Magnetically tuned resonant circuit

Details Magnetically tuned resonant circuit Magnetically tuned resonant circuit

1982-12-03

1985-09-24

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Nonreciprocal gyromagnetic type

333204, 333219, H01P 132, H01P 708

Patent

active

045435430

ABSTRACT:
A magnetically tuned resonant circuit for selectively coupling radio frequency (r.f.) energy between an input coupling circuit and an output coupling circuit through a resonant body disposed between such coupling circuits. Each coupling circuit includes a plurality of spaced conductors which are arranged to selectively spatially distribute r.f. energy fed thereto in order to provide, in the region where the resonant body is disposed, a magnetic field having a predetermined spatial distribution. Such magnetic field distribution is selected in accordance with characteristics of the resonant body to reduce coupling of unwanted spurious r.f. energy through the magnetically tuned resonant circuit.
Further, a ground plane conductor associated with such coupling circuits has a selected portion thereof removed to provide a void therein, and a portion of the resonant body is disposed within the void provided in the ground plane. The size of the void is selected to increase coupling of r.f. energy through the resonant body, between the input and the output coupling circuits and to reduce coupling of r.f. energy between the body and the ground plane conductor and hence the r.f. energy loss concomitant therewith, without substantially affecting the desired coupling between the coupling circuits.

REFERENCES:
patent: 3368169 (1968-02-01), Carter et al.
patent: 3546637 (1970-12-01), Wen
patent: 3648199 (1972-03-01), Buck et al.
patent: 3740675 (1973-06-01), Moore et al.
patent: 3771075 (1973-11-01), Phelan
patent: 3838367 (1974-09-01), Bex
"Magnetically-Tunable Microwave Filters Using Single-Crystal Yttrium-Iron-Garnet Resonators", by Philip S. Carter, IRE Transactions on Microwave Theory and Techniques, May 1961.

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