A waveguide coaxial converter
The waveguide-coaxial converter with orthogonal probe layout and matching block design solves the problems of bandwidth limitation and high-frequency signal leakage in the millimeter-wave band of traditional waveguide-coaxial converters, achieving low loss and optimized VSWR, and improving impedance matching efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI SHENGLANDE IND CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional waveguide-coaxial converters suffer from limited bandwidth, high return loss, complex structure, and easy leakage of high-frequency signals in the millimeter-wave band. In particular, miniaturization of the 1.85-K coaxial interface and matching of waveguide size are very difficult.
An orthogonal probe layout and matching block design are adopted. The probes are inserted vertically into the coaxial connector. Combined with the optimized structure of the rectangular waveguide and waveguide cavity, electromagnetic coupling is formed, impedance matching is adjusted, and high-order mode excitation and signal leakage are reduced.
It achieves low insertion loss and optimized VSWR in the 45–53 GHz frequency range, improves impedance matching efficiency, and reduces high-frequency signal leakage.
Smart Images
Figure CN224458548U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of communication technology, specifically relating to a waveguide-coaxial converter. Background Technology
[0002] Traditional waveguide-coaxial converters suffer from problems such as limited bandwidth, high return loss, and complex structure in the millimeter-wave band; conventional probe-type designs are prone to impedance mismatch due to dimensional tolerances when operating at high frequencies, and it is difficult to optimize the VSWR in the broadband; while miniaturization of the 1.85-K coaxial interface and matching the waveguide size are difficult, and the problem of easy leakage of high-frequency signals needs to be solved. Utility Model Content
[0003] To address the problems of difficulty in optimizing broadband VSWR and easy leakage of high-frequency signals in existing technologies, this utility model proposes a waveguide-coaxial converter, including a mounting flange, a converter base plate, a waveguide cavity, a rectangular waveguide, a coaxial connector, and a probe; one end of the waveguide cavity is mounted on the converter base plate, and the other end is provided with a mounting flange; a coaxial connector is provided on the mounting flange, and a probe is installed inside the coaxial connector, with the probe vertically inserted into the coaxial connector; a rectangular waveguide is mounted on the converter base plate.
[0004] Preferably, the probe insertion depth is 1.5 mm.
[0005] Preferably, the mounting flange is fixed to the waveguide cavity by mounting bolts.
[0006] Preferably, the coaxial connector has a threaded section.
[0007] Preferably, the converter base plate has positioning holes around its perimeter.
[0008] Preferably, a matching block perpendicular to the probe is provided inside the waveguide cavity.
[0009] Ideally, the thickness of the matching block is 0.4 mm.
[0010] Preferably, the operating frequency range of the rectangular waveguide is 45–53 GHz.
[0011] Preferably, the rectangular waveguide has a length of 5.69 mm and a width of 2.85 mm.
[0012] Preferably, the converter base plate has a length of 21.1 mm, a width of 21.1 mm, and a height of 25 mm.
[0013] Compared with the prior art, the technical solution of this utility model has the following advantages / benefits:
[0014] 1. By using an orthogonal probe layout, the probes are inserted vertically from the center of the coaxial connector to form an orthogonal electromagnetic coupling structure, which reduces high-order mode excitation and reduces high-frequency signal leakage.
[0015] 2. The probe tip is inserted to a depth of approximately 1.5 mm, and a matching block is placed perpendicular to the probe to adjust impedance matching, thereby improving the efficiency of impedance matching. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 This is a front view of a waveguide-coaxial converter according to this utility model.
[0018] Figure 2 This is a top view of a waveguide-coaxial converter according to this utility model.
[0019] Figure 3 This is a side view of a waveguide-coaxial converter according to this utility model.
[0020] Figure 4 This is a simulation diagram of the standing wave ratio of this utility model.
[0021] Figure 5 This is a simulation diagram of the insertion loss of this utility model.
[0022] The markings in the diagram are as follows: 1. Mounting flange; 2. Mounting bolt; 3. Converter base plate; 4. Waveguide cavity; 5. Threaded section; 6. Rectangular waveguide; 7. Positioning hole; 8. Coaxial connector; 9. Probe. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the detailed description of the embodiments of this utility model provided below is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model.
[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
[0025] Example:
[0026] like Figure 1 , Figure 2 , Figure 3 As shown, this utility model proposes a waveguide-coaxial converter, including a mounting flange 1, mounting bolts 2, a converter base plate 3, a waveguide cavity 4, a threaded section 5, a rectangular waveguide 6, positioning holes 7, a coaxial connector 8, and a probe 9; one end of the waveguide cavity 4 is mounted on the converter base plate 3, and the other end is provided with a mounting flange 1 fixed by mounting bolts 2; a coaxial connector 8 with a threaded section 5 is provided on the mounting flange 1, and a probe 9 is installed in the coaxial connector 8; the rectangular waveguide 6 is mounted on the converter base plate 3, and mounting positioning holes 7 are provided around it.
