CN112072250A - Terahertz waveguide-coaxial conversion structure based on waveguide narrow-wall crank arm coaxial probe - Google Patents
Terahertz waveguide-coaxial conversion structure based on waveguide narrow-wall crank arm coaxial probe Download PDFInfo
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- CN112072250A CN112072250A CN202010874226.XA CN202010874226A CN112072250A CN 112072250 A CN112072250 A CN 112072250A CN 202010874226 A CN202010874226 A CN 202010874226A CN 112072250 A CN112072250 A CN 112072250A
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- 239000000523 sample Substances 0.000 title claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 34
- 239000004020 conductor Substances 0.000 claims abstract description 15
- 238000010168 coupling process Methods 0.000 abstract description 18
- 230000008878 coupling Effects 0.000 abstract description 17
- 238000005859 coupling reaction Methods 0.000 abstract description 17
- 230000005684 electric field Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005459 micromachining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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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 lines or devices with unbalanced lines or devices
- H01P5/103—Hollow-waveguide/coaxial-line transitions
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Abstract
The invention discloses a terahertz waveguide-coaxial conversion structure based on a waveguide narrow-wall crank arm coaxial probe, which comprises a waveguide metal shell, wherein the waveguide metal shell is a cuboid, a rectangular waveguide opening is formed in the front end of the waveguide metal shell, a short-circuit back plate is arranged at the rear end of the waveguide metal shell, and a waveguide cavity is formed in the waveguide metal shell. The right side wall of the waveguide metal shell is provided with a coaxial cable connector, the coaxial cable connector comprises a crank arm probe, an insulating medium layer is wrapped outside the crank arm probe, and an outer conductor layer is wrapped outside the insulating medium layer. The left end of the crank arm probe extends into the waveguide cavity, is bent and then is connected to the top wall of the waveguide cavity. The invention realizes the purpose of completing waveguide-coaxial conversion by waveguide narrow edge coupling, and breaks through the limitation that the traditional probe coupling can only feed in from a waveguide long arm; a crank arm probe structure is designed, a novel resonant cavity is generated by utilizing the short connection of the multi-stage crank arm probe and the inner wall of the waveguide cavity, and the conversion from the waveguide field to the coaxial field is completed by utilizing the electric field distribution characteristic during resonance.
Description
Technical Field
The invention relates to the field of terahertz waveguide-coaxial conversion structures, in particular to a terahertz waveguide-coaxial conversion structure based on a waveguide narrow-wall crank arm coaxial probe.
Background
Different from a microwave frequency band, a terahertz frequency band lacks a high-power source, and various transmission lines and antennas are difficult to apply to the terahertz frequency band due to large loss, so that the antenna type still mainly adopts a horn antenna, the transmission lines mainly adopt waveguides, and how to realize efficient interconnection of a waveguide feed antenna and a terahertz circuit is one of key technologies of terahertz system design.
The terahertz waveguide-coaxial converter is a key device for connecting a waveguide feed horn antenna with a terahertz circuit at the transmitting and receiving front ends, and the energy conversion efficiency and the working bandwidth of the terahertz waveguide-coaxial converter directly influence the working performance of the whole system. Due to the short wavelength of the terahertz frequency band, the size of a circuit device is small, a complex waveguide-coaxial conversion structure is not easy to implement, and due to the large attenuation of the coaxial line, the length of the coaxial line is not easy to increase at will to meet the requirement of structural interconnection. Therefore, the terahertz waveguide-coaxial converter is required to have the characteristics of simple structure, easiness in processing and installation, low loss and wide bandwidth.
The traditional waveguide-coaxial converter realizes the energy conversion of the waveguide and the coaxial line by adopting a suspension probe coupling mode, and completes the electric field coupling through a coaxial inner needle extending into a waveguide cavity based on a waveguide long arm, wherein the probe is positioned at the strongest part of an electric field, and the direction of the needle head is kept consistent with the direction of the electric field. When the same method is adopted for coupling from the narrow wall of the waveguide, the energy conversion of the waveguide and the coaxial line can be completely failed according to the orthogonality of field coupling, and the method is fully verified. Due to the limitation of long-side coupling, when the array antenna and the front-end circuit are required to be coaxially interconnected, the structure of the waveguide coaxial converter limits the structural design of the whole system. Taking the waveguide feed pyramid horn antenna as an example, the array pitch of the multi-antenna is not adjustable in relation to the wavelength, the distance between the waveguide port and the waveguide port is very tight in the terahertz frequency band, and it is basically not feasible to install the waveguide-coaxial converter in a narrow space. If coupling can only be achieved from the waveguide long arm, the freedom of array antenna arrangement will be greatly limited, making the structural design extremely difficult and complicated.
