-thirds of the narrow side of the waveguide port. The distance from the central axis of the first metal support (first mounting hole) to the short-circuit surface is not less than one-quarter of the wavelength λ. Through the optimization of this structure, the conversion power capacity is increased by at least eight times compared with the traditional high-power solution, and it has a large power tolerance. In situations where the power capacity requirement at the user end is large or there is a low-pressure environment, its power reliability will be significantly improved.
[0019] Other solutions of the present invention achieve the following technical effects compared with the prior art:
[0020] The first mounting hole within the first metal component is divided into a core wire mounting section and an insulation mounting section. The core wire of the RF cable or the inner conductor of the coaxial cable is mounted in the core wire mounting section. The insulation layer of the RF cable or the insulating medium of the coaxial connector is mounted in the insulating mounting section and the second mounting port. The insulation layer serves as the filling medium within the waveguide port. Compared to air, the dielectric breakdown field strength of the insulation layer is several times that of air, resulting in a significant increase in its power handling capacity compared to traditional waveguide structures. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained by analyzing these drawings without creative effort.
[0022] Figure 1 This is a partial cross-sectional view of the coaxial cable waveguide side-feed structure in an embodiment of the present invention.
[0023] Figure 2 This is a partial cross-sectional schematic diagram of a traditional coaxial cable waveguide side-feed structure.
[0024] Figure 3 The figure shows the simulation results of the coaxial conversion electric field intensity of the side-fed waveguide in the embodiment of the present invention.
[0025] Figure 4 The figure shows the simulation results of the electric field intensity of the coaxial conversion of a traditional side-fed waveguide.
[0026] Explanation of reference numerals in the attached figures:
[0027] 1. Waveguide;
[0028] 11. Waveguide; 12. First nut; 13. Second nut; 14. Waveguide port; 15. Short surface; 16. Second mounting port;
[0029] 2. Radio frequency cable;
[0030] 21. Core wire area; 22. Insulation layer area; 23. Unstripped section;
[0031] 3. Stepped blocks;
[0032] 31. First step; 32. Second step. Detailed Implementation
[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0034] The purpose of this invention is to provide a waveguide, coaxial cable waveguide side-feed structure, and coaxial waveguide converter to solve the problems existing in the prior art. The traditional waveguide structure's stepped block is decomposed into a first metal support and a short-circuit block to achieve performance matching. The first metal support is used to embed the stripped core wire of the RF cable or the coaxial inner conductor of the coaxial connector. The second metal support is used to embed the unstripped section of the RF cable or the coaxial outer conductor of the coaxial connector. The distance between the first metal support (first embedding hole) and the second mounting port (side wall of the waveguide port) is not less than two-thirds of the narrow side of the waveguide port. The distance from the central axis of the first metal support (first embedding hole) to the short-circuit surface is not less than one-quarter of the wavelength λ. Through the optimization of this structure, the conversion power capacity is increased by at least eight times compared to traditional high-power solutions, exhibiting greater power tolerance. In applications with high power capacity requirements at the user end or in low-pressure environments, its power reliability will be significantly improved.
[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0036] Example 1
[0037] like Figures 1 to 4As shown, this embodiment provides a waveguide. The waveguide 1 includes a waveguide 11 with a rectangular waveguide opening 14. The dimensions of the waveguide opening 14 are defined as wide side A × narrow side B, where the wide side refers to the length of the rectangle and the narrow side refers to the width of the rectangle. A short-circuit block is provided at one end of the waveguide opening 14 to form a short-circuit surface 15 at that end. A first mounting port (not shown) and a second mounting port 16 are respectively provided on the two wide side surfaces (the surface containing the wider side), both communicating with the waveguide opening 14. A first metal support (such as a first nut 12) is embedded in the first mounting port. The first metal support has a first mounting hole (not shown) for embedding the core wire region 21 of the RF cable 2 stripped to the core wire or for embedding the coaxial inner conductor of the coaxial connector. The first mounting hole and the second mounting port 16 are coaxially arranged. The distance between the first mounting hole (the right end face of the first metal support) and the second mounting port 16 (the right end face of the waveguide port 14) is not less than two-thirds of the narrow side B of the waveguide port 14. The distance from the central axis of the first mounting hole to the short surface 15 is not less than one-quarter of the wavelength λ. A second metal support (such as the second nut 13) is installed outside the second mounting port 16. The second metal support has a second mounting hole (not shown) inside. The second mounting hole is coaxially arranged with the second mounting port 16. The second mounting hole is used for mounting the unstripped section of the RF cable 2 (the area of the RF cable 2 that has not been stripped) or for mounting the coaxial outer conductor of the coaxial connector.
