Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1980-08-11
1982-05-11
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310320, 310366, 333189, H03H 956, H03H 915
Patent
active
043296661
ABSTRACT:
A two-pole monolithic crystal filter is described that includes grounded strip electrodes between input and output electrodes. The grounded strip electrodes have a higher resonating frequency than the input and output electrodes and also provide increased acoustical coupling and lower inter-electrode capacitance between the input and output electrodes, while having little or no effect on the midband electrical characteristics of the filter. Because of the increased coupling, the input and output electrodes can be spaced further apart than heretofore possible in prior monolithic crystal filters. Moreover, further increases in the acoustical coupling can be achieved by arranging a plurality of strip electrodes between the input and output electrodes. The inventive monolithic crystal filter can be advantageously utilized for filtering the IF signal developed in the IF portion of an FM radio receiver.
REFERENCES:
patent: 2323610 (1943-07-01), Koch
patent: 3517350 (1970-06-01), Beaver
patent: 3564463 (1971-02-01), Beaver et al.
patent: 3573672 (1971-04-01), Fair et al.
patent: 3576506 (1971-04-01), Reynolds et al.
patent: 3599124 (1971-08-01), Smith et al.
patent: 3609601 (1971-09-01), Phillips et al.
patent: 3727154 (1973-04-01), Dailing et al.
patent: 3898489 (1975-08-01), Grady et al.
patent: 4013982 (1977-03-01), Wood et al.
patent: 4156214 (1979-05-01), Arvanitis et al.
patent: 4163959 (1979-08-01), Dailing
Beaver-"Theory and Design Principles of the Monolithic Crystal Filter", Ph. D. Dissertation, Lehigh University, 1967; pp. i, iv-xx and 1-50.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Nussbaum Marvin L.
LandOfFree
Two-pole monolithic crystal filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two-pole monolithic crystal filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-pole monolithic crystal filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-759114