Surface wave resonator

Details Surface wave resonator Surface wave resonator

1996-08-30

1999-06-22

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333193, H01L 4108

Patent

active

059145544

ABSTRACT:
An end-face reflecting-type surface wave resonator using the SH-type surface wave achieves two types of resonance characteristics by use of only a single device. An interdigital transducer having a pair of comb-like electrodes are formed on a piezoelectric substrate having two oppositely-facing end faces. The interdigital transducer has two peaks of main lobes and are assigned with weights so that the two peaks of main lobes substantially coincide with frequency positions of attenuation poles disposed across a main lobe of a virtual normal-type interdigital transducer having the same number of pairs of electrodes as the weighted interdigital transducer. Thus, two types of resonance characteristics can be obtained.

REFERENCES:
patent: 3252017 (1966-05-01), Bartels
patent: 3523200 (1970-08-01), Newell
patent: 4016440 (1977-04-01), Wagers
patent: 5260913 (1993-11-01), Kadota et al.
patent: 5550793 (1996-08-01), Dufilie
patent: 5684437 (1997-11-01), Ago et al.
patent: 5705964 (1998-01-01), Tera et al.
patent: 5714830 (1998-02-01), Kadota et al.
patent: 5793147 (1998-08-01), Kadota et al.
M. Kadota, "BGS Wave Resonators Adopt Ceramic Substrate, Realize Low Cost", JEE Journal of Electronic Engineering, vol. 32, No. 337, pp. 33-36, Jan. 1, 1995.
Patent Abstracts of Japan, vol. 017, No. 599 (E-1455), Nov. 2, 1993 & JP-A-05 183376, Jul. 23, 1993.

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