Gyro-TWT Using a Metal PBG Waveguide as Its RF Circuit—Part I: Analysis and Design

A gyro-TWT using a metal photonic bandgap (PBG) waveguide as its RF circuit has been analyzed using a self-consistent nonlinear analysis. The analysis focuses on single-mode operation of gyro-TWT by eliminating the mode competition problem existing in an overmoded structure using a mode-selective PBG circuit. A Ka-band, TE
₀₁
waveguide mode PBG gyro-TWT has been designed, and analytical results have been computed to demonstrate the beam–wave interaction mechanism of the device. The nonlinear analysis predicted
$\sim 91$
-kW RF output power with an electronic efficiency of
$\sim 13$
% and the saturated gain of
$\sim 40$
dB from this device.