Patent Number: 6,294,967

Title: Laminated type dielectric filter

Abstract: A laminated type dielectric filter including a first stage symmetric type strip line resonator and a last stage symmetric type strip line resonator each having at least two resonating elements arranged to oppose one another via dielectric layers, said resonators being aligned in a direction perpendicular to a stacking direction in which said resonating elements are stacked, an input electrode for coupling the first stage symmetric type strip line resonator to an input terminal, an output electrode for coupling the last stage symmetric type dielectric filter to an output terminal, an earth electrode substantially surrounding an outer surface of the laminated type dielectric filter, plural interlayer earth electrodes connected to the earth electrode, and one or more coupling electrode for coupling said plural symmetric type strip line resonators, said the resonating elements, input electrode, output electrode, interlayer earth electrodes and coupling electrodes are isolated by means of dielectric layers, and electrodes of at least one kind of electrode among the above mentioned electrodes are arranged between adjacent resonating elements such that capacitances between the resonating elements and these electrodes are increased to improve filter characteristics.

Inventors: Hirai; Takami (Aichi Pref., JP), Mizuno; Kazuyuki (Tokoname, JP), Mizutani; Yasuhiko (Komaki, JP)

Assignee: NGK Insulators, Ltd.

International Classification: H01P 1/203 (20060101); H01P 1/20 (20060101); H01P 001/20 (); H01P 007/10 ()

Expiration Date: 09/25/2018