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

Donaldson, Craig R. and Zhang, Liang and He, Wenlong and Cross, Adrian W. and Ronald, Kevin and Whyte, Colin G. (2021) Low loss transmission line for a 3.4-kW, 93-GHz gyro-traveling-wave amplifier. IEEE Transactions on Electron Devices, 68 (1). pp. 364-368. ISSN 0018-9383 (https://doi.org/10.1109/TED.2020.3039427)

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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.