Wave transmission lines and networks – Plural channel systems – Nonreciprocal gyromagnetic type
Patent
1988-12-27
1990-02-27
Gensler, Paul
Wave transmission lines and networks
Plural channel systems
Nonreciprocal gyromagnetic type
333 242, H01P 1383
Patent
active
049049658
ABSTRACT:
A miniature circulator which is microwave integrated circuit compatible and based on microstrip transmission techniques is described. The circulator includes a dielectric or semiconductor substrate having microstrip transmission lines formed thereon and a patterned metalization formed as the node metalization for the circulator. The substrate may carry other circuits such as power combiners, amplifiers, and switches. The substrate further includes monolithic capacitors over the substrate at the center of the circulator in a first embodiment or disposed along the periphery of the patterned metalization in the second embodiment. The capacitors are used to capacitively couple the patterned metalization or node metalization to the ground plane conductor. The value of capacitance is selected to provide value broadband performance. A ferrite disc, preferably hexagonal in shape, is disposed over the substrate and has disposed thereon a coupling structure, preferably an interwoven coupling structure comprised of two layers of metalization separated by an intermediate layer of insulating material. Preferred techniques for providing said coupling structure are described.
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Knerr, R. H. et al., "A Compact Broad-Band Thin-Film Lumped-Element L-Band Circulator", IEEE Transactions on Microwave Theory and Techniques, Dec. 1970, pp. 1100-1107.
Knerr, R. H., "A 4-GHz Lumped-Element Circulator", IEEE Transactions on Microwave Theory and Techniques, Mar. 1973, pp. 150-151.
Knerr, R. H., "An Annotated Bibliography of Microwave Circulators and Isolators: 1968-1975", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-23, No. 10, Oct. 1975, pp. 818-825.
Ogasawara, N. et al., "Coplanar-Guide and Slot-Guide Junction Circulator", Electronics Letters, May 6th 1971, vol. 7, No. 9, pp. 220-221.
Blight Ronald F.
Mozzi Robert L.
Schloemann Ernst F. R. A.
Gensler Paul
Maloney Denis G.
Raytheon Company
Sharkansky Richard M.
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