Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

1995-12-06

1996-12-17

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 310313D, H01L 4108

Patent

active

055856845

ABSTRACT:
A surface acoustic wave device comprises, on a lithium tetraborate substrate 10, a central interdigital transducer 21, 31, and first and second interdigital transducers 22, 23, 32, 33 disposed adjacently on both sides of the central interdigital transducer 21, 31 in a propagation direction of surface acoustic waves, or comprises a first such row of transducers 20 and a second such row of transducers 30 connected in cascade to each other. A sum Nc+Ns of a number of the central interdigital transducer pairs Nc, and a total number of the first and second interdigital transducers pairs Ns is set at a suitable range. The surface acoustic wave device has flat group delay times, relatively wide specific band widths, small insertion losses and large attenuation outside the pass band.

REFERENCES:
patent: 4672255 (1987-06-01), Suzuki et al.
patent: 5302877 (1994-04-01), Sato et al.
patent: 5434465 (1995-07-01), Sato et al.
"SAW Resonator and Resonator Filter On Li.sub.2 B.sub.4 O.sub.7 Substrate", Yasuo Ebata, et al., Proceedings of 7th Symposium and Ultrasonic Electronics, Kyoto 1986, 2419 Japanese Journal of Applied Physics/Supplement 26 (1987) Suppl. 26-1, Tokyo, Japan.

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