CN112736392A - Waveguide-coaxial line converter - Google Patents
Waveguide-coaxial line converter Download PDFInfo
- Publication number
- CN112736392A CN112736392A CN202011416515.1A CN202011416515A CN112736392A CN 112736392 A CN112736392 A CN 112736392A CN 202011416515 A CN202011416515 A CN 202011416515A CN 112736392 A CN112736392 A CN 112736392A
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- Prior art keywords
- waveguide
- coaxial line
- outer conductor
- matching
- probe
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
- H01P5/103—Hollow-waveguide/coaxial-line transitions
Abstract
The invention discloses a waveguide-coaxial line converter, which comprises a closed shell of a waveguide, wherein the closed shell of the waveguide comprises two waveguide wide edges which are horizontally arranged in parallel and a waveguide short-circuit board which is vertical to the waveguide wide edges, and is characterized in that: the inner wall of the wide edge of the waveguide below the closed shell body comprising the waveguide is connected with a step-type matching block, a probe penetrating through the waveguide short-circuit plate is horizontally arranged on the closed shell body waveguide short-circuit plate comprising the waveguide, one end of the closed shell body probe comprising the waveguide is opposite to the top of the step-type matching block in a hanging mode, and the other end of the closed shell body probe comprising the waveguide is connected with an outer conductor of the radio-frequency coaxial cable connector. The waveguide-coaxial line converter can be used for measuring a microwave radio frequency system and has the characteristics of good transmission characteristic, small insertion loss and convenience in adjustment.
Description
Technical Field
The invention relates to the technical field of waveguide devices, in particular to a waveguide-coaxial line converter.
Background
With the development of the technology, the radio frequency power source and the microwave output power reach 3MW, and a large number of devices such as straight waveguides, bent waveguides, soft waveguides, directional couplers, magic T and the like are needed in the microwave transmission process. The performance of these transmission devices determines the microwave transmission, the loss of measurement and the accuracy, wherein a waveguide-coaxial converter capable of accurately measuring the transmission device is required.
In a high-power microwave transmission system, a transmission device with small insertion loss and small standing wave is required to transmit power, and if the loss of the device is large, the phenomena of increased power reflection, device burnout and the like can be caused. While tools for measuring the performance of waveguide type microwave transmission devices typically use waveguide-to-coaxial converters for measurement. The main mode of waveguide propagation is TE mode, the coaxial line propagation is TEM mode, and the two propagation modes need to be switched. Furthermore, the impedance of a standard waveguide is much larger than 50 ohms, typically several hundred ohms.
Disclosure of Invention
The invention aims to provide a waveguide-coaxial line converter which can be used for measuring a microwave radio frequency system and has the characteristics of good transmission characteristic, small insertion loss and convenience in adjustment. .
The invention can be realized by the following technical scheme:
the invention discloses a waveguide-coaxial line converter, which comprises a closed shell of a waveguide, wherein the shell comprises two waveguide wide edges which are horizontally arranged in parallel and a waveguide short-circuit board which is vertical to the waveguide wide edges, the inner wall of the waveguide wide edges below the shell is connected with a stepped matching block, a probe which penetrates through the waveguide short-circuit board is horizontally arranged on the waveguide short-circuit board, one end part of the probe is opposite to the top of the stepped matching block in a hanging manner, and the other end part of the probe is connected with an outer conductor of a radio-frequency coaxial line connector.
The invention provides a waveguide coaxial converter which is simple to process and has good index performance. The voltage standing wave ratio of a common waveguide-to-coaxial converter is not easy to reach below 1.1, a radial output mode is adopted, and the processing and the fixing are not easy. The invention adopts the longitudinal narrow-edge waveguide output and a step allocation mode to realize the low voltage standing wave ratio design.
At present, on the basis of the conversion from WR1500 waveguide to coaxial and longitudinal direction, compared with the structure form limitation of the conversion from waveguide to coaxial by adopting the output conversion form of radial broadside waveguide, the defects of more complex structure, more parts, large difficulty in assembly and large error, and difficulty in making standing wave smaller exist. The invention can realize the conversion from wave guide such as WR1500 to the coaxial connector by the matching longitudinal conversion structure form of the ladder type matching block, the horizontally arranged probe and the radio frequency coaxial line connector outer conductor, and has good index performance, few parts and simple processing. Meanwhile, the step-type tuning allocation is adopted, the position, size and height of the steps are changed, and frequency adjustment and matching adjustment can be realized.
