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Optimization and measurement of a smoothly profiled horn for a W-band gyro-TWA

Zhang, Liang and He, Wenlong and Donaldson, Craig R. and Smith, Graham M. and Robertson, Duncan A. and Hunter, Robert I. and Cross, Adrian W. (2017) Optimization and measurement of a smoothly profiled horn for a W-band gyro-TWA. IEEE Transactions on Electron Devices. pp. 1-6. ISSN 0018-9383

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    In this paper, a smoothly profiled horn was designed and manufactured to replace a corrugated output horn for a W-band gyro-TWA with improved ultra-high vacuum compatibility. It was optimized for high vacuum integrity, low reflection, high fundamental Gaussian mode content, low side lobe levels and high directivity over the frequency bandwidth of 90 - 100 GHz. Over this operating frequency band the reflectivity was better than -37 dB and the coupling to a fundamental Gaussian mode was above 97%. The far field pattern showed a directivity of approximately 27 dB in the measurement with side lobes lower than -30 dB.