[0027] In existing waveguide-coaxial converters, welding is generally used for fixing, which requires high debugging standards, is difficult to operate, has low production efficiency, and poor consistency.
[0028] This invention employs an orthogonal probe coupling method to achieve mode conversion between the TE10 mode and the coaxial TEM mode in the waveguide cavity, thus solving the above problems.
[0029] In actual use, the waveguide coaxial converter can be fixed in a suitable position by bolts through the positioning holes 7. After use, it can be quickly disassembled for the next use, which improves the efficiency of operation. The converter base plate 3 is provided with four positioning holes 7, and the positioning holes 7 are distributed in a rectangular state on the converter base plate 3. The distance between each positioning hole 7 is 14.7mm.
[0030] The mounting flange 1 is provided with four mounting bolts 2, and the mounting flange 1 is fixed to the waveguide cavity 3 by the mounting bolts 2.
[0031] The probe 9 is made of beryllium copper alloy. The probe 9 is inserted vertically from the center of the wide side of the rectangular waveguide 6 to a depth of 1.5mm, forming an orthogonal electromagnetic coupling structure, which can significantly reduce the excitation of higher-order modes.
[0032] In this embodiment, the insertion depth of probe 9 is approximately 1.2-1.5 mm, which balances bandwidth and return loss. A matching block with a thickness of 0.4 mm is placed perpendicular to the probe and at the connection tuning short-circuit plane to adjust impedance matching. Figure 5 As shown, the insertion loss of this waveguide coaxial converter is less than or equal to 0.5dB.
[0033] The converter base plate 3 has a length of 21.1mm, a width of 21.1mm, and a height of 25mm.
[0034] The rectangular waveguide 6 operates in the TE10 master mode, with a working frequency range of 45–53 GHz.
[0035] The rectangular waveguide 6 has a length of 5.69 mm and a width of 2.85 mm.
[0036] Furthermore, this waveguide-coaxial converter incorporates an orthogonal coaxial line with a characteristic impedance of 50Ω. The distance from the center of the orthogonal coaxial line to the rectangular waveguide 6 is the short-circuit distance. The optimal short-circuit distance can be determined through electromagnetic simulation optimization, which can significantly reduce high-frequency signal leakage. The optimal operating frequency range of this waveguide-coaxial converter is 45–53 GHz.
[0037] The waveguide cavity 4 is made of gold-plated copper with a surface roughness ≤1.6. A matching block with a height of 0.4mm is installed inside the waveguide cavity 4. By adjusting the probe 9 and the matching block, a voltage standing wave ratio (VSWR) ≤1.3 is achieved within the 45–53 GHz range. Simulation data is as follows: Figure 4 As shown.
[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0040] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.
Claims
1. A waveguide-coaxial converter, characterized in that, The device includes a mounting flange, a converter base plate, a waveguide cavity, a rectangular waveguide, a coaxial connector, and a probe. One end of the waveguide cavity is mounted on the converter base plate, and the other end is provided with a mounting flange. A coaxial connector is provided on the mounting flange, and a probe is installed inside the coaxial connector, with the probe inserted vertically into the coaxial connector. A rectangular waveguide is mounted on the converter base plate.
2. A waveguide coaxial converter according to claim 1, characterized in that The probe is inserted to a depth of 1.5 mm.
3. A waveguide coaxial converter according to claim 1, wherein, The mounting flange is fixed to the waveguide cavity by mounting bolts.
4. A waveguide coaxial converter according to claim 1, wherein, The coaxial connector is provided with a threaded section.
5. A waveguide coaxial converter according to claim 1, wherein, The converter base plate has positioning holes around its perimeter.
6. A waveguide-coaxial converter according to claim 1, characterized in that, The waveguide cavity is equipped with a matching block perpendicular to the probe.
7. A waveguide coaxial converter according to claim 6, wherein, The thickness of the matching block is 0.4 mm.
8. A waveguide coaxial converter according to claim 1, wherein, The operating frequency range of the rectangular waveguide is 45–53 GHz.
9. A waveguide coaxial converter according to claim 1, wherein, The rectangular waveguide has a length of 5.69 mm and a width of 2.85 mm.
10. A waveguide coaxial converter according to claim 1, wherein, The converter base plate has a length of 21.1 mm, a width of 21.1 mm, and a height of 25 mm.