Design of Compact and Easy-to-Fabricate Power Coupling Structures for Sub-Terahertz Sheet Beam Traveling Wave Amplifiers

The great challenge in fabrication is one of the most significant factors for hindering the development of subterahertz sheet beam traveling wave amplifiers (SB-TWAs). Therefore, it is in great demand to develop power coupling structures and slow wave structures with easy-to-fabricate and compact ge...

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Veröffentlicht in:IEEE transactions on microwave theory and techniques 2022-05, Vol.70 (5), p.2622-2630
Hauptverfasser: He, Jingcong, Shu, Guoxiang, Liao, Jiacai, Ren, Junchen, Deng, Junzhe, Lin, Jujian, Ruan, Cunjun, He, Wenlong
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container_issue 5
container_start_page 2622
container_title IEEE transactions on microwave theory and techniques
container_volume 70
creator He, Jingcong
Shu, Guoxiang
Liao, Jiacai
Ren, Junchen
Deng, Junzhe
Lin, Jujian
Ruan, Cunjun
He, Wenlong
description The great challenge in fabrication is one of the most significant factors for hindering the development of subterahertz sheet beam traveling wave amplifiers (SB-TWAs). Therefore, it is in great demand to develop power coupling structures and slow wave structures with easy-to-fabricate and compact geometries for SB-TWAs. In addition, it is desirable that their heights are as small as possible, thus conducive to the focusing of the sheet electron beam. In this article, two novel power coupling structures are designed, which are based on an H -plane short-slot and multiple branch waveguides, respectively. The former one is highlighted by its compactness, and the latter one has a wider frequency bandwidth. Two proof-of-concept prototypes of the proposed power coupling structures were microfabricated and tested, showing excellent agreement between experimental measurements and design simulations. Reflection coefficient
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Therefore, it is in great demand to develop power coupling structures and slow wave structures with easy-to-fabricate and compact geometries for SB-TWAs. In addition, it is desirable that their heights are as small as possible, thus conducive to the focusing of the sheet electron beam. In this article, two novel power coupling structures are designed, which are based on an <inline-formula> <tex-math notation="LaTeX">H </tex-math></inline-formula>-plane short-slot and multiple branch waveguides, respectively. The former one is highlighted by its compactness, and the latter one has a wider frequency bandwidth. Two proof-of-concept prototypes of the proposed power coupling structures were microfabricated and tested, showing excellent agreement between experimental measurements and design simulations. Reflection coefficient <−13.6 dB, isolation coefficient <−15.4 dB, and transmission coefficient >−2.2 dB were experimentally obtained across the band of 220.0-273.4 GHz (53.4 GHz). 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Therefore, it is in great demand to develop power coupling structures and slow wave structures with easy-to-fabricate and compact geometries for SB-TWAs. In addition, it is desirable that their heights are as small as possible, thus conducive to the focusing of the sheet electron beam. In this article, two novel power coupling structures are designed, which are based on an <inline-formula> <tex-math notation="LaTeX">H </tex-math></inline-formula>-plane short-slot and multiple branch waveguides, respectively. The former one is highlighted by its compactness, and the latter one has a wider frequency bandwidth. Two proof-of-concept prototypes of the proposed power coupling structures were microfabricated and tested, showing excellent agreement between experimental measurements and design simulations. Reflection coefficient <−13.6 dB, isolation coefficient <−15.4 dB, and transmission coefficient >−2.2 dB were experimentally obtained across the band of 220.0-273.4 GHz (53.4 GHz). 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subjects Bandwidth
Bandwidths
Branch waveguide
Couplers
Coupling
Couplings
Electron beams
Focusing
Frequency measurement
Frequency ranges
Geometry
Network analysers
power coupling structure
Reflectance
sheet-beam traveling wave amplifier (SB-TWA)
subterahertz (THz) band
Traveling wave amplifiers
Traveling waves
Waveguides
title Design of Compact and Easy-to-Fabricate Power Coupling Structures for Sub-Terahertz Sheet Beam Traveling Wave Amplifiers
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