Three-transducer saw device including one or two apodized transd

Details Three-transducer saw device including one or two apodized transd Three-transducer saw device including one or two apodized transd

1988-09-26

1990-03-20

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313D, H01L 4108

Patent

active

049104268

ABSTRACT:
In a three-transducer surface acoustic wave device, an apodized electrode member is interposed between two interdigital electrode members, each having first and second ends and comprising interdigital electrodes between the first and the second ends either with a uniform density distribution or with a density distribution varied according to a prescribed rule of selective withdrawal of the interdigital electrodes. The apodized electrode member has first and second extremities and is given substantially minimum-phase and maximum-phase impulse responses for surface acoustic waves which are propagated either into or out of the apodized electrode member through one and the other of the extremities. Alternatively, an interdigital electrode member is interposed between two apodized electrode members. Each of the interdigital and the apodized electrode members is of the type described above. One of the apodized electrode member should have a substantially minimum-phase impulse response. The other should have a substantially maximum-phase impulse response.

REFERENCES:
patent: 4025880 (1977-05-01), Coussot
patent: 4044321 (1977-08-01), Vasile
patent: 4047130 (1977-09-01), Lim et al.
patent: 4066985 (1978-01-01), Kuny
patent: 4346322 (1982-08-01), Sato et al.
patent: 4513261 (1985-04-01), Yen et al.
patent: 4634913 (1987-01-01), Whatmore et al.

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