[0038] In this example, the microwave frequency required by the user is in the Ka band, which has been confirmed through simulation using CST software (CST StudioSuite) and HFSS software (High Frequency Structure Simulator). Figure 4 As shown), because the height of the short surface 15 from the coaxial center is not less than 1 / 4 wavelength λ, and... Figure 2 In traditional schemes, the distances are the same, but the distance between the right end face of the first metal support and the right end face of the waveguide port 14 is not less than 2 / 3 of the narrow side dimension B of the waveguide port 14. Figure 2 Based on the traditional scheme, the spacing has been doubled. Theoretically, with the increase in the narrow side size of the waveguide port 14, its power capacity will increase.
[0039] In one embodiment, the first mounting hole includes a core wire mounting section and an insulation mounting section. The insulation mounting section is located between the core wire mounting section and the second mounting port 16. The core wire mounting section is for mounting the core wire region 21 of the RF cable 2 or the inner conductor of the coaxial cable. Both the insulation mounting section and the second mounting port 16 are for mounting the insulation layer region 22 of the RF cable 2 or for mounting the insulating medium of the coaxial connector.
[0040] The analysis will focus on the dielectric filling within waveguide port 14.Figure 1 In this design, the filling medium within waveguide port 14 is the insulation layer (insulation layer region 22) of the RF cable 2. The dielectric breakdown field strength of the insulation layer is several times that of air. For example, the dielectric breakdown field strength of commonly used polytetrafluoroethylene (PTFE) film-wrapped insulation material is 22 × 10⁻⁶. 6 V / m, which is 7.33 times the breakdown field strength of air. This was achieved using simulation software (such as...). Figure 3 As shown, the electric field is concentrated on the right end face of the first nut 12 and the lower side of the insulation layer area 22 of the coaxial cable. The arcing that occurs at high power is generally due to the breakdown between the inner and outer conductors, that is, between the cable core (core area 21) and the first nut 12. Since this part is filled with insulation layer (insulation layer area 22), its power carrying capacity will be greatly improved compared with the traditional structure.
[0041] In one embodiment, the first metal support is the first nut 12, but other metal components, such as a metal sleeve, can also be used.
[0042] In one embodiment, the first nut 12 is threadedly connected to the first mounting port.
[0043] In one embodiment, the second metal support is the second nut 13, but other metal components may also be used.
[0044] In one embodiment, the second nut 13 is threaded onto the second mounting port 16.
[0045] In one embodiment, the waveguide 11 is a standard rectangular waveguide. Preferably, a rectangular waveguide of model BJ320 (WR28) can be used, with the waveguide port 14 having dimensions of 7.112 mm wide side × 3.556 mm narrow side, suitable for UFB142A RF cables.
[0046] Example 2
[0047] like Figures 1 to 4 As shown, this embodiment provides a coaxial cable waveguide side-feed structure, including an RF cable 2 and a waveguide 1 as described in Embodiment 1. The RF cable 2 includes a stripped section and an unstripped section 23 arranged axially. The stripped section includes a core wire region 21 stripped to the core wire, which is fitted into a first mounting hole of a first metal support member (such as a first nut 12) of the waveguide 1. The unstripped section 23 is fitted into a second mounting hole (not shown) of a second metal support member (such as a second nut 13).
