Design of Compact, Coherent, High Power THz Backward-Wave Oscillator

High power THz BWOs are being investigated for communication, defence, space, bio sensing, spectroscopy, etc. The RF SWS is the most critical component for a high power BWO because it primarily decides the efficiency, tuning range, and spectral purity of a BWO. Analytical design tools are developed for designing RF-SWS and determining cold and hot RF performance of a BWO. The design of SWS and RF performance of various published THz BWOs, are evaluated using analytical design tools and compared with the published results of different BWOs. The comparative results for a 110mW, 1THz BWO are presented in this paper.