For a one-dimensional array antenna, because the array element spacing is related to the wavelength, the coaxial cable connector cannot be installed in a tiny space between the array elements in the terahertz frequency band. Therefore, when the long sides of the waveguide ports are arranged in parallel, the twisted waveguides are required to be turned to the vertical direction, and the structural complexity is increased to facilitate the installation of the coaxial cable connectors.
The one-dimensional pyramidal horn antenna array and the waveguide coaxial conversion structure are shown in fig. 1. The horn antenna adopts rectangular waveguide feed, and the conversion structure of the waveguide and the coaxial line comprises a section of twisted waveguide, a reflection cavity and a coaxial cable joint. The twisted waveguide turns the waveguide long arm from the vertical direction to the horizontal direction, so that enough design space is reserved for conveniently installing the coaxial cable connector. The coaxial cable joint outer conductor is connected with the outer wall of the reflection cavity through the flange plate, the inner conductor extends into the reflection cavity for a section of length, and the waveguide and coaxial energy conversion is realized in a probe coupling mode. The conversion structure is based on waveguide long-arm probe coupling, and changes the arrangement direction of waveguide ports by using twisted waveguides, so that the problem of space limitation during the installation of a coaxial cable connector is solved. However, the processing of the twisted waveguide is a difficult problem for the terahertz frequency band, and the processing capability and the processing precision of the existing micromachining process for the complex structure are very limited, so that the method has a long distance from the practical production application.
Therefore, a feeding method based on waveguide narrow-wall coupling needs to be found, the interconnection between the waveguide and the coaxial is realized, and multiple limitations of waveguide long-arm coupling on array arrangement, system structure, processing technology and the like are broken through.
Disclosure of Invention
Aiming at the problems of the existing terahertz waveguide-coaxial converter, the invention provides a terahertz waveguide-coaxial conversion structure based on a waveguide narrow-wall crank arm coaxial probe, solves the problem that the traditional probe coupling method can only realize coupling from a waveguide long arm, has the characteristics of simple structure and wide bandwidth, and can effectively reduce the complexity of a system structure and reduce the system noise.
The invention adopts the following technical scheme:
the terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe comprises a waveguide metal shell, wherein the waveguide metal shell is a cuboid, a rectangular waveguide port is formed in the front end of the waveguide metal shell, a short-circuit back plate is arranged at the rear end of the waveguide metal shell, and a waveguide cavity is formed in the waveguide metal shell;
a coaxial cable connector is arranged on the right side wall of the waveguide metal shell and comprises a crank arm probe, an insulating medium layer is wrapped outside the crank arm probe, an outer conductor layer is wrapped outside the insulating medium layer, and the end part of the outer conductor layer is fixedly connected to the right side wall of the waveguide metal shell;
the right end of the crank arm probe is flush with the right end faces of the insulating medium layer and the outer conductor layer, and the left end of the crank arm probe extends into the waveguide cavity and is connected to the top wall of the waveguide cavity after being bent.
Preferably, the coaxial cable connector is arranged on the rear side of the right side wall of the waveguide metal shell, and the coaxial cable connector is close to the short circuit backboard.
Preferably, a through hole with the same diameter as that of the insulating medium layer is formed at the joint of the coaxial cable connector and the right side wall of the waveguide metal shell, and the crank arm probe penetrates through the through hole and extends into the waveguide cavity.
Preferably, the left end of the crank arm probe is bent upwards into a step shape in the waveguide cavity and is electrically connected to the top wall of the waveguide cavity, and the joint of the crank arm probe and the top wall of the waveguide cavity is a short-circuit point.
Preferably, the insulating medium layer and the outer conductor layer are both cylindrical.
Preferably, the crank arm probe is spaced from the shorting backplane by a distance of one quarter of the spatial wavelength corresponding to the design center frequency.
The invention has the beneficial effects that:
the terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe provided by the invention realizes the purpose of completing waveguide-coaxial conversion by waveguide narrow-edge coupling, and breaks through the limitation that the traditional probe coupling can only feed in from a waveguide long arm; a crank arm probe structure is designed, a novel resonant cavity is generated by short-circuiting a multi-stage crank arm probe and the inner wall of a waveguide cavity, and the conversion from a waveguide field to a coaxial field is completed by utilizing the distribution characteristic of an electric field during resonance; compared with the prior art, the invention does not need a complex twisted waveguide structure, and solves the problem of difficult processing of special waveguides caused by the limitation of process capability; the invention can directly connect the waveguide and the coaxial, does not need a multi-stage conversion structure, reduces the whole size and avoids the system noise problem caused by multi-stage conversion. The invention only needs to accurately control the crank arm probe, and other parts can be solved by adopting the traditional process, so that the invention has the advantages of low cost, simple structure and easy realization, is suitable for the front end of a multi-channel terahertz transceiving system and is used for connecting a waveguide transmission line and a coaxial line.
