Study of an Attenuator Supporting Meander-Line Slow Wave Structure for Ka-Band TWT
An attenuator supporting meander-line (ASML) slow wave structure (SWS) is proposed for a Ka-band traveling wave tube (TWT) and studied by simulations and experiments. The ASML SWS simplifies the fabrication and assembly process of traditional planar metal meander-lines (MLs) structures, by employing...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-09-01
|
| Series: | Electronics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-9292/10/19/2372 |
| _version_ | 1797516681824698368 |
|---|---|
| author | Hexin Wang Shaomeng Wang Zhanliang Wang Xinyi Li Tenglong He Duo Xu Zhaoyun Duan Zhigang Lu Huarong Gong Yubin Gong |
| author_facet | Hexin Wang Shaomeng Wang Zhanliang Wang Xinyi Li Tenglong He Duo Xu Zhaoyun Duan Zhigang Lu Huarong Gong Yubin Gong |
| author_sort | Hexin Wang |
| collection | DOAJ |
| description | An attenuator supporting meander-line (ASML) slow wave structure (SWS) is proposed for a Ka-band traveling wave tube (TWT) and studied by simulations and experiments. The ASML SWS simplifies the fabrication and assembly process of traditional planar metal meander-lines (MLs) structures, by employing an attenuator to support the ML on the bottom of the enclosure rather than welding them together on the sides. To reduce the surface roughness of the molybdenum ML caused by laser cutting, the ML is coated by a thin copper film by magnetron sputtering. The measured S<sub>11</sub> of the ML is below −20 dB and S<sub>21</sub> varies around −8 dB to −12 dB without the attenuator, while below −40 dB with the attenuator. Particle-in-cell (PIC) simulation results show that with a 4.4-kV, 200-mA sheet electron beam, a maximum output power of 126 W is obtained at 38 GHz, corresponding to a gain of 24.1 dB and an electronic efficiency of 14.3%, respectively. |
| first_indexed | 2024-03-10T07:04:17Z |
| format | Article |
| id | doaj.art-e2c44ada95324b85a570d44970deeb37 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-10T07:04:17Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-e2c44ada95324b85a570d44970deeb372023-11-22T15:56:44ZengMDPI AGElectronics2079-92922021-09-011019237210.3390/electronics10192372Study of an Attenuator Supporting Meander-Line Slow Wave Structure for Ka-Band TWTHexin Wang0Shaomeng Wang1Zhanliang Wang2Xinyi Li3Tenglong He4Duo Xu5Zhaoyun Duan6Zhigang Lu7Huarong Gong8Yubin Gong9National Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaNational Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaNational Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaNanjing Sanle Electronic Group Co., Ltd., Nanjing 211800, ChinaNational Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaNational Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaNational Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaNational Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaNational Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaNational Key Lab on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, ChinaAn attenuator supporting meander-line (ASML) slow wave structure (SWS) is proposed for a Ka-band traveling wave tube (TWT) and studied by simulations and experiments. The ASML SWS simplifies the fabrication and assembly process of traditional planar metal meander-lines (MLs) structures, by employing an attenuator to support the ML on the bottom of the enclosure rather than welding them together on the sides. To reduce the surface roughness of the molybdenum ML caused by laser cutting, the ML is coated by a thin copper film by magnetron sputtering. The measured S<sub>11</sub> of the ML is below −20 dB and S<sub>21</sub> varies around −8 dB to −12 dB without the attenuator, while below −40 dB with the attenuator. Particle-in-cell (PIC) simulation results show that with a 4.4-kV, 200-mA sheet electron beam, a maximum output power of 126 W is obtained at 38 GHz, corresponding to a gain of 24.1 dB and an electronic efficiency of 14.3%, respectively.https://www.mdpi.com/2079-9292/10/19/2372meander-linesurface roughnessS-parametersslow wave structuretraveling wave tube |
| spellingShingle | Hexin Wang Shaomeng Wang Zhanliang Wang Xinyi Li Tenglong He Duo Xu Zhaoyun Duan Zhigang Lu Huarong Gong Yubin Gong Study of an Attenuator Supporting Meander-Line Slow Wave Structure for Ka-Band TWT Electronics meander-line surface roughness S-parameters slow wave structure traveling wave tube |
| title | Study of an Attenuator Supporting Meander-Line Slow Wave Structure for Ka-Band TWT |
| title_full | Study of an Attenuator Supporting Meander-Line Slow Wave Structure for Ka-Band TWT |
| title_fullStr | Study of an Attenuator Supporting Meander-Line Slow Wave Structure for Ka-Band TWT |
| title_full_unstemmed | Study of an Attenuator Supporting Meander-Line Slow Wave Structure for Ka-Band TWT |
| title_short | Study of an Attenuator Supporting Meander-Line Slow Wave Structure for Ka-Band TWT |
| title_sort | study of an attenuator supporting meander line slow wave structure for ka band twt |
| topic | meander-line surface roughness S-parameters slow wave structure traveling wave tube |
| url | https://www.mdpi.com/2079-9292/10/19/2372 |
| work_keys_str_mv | AT hexinwang studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT shaomengwang studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT zhanliangwang studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT xinyili studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT tenglonghe studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT duoxu studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT zhaoyunduan studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT zhiganglu studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT huaronggong studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt AT yubingong studyofanattenuatorsupportingmeanderlineslowwavestructureforkabandtwt |