Apparatus for suppression of spurious attenuation poles in cryst

Wave transmission lines and networks – Coupling networks – Electromechanical filter

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333189, 310366, H03H 956, H03H 958, H03H 905

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045338850

ABSTRACT:
Piezoelectric filter includes a piezoelectric substrate having an upper and lower opposed major surfaces. A plurality of N coupled resonators where N is an integer greater than two exposed on the surface of the substrate. A plurality of mounting pedestals are utilized to couple the resonators to ground in a manner such that no two non-adjacent resonators are coupled to any one pedestal. This mounting scheme suppresses undesired spurious attenuation poles and improves the selectivity of the piezoelectric filter.

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patent: 4282454 (1981-08-01), Wakat, Jr. et al.
patent: 4329666 (1982-05-01), Arvanitis
patent: 4334343 (1982-06-01), Wakat, Jr. et al.
patent: 4430596 (1984-02-01), Shanley
U.S. Ser. No. 408,409, Charles Shanley, filed 8/16/82.
U.S. Ser. No. 336,475, Higgins, filed 12/31/81.
Transactions on Microwave Theory and Techniques, vol. MTT-18, No. 12, "A Four-Cavity Elliptic Waveguide Filter", Albert E. Williams, Dec. 1970; pp. 1109-1114.

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