Surface acoustic wave device and communication device employing

Details Surface acoustic wave device and communication device employing Surface acoustic wave device and communication device employing

1995-08-22

1999-05-18

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313R, 333186, H03H9/145

Patent

active

059053240

ABSTRACT:
A surface acoustic wave device makes it possible to increase the electrode width without generating mass-electrical-loading and is capable of operating in a high-frequency band higher than or equal to the UHF band, and this surface acoustic way device may be used in a communication device to eliminate need for any down-converter which is indispensable to the conventional high-frequency communication device, and which is therefore capable of being manufactured at a reduced cost. The surface acoustic wave device is provided with an electrode structure meeting conditions represented by: s+m=(2n+1)L/(4k), where L is electrode period, not taking into consideration the polarity of an interdigital transducer, m is electrode line width, s is minimum electrode gap width, and n and k are natural numbers. The surface acoustic wave device is used as the demodulator of the communication device.

REFERENCES:
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patent: 5084687 (1992-01-01), Vale et al.
patent: 5185548 (1993-02-01), Egara et al.
patent: 5185829 (1993-02-01), Yamada et al.
"SAW MSK Matched Filter and its Application", J. Tominaga et al, Faculty of Engineering, Tamagawa University, Machida, Japan 194, Electronics Communications in Japan, Part 2, vol. 69, No. 8, 1986.

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