Drawings
Fig. 1 is a schematic structural diagram of a conventional waveguide-coaxial converter based on waveguide long-side coupling.
Fig. 2 is a schematic diagram of a terahertz waveguide-coaxial conversion structure based on a waveguide narrow-wall crank arm coaxial probe.
Fig. 3 is a longitudinal sectional view of a terahertz waveguide-coaxial conversion structure based on a waveguide narrow-wall crank arm coaxial probe.
Fig. 4 is a transverse cross-sectional view of a terahertz waveguide-coaxial conversion structure based on a waveguide narrow-wall crank arm coaxial probe.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
with reference to fig. 2 to 4, the terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe includes a waveguide metal housing 1, the waveguide metal housing is a cuboid, a rectangular waveguide port 2 is formed at the front end of the waveguide metal housing, a short-circuit back plate 3 is arranged at the rear end of the waveguide metal housing, and a waveguide cavity 4 is formed in the waveguide metal housing.
The front port of the waveguide cavity is a rectangular waveguide port 2 which can be connected with a waveguide transmission line.
The right side wall of the waveguide metal shell is provided with a coaxial cable connector which is a 50 omega standard coaxial connector.
The coaxial cable connector comprises a crank arm probe 5, an insulating medium layer 6 is wrapped outside the crank arm probe, an outer conductor layer 7 is wrapped outside the insulating medium layer, the end part of the outer conductor layer is fixedly connected to the right side wall of the waveguide metal shell, namely the whole coaxial cable connector is arranged on the narrow wall of the waveguide metal shell.
The insulating medium layer and the outer conductor layer are both cylindrical.
The right end of the crank arm probe 5 is flush with the right end faces of the insulating medium layer and the outer conductor layer, and the left end of the crank arm probe extends into the waveguide cavity, is bent and then is connected to the top wall of the waveguide cavity 4.
The coaxial cable connector is arranged on the rear side of the right side wall of the waveguide metal shell, and the coaxial cable connector is close to the short circuit backboard.
The joint of the coaxial cable joint and the right side wall of the waveguide metal shell is provided with a through hole 8 with the same diameter as that of the insulating medium layer, and the crank arm probe penetrates through the through hole and extends into the waveguide cavity.
The left end of the crank arm probe is bent up in the waveguide cavity to form a step 9 and is electrically connected to the top wall of the waveguide cavity, as shown in fig. 3, and the junction of the crank arm probe and the top wall of the waveguide cavity is a short-circuit point 10.
Specifically, the distance between the crank arm probe and the short-circuit back plate is one quarter of the space wavelength corresponding to the design center frequency.
The invention utilizes the electric field distribution characteristics of a waveguide field TE10 mode and a coaxial TEM mode and utilizes a crank arm probe structure and a short-circuit mode to excite a new resonant cavity. The short-circuit coupling probe divides the rectangular waveguide cavity into an upper part and a lower part, secondary resonance is completed in the divided cavity, and the field distribution characteristic during resonance is consistent with the field direction of the coaxial TEM mode, so that conversion from the waveguide mode to the coaxial mode is completed. By utilizing the multi-stage structure, the length and the thickness of each part of the crank arm probe are adjusted, adjacent resonance frequency points can be generated, and therefore the broadening of a frequency band is obtained.
The invention only needs to accurately control the crank arm probe, and other parts can be solved by adopting the traditional process, so that the invention has the advantages of low cost, simple structure and easy realization, is suitable for the front end of a multi-channel terahertz transceiving system and is used for connecting a waveguide transmission line and a coaxial line.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (6)
1. The terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe is characterized by comprising a waveguide metal shell, wherein the waveguide metal shell is a cuboid, a rectangular waveguide opening is formed in the front end of the waveguide metal shell, a short-circuit back plate is arranged at the rear end of the waveguide metal shell, and a waveguide cavity is formed in the waveguide metal shell;
a coaxial cable connector is arranged on the right side wall of the waveguide metal shell and comprises a crank arm probe, an insulating medium layer is wrapped outside the crank arm probe, an outer conductor layer is wrapped outside the insulating medium layer, and the end part of the outer conductor layer is fixedly connected to the right side wall of the waveguide metal shell;
the right end of the crank arm probe is flush with the right end faces of the insulating medium layer and the outer conductor layer, and the left end of the crank arm probe extends into the waveguide cavity and is connected to the top wall of the waveguide cavity after being bent.
2. The terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe as claimed in claim 1, wherein the coaxial cable connector is arranged at the rear side of the right side wall of the waveguide metal shell, and the coaxial cable connector is close to the short-circuit back plate.
