Surface wave resonator having single component including a plura

Details Surface wave resonator having single component including a plura Surface wave resonator having single component including a plura

1997-04-22

1998-08-11

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 310313D, 310320, H03H 925

Patent

active

057931470

ABSTRACT:
An end face reflection type surface wave resonator utilizing SH type surface waves capable of providing a plurality of resonance characteristics is formed as a single element. In the surface wave resonator, surface waves are reflected between two opposite end faces of a piezoelectric substrate. The surface wave resonator has IDTs that form first and second resonant units. The distance L between the two end faces is selected to be within a range expressed by (.lambda..sub.1 /2).times.N.sub.1 .+-.(.lambda..sub.1 /20) (N.sub.1 is an integral number) where .lambda.1 represents the wavelength of a surface wave excited by the first resonant unit. The distance L is chosen to be out of a range expressed by (.lambda..sub.2 /2).times.N.sub.2 .+-.(.lambda..sub.1 /20) (N.sub.2 is an integral number) where .lambda..sub.2 represents the wavelength of a surface wave excited by the second resonant unit.

REFERENCES:
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patent: 5010269 (1991-04-01), Hikita et al.
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patent: 5235235 (1993-08-01), Martin et al.
Patent Abstracts of Japn, vol. 16, No. 312 (E-1230), Jul. 9, 1992, JP-4 87 410 A (Murata Mfg.).
"Kokusai Gihou", International Electronic Technology Bulletin, No. 16, pp. 1-7, 1992.

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