Furthermore, the outer conductor of the radio-frequency coaxial line connector is fixedly arranged outside the waveguide short-circuit plate through the first matching section outer conductor and the second matching section outer conductor.
Furthermore, the second matching section outer conductor is arranged outside the first matching outer conductor in a surrounding mode, and the radio-frequency coaxial line connector inner conductor is embedded into the first matching section outer conductor and is integrally connected with the probe.
Furthermore, the waveguide short circuit plate is movably matched and connected with the first matching section outer conductor and the second matching section outer conductor through a connecting flange arranged outside the waveguide short circuit plate and a butt flange fixed with the two matching section outer conductors.
Furthermore, the probe is arranged on the waveguide short-circuit plate in a penetrating mode through a first supporting block and a second supporting block which are arranged in an annular mode.
Furthermore, a clamping groove which is movably inserted into one end part of the first supporting block and one end part of the second supporting block are arranged on the waveguide short circuit plate, and the other end parts of the first supporting block and the second supporting block are movably embedded into the connecting flange and the butt flange.
Furthermore, the step-type matching block is of a multi-step structure arranged in the middle of the wide side of the waveguide.
Furthermore, a first U-shaped hole and a second U-shaped hole are formed in the waveguide broadside, and the stepped matching block is embedded into the first U-shaped hole and the second U-shaped hole through screws and fixedly arranged in the middle of the waveguide broadside.
Furthermore, the connecting flange is connected with the waveguide short-circuit plate through a first fixing screw, and the butt-joint flange is connected with the first matching section outer conductor through a second fixing screw.
Furthermore, the first supporting block and the second supporting block are both provided with water/vent holes.
The waveguide-coaxial line converter has the following beneficial effects:
the invention can realize the conversion from wave guide such as WR1500 to the coaxial connector by the matching longitudinal conversion structure form of the ladder type matching block, the horizontally arranged probe and the radio frequency coaxial line connector outer conductor, and has good index performance, few parts and simple processing. Meanwhile, the step-type tuning allocation is adopted, the position, size and height of the steps are changed, and frequency adjustment and matching adjustment can be realized. The stepped matching block is flexible to mount, convenient to tune and allocate, and can ensure the level of the inner conductor structure due to the fact that the polytetrafluoroethylene support is arranged.
Drawings
FIG. 1 is a schematic perspective view of a waveguide-coaxial line converter according to the present invention;
FIG. 2 is a rear view of a waveguide-coaxial line converter of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2 of a waveguide-coaxial line converter in accordance with the present invention;
FIG. 4 is a simulation curve of return loss of a waveguide-coaxial line converter according to the present invention;
FIG. 5 is a simulation curve of voltage standing wave ratio of the waveguide-coaxial line converter according to the present invention;
FIG. 6 is a simulation curve of insertion loss of a waveguide-coaxial line converter according to the present invention;
the reference numbers in the drawings include: 1. a waveguide; 2. a waveguide broadside; 3. a waveguide narrow edge; 4. a waveguide flange; 5. a waveguide short-circuit plate; 6. a connecting flange; 7. butting flanges; 8. a first matching section outer conductor; 9. a second matching section outer conductor; 10. a radio frequency coaxial line connector outer conductor; 11. a step-shaped matching block; 12. a probe; 13. a first support block; 14. a second support block; 15. a first set screw; 16. and a second set screw.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the following detailed description of the present invention is provided with reference to the accompanying drawings.
As shown in fig. 1 to 3, the present invention discloses a waveguide-coaxial line converter, which comprises a closed housing of a waveguide 1, wherein the housing comprises two waveguide wide sides 2 horizontally arranged in parallel, a waveguide short-circuit plate 5 perpendicular to the waveguide wide sides 2, a waveguide flange 4 opposite to the waveguide short-circuit plate 5, and two waveguide narrow sides 3 arranged at the end parts of the two waveguide wide sides 2, the inner wall of the waveguide wide side 2 below the housing is connected with a step-type matching block 11, a probe 12 penetrating through the waveguide short-circuit plate 5 is horizontally arranged on the waveguide short-circuit plate 5, one end part of the probe 12 is opposite to the top part of the step-type matching block 11 in a hanging manner, the other end part of the probe 12 is connected with a radio frequency coaxial line connector outer conductor 10, and the radio frequency coaxial line connector outer conductor 10 outputs a longitudinal narrow side 3 waveguide. .
As shown in fig. 1, the radio frequency coaxial line connector outer conductor 10 is fixedly arranged outside the waveguide short-circuit plate 5 through the first matching section outer conductor 8 and the second matching section outer conductor 9. The second matching section outer conductor 9 is arranged outside the first matching outer conductor in a surrounding mode, and the radio frequency coaxial line connector inner conductor is embedded into the first matching section outer conductor 8 and is integrally connected with the probe 12. The waveguide short-circuit plate 5 is movably matched and connected with a first matching section outer conductor 8 and a second matching section outer conductor 9 through a connecting flange 6 arranged outside the waveguide short-circuit plate 5 and a butt flange 7 fixed with the two matching section outer conductors.
As shown in fig. 3, the probe 12 is inserted into the waveguide short-circuiting plate 5 through a first support block 13 and a second support block 14 which are annularly provided. The waveguide short-circuit plate 5 is provided with a slot which is movably inserted into one end of the first supporting block 13 and one end of the second supporting block 14, and the other end of the first supporting block 13 and the other end of the second supporting block 14 are movably embedded into the connecting flange 6 and the butting flange 7.
As shown in fig. 3, the step-type matching block 11 is a multi-step structure disposed in the middle of the waveguide broadside 2. A first U-shaped hole and a second U-shaped hole are formed in the waveguide broadside 2, and the step-shaped matching block 11 is embedded into the first U-shaped hole and the second U-shaped hole through screws and is fixedly arranged in the middle of the waveguide broadside 2. The U-shaped hole is convenient to adjust and move and detach.
As shown in fig. 1, the connection flange 6 is connected to the waveguide short-circuit board 5 by first fixing screws 15, and the mating flange 7 is connected to the first mating-section outer conductor 8 by second fixing screws 16. The first set screw 15 and the second set screw 16 may employ a conventional M6 screw.
In the invention, the first supporting block 13 and the second supporting block 14 are both provided with water/vent holes for ventilation or for storing water accumulated in the coaxial structure.
In the invention, the shell is made of aluminum alloy plate; the first supporting block and the second supporting block are all polytetrafluoroethylene block bodies; the probe is of a multi-step structure, is made of copper, and is subjected to conductive oxidation treatment on the outer surface; the material of the step-shaped matching block is aluminum alloy, and the upper part of the step-shaped matching block cannot be in contact with the probe.
In order to verify the technical effect of the invention, the simulation calculation is carried out as follows:
standard waveguide impedance calculation formula:
a is the waveguide wide side length and b is the waveguide narrow side length.
λgIs a wavelength of a wave-guide,
for inner partThe diameter of the conductor is R1, the radius of the outer conductor is R2, and the impedance calculation formula of the coaxial line filled with the air medium between the two conductors is as follows:
it can be seen that the waveguide-coaxial conversion needs to be designed for impedance matching, so that the equivalent impedance of the coaxial line of 50 ohms can be smoothly transited to the equivalent impedance of the waveguide of hundreds of ohms.
In addition, because the probe is inserted into the rectangular waveguide and the narrow wall is provided with the hole, reactance is introduced at the coaxial-rectangular waveguide conversion position, wave reflection is caused, and the mismatch of the coaxial line and the waveguide is intensified. It is desirable to introduce a stepped impedance to improve the matching. This enables the converter to achieve impedance matching over a wide frequency range.
Through simulation calculation, the WR1500 waveguide with the waveguide width of 381mm, the waveguide narrow width of 190.5mm and the length of 300mm and the inner conductor have the diameter of 3.04mm and the outer conductor has the radius of 7mm, and the coaxial line with the air medium filled between the two conductors can realize good impedance matching in the bandwidth range of 638.66 MHz-655.74 MHz. The following are data curves of return loss, voltage standing wave ratio and insertion loss calculated by simulation, and meet the requirements, and specific simulation curves are shown in fig. 4-6.
In the description of the present invention, it is to be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate orientations or positional relationships, are used based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and for the simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.
Claims (10)
1. The utility model provides a waveguide-coaxial line converter, includes the close shell of waveguide, the shell includes the waveguide broadside of two horizontal parallel arrangements, with waveguide short-circuiting plate of waveguide broadside looks vertically, its characterized in that: the utility model discloses a radio frequency coaxial line connector, including casing, waveguide short circuit board, stepped matching block, probe, antenna, casing, waveguide broadside inner wall connection of casing below has a stepped matching block, waveguide short circuit board is improved level and is provided with a probe that runs through waveguide short circuit board, an end of probe is unsettled relative with the top of stepped matching block, another tip and the radio frequency coaxial line connector outer conductor of probe are connected.
2. The waveguide-coaxial line converter of claim 1, wherein: the radio frequency coaxial line joint outer conductor is fixedly arranged outside the waveguide short circuit plate through the first matching section outer conductor and the second matching section outer conductor.
3. The waveguide-coaxial line transformer of claim 2, wherein: the second matching section outer conductor is arranged outside the first matching outer conductor in a surrounding mode, and the radio frequency coaxial line connector inner conductor is embedded into the first matching section outer conductor and is integrally connected with the probe.
4. The waveguide-coaxial line converter of claim 3, wherein: the waveguide short circuit plate is movably matched and connected with the first matching section outer conductor and the second matching section outer conductor through a connecting flange arranged outside the waveguide short circuit plate and a butt flange fixed with the two matching section outer conductors.
5. The waveguide-coaxial line converter of claim 4, wherein: the probe is arranged on the waveguide short-circuit plate in a penetrating mode through a first supporting block and a second supporting block which are arranged in a circular mode.
6. The waveguide-coaxial line converter of claim 5, wherein: the waveguide short circuit board is provided with a clamping groove which is movably inserted into one end part of the first supporting block and one end part of the second supporting block, and the other end parts of the first supporting block and the second supporting block are movably embedded into the connecting flange and the butt flange.
7. The waveguide-coaxial line transformer of claim 6, wherein: the step-type matching block is of a multi-step structure arranged in the middle of the wide side of the waveguide.
8. The waveguide-coaxial line converter of claim 7, wherein: the waveguide broadside is provided with a first U-shaped hole and a second U-shaped hole, and the stepped matching block is embedded into the first U-shaped hole and the second U-shaped hole through screws and is fixedly arranged in the middle of the waveguide broadside.
9. The waveguide-coaxial line transformer of claim 8, wherein: the connecting flange is connected with the waveguide short circuit plate through a first fixing screw, and the butt flange is connected with the first matching section outer conductor through a second fixing screw.
10. The waveguide-coaxial line converter of claim 9, wherein: and the first supporting block and the second supporting block are both provided with water/vent holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011416515.1A CN112736392A (en) | 2020-12-07 | 2020-12-07 | Waveguide-coaxial line converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011416515.1A CN112736392A (en) | 2020-12-07 | 2020-12-07 | Waveguide-coaxial line converter |
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| CN112736392A true CN112736392A (en) | 2021-04-30 |
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| CN202011416515.1A Pending CN112736392A (en) | 2020-12-07 | 2020-12-07 | Waveguide-coaxial line converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115411478A (en) * | 2021-05-26 | 2022-11-29 | 散裂中子源科学中心 | Sliding short circuiter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115411478A (en) * | 2021-05-26 | 2022-11-29 | 散裂中子源科学中心 | Sliding short circuiter |
| CN115411478B (en) * | 2021-05-26 | 2023-12-01 | 散裂中子源科学中心 | Sliding short-circuiting device |
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