SIMULATION OF PASSIVE WIRELESS SURFACE ACOUSTIC WAVE SENSOR USING FINITE ELEMENT METHOD COMBINED MODELING IN MATLAB/SIMULINK
Abstract
This study uses a combining of two types of software are Ansys and
Matlab/Simulink to completely simulate a passive wireless sensor of reflective
delay line one-port (SAW RDL). We use the interdigital transcuder (IDT) with a
bi-directional structure and three reflectors put on LiNbO3 substrate. In which,
the distance between IDT and the first reflector is 201m and equal to the
distance of the second and the third reflector, and the distance from the second
to the third reflector is 64.32m. The simulation results on Ansys as amplitude,
wavelength, and the time delay of reflected waves are used to build a model to
calculate the phase delay of reflected signal on Matlab/Simulink, from which we
calculate the tan trigonometric of the phase delay between the signal emitted
from the reader and the response waves.