Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

1980-09-25

1982-07-27

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333153, 333193, 333195, H03H 925, H03H 942, H03H 964, H03H 966

Patent

active

043420117

ABSTRACT:
A surface acoustic wave device comprising a piezoelectric substrate, an input transducer and an output transducer arranged diagonally to each other. A multistrip coupler is interposed between the input and output transducers. A reflecting transducer is placed opposite to the input transducer with the multistrip coupler therebetween. The multistrip coupler includes an adjusted number of conductors. The reflecting transducer includes weighted electrodes, and means for adjusting phase difference, whereby the surface acoustic waves reflected by the output transducer and the reflecting transducer are cancelled by each other. Accordingly, triple transit echo (TTE) can be suppressed without use of external variable resistors and inductors.

REFERENCES:
patent: 3596211 (1971-07-01), Dias et al.
patent: 3662293 (1972-05-01), De Vries
patent: 4060833 (1977-11-01), Onyshkevych
patent: 4146851 (1979-03-01), Dempsey et al.
Marshall-"New Technique for the Suppression of Triple-Transit Signals in Surface-Acoustic-Wave Delay Lines, Electronics Letters", vol. 8, No. 12, Jun. 15, 1972, pp. 311-312.

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