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Design study of a fundamental mode input coupler for a 372-GHz gyro-TWA I : rectangular-to-circular coupling methods

Garner, Jason R. and Zhang, Liang and Donaldson, Craig R. and Cross, Adrian W. and He, Wenlong (2016) Design study of a fundamental mode input coupler for a 372-GHz gyro-TWA I : rectangular-to-circular coupling methods. IEEE Transactions on Electron Devices, 63 (1). ISSN 0018-9383

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    The design of two fundamental mode rectangular-to-circular waveguide input couplers for a low-terahertz gyrotron-traveling wave amplifier (gyro-TWA) is presented. A T-junction input coupler with a Bragg reflector and a multiple-hole directional coupler were optimized for operation between 360 and 384 GHz, the proposed gyro-TWA bandwidth. The T-junction coupler and the multiple-hole coupler achieved the respective bandwidths of 10% and 35%. The benefits and potential limitations of the low-terahertz wave coupler topologies are discussed alongside the challenging manufacturing methods of the submillimeter-wave components.