Multichannel surface acoustic wave encoder/decoder

Details Multichannel surface acoustic wave encoder/decoder Multichannel surface acoustic wave encoder/decoder

1986-12-30

1988-08-16

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 310313R, 310313D, 333151, 333194, H01L 4108

Patent

active

047647019

ABSTRACT:
A multichannel surface acoustic wave encoder/decoder having a common electrical input is designed so that the insertion losses of the channels differ despite the apparent design constraint of closely matched channel output impedances. The input transducing device or SAW transmitter is divided into individual transducers (or into subtransducers) having different numbers of finger overlaps, thus achieving different acoustic output levels which in turn result in different insertion losses for different channels. The finger spacing of the SAW transmitters can differ between the respective input transducers or subtransducers so as to optimize the center frequency of each channel.

REFERENCES:
patent: 3803395 (1974-04-01), Quate
patent: 3810257 (1974-05-01), Jones et al.
patent: 3898592 (1975-08-01), Solie
patent: 3983517 (1976-09-01), Weglein
patent: 4405874 (1983-09-01), Suthers
patent: 4434383 (1984-02-01), Cho et al.
patent: 4499393 (1985-02-01), Stokes et al.
patent: 4539502 (1985-09-01), Este et al.
patent: 4625208 (1986-11-01), Skeie et al.
patent: 4697115 (1987-09-01), Mitsutsuka

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