NOVEL DIELECTRIC WAVE-GUIDE COMPONENTS - MICROWAVE APPLICATIONS OF NEW CERAMIC MATERIALS

Thus far, high dielectric constant ceramic materials have been used to make coaxial guide resonators and dielectric resonators, such as TE01-delta mode and dielectric loaded hybrid mode resonators, in filter applications. This paper shows several dielectric-waveguide components utilizing appropriate metallized surface structures on dielectric ceramics. Using magnetic walls, easily realized with ceramics, several dielectric components of a type quite different from conventional hollow waveguide components are realized. Multistage bandpass filters (BPF's) with tandem connection of quarter-wave resonators are realized on the same dielectric waveguide; Multistage BPF's with coaxial resonators in waveguide are also shown. Components similar to earlier dielectric waveguide components are made smaller by taking the image half-section. Coupling to waveguide can be realized by a probe, easily realized as a metallized hole in a dielectric waveguide, or via the open surface corresponding to a magnetic wall loaded with the proper metallic surface patterns. The components mentioned above are described together with experimental performance data.