Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-12-02
1994-11-15
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, H01L 4108
Patent
active
053651383
ABSTRACT:
A double mode surface wave resonator comprises two IDTs (inter-digital transducers), arranged side by side between reflection gratings, on a surface of a piezoelectric substrate to provide for coupling of surface waves therebetween, each IDT having interleaved electrodes extending from a common rail between the two IDTs and from a respective outer rail of the IDT. One or each of the IDTs and its outer rail is divided into two halves for providing a differential signal connection to the resonator. The electrodes of the IDTs can be arranged in spatial synchronism with adjacent fingers of the reflection gratings to reduce spurious longitudinal modes.
REFERENCES:
patent: Re33957 (1992-06-01), Nakazawa et al.
patent: 4542356 (1985-09-01), Nakazawa et al.
patent: 5223762 (1993-06-01), Masaie et al.
P. S. Cross et al., "Synchronous IDT SAW Resonators With Q Above 10,000", 1979 Ultrasonics Symposium, pp. 824-829, 1979.
M. Tanaka et al., "Narrow Bandpass Filter Using Double-Mode SAW Resonators On Quartz", 38th Annual Frequency Control Symposium, pp. 286-293, 1984.
T. Uno et al., "Optimization of Quartz SAW Resonator Structure With Groove Gratings", IEEE Trans. on Sonics and Ultrasonics, vol. SU-29, No. 6, pp. 299-310, Nov. 1982.
Cameron Thomas P.
Nisbet John J.
Saw John C. B.
Suthers Mark S.
Tiller Samuel A.
Budd Mark O.
Haley R. John
Northern Telecom Limited
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