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W-band quasi-optical mode converters for gyro-devices

McElhinney, P. and Donaldson, C. R. and Zhang, L. and Cross, A. W. and He, W. (2014) W-band quasi-optical mode converters for gyro-devices. In: 2nd IET Annual Active and Passive RF Devices Seminar. Institution of Engineering and Technology, pp. 4-7. ISBN 9781849199728

Text (McElhinney-etal-IET-2014-A-quasi-optical-mode-converter-for-a-w-band-gyrotron)
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    A W-band corrugated horn has been designed, manufactured, and experimentally measured at the University of Strathclyde, for integration into a gyro-device as a quasi-optical launcher. This horn converts a cylindrical TE11 mode into a free space TEM00 mode in a frequency band of 84-104 GHz with a reflection better than-30 dB and a Gaussian coupling efficiency of ∼98% and directivity of 26.6 dB at 95 GHz. The Gaussian output of the horn and small beam waist makes such a horn ideal for integration with applications and for use with a depressed collector system. The measured results are in excellent agreement with the numerical simulations.