TY - JOUR
T1 - Design of Compact and Easy-to-Fabricate Power Coupling Structures for Sub-Terahertz Sheet Beam Traveling Wave Amplifiers
AU - He, Jingcong
AU - Shu, Guoxiang
AU - Liao, Jiacai
AU - Ren, Junchen
AU - Deng, Junzhe
AU - Lin, Jujian
AU - Ruan, Cunjun
AU - He, Wenlong
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2022/5/1
Y1 - 2022/5/1
N2 - 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 <-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). Hopefully, a wider measured frequency bandwidth will be obtained if the operating frequency range of the vector network analyzer could be extended to lower frequencies.
AB - 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 <-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). Hopefully, a wider measured frequency bandwidth will be obtained if the operating frequency range of the vector network analyzer could be extended to lower frequencies.
KW - Branch waveguide
KW - Power coupling structure
KW - Sheet-beam traveling wave amplifier (SB-TWA)
KW - Subterahertz (THz) band
UR - https://www.scopus.com/pages/publications/85125750386
U2 - 10.1109/TMTT.2022.3151251
DO - 10.1109/TMTT.2022.3151251
M3 - 文章
AN - SCOPUS:85125750386
SN - 0018-9480
VL - 70
SP - 2622
EP - 2630
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
IS - 5
ER -