[0048] In one embodiment, the stripped section further includes an insulating layer region 22 stripped to the insulating layer, the insulating layer region 22 being located axially between the core wire region 21 and the unstripped section 23. The core wire region 21 is embedded within the core wire mounting section of the waveguide 1, and the insulating layer region 22 is embedded into the insulating mounting section through the second mounting port 16 of the waveguide 1.
[0049] In one embodiment, the insulating layer is a polytetrafluoroethylene film wrapping structure.
[0050] CST electric field simulation results:
[0051] In this case: Waveguide 11 is a BJ320(WR28) waveguide, and the dimensions of waveguide port 14 are 7.112cm wide x 3.556cm narrow. RF cable 2 is a UFB142A RF cable with a polytetrafluoroethylene (PTFE) film wrapping structure for its insulation layer.
[0052] In this case, the waveguide is used in a low-pressure environment (20 kPa), with a peak power tolerance of 600 W, and operates in the Ka band. Based on a traditional structure (reference...), Figure 2 ) and the coaxial cable waveguide side-feed structure (reference) Figure 1 This section describes the simulation and power optimization based on electric field strength.
[0053] like Figure 3 and Figure 4 As shown, with waveguide 11 being a BJ320, the same connecting cable, and the same simulation frequency band, when a peak power of 600W is input at the waveguide end, the maximum electric field strength in the conventional RF cable-to-waveguide conversion structure is 2.04 × 10⁻⁶. 6 V / m (reference) Figure 3 The maximum electric field strength of this coaxial cable waveguide-side-fed structure is 7.15 × 10⁻⁶. 5 V / m (reference) Figure 4 Its electric field strength is reduced by 65% compared to the traditional structure, which translates to a power withstand capability of: P1 / P2=1 / (E1 / E2) 2 = 1 / (20.4 / 7.15) 2 =1 / 8.14, meaning that the power handling capacity of this coaxial cable waveguide side-fed structure is 8.14 times that of the traditional structure.
[0054] The above calculations are based on the assumption that the dielectric filling is air. The filling dielectric of this invention is a cable insulation layer, namely polytetrafluoroethylene (PTFE), with a breakdown field strength of 22 × 10⁻⁶. 5 V / m is 7.33 times the air breakdown field strength. Therefore, it can be proven that the power enhancement capability of the present invention is at least 8 times that of the conventional solution.
[0055] The side-fed waveguide coaxial converter power capacity of this coaxial cable waveguide side-fed structure is at least 8 times higher than that of traditional high-power solutions, while the product size has not increased. In applications with high power capacity requirements at the user end or in low-pressure environments, its power reliability will be significantly improved.
[0056] In one embodiment, the assembly sequence of this coaxial cable waveguide side-feed structure is as follows:
[0057] Step 1: According to the actual structural diagram, strip the outer sheath and shielding layer of one end of the radio frequency cable 2 to expose the insulation layer and obtain a stripped section of the corresponding length. The remaining part is the unstripped section 23 containing the outer sheath and shielding layer of the cable. Then, strip the insulation layer at the end of the stripped section to expose the cable core wire and obtain the core wire area 21. The remaining part of the stripped section is the insulation layer area 22, thus obtaining the core wire area 21 and insulation layer area 22 as required by the design.
[0058] Step 2: Fix the second nut 13 to the second mounting port 16, and fix the stripped section 23 and the second nut 13 together, that is, ground the outer conductor;
[0059] Step 3: Insert the first nut 12 into place through the first mounting port of the waveguide 11;
[0060] Step 4: Insert the insulation layer area 22 into the first nut 12 through the second nut 13 and the second mounting port 16;
[0061] Step 5: Fix the core wire area 21 to the first nut 12.
