Band elimination filter and duplexer

Details Band elimination filter and duplexer Band elimination filter and duplexer

1998-12-16

2000-12-05

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333202, 333205, 333134, H01P 120, H01P 512

Patent

active

061572748

ABSTRACT:
The invention provides a band elimination filter, comprising: a ring shaped resonator adapted to resonate in two orthogonal modes combined together; one input-output terminal electrically connected to said ring shaped resonator; and a perturbation portion disposed in said ring shaped resonator. The perturbation portion may be composed of a portion of said ring shaped resonator at which a pattern width is different from the other portion of said ring shaped resonator. Or, the perturbation portion may be composed a lumped constant passive element.

REFERENCES:
patent: Re34898 (1995-04-01), Turunen et al.
patent: 3153209 (1964-10-01), Kaiser
patent: 4327342 (1982-04-01), De Ronde
patent: 5172084 (1992-12-01), Fiedziuszko et al.
patent: 5659274 (1997-08-01), Takahashi et al.
patent: 5721195 (1998-02-01), Grothe et al.
UK Search Report dated Mar. 31, 1999.

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