Wave transmission lines and networks – Coupling networks – Delay lines including elastic surface wave propagation means
Patent
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.
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patent: 3893047 (1975-07-01), Lardat
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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.
Kitano Toshihiko
Watanabe Takaya
LaRoche Eugene R.
Lee Benny
NEC Corporation
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