Surface acoustic wave (SAW) filter with improved spacing between

Wave transmission lines and networks – Coupling networks – Electromechanical filter

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333193, 310313D, H03H 964

Patent

active

057173672

ABSTRACT:
A SAW filter is disclosed which includes two reflectors and a group of interdigital transducers (IDTs) located therebetween on a piezoelectric substrate, wherein the IDTs comprises at least four input IDTs and output IDTs alternatively aligned on the substrate in a SAW propagation direction to increase an transducer efficiency between an electronic signal and SAWs. Further, a distance between the center lines of the end electrode fingers of the adjacent input and output IDTs are set to be in a range from 0.625 .lambda. to 1.25 .lambda. (.lambda.: wave length of SAW) to establish input and output impedances of the SAW filter.

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