Patent ID: 6081174
Filing Date: 2000-06-27
Classification: H01P

Abstract:
A dielectric wave filter having at least two dielectric resonators in juxtaposition, each dielectric resonator comprising:(a) a dielectric body having a pair of opposite end surfaces, a first side surface, a second side surface contiguous to the first side surface and confronting the other dielectric body, a third side surface contiguous to the second side surface, a fourth side surface contiguous to both first and third side surfaces and facing away from the other dielectric body, and a resonance hole extending between the pair of end surfaces;(b) an inner conductor covering an inner surface of the dielectric body;(c) an outer conductor covering parts of the side surfaces of the dielectric body, which parts are contiguous to one of the end surfaces of the dielectric body, the outer conductors on both dielectric bodies being joined to each other both mechanically and electrically;(d) a shorting conductor covering said one end surface of the dielectric body and electrically interconnecting the inner and the outer conductors;(e) a resonator coupling conductor covering parts of the first and second side surfaces of each dielectric body which confronts the other dielectric body, the resonator coupling conductors on both dielectric bodies being joined to each other both mechanically and electrically;(f) a terminal conductor covering parts of the third and fourth side surfaces of each dielectric body and disposed adjacent the other of the end surfaces thereof, the terminal conductors on both dielectric bodies being disposed at least on those side surfaces of the dielectric bodies which face away from each other; and(g) a first outer conductor extension extending from the outer conductor on each dielectric body toward said other end surface thereof, the first outer conductor extensions on both dielectric bodies being disposed on parts of the second side surfaces of the dielectric bodies which confront each other, and parts of the third side surfaces thereof;(h) a second outer conductor extension extending from the outer conductor on each dielectric body toward said other end surface thereof, the second outer conductor extension on each dielectric body being disposed on parts of the first and fourth side surfaces thereof; and(i) an inner conductor extension disposed on said other end surface of each dielectric body and joined to the inner conductor thereof, the inner conductor extension being so patterned on said other end surface of each dielectric body that capacitance between the inner conductor extension and the resonator coupling conductor is less than capacitance between the inner conductor extension and each outer conductor extension, and that capacitance between the inner conductor extension and the terminal conductor is less than capacitance between the inner conductor extension and each outer conductor extension.