Shear transverse wave device having selective trapping of wave e

Details Shear transverse wave device having selective trapping of wave e Shear transverse wave device having selective trapping of wave e

1992-03-02

1993-06-15

Stephan, Steven L.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, H01L 4108

Patent

active

052202348

ABSTRACT:
A shear transverse wave device having transitions in the relaxation or tightening of wave trapping. Two embodiments are preferably utilized simultaneously. A first embodiment involves wave trapping fingers disposed within a propagation region between a transmitting and a receiving interdigital transducer. The wave trapping fingers provide a high width-to-spacing ratio of fingers proximate to the transducers and provide a lower ratio with approach to a center of the propagation region. The relaxed trapping reduces the adverse effects caused by surface perturbations, while the tight trapping at the transducers provides an efficient coupling of power to and from the device. The second embodiment is likewise concerned with decoupling of power. Absorptive film is placed at the opposed edges of the device to suppress spurious reflections from the edges. A grating of fingers between each transducer and the associated edge is designed to provide a tightening of trapping with departure from the transducers, thereby allowing a more efficient absorption by the absorptive film, which is deposited on the fingers closest to the opposed edges. Again, the width-to-spacing ratio is varied to achieve the increase in wave trapping.

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B. A. Auld et al., "Temperature Compensation of Surface Transverse Waves for Stable Oscillator Application," presented at IEEE Ultrasonics Symposium, Oct. 1987.
D. F. Thompson, "Temperature Compensation of Microwave Acoustic Resonators," doctoral dissertation for Stanford University, Jun. 1986.

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