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Sensors 2008, 8(12), 7917-7929; doi:10.3390/s8127917

A Love Wave Reflective Delay Line with Polymer Guiding Layer for Wireless Sensor Application

Institute of Acoustics, Chinese Academy of Science, Beijing, 100190, P.R. China
Author to whom correspondence should be addressed.
Received: 12 October 2008 / Revised: 21 November 2008 / Accepted: 3 December 2008 / Published: 5 December 2008
(This article belongs to the Section Chemical Sensors)
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This paper presents an optimal design for a Love wave reflective delay line on 41o YX LiNbO3 with a polymer guiding layer for wireless sensor applications. A theoretical model was established to describe the Love wave propagation along the larger piezoelectric substrate with polymer waveguide, and the lossy mechanism from the viscoelastic waveguide was discussed, which results in the optimal guiding layer thickness. Coupling of modes (COM) was used to determine the optimal design parameters of the reflective delay line structured by single phase unidirectional transducers (SPUDTs) and shorted grating reflectors. Using the network analyzer, the fabricated Love wave reflective delay line was characterized, high signal noise ratio (S/N), sharp reflection peaks, and few spurious noise between the peaks were found, and the measured result agrees well with the simulated one. Also, the optimal guiding layer thickness of 1.5~1.8μm was extracted experimentally, and it is consistent with the theoretical analysis. View Full-Text
Keywords: Reflective delay line; Love wave; PMMA; 41° YX LiNbO3; COM Reflective delay line; Love wave; PMMA; 41° YX LiNbO3; COM

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Wang, W.; He, S. A Love Wave Reflective Delay Line with Polymer Guiding Layer for Wireless Sensor Application. Sensors 2008, 8, 7917-7929.

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