Surface acoustic wave dispersive delay lines having a laser irri

Details Surface acoustic wave dispersive delay lines having a laser irri Surface acoustic wave dispersive delay lines having a laser irri

1984-01-27

1986-11-18

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333195, 310313D, H03H 944

Patent

active

046238530

ABSTRACT:
In a surface acoustic wave dispersive delay line of the type comprising a substrate made of piezoelectric material along which surface acoustic wave propagates, an input transducer formed on the substrate for producing the surface acoustic wave in response to an input electric signal, a first reflector including a plurality of reflection gatings formed at different spacings on the substrate for reflecting the surface acoustic wave from the input transducer, a second reflector including a plurality of reflection gratings formed at different spacings on the substrate for reflecting the surface acoustic wave reflected by the first reflector, an output transducer for converting the surface acoustic wave reflected by the second reflector into an electric signal, there is provided a device for eliminating concentration of the surface acoustic wave formed by the first and second reflectors. The concentration eliminating device comprises a coating of a conductive composition or a silicon rubber applied on a focus at which the surface wave concentrates or is formed by irradiating the focus with a laser beam.

REFERENCES:
patent: 3697899 (1972-10-01), Dias
patent: 3818379 (1974-06-01), Wauk, II
patent: 3883831 (1975-05-01), Williamson et al.
patent: 3893047 (1975-07-01), Lardat
patent: 3938881 (1976-02-01), Biegelsen et al.
patent: 3975697 (1976-08-01), Paige
patent: 4047130 (1977-09-01), Lim et al.
Anderson A. C. et al, "Attenuating Thin Films for SAW Device" 1980 Ultrasonic Synposian Proceeding; Boston, Mass.; Nov. 5-7, 1980 pp. 442-443.

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