Related Experiment Video
Updated: Jun 5, 2026

Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Modeling electrical response of polymer-coated SAW resonators by equivalent circuit representation
Roshan Kshetrimayum1, R D S Yadava, R P Tandon
1Department of Physics and Astrophysics, University of Delhi, Delhi 110 007, India. rosksh@gmail.com
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.
Related Concept Videos
Types of Responses of Series RLC Circuits
Series RLC Circuit without Source
Design Example: Underdamped Parallel RLC Circuit
Starting with a fixed...
Characteristics of Series Resonant Circuit
Parallel RLC Circuits
A simplified parallel RLC circuit model with a DC input source generating a step response is employed in this context. When the switch is turned on, Kirchhoff's current law is applied, leading to a second-order differential equation.
RLC Circuit as a Damped Oscillator
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...

