Abstract
An accurate and fast simulation tool plays an important role in the design of wireless passive impedance-loaded surface acoustic wave (SAW) sensors which have received much attention recently. This paper presents a finite transducer analysis method for wireless passive impedance-loaded SAW sensors. The finite transducer analysis method uses a numerically combined finite element method-boundary element method (FEM/BEM) model to analyze non-periodic transducers. In non-periodic transducers, FEM/BEM was the most accurate analysis method until now, however this method consumes central processing unit (CPU) time. This paper presents a faster algorithm to calculate the bulk wave part of the equation coefficient which usually requires a long time. A complete non-periodic FEM/BEM model of the impedance sensors was constