CN108448218B - Full bandwidth rectangular waveguide coaxial conversion device - Google Patents
Full bandwidth rectangular waveguide coaxial conversion device Download PDFInfo
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- CN108448218B CN108448218B CN201810386228.7A CN201810386228A CN108448218B CN 108448218 B CN108448218 B CN 108448218B CN 201810386228 A CN201810386228 A CN 201810386228A CN 108448218 B CN108448218 B CN 108448218B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 37
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 abstract description 7
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
-
- 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
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- Waveguide Aerials (AREA)
Abstract
The invention discloses a full-bandwidth rectangular waveguide coaxial conversion device, which comprises a rectangular waveguide, wherein the front end of the rectangular waveguide is provided with an opening, the rear end of the rectangular waveguide is provided with a stop wall, the coaxial waveguide coaxial conversion device is also provided with a coaxial connector, a metal inner shaft of the coaxial connector is connected to a metal probe in the rectangular waveguide from the outer side of the bottom of the rectangular waveguide, a non-metal dielectric layer is coated on the outer side of the probe, and the non-metal dielectric layer is made of polytetrafluoroethylene; the cavity of the rectangular waveguide body is also provided with a metal body which is vertically connected with the bottom wall of the inner cavity, and the metal body is positioned at the front side of the probe. The invention greatly reduces the reflection coefficient of the full-wave bandwidth, effectively reduces the insertion loss, improves the conversion efficiency, has stable effect, is easier to process and form due to simple structure, can be widely applied to the rectangular wave guide tube technology in the microwave communication field in a standardized mode in the full-bandwidth spectrum range.
Description
Technical Field
The invention relates to a rectangular waveguide coaxial conversion device in the field of microwave communication.
Background
The waveguide is widely applied to the field of microwave communication and can be divided into a rectangular waveguide, a circular waveguide, a double-ridge waveguide and an elliptic waveguide according to the different cross-sectional shapes of the waveguides. Since the waveguide has the characteristics of good electromagnetic shielding and low loss, the waveguide is often applied to long-distance microwave transmission equipment. Rectangular waveguides are widely used for satellite communications due to their simple structure. In the field of interference and anti-interference communication, rectangular waveguide is often used as an input/output port, and a feeding cable, a vector analyzer, a spectrum analyzer, a power amplifier and the like in actual engineering are also coaxial lines used as input/output ports. Rectangular waveguide coaxial converters are used in large numbers in waveguide devices as a conversion device of coaxial lines (TEM modes) to rectangular waveguides (TE modes).
Since waveguide communication is often used in the field of high frequency and ultra high frequency, the cavity size is usually only millimeter, so that a rectangular waveguide coaxial converter with simple design and easy manufacture is widely required. However, the rectangular waveguide coaxial converter has an excessively large insertion loss due to a high reflection coefficient, and it is difficult for the rectangular waveguide coaxial converter to achieve a low reflection coefficient within a full-wave bandwidth. If a complex internal structure is added to reduce the reflection coefficient, the difficulty of manufacturing is increased.
Currently, rectangular waveguide coaxial switching devices can be classified into coaxial probe waveguide switches, double-ridge rectangular waveguide switches, microstrip line waveguide switches, and the like according to the difference of the internal structures of the waveguide cavities thereof. The coaxial probe waveguide converter and the double-ridge rectangular waveguide converter have the characteristic of high total bandwidth internal reflection coefficient, and the microstrip line waveguide converter has the characteristic of narrow frequency bandwidth and incapability of realizing total bandwidth low reflection coefficient.
In the prior art, in order to reduce the reflection coefficient and expand the frequency bandwidth, the adopted technical means mainly comprise: the top of the coaxial line probe is thickened or is added with discs, a plurality of resonance screws are added in the cavity, and the cavity is filled with media or is added with a coaxial line media jacket, a stepped wall structure and the like. However, the design is complicated, the manufacturing is difficult, the frequency bandwidth expansion range is too narrow, and the method is only suitable for a standard waveguide (the aspect ratio of the waveguide opening is 2:1), and cannot be widely applied.
Disclosure of Invention
The invention provides a full-bandwidth rectangular waveguide coaxial conversion device, which aims to: the reflection coefficient is reduced, better reflection coefficient characteristic is obtained at the full bandwidth of the waveguide, loss is reduced, the conversion efficiency is improved, and the structure is easier to manufacture and form.
The technical scheme of the invention is as follows:
the full-bandwidth rectangular waveguide coaxial conversion device comprises a rectangular waveguide, wherein the front end of the rectangular waveguide is provided with an opening, the rear end of the rectangular waveguide is provided with a cut-off wall, a coaxial connector is further arranged, a metal inner shaft of the coaxial connector is connected to a metal probe in the rectangular waveguide from the outer side of the bottom of the rectangular waveguide, and a non-metal dielectric layer is coated on the outer side of the probe;
the cavity of the rectangular waveguide body is also provided with a metal body which is vertically connected with the bottom wall of the inner cavity, and the metal body is positioned at the front side of the probe.
As a further improvement of the device: the center of the metal body is offset in the right-left direction with respect to the probe.
As a further improvement of the device: the nonmetallic medium layer is uniformly coated on the periphery of the probe.
As a further improvement of the device: the nonmetallic medium layer material coated on the periphery of the probe is polytetrafluoroethylene.
As a further improvement of the device: the metal body is cuboid.
As a further improvement of the device: the metal body is a cuboid, the distance between the center of the cuboid and the probe in the front-rear direction is 0.1-0.14 wavelength, the distance between the center of the cuboid and the probe in the left-right direction is 0.06-0.14 wavelength, the length of the cuboid in the left-right direction is 0.125-0.26 wavelength, the thickness of the cuboid in the front-rear direction is 0.038-0.085 wavelength, and the height of the cuboid in the front-rear direction is 0.042-0.067 wavelength.
As a further improvement of the device: the width of the inner section of the rectangular waveguide is 149.9/fc, fc is the cut-off frequency of the rectangular waveguide, the height of the inner section of the rectangular waveguide is less than or equal to 0.7 times of the width of the inner section of the rectangular waveguide, and the inner section refers to the section of the inner cavity of the rectangular waveguide in a plane perpendicular to the front-back direction.
As a further improvement of the device: the probe is located at 1/4 wavelength in front of the cut-off wall.
Compared with the prior art, the invention has the following positive effects: on the basis of adding a nonmetallic medium layer, a metal block is added at the bottom of the inner wall of the waveguide, the reflection coefficient of the rectangular waveguide coaxial conversion device in the full bandwidth is greatly reduced, the impedance is effectively matched, the conversion efficiency is improved, the effect is stable, and the probe and the nonmetallic medium layer structure are connected with a standard 50 ohm coaxial connector, so that the probe uniformly coats the medium layer, the actually measured bandwidth is wider, the structure is simple, the processing and the forming are easier, and the rectangular waveguide coaxial conversion device can be widely applied to rectangular waveguide technologies in the microwave communication field in a standardized mode in the full bandwidth frequency range.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic top view of fig. 1.
FIG. 3 is a graph comparing simulation results in the examples.
FIG. 4 is a graph comparing simulation results with test results after finished product processing in the example.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings:
as shown in fig. 1 and 2, a full-bandwidth rectangular waveguide coaxial switching device can be applied to a rectangular waveguide 1, wherein the front end of the rectangular waveguide 1 is provided with an opening 7, and the rear end is provided with a blocking wall 6, so that electromagnetic waves can only propagate towards the opening 7.
The technology can be applied to the rectangular waveguide 1 with the section width of 149.9/fc (fc is the cut-off frequency of the rectangular waveguide), the height of the inner section of the rectangular waveguide 1 is less than or equal to 0.7 times the width of the inner section of the rectangular waveguide 1, and the inner section refers to the section of the inner cavity of the rectangular waveguide 1 in a plane perpendicular to the front-rear direction. Preferably, the rectangular waveguide 1 is a standard waveguide with an inner section height which is 0.5 times the inner section width of the rectangular waveguide 1.
The device is also provided with a coaxial connector 3, and the metal inner shaft of the coaxial connector 3 is connected with the metal probe 2 in the rectangular wave conductor 1 from the outer side of the bottom of the rectangular wave conductor 1. The probe 2 is located at about 1/4 wavelength in front of the cut-off wall 6. The metal probe 2 can be regarded as a small monopole antenna, and the size of the metal probe is designed according to the height of the rectangular waveguide section so as to excite the electromagnetic wave of TE mode.
The outer side of the probe 2 is coated with a nonmetallic medium layer 4; preferably, the nonmetallic medium layer 4 is uniformly coated on the periphery of the probe 2, and is made of polytetrafluoroethylene, so that the equivalent impedance of the rectangular waveguide is reduced, and the reflection coefficient of the rectangular waveguide coaxial converter is reduced.
The cavity of the rectangular waveguide body 1 is also provided with a metal body 5 which is vertically connected with the bottom wall of the inner cavity, and the metal body 5 is positioned at the front side of the probe 2. Preferably, the center of the metal body 5 is offset in the left-right direction with respect to the probe 2. When the rectangular waveguide is applied, the impedance of the rectangular waveguide can be further matched by micro-adjusting the size of the metal body 5 and the distance from the probe 2.
The metal body 5 is a cuboid.
When applied to standard waveguides, the metal body 5 is set in the following dimensions: the distance between the center of the rectangular parallelepiped and the probe 2 in the front-rear direction is preferably 0.138 wavelength, the distance between the center of the rectangular parallelepiped and the probe 2 in the left-right direction is preferably 0.117 wavelength, the length of the rectangular parallelepiped in the left-right direction is preferably 0.24 wavelength, the thickness in the front-rear direction is preferably 0.0625 wavelength, and the height is preferably 0.062 wavelength.
The technical effects of the present invention are verified by comparative experiments. The software used for simulation was a CST Microwave studio. Taking WR-75 standard waveguide as an example, the following schemes are used to test the return loss of the conversion device at different frequencies:
A. only the traditional metal probe 2 is used, and a nonmetal medium and a metal block are not arranged;
B. using a standard 50 European coaxial connector metal probe 2, wherein the metal probe 2 is coated with a nonmetal medium layer 4, and no metal block is arranged;
C. by adopting the preferable technical scheme of the invention, the nonmetallic dielectric layers 4 are coated outside the metal probes 2, and meanwhile, the metal blocks are arranged.
The three resulting curves are shown in fig. 3, where the ordinate represents return loss and the abscissa represents frequency.
As can be seen from fig. 3, in the case where the coaxial line is connected only to the metal probe 2, the full bandwidth (10 GHz-15 GHz) return loss is-14.5 dB. When the nonmetallic dielectric layer 4 is coated outside the metallic probe 2, the return loss can be reduced to-18 dB; when the metal block is added, the return loss can reach-21.5 dB, and the calculation shows that the reflection coefficient is lower than 10%.
The comparison of the simulation result and the finished product post-processing test result is shown in fig. 4, wherein the solid line is the simulation result, and the dotted line is the finished product post-processing test result. Many inventive solutions tend to have worse actual machining test results than simulation results due to machining difficulty and accuracy. In the embodiment of the technical scheme, simulation results show that the return loss is lower than-20 dB within the frequency bandwidth range of 9.75 GHz-15.2 GHz, and test results show that the return loss is lower than-20 dB within the frequency bandwidth range of 8.78 GHz-15.75 GHz. The actual measured frequency bandwidth is increased by 1.5GHz from the simulation result.
Therefore, after the two measures are taken, the reflection coefficient of the rectangular waveguide coaxial conversion device at the total bandwidth can be reduced to an excellent level, the loss of the rectangular waveguide coaxial converter is reduced, the conversion efficiency is improved, and the rectangular waveguide coaxial conversion device is simple in structure and easy to process and form. It is further understood that similar technical effects can be obtained when the structure according to the present invention is applied to waveguides of other dimensions.
Claims (3)
1. The utility model provides a coaxial conversion equipment of full bandwidth rectangular waveguide, includes rectangular waveguide body (1), rectangular waveguide body (1) front end has opening (7), and the back is stop wall (6), its characterized in that: the coaxial connector is further provided with a coaxial connector (3), a metal inner shaft of the coaxial connector (3) is connected to a metal probe (2) in the rectangular waveguide body (1) from the outer side of the bottom of the rectangular waveguide body (1), and a nonmetallic medium layer (4) is coated on the outer side of the probe (2);
a metal body (5) vertically connected with the bottom wall of the inner cavity is further arranged in the cavity of the rectangular waveguide body (1), and the metal body (5) is positioned at the front side of the probe (2);
the center of the metal body (5) is offset relative to the probe (2) in the left-right direction;
the metal body (5) is a cuboid, the distance between the center of the cuboid and the probe (2) in the front-rear direction is 0.1-0.14 wavelength, the distance between the center of the cuboid and the probe (2) in the left-right direction is 0.06-0.14 wavelength, the length of the cuboid in the left-right direction is 0.125-0.26 wavelength, the thickness of the cuboid in the front-rear direction is 0.038-0.085 wavelength, and the height of the cuboid in the front-rear direction is 0.042-0.067 wavelength;
the width of the inner section of the rectangular waveguide body (1) is 149.9/fc, fc is the cut-off frequency of the rectangular waveguide, the height of the inner section of the rectangular waveguide body (1) is less than or equal to 0.7 times of the width of the inner section of the rectangular waveguide body (1), and the inner section refers to the section of the inner cavity of the rectangular waveguide body (1) in a plane perpendicular to the front-rear direction;
the probe (2) is positioned at 1/4 wavelength in front of the cut-off wall (6).
