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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://www.ee.washington.edu/research/seal/pubfiles/2004808805.pdf for more detailed information.
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