MM wave resonator technique for dielectric investigations

A technique for measuring complex dielectric permittivity in the 118-178 GHz frequency range is suggested. The combination of a high-quality Fabry-Perot resonator, excited by a BWO (backward wave oscillator)-generator, with the good processing capability of a sensitive receiver, based on the Tektronix 2782 spectrum analyzer (using the WM782 (F-G) harmonic mixers), opens the possibility of a new measuring technique.