Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

1980-07-03

1981-12-22

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333154, 333195, H03H 925, H03H 942, H03H 964

Patent

active

043073565

ABSTRACT:
A surface acoustic wave device includes a piezoelectric substrate and a transmitting, a receiving and a reflecting transducer disposed thereon in a row along a predetermined path. The transmitting transducer is responsive to an input signal having a predetermined center frequency for propagating a first surface acoustic wave along the predetermined path. The receiving transducer is located at a location spaced a predetermined distance from the transmitting transducer and is adapted to convert the first acoustic wave to an electrical output signal, but also generates an undesired reflected wave. The reflecting transducer is provided close to one of the other two above-described transducers and is responsive to the first surface acoustic wave to generate a cancellation reflected wave which cancels the undesired reflected wave.

REFERENCES:
patent: 3596211 (1971-07-01), Dias et al.
patent: 4060833 (1977-11-01), Onyshkevych

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