Surface acoustic wave filters

Details Surface acoustic wave filters Surface acoustic wave filters

H - Electricity

01

P

333/58

H01P 1/20 (2006.01) H03H 9/02 (2006.01) H03H 9/64 (2006.01)

Patent

CA 1169505

PHB.32.727 23 ABSTRACT: Surface acoustic wave bandpass transversal filters, e.g. television intermediate frequency filters, comprising a +.THETA.° rotated Y-cut X-propagating lithium niobate substrate with .THETA. in the range 121° to 127°, preferably 123° to 125°. 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 where direct bulk longitudinal wave degradation becomes significant. This frequency range is 41.5 MHz to approx- imately 55 MHz for a U.K. system t.v. i.f. filter and 60.25 MHz to approximately 90 MHz for a Japanese system t.v. i.f. filter.

387120

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