Theoretical method for fast optimization of rectangular transition structure in folded waveguide devices

Cai Jinchi; Hu Linlin; Ma Guowu; Chen Hongbin; Jin Xiao; Chen Huaibi

doi:10.11884/HPLPB201527.053101

Volume 27 Issue 05

Apr. 2015

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Article Navigation > High Power Laser and Particle Beams > 2015 > 27(05): 053101

Wang Feng, Zhang Xing, Li Yulong, et al. Progress in high time- and space-resolving diagnostic technique for laser-driven inertial confinement fusion[J]. High Power Laser and Particle Beams, 2020, 32: 112002. doi: 10.11884/HPLPB202032.200136

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Cai Jinchi, Hu Linlin, Ma Guowu, et al. Theoretical method for fast optimization of rectangular transition structure in folded waveguide devices[J]. High Power Laser and Particle Beams, 2015, 27: 053101. doi: 10.11884/HPLPB201527.053101

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Theoretical method for fast optimization of rectangular transition structure in folded waveguide devices

doi: 10.11884/HPLPB201527.053101

1.
Department of Engineering Physics,Tsinghua University,Beijing 100084,China;
2.
Institute of Applied Electronics,CAEP,Mianyang 621900,China

Received Date: 2014-12-09
Rev Recd Date: 2015-03-05
Publish Date: 2015-04-24

Abstract

Abstract

In this paper, the analytical equations based on mode-coupling theory are derived to facilitate the design process of rectangular transition structure in folded waveguide devices. As an important component of the power coupler, two common categories of structures are considered to match the TE10 modes in rectangular waveguide in folded waveguide slow wave structure into the TE10 mode in the standard rectangular waveguide port. By comparison, the tapered transition structure is much longer than the laddered transition structure with the same reflection requirement, whereas the former has a naturally much broader frequency bandwidth and less sensitivity to configuration errors. As an example, both the laddered and tapered rectangular transitions are designed and error-analyzed for 220 GHz FW Backward Wave Oscillator (BWO). The theoretical method adopted in design process is finally verified by numeric simulation, which shows excellent agreement. The design period based on the accurate theoretical method is only several minutes.
- folded waveguide,
- rectangular transition,
- numeric simulation

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