3. The terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe as claimed in claim 1, wherein a through hole with the same diameter as that of the insulating medium layer is opened at the joint of the coaxial cable joint and the right side wall of the waveguide metal shell, and the crank arm probe penetrates through the through hole and extends into the waveguide cavity.
4. The terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe as claimed in claim 1, wherein the left end of the crank arm probe is bent upwards into a step shape in the waveguide cavity and is electrically connected to the top wall of the waveguide cavity, and the junction of the crank arm probe and the top wall of the waveguide cavity is a short circuit point.
5. The terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe according to claim 1, wherein the insulating medium layer and the outer conductor layer are both cylindrical.
6. The terahertz waveguide-coaxial conversion structure based on the waveguide narrow-wall crank arm coaxial probe as claimed in claim 1, wherein the distance between the crank arm probe and the short-circuit back plate is a quarter of the spatial wavelength corresponding to the design center frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874226.XA CN112072250A (en) | 2020-08-27 | 2020-08-27 | Terahertz waveguide-coaxial conversion structure based on waveguide narrow-wall crank arm coaxial probe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874226.XA CN112072250A (en) | 2020-08-27 | 2020-08-27 | Terahertz waveguide-coaxial conversion structure based on waveguide narrow-wall crank arm coaxial probe |
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| CN112072250A true CN112072250A (en) | 2020-12-11 |
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| CN202010874226.XA Pending CN112072250A (en) | 2020-08-27 | 2020-08-27 | Terahertz waveguide-coaxial conversion structure based on waveguide narrow-wall crank arm coaxial probe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113381204A (en) * | 2021-05-19 | 2021-09-10 | 北京交通大学 | Novel planar array antenna |
| CN113517564A (en) * | 2021-04-06 | 2021-10-19 | 浙江大学 | CTS beam scanning antenna based on multilayer suspension strip line structure |
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| US20020186105A1 (en) * | 1999-11-03 | 2002-12-12 | Yi-Chi Shih | Universal millimeter-wave housing with flexible end launchers |
| CN202977676U (en) * | 2012-11-05 | 2013-06-05 | 成都九洲迪飞科技有限责任公司 | Low height waveguide side coupling coaxial converter |
| CN205666315U (en) * | 2016-06-06 | 2016-10-26 | 中国电子科技集团公司第三十八研究所 | Be used for W wave band waveguide - microstrip probe converter |
| CN206293596U (en) * | 2016-08-30 | 2017-06-30 | 江苏贝孚德通讯科技股份有限公司 | A kind of waveguide coaxial connecter device from the output of narrow side |
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| US20200266516A1 (en) * | 2017-05-30 | 2020-08-20 | Fujikura Ltd. | Transmission line and post-wall waveguide |
-
2020
- 2020-08-27 CN CN202010874226.XA patent/CN112072250A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| US20020186105A1 (en) * | 1999-11-03 | 2002-12-12 | Yi-Chi Shih | Universal millimeter-wave housing with flexible end launchers |
| CN202977676U (en) * | 2012-11-05 | 2013-06-05 | 成都九洲迪飞科技有限责任公司 | Low height waveguide side coupling coaxial converter |
| CN205666315U (en) * | 2016-06-06 | 2016-10-26 | 中国电子科技集团公司第三十八研究所 | Be used for W wave band waveguide - microstrip probe converter |
| CN206293596U (en) * | 2016-08-30 | 2017-06-30 | 江苏贝孚德通讯科技股份有限公司 | A kind of waveguide coaxial connecter device from the output of narrow side |
| US20200266516A1 (en) * | 2017-05-30 | 2020-08-20 | Fujikura Ltd. | Transmission line and post-wall waveguide |
| CN208723066U (en) * | 2018-09-21 | 2019-04-09 | 成都博芯联科科技有限公司 | A kind of micro-strip vertical transition structure |
Non-Patent Citations (1)
| Title |
|---|
| JIN LI ET AL.: "A full Ka-band microstrip-to-waveguide transition using side-inserted magnetic coupling semicircular ring", 《WAMICON 2012 IEEE WIRELESS & MICROWAVE TECHNOLOGY CONFERENCE》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517564A (en) * | 2021-04-06 | 2021-10-19 | 浙江大学 | CTS beam scanning antenna based on multilayer suspension strip line structure |
| CN113517564B (en) * | 2021-04-06 | 2024-05-24 | 浙江大学 | CTS wave beam scanning antenna based on multilayer suspension strip line structure |
| CN113381204A (en) * | 2021-05-19 | 2021-09-10 | 北京交通大学 | Novel planar array antenna |
| CN113381204B (en) * | 2021-05-19 | 2023-01-06 | 北京交通大学 | Novel planar array antenna |
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