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

Jason R. Garner, Liang Zhang, Craig R. Donaldson, Adrian W. Cross, Wenlong He

Research output: Contribution to journalArticle

28 Citations (Scopus)
141 Downloads (Pure)

Abstract

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.
Original languageEnglish
Number of pages7
JournalIEEE Transactions on Electron Devices
Volume63
Issue number1
Early online date26 Nov 2015
DOIs
Publication statusPublished - 31 Jan 2016

Keywords

  • gyrotron-traveling wave amplifier (gyro-TWA)
  • mode coupling
  • terahertz input coupler
  • waveguide coupler

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