Eaton Corporation

John A Mezak

William J Keane

Ronald A Parrott

The variation in the external bandwidth of input and output resonators of YIG filters and of single resonator device, is corrected by means of frequency selective impedance transformers. The transformers are comprised of specific impedance transmission lines which may be incorporated as integral parts of the YIG filter RF circuit.

Method for enhancing ferromagnetic coupling

Ferromagnetic resonant devices include special coupling loops formed of multi-conductor transmission lines to increase the RF electromagnetic coupling to the ferromagnetic resonators, while decreasing coupling to spurious resonant modes.

Multi-conductor ferromagnetic resonant coupling structure

Compact, simple, ferromagnetic-filter coupling structures which provide a very high, effective-quality factor Q in the VHF, UHF, and microwave frequency ranges achieved by means of offsetting the ferromagnetic element from the plane of the coupling loops and by phase shifting the current in one of the coupling loops to produce an orthogonal field in the vicinity of the ferromagnetic element.

High performance ferromagnetic filters applicable from the VHF through

Compact, simple, ferromagnetic-filter coupling structures which provide a very high, effective-quality factor Q in the VHF, UHF, and microwave frequency ranges.

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San Jose, CA, United States of America

John A Mezak