Unidirectional surface acoustic wave transducer

Details Unidirectional surface acoustic wave transducer Unidirectional surface acoustic wave transducer

1992-11-09

1994-02-22

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333193, 333196, H01L 4108

Patent

active

052890732

ABSTRACT:
A low-loss, wideband SAW transducer operating on a piezoelectric substrate with a longitudinal axis of propagation. The SAW transducer has a plurality of tapered interdigital electrodes that are mounted on the substrate transverse to the propagation axis. The electrode widths and spacings are constant along lines parallel to the axis and are tapered in the direction transverse to the axis. An acoustic-wave reflector having a plurality of elongated, tapered discontinuities or reflective fingers is located on the substrate adjacent one end of the transducer. The spacings and widths of the reflective fingers are similar to those of the electrodes, i.e., the finger widths and spacings are tapered in the direction transverse to the axis and are constant along lines parallel to the axis. Because of the taper, the fingers reflect wideband acoustic waves parallel to the axis.

REFERENCES:
patent: 4600905 (1986-07-01), Fredricksen
patent: 4635008 (1987-01-01), Solie
patent: 4746882 (1988-05-01), Solie
patent: 4878036 (1989-10-01), Yatsuda et al.
patent: 4908542 (1990-03-01), Solie
patent: 4973875 (1990-11-01), Yatsuda
patent: 5075652 (1991-12-01), Sugai
A. P. van den Heuvel, "Properties of Tapered Surface Wave Transducers," E Research and Development Technical Report, Technical Report ECOM-0197-F, pp. 12-14, 18, 19, 22-25, Feb. 1973.

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