Abstract：
:The paper presents an equivalent circuit model of the polymer coated surface acoustic wave (SAW) resonators by combining coupling-of-mode (COM) description of SAW resonators and perturbation calculation of SAW propagation under polymer loading. An expression for the motional load produced by polymer coating is deduced in terms of COM parameters and polymer characteristics. In addition, expressions for the shifts in resonance frequency and attenuation due to polymer loading are obtained. Simulation results are presented for one-port and two-port resonator devices coated with viscoelastic thin polymer film. The influence of polymer film on resonator response is studied with regard to variations in film thickness and shear modulus. The model simplifies understanding of polymer-coated SAW sensors.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Kshetrimayum R,Yadava RD,Tandon RPdoi
10.1016/j.ultras.2010.12.006subject
Has Abstractpub_date
2011-07-01 00:00:00pages
547-53issue
5eissn
0041-624Xissn
1874-9968pii
S0041-624X(10)00192-7journal_volume
51pub_type
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