In this paper, a W-band mode converter is designed using a circular corrugated horn and its detailed numerical study is presented. The proposed mode converter was fabricated, and the measured results are validated. The device converts fundamental mode (TE 11 ) into a Hybrid mode (HE 11 ) mode in a frequency range of 75 GHz to 105 GHz. The reflection coefficient is less than −15 dB and a peak directivity of 24.5 dB is achieved. The corrugated horn also shows good mode purity. The measured gain of the device was found to be 18.05 dB. The designed mode converter will be useful in Electron CyclotronResonance Heating system for fusion plasma experiments. K E Y W O R D S circular corrugated waveguide, hybrid mode, mode converter, W-band

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