Dual function reflector structures for interdigital saw transduc

Details Dual function reflector structures for interdigital saw transduc Dual function reflector structures for interdigital saw transduc

1992-05-13

1993-12-28

Lee, Benny

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333195, 310313B, 310313D, 29 2535, H03H 925

Patent

active

052743454

ABSTRACT:
A SAW reflector structure located between multiple interdigitated generator/receivers located on a piezo-electric substrate forming a ladder type SAW device is described. The reflector structure reduces both reflections due to mechanical-electrical loading from the physical presence of generator/receiver fingers without using a split finger arrangement as well as reflections due to the regenerated reflection from the generator/receiver. The reflector has a first acoustic phase center. The generator/receiver has a second acoustic phase center, a regenerated voltage coefficient of reflection, r.sub.e and a mechanical-electrical loading coefficient of reflection, r.sub.m. The reflector is used for simultaneously reflecting both regenerated and mechanical-electrical loading induced reflections from the generator/receiver. The reflector is sized for a strength of reflection equal to the square root of the sum of the regenerated and mechanical-electrical loading reflections squared. The reflector's phase center is positioned an integral number of acoustic half wavelengths from the phase center of the generator/receiver plus a distance equivalent to either plus or minus half the phase angle given by 90 degrees plus the inverse tangent of the ratio of the the mechanical-electrical loading reflection to the regenerated reflection.

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