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An output coupler for a W-band high power wideband gyro-amplifier

McElhinney, Paul and Donaldson, Craig R. and McKay, Johannes E. and Zhang, Liang and Robertson, Duncan A. and Hunter, Robert I. and Smith, Graham M. and He, Wenlong and Cross, Adrian W. (2017) An output coupler for a W-band high power wideband gyro-amplifier. IEEE Transactions on Electron Devices. ISSN 0018-9383

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    An output coupler for a W-band high power wideband gyro-amplifier has been designed, manufactured and experimentally measured. It consists of a high performance sin2-parallel corrugated horn integrated with a broadband multi-layer window. The major design requirements are that the horn/window combination must have an input return loss lower than -30 dB over a 10 GHz bandwidth, provide a high quality output beam pattern, and operate under ultra-high vacuum conditions. The coupler converts a circular waveguide TE11 mode into the free space Laguerre Gaussian LG00 mode over the frequency band of 90–100 GHz with a measured return loss of between -30 and -40 dB and a simulated Gaussian coupling efficiency of over 99% at 94 GHz.