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Input coupling systems for millimetre-wave gyrotron travelling wave amplifiers

Zhang, Liang and Donaldson, Craig R. and Garner, Jason and Cross, Adrian W. and He, Wenlong (2018) Input coupling systems for millimetre-wave gyrotron travelling wave amplifiers. IET Microwaves, Antennas & Propagation. pp. 1-4. ISSN 1751-8725

Text (Zhang-etal-IET-2018-Input-coupling-systems-for-millimetre-wave-gyrotron)
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    Input couplers for millimetre-wave gyrotron travelling wave amplifiers are presented in this study. A W-band input coupling system composed of a pillbox window, a smoothly curved waveguide bend, a T-junction and a broadband reflector was numerically optimised, constructed and measured. An average transmission coefficient of −2.0 dB over a designed operating frequency range was measured. Additionally, a higher-frequency input coupler for operation at a central frequency of 372 GHz was also designed based on a multiple-hole coupling configuration. The simulated transmission coefficient was −0.5 dB if the ohmic loss is not considered.