ELECTRONICALLY TUNABLE MICROWAVE BANDPASS FILTER
HARRY DIAMOND LABS ADELPHI MD
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An equivalent circuit of two orthogonal striplines coupled by a ferrite yttrium iron garnet sphere is derived, using the scattering matrix method. This derivation shows that a nonreciprocal phase shifter can be represented by gyrator networks. Based on this analysis, a YIG bandpass filter, electronically tunable over a very broad frequency range 41, is designed by coupling two broadband 180-deg phase shift circuits with a small single crystal YIG sphere. The report also reviews some basic principles pertaining to filter considerations, analyzes the filter circuit of two orthogonal striplines coupled by a ferrite sphere, and synthesizes the equivalent filter circuit by a scattering matrix method. These results describe the operation of the filter circuit under various terminal excitations.
- Electrical and Electronic Equipment