Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1981-09-21
1983-10-11
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313A, 333193, H03H 964, H03H 9145
Patent
active
044095716
ABSTRACT:
Surface acoustic wave bandpass transversal filters, e.g. television intermediate frequency filters, comprising a +.theta..degree. rotated Y-cut X-propagating lithium niobate substrate with .theta. in the range from 121.degree. to 127.degree., preferably 123.degree. to 125.degree.. For a suitable range of filter bandwidths (35 db bandwidth between 0.05 and 0.5) these substrates provide reduced degradation of the filter upper stopband predominantly due to indirect bulk shear waves in the frequency range from the passband up to the frequency where direct bulk longitudinal wave degradation becomes significant. This frequency range is 41.5 MHz to approximately 55 MHz for a U.K. system t.v. i.f. filter and is 60.25 MHz to approximately 90 MHz for a Japanese system t.v. i.f. filter.
REFERENCES:
patent: 3956646 (1976-05-01), Shibayama et al.
patent: 4016440 (1977-04-01), Wagers
Flinn Ian
Milsom Robert F.
Murray Robert J.
Franzblau Bernard
Mayer Robert T.
Nussbaum Marvin L.
U.S. Philips Corporation
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