Low loss transmission line for a 3.4-kW, 93-GHz gyro-traveling-wave amplifier

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Abstract

In this article, a transmission line system for the propagation of millimeter-wave radiation is presented. The full system includes a TE11-to-TE01 mode converter, waveguide tapers, miter bends, and many straight sections. The design of each of these components is described, and the optimized simulation results are given. The mode converter shows a greater than 96% mode conversion efficiency that can be achieved over a 2% bandwidth at the ${W}$ -band. The miter bends demonstrate a transmission loss of 0.04 dB each over the same bandwidth when they are configured to introduce a mixture of higher order waveguide modes before the reflecting surface. An example transmission line system with a propagation length of 20 m, inclusive of four 90° bends with an oxygen-free high conductivity (OFHC) copper waveguide material, was studied over a 90-96-GHz frequency range and showed a 0.84-dB transmission loss at 93 GHz.

Original languageEnglish
Pages (from-to)364-368
Number of pages5
JournalIEEE Transactions on Electron Devices
Volume68
Issue number1
Early online date8 Dec 2020
DOIs
Publication statusPublished - 6 Jan 2021

Keywords

  • transmission line
  • mode converter
  • mitre bend
  • gyro-travelling wave tube

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