Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1983-04-27
1985-08-06
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333189, 310366, H03H 956, H03H 958, H03H 905
Patent
active
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.
REFERENCES:
patent: 3453458 (1969-07-01), Curran et al.
patent: 3609601 (1971-09-01), Phillips et al.
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.
Downey Joseph T.
Motorola Inc.
Nussbaum Marvin L.
Roney Edward M.
Southard Donald B.
LandOfFree
Apparatus for suppression of spurious attenuation poles in cryst does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for suppression of spurious attenuation poles in cryst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for suppression of spurious attenuation poles in cryst will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-514839