Strip line filter and duplexer filter using the same

Details Strip line filter and duplexer filter using the same Strip line filter and duplexer filter using the same

H - Electricity

03

H

H03H 9/46 (2006.01) H01P 1/203 (2006.01) H01P 1/213 (2006.01) H03H 9/24 (2006.01)

Patent

CA 2095773

ABSTRACT OF DISCLOSURE A compact, high performance strip line filter which may be made thinner than a dielectric filter having comparable performance characteristics. The strip line filter includes a rectangular box-shaped, dielectric block having parallel grooves, formed in a front face with a predetermined spacing therebetween, the grooves extending from a top face to a bottom face of the block. A thin film outer conductive layer covers the side faces, the back face, and the bottom face. Resonator conductors, each formed of a thin film of conductive material, cover the respective surfaces of the grooves and are connected to the outer conductor.According to a further aspect, a substrate, with capacitor formed thereon, opposes a face of the dielectric block to provide capacitive coupling. The capacitors may be arranged to provide attenuation poles at finite frequencies. In accordance with another aspect, such strip line filters are used as the transmitting and receiving filters of a duplexer filter.

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