Resonator and a filter including the same

Details Resonator and a filter including the same Resonator and a filter including the same

1990-05-31

1991-10-08

LaRoche, Eugene R.

Wave transmission lines and networks

Resonators

333204, H01P 708, H01P 1203

Patent

active

050558099

ABSTRACT:
A resonator having a strip line, the strip line comprising: a first portion forming an open loop; and two second portions, each provided to each end of the first portion, the second portions facing each other with a given distance therebetween, the distance and length of the second portion being determined such that necessary capacitance is provided. The capacitor is provided instead of a discrete capacitor for saving space and for reducing dielectric loss therein. A second resonator further comprises second and third capacitor having a semicircle strip-line patterns for providing capacitances between ends of the first portion and grounded planes which decrease the resonance frequency so that size of the second resonator are reduced. A third resonator also comprises the first capacitor, but arranged outside of the first portion. Capacitance of the first capacitor can be increased by teeth provided to the second portions. A filter comprises plural third resonators so arranged that coupling between the resonators is obtained by one selected from magnetic-field coupling through the first portions, electromagnetic-field coupling through first and second portions, and electric-field coupling through second portions.

REFERENCES:
patent: 4020429 (1977-04-01), Bickley
patent: 4749963 (1988-06-01), Makimoto et al.

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