Whispering gallery dielectric resonator mode GaAs FET oscillator

High permittivity whispering gallery mode (WGM) dielectric resonators have been used in preference to fundamental mode dielectric resonators because of their high quality factor; good suppression of spurious modes and reasonable mechanical dimensions at millimetre wavelength frequencies. In the paper a WGM dielectric resonator directional filter employed in a shunt feedback configuration in a GaAs FET oscillator at C-band is presented. Good oscillator output power and low phase noise close to the carrier have been achieved