Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1996-02-02
1998-02-10
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
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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Gambino Darius
Mitsubishi Denki & Kabushiki Kaisha
Pascal Robert
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