Surface acoustic wave band pass filtering

Details Surface acoustic wave band pass filtering Surface acoustic wave band pass filtering

1976-03-01

1977-08-23

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310313, 310366, 333 30R, H03H 904, H03H 926, H03H 932, H03H 930

Patent

active

040443213

ABSTRACT:
Two piezoelectric filters are cascaded for suppression of bulk waves while mutually reinforcing surface wave band pass filtering. Each filter has an apodized central transducer and two outer transducers. In one instance the two outer transducers on one filter differ from the two outer transducers of the other filter with regard to bulk wave generation and reception. In another instance one filter provides asymmetric transmission and symmetry is restored by a wave slow-down for surface waves only. In still another instance the slow-down pad is provided also, but the signals in the two outer transducers are electrically inverted.

REFERENCES:
patent: 3559115 (1971-01-01), De Vries
patent: 3659231 (1972-04-01), De Vries
patent: 3908137 (1976-09-01), Hunsinger et al.
patent: 3936774 (1976-02-01), Mellon et al.
patent: 3956647 (1976-05-01), Mitchell et al.
patent: 3972011 (1976-07-01), Coussot et al.

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