2. The full bandwidth rectangular waveguide coaxial switching device according to claim 1, wherein: the nonmetallic medium layer (4) is uniformly coated on the periphery of the probe (2).
3. The full bandwidth rectangular waveguide coaxial switching device according to claim 1, wherein: the nonmetallic medium layer (4) coated on the periphery of the probe (2) is made of polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810386228.7A CN108448218B (en) | 2018-04-26 | 2018-04-26 | Full bandwidth rectangular waveguide coaxial conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810386228.7A CN108448218B (en) | 2018-04-26 | 2018-04-26 | Full bandwidth rectangular waveguide coaxial conversion device |
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| Publication Number | Publication Date |
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| CN108448218A CN108448218A (en) | 2018-08-24 |
| CN108448218B true CN108448218B (en) | 2024-01-26 |
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| CN201810386228.7A Active CN108448218B (en) | 2018-04-26 | 2018-04-26 | Full bandwidth rectangular waveguide coaxial conversion device |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200193A (en) * | 2018-11-20 | 2020-05-26 | 成都海澳科技有限公司 | Collinear antenna array composed of novel monopole antennas and composite antenna array |
| CN111200194A (en) * | 2018-11-20 | 2020-05-26 | 成都海澳科技有限公司 | Area antenna array composed of novel monopole antenna |
| CN111200192A (en) * | 2018-11-20 | 2020-05-26 | 成都海澳科技有限公司 | Orthogonal antenna array and composite antenna array formed by novel monopole antennas |
| CN110739515B (en) * | 2019-10-12 | 2021-09-17 | 南京理工大学 | Converter for transition from Ku waveband coaxial waveguide to rectangular waveguide |
| TWI737109B (en) | 2019-12-31 | 2021-08-21 | 財團法人工業技術研究院 | Circuit structure |
| CN112886169B (en) * | 2021-03-29 | 2021-10-26 | 电子科技大学 | Rectangular waveguide-to-coaxial converter |
| CN114464976B (en) * | 2022-03-10 | 2023-05-02 | 航天恒星科技有限公司 | Ku frequency band microstrip waveguide conversion device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006279473A (en) * | 2005-03-29 | 2006-10-12 | Kyocera Corp | High-frequency line/waveguide converter |
| CN205621837U (en) * | 2015-12-31 | 2016-10-05 | 昆山市双桥铜业有限公司 | Coaxial converter of waveguide |
| RU2652101C1 (en) * | 2017-03-20 | 2018-04-25 | Федеральное казенное предприятие "Научно-производственный центр "Дельта" (ФКП "НПЦ "Дельта") | Device for electromagnetic shielding of contact connection of housings of radioelectronic equipment |
| CN208336465U (en) * | 2018-04-26 | 2019-01-04 | 李澍 | The coaxial conversion equipment of full bandwidth rectangular waveguide |
-
2018
- 2018-04-26 CN CN201810386228.7A patent/CN108448218B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006279473A (en) * | 2005-03-29 | 2006-10-12 | Kyocera Corp | High-frequency line/waveguide converter |
| CN205621837U (en) * | 2015-12-31 | 2016-10-05 | 昆山市双桥铜业有限公司 | Coaxial converter of waveguide |
| RU2652101C1 (en) * | 2017-03-20 | 2018-04-25 | Федеральное казенное предприятие "Научно-производственный центр "Дельта" (ФКП "НПЦ "Дельта") | Device for electromagnetic shielding of contact connection of housings of radioelectronic equipment |
| CN208336465U (en) * | 2018-04-26 | 2019-01-04 | 李澍 | The coaxial conversion equipment of full bandwidth rectangular waveguide |
Non-Patent Citations (1)
| Title |
|---|
| 宇航用毫米波高功率波导同轴转换器设计;曲冬梅;韩晓川;;磁性材料及器件(05);全文 * |
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