An interdigital transducer (IDT), or interdigitated transducer, is a device which consists of two interlocking comb-shaped metallic coatings (in the fashion of a zipper) which are applied to a piezoelectric substrate, such as quartz or lithium niobate. IDTs are primarily used to convert microwaves to surface acoustic waves (SAW). ALSO see http://w...
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http://en.wikipedia.org/wiki/Interdigital_transducer
surface acoustic wave transducer made of a comb-like conductive structure deposited on faces of a piezoelectric substrate transforming electrical energy into acoustic energy or vice versa
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=561-06-09
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