Experiments on precise frequency tuning in the FEM oscillator with the Bragg resonator

摘要

It is known that precise frequency tuning of a FEM oscillator with a Bragg resonator could be performed by changing the corrugation phase shift between the reflectors. This report presents new experimental results obtained using a tunable band-pass waveguide filter as well as a heterodyne technique to measure the spectrum. The 30 GHz FEM oscillator was tuned over a frequency range of 6% with a precision of about 0.2%. In all regimes the radiation spectrum width did not exceed 0.1%. The dependence of the operating frequency on the value of the corrugation phase shift is in good agreement with previous simulation results.