A New Type of Dielectric Resonator Filter

This paper discusses a new type of dielectric resonator filter wherein the cylindrical dielectric resonators have been enclosed in evanescent cylindrical metallic cavities. The electromagnetic fields inside the metallic cavity have been derived assuming the dipolar TE01p dielectric resonator as a density of magnetic moment centered inside the metallic cavity. Coupling between two such cavities has been determined and a two cavity filter has been realised which shows good agreement with the theoretical results.