Interdigitaltransducer

An interdigital transducer ( IDT short ) (Latin: inter = between; Latin: digitus = finger; Latin: trans = across, over; Latin: ducere = lead, lead ) is a transducer, which has finger-like structures, such as tines of two combs look, and the mesh without touching.

The finger-like structures are usually made ​​of metal and arranged on a piezoelectric substrate. A voltage is applied between the combs, as generated between these two tines, a change in length of the substrate. When an alternating voltage is applied, the surface waves are generated which propagate on the substrate. Another interdigital these waves can turn them into an AC voltage.

Can be used such an arrangement, for example, as a bandpass filter in the RF technology and as a pump in microfluidics.

  • Filter ( Electrical Engineering)
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