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

1994-10-20

1996-01-23

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333204, 333205, 333206, 333207, H01P 512, H01P 1202, H01P 1203

Patent

active

054867991

ABSTRACT:
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.

REFERENCES:
patent: 4768003 (1988-08-01), Kawakami et al.
patent: 4987393 (1991-01-01), Yorita et al.
patent: 5130683 (1992-07-01), Agahi-Kesheh et al.
patent: 5160905 (1992-11-01), Hoang
patent: 5293141 (1994-03-01), Kohayashi et al.

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