Surface acoustic wave filter utilizing direction changing electr

Details Surface acoustic wave filter utilizing direction changing electr Surface acoustic wave filter utilizing direction changing electr

1998-10-14

2000-09-05

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, H03H 964

Patent

active

061149276

ABSTRACT:
A surface acoustic wave filter includes a piezoelectric substrate, input and output IDTs, and first and second direction changing electrodes, wherein at least one of the input and output IDTs includes a weighted interdigital transducer, the input and output IDTS being arranged in a direction perpendicular to a propagation direction of a surface acoustic wave (SAW) oscillated by the input IDT. The first direction changing electrode changes the propagation direction of the SAW, which has propagated in a left directed from the input IDT, into a direction towards the output IDT. The second direction changing electrode changes the propagation direction of the SAW, which has propagated in a right direction from the input IDT, into a direction towards the output IDTs and the first and second direction changing electrodes is set for obtaining at the output IDT the SAW having desired frequency characteristics.

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patent: 4727275 (1988-02-01), Milsom
patent: 5365206 (1994-11-01), Machui et al.

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