Efficient surface acoustic wave device capable of excitation in

Details Efficient surface acoustic wave device capable of excitation in Efficient surface acoustic wave device capable of excitation in

1994-05-31

1995-12-19

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 310313D, 364821, H03H 9145

Patent

active

054770980

ABSTRACT:
A surface acoustic wave device includes a piezoelectric substrate, a wave guide path provided on the piezoelectric substrate and an interdigital transducer for exciting a surface acoustic wave. The interdigital transducer is provided with plural portions of mutually different pitches of the electrode finger, respectively corresponding to different frequencies. The portions are parallelly arranged along a direction perpendicular to the propagation direction of the surface acoustic wave. The surface acoustic wave generated by the interdigital transducer is entered in concentrated manner into the wave guide path.

REFERENCES:
patent: 4028649 (1977-06-01), Komatsu et al.
patent: 4649509 (1987-03-01), Engan
patent: 4841470 (1989-06-01), Okamoto et al.
patent: 5003213 (1991-03-01), Mochuzuki et al.
patent: 5185548 (1993-02-01), Egara et al.
patent: 5189330 (1993-02-01), Niitsuma
patent: 5336957 (1994-08-01), Yamanouchi et al.
Shibayama, "Application of Surface Acoustic Wave", Television, 30, pp. 457-463 (Jun. 1976) (and pertinent English translation).
Nikkan Kogyo Shimbun, "Surface Acoustic Wave Device and its Application", edited by Electronic Material Industry Association, pp. 165-167 (and pertienent English translation).

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