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A pillbox window with impedance matching sections for a W-band gyro-TWA

Zhang, Liang and Donaldson, Craig R. and Cross, Adrian W. and He, Wenlong (2018) A pillbox window with impedance matching sections for a W-band gyro-TWA. IEEE Electron Device Letters. ISSN 0741-3106

Text (Zhang-etal-IEEE-EDL-2018-A pillbox-window-with-impedance-matching-sections-for-a-W-band-gyro-TWA)
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A mode-matching method was developed to design a pillbox-type millimeter wave window for a W-band gyrotron traveling wave amplifier. With additional impedance matching sections, the pillbox window was able to achieve -40 dB reflection over a 10% frequency bandwidth. The manufactured pillbox window achieved a maximum reflection of -15 dB. The reasons for the difference between the simulated and measured reflections were investigated.