Miniature planar filters based on dual mode resonators of circul

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

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333219, 333 99S, 505866, H01P 1203, H01P 708

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active

051720841

ABSTRACT:
Planar dual mode filters (30) are formed by a conductive resonator (20) having circular symmetry and two pairs of symmetrically oriented planar conductive leads (22, 26 and 24, 28). The conductive leads (22, 26 and 24, 28) are aligned colinearly with two orthogonal diameters (32, 34, respectively) of the circular conductive resonator (20) and are electrically isolated from said resonator (20). A perturbation (38) located on an axis (36) oriented symmetrically with respect to the two pairs of conductive lead (22, 26 and 24, 28) couples electromagnetic modes which are injected into the resonator (20) by the planar conductive leads (22, 26 and 24, 28). Higher order filter circuits can be realized by combining multiple filters (30) of the present invention. The filters (30) are amenable to printed circuit (microstrip to stripline) fabrication using superconductors for the conductive elements.

REFERENCES:
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patent: 4453146 (1984-06-01), Fiedziuszko
patent: 4489293 (1984-12-01), Fiedziuszko
patent: 4540955 (1985-09-01), Fiedziuszko
Zhuang et al., "Microstrip Disk Cavities Filter Using Gap Capacitance Coupling", IEEE MTT-S Digest, pp. 551-554 (1988).
Wolff, "Microstrip Bandpass Filter Using Degenerate Modes of a Microstrip Ring Resonator", Electronics Letters, vol. 8 No. 12, pp. 143-144 (1972).
Guglielmi, "Microstrip Ring-Resonator Dual-Mode Filters", distributed at the Workshop on Microwave Filters for Space Applications by ESA (European Space Agency)/ESTEC in Jun. 1991.
Fiedziuszko et al., "Miniature Dual Mode Microstrip Filters", IEEE MTT-S International Microwave Symposium Digest, vol. 2, pp. 443-446 (Jun. 1991).

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