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Abstract
The design of a higher order mode (HOM) input coupler for a low-terahertz gyrotron travelling wave amplifier is presented. A two-branch waveguide coupler based on the even distribution of incident power is designed to couple the rectangular TE10 mode to the circular TE61 mode. The optimised tapered waveguide input coupler achieved an operating frequency range of 359–385 GHz, equating to a bandwidth of 7%. A prototype waveguide coupler scaled to $W$ -band (75–110 GHz) was manufactured. The vector network analyser measured return loss of the HOM coupler is shown to be <10 dB at 90–96 GHz. A transmission and phase measurement is presented to analyse TE61 mode conversion in the coupler.
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