title: Sampling effect of distributed reflector arrays within a single-phase unidirectional SAW transducer.
abstract: A noteworthy feature of the group-type single-phase unidirectional transducer is that it can permit wideband low-loss surface-acoustic-wave (SAW) comb filter operation. This is shown to be due to the sampling imposed by the distributed reflector gratings. The capability is illustrated theoretically and experimentally for a 65-MHz comb filter on 128 degrees Y-X lithium niobate, with 5 comb modes of 585-kHz bandwidth each, together with 2.6-dB minimum insertion loss and overall 50% fractional bandwidth.
authors.affiliation: Bell Northern Res. Ltd., Ottawa, Ont.
authors.forename: C B
authors.initials: CB
authors.lastname: Saw
authors.forename: C K
authors.initials: CK
authors.lastname: Campbell