View source for Interdigital transducer

{{More citations needed|date=December 2006}}

[[Image:SAW device.png|right|thumb|230px|Schematic picture of a typical SAW signal processing device containing two interdigital transducers.]]

An '''interdigital transducer''' (IDT) is a device that consists of two interlocking comb-shaped arrays of metallic electrodes (in the fashion of a zipper). These metallic electrodes are deposited on the surface of a [[piezoelectric]] [[Wafer (electronics)|substrate]], such as [[quartz]] or [[lithium niobate]], to form a periodic structure.<ref>[https://askanydifference.com/difference-between-active-and-passive-transducer/ Difference Between Active and Passive Transducer] Retrieved 13 February 2023.</ref>

==Function==
IDTs primary function is to convert electric signals to [[surface acoustic wave]]s (SAW) by generating periodically distributed mechanical forces via piezoelectric effect (an input transducer). 

The same principle is applied to the conversion of SAW back to electric signals (an output transducer). These processes of generation and reception of SAW can be used in different types of SAW signal processing devices, such as band pass filters, delay lines, resonators, sensors, etc. 

IDT was first proposed by [[Richard M. White]] and Voltmer in 1965. 
 
==References==
<references/>
{{refbegin}}
*{{cite book |first=B.A. |last=Auld |title=Acoustic fields and waves in solids |url=https://books.google.com/books?id=_2MWAwAAQBAJ&pg=PP1 |publisher=Krieger |isbn=978-0898747829 |year=1990 |edition=2nd}}
*{{cite book |first=H. |last=Matthews |title=Surface wave filters: design, construction, and use |publisher=Wiley |year=1977 |isbn=978-0471580300 |url=https://books.google.com/books?id=f4C_AAAAIAAJ}}
*{{cite book |first=V.M. |last=Ristic |title=Principles of Acoustic Devices |publisher=Wiley |year=1983 |isbn=978-0471091530 |url=https://books.google.com/books?id=pAJTAAAAMAAJ |edition=2nd}}
*{{cite book |first=S. |last=Datta |title=Surface Acoustic Wave Devices |publisher=Prentice-Hall |year=1986 |isbn=978-0138779115 |url=https://books.google.com/books?id=ng9TAAAAMAAJ}}
{{refend}}

==Further reading==
*{{cite journal |first1=R.M. |last1=White |first2=F.M. |last2=Voltmer |title=Direct piezoelectric coupling to surface elastic waves |journal=Appl. Phys. Lett. |volume=7 |issue=12 |pages=314–6 |year=1965 |doi=10.1063/1.1754276 |bibcode=1965ApPhL...7..314W }}
*{{cite journal |first1=A.V. |last1=Mamishev |first2=K. |last2=Sundara-Rajan |first3=F. |last3=Yang |first4=Y. |last4=Du |first5=M. |last5=Zahn |title=Interdigital sensors and transducers |journal=Proceedings of the IEEE |volume=92 |issue=5 |pages=808–845 |year=2004 |doi=10.1109/JPROC.2004.826603 |citeseerx=10.1.1.473.5989 |s2cid=159431 |url=http://www.ee.washington.edu/research/seal/pubfiles/2004808805.pdf }}
*{{cite journal |first1=R. |last1=Igreja |first2=C.J. |last2=Dias |title=Analytical evaluation of the interdigital electrodes capacitance for a multi-layered structure |journal=Sensors and Actuators A: Physical |volume=112 |issue=2–3 |pages=291–301 |year=2004 |doi=10.1016/j.sna.2004.01.040 }}

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[[Category:Acoustics]]
[[Category:Transducers]]
[[Category:Microtechnology]]

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