Design of transmission line for submillimeter wave gyrotron using dielectric-lined waveguide

摘要

The excitation and transmission losses of a dielectric-lined waveguide is computed with real, experimentally measured output beams of a submillimeter wave gyrotron. The operating frequency band of the FU series gyrotrons extends from 164 GHz till 889 GHz, and new gyrotrons are expected to achieve 1 THz, this means submillimeter wave and far-infrared regions. It is shown that for `not-so-long' transmission lines, the coupling losses far exceed the transmission losses in the waveguide.