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Correlation between landa and IDTs dimetions for SAW devices?

Interdigital transducer

Parasitic capacitance

Surface acoustic wave sensor

Capacitive sensing

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The dimensions of the interdigital transducers (IDTs) in surface acoustic wave (SAW) devices have a correlation with the wavelength (lambda) of the SAW being propagated. The IDTs can be arranged in various configurations to achieve specific performance characteristics. For example, using IDTs with successively decreasing length and lambda/4 pitch can substantially eliminate SAW reflections at the back edge of the IDT . Additionally, increasing the number of SAW IDTs can result in a higher center frequency and improved sensitivity . In a tapped delay line SAW device, the pitch between consecutive IDTs is an integral multiple of lambda/2 to avoid reflections and maintain a constant finger periodicity . The dimensions of the IDTs, along with the materials used, play a crucial role in achieving stable performance at high temperatures in harsh environments .

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Proceedings Article•DOI Capacitively coupled IDT for high temperature SAW devices S. C. Moulzolf, R. Behanan, T.B. Pollard, Robert J. Lad, M. Pereira da Cunha - Show less +4 more 21 Jul 2013 15 Citations	The provided paper does not mention any correlation between the dimensions of langasite (LGS) and interdigital transducers (IDTs) for SAW devices.
Patent Saw device tapped delay lines Thomas Cameron, Paul Kennard, J.C.B. Saw, Mark Spencer Suthers - Show less +3 more 17 Dec 1991 9 Citations	The paper does not provide information about the correlation between lambda (λ) and the dimensions of the IDTs for SAW devices.
Patent Interdigital transducer arrangements for surface acoustic wave devices Manjunath Swamy 10 Oct 2018	The provided paper does not mention any correlation between the dimensions of IDTs and the wavelength (lambda) for SAW devices.
Patent Saw devices with reflection-suppressing fingers Mark Spencer Suthers, Este Grantley Oliver, Richard W. Streater, Blair K. MacLaurin - Show less +3 more 21 Feb 1986 8 Citations	The paper does not provide information about the correlation between lambda (wavelength) and the dimensions of the IDTs for SAW devices.
Open access Design and Fabrication of IDT SAW by Using Conventional Lithography Technique Uda Hashim, R. Mat Ayub, Tijjani Adam - Show less +2 more 01 Jan 2013 9 Citations	The provided paper does not mention any correlation between the wavelength (landa) and the dimensions of IDTs for SAW devices.

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