[0062] Example 3
[0063] This embodiment provides a coaxial waveguide converter, including a coaxial connector and the waveguide of Embodiment 1. The coaxial connector includes an inner coaxial conductor and an outer coaxial conductor, which are sequentially sleeved from the inside to the outside. The outer coaxial conductor is fitted into a first mounting hole in a first metal support (such as a first nut 12) of the waveguide 1. The outer coaxial conductor is fitted into a second mounting hole (not shown) in a second metal support (such as a second nut 13).
[0064] In one embodiment, the coaxial connector further includes an insulating medium located between the inner coaxial conductor and the outer coaxial conductor. The inner coaxial conductor is embedded in the core wire embedding section of the waveguide 1, and the insulating medium is embedded into the insulating embedding section through the second mounting port 16 of the waveguide 1.
[0065] In one embodiment, the insulating medium is polytetrafluoroethylene or the like.
[0066] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.
Claims
1. A waveguide, characterized in that, The device includes a waveguide with a rectangular waveguide opening. One end of the waveguide opening has a short-circuit block for forming a short path. A first mounting port and a second mounting port are respectively provided on the two wide sides of the waveguide, both communicating with the waveguide opening. A first metal support is embedded in the first mounting port, and the first metal support has a first mounting hole for mounting the core area of a stripped RF cable or the coaxial inner conductor of a coaxial connector. The first mounting hole is coaxially aligned with the second mounting port, and the distance between the first mounting hole and the second mounting port is not less than two-thirds of the narrow side of the waveguide opening. The distance from the central axis of the first mounting hole to the short path is not less than one-quarter of the wavelength. A second metal support is installed in the second mounting port, and the second metal support has a second mounting hole coaxially aligned with the second mounting port. The second mounting hole is used for mounting the unstripped section of the RF cable or the coaxial outer conductor of the coaxial connector.
2. The waveguide according to claim 1, characterized in that, The first mounting hole includes a core wire mounting section and an insulation mounting section. The insulation mounting section is located between the core wire mounting section and the second mounting port. The core wire mounting section is for mounting the core wire area or the inner conductor of the coaxial connector. The insulation mounting section and the second mounting port are both for mounting the insulation layer area or the insulating medium of the coaxial connector.
3. The waveguide according to claim 1 or 2, characterized in that, The first metal support is the first nut.
4. The waveguide according to claim 3, characterized in that, The first nut is threadedly connected to the first mounting port.
5. The waveguide according to claim 1 or 2, characterized in that, The second metal support includes a second nut.
6. The waveguide according to claim 4, characterized in that, The second nut is threaded onto the second mounting port.
7. A coaxial cable waveguide side-fed structure, characterized in that, The device includes a radio frequency cable and a waveguide as described in any one of claims 2-6, wherein the radio frequency cable includes a stripped section and an unstripped section disposed along the axial direction, the stripped section including a core wire region stripped to a core wire, the core wire region being fitted into a first fitting hole, and the unstripped section being fitted into a second fitting hole of the waveguide.
8. The coaxial cable waveguide-side-fed structure according to claim 7, characterized in that, The waveguide as described in claim 2 is used, wherein the stripped section further includes an insulating layer region stripped to an insulating layer, the insulating layer region being located axially between the core wire region and the unstripped section, the core wire region being embedded in the core wire embedding section of the waveguide, and the insulating layer region being embedded in the insulating embedding section by the second mounting port of the waveguide.
9. A coaxial waveguide converter, characterized in that, The device includes a coaxial connector and a waveguide as described in any one of claims 2-6. The coaxial connector includes a coaxial inner conductor and a coaxial outer conductor that are sequentially sleeved from the inside to the outside. The coaxial outer conductor is fitted into a first fitting hole in the waveguide and a second fitting hole in the waveguide.
10. The coaxial waveguide converter according to claim 9, characterized in that, The coaxial connector employs the waveguide as described in claim 2, and further includes an insulating medium located between the inner conductor and the outer conductor of the coaxial connector. The inner conductor is embedded in the core wire mounting section of the waveguide, and the insulating medium is inserted into the insulating mounting section through the second mounting port of the waveguide.