An output coupler for a W-band high power wideband gyro-amplifier

Paul McElhinney, Craig R. Donaldson, Johannes E. McKay, Liang Zhang, Duncan A. Robertson, Robert I. Hunter, Graham M. Smith, Wenlong He, Adrian W. Cross

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Abstract

An output coupler for a W-band high power wideband gyro-amplifier has been designed, manufactured and experimentally measured. It consists of a high performance sin2-parallel corrugated horn integrated with a broadband multi-layer window. The major design requirements are that the horn/window combination must have an input return loss lower than -30 dB over a 10 GHz bandwidth, provide a high quality output beam pattern, and operate under ultra-high vacuum conditions. The coupler converts a circular waveguide TE11 mode into the free space Laguerre Gaussian LG00 mode over the frequency band of 90–100 GHz with a measured return loss of between -30 and -40 dB and a simulated Gaussian coupling efficiency of over 99% at 94 GHz.
Original languageEnglish
Number of pages4
JournalIEEE Transactions on Electron Devices
Early online date16 Feb 2017
DOIs
Publication statusE-pub ahead of print - 16 Feb 2017

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Keywords

  • corrugated horn
  • Gaussian coupling
  • microwave window
  • W-band
  • gyro-amplifier
  • high power
  • wideband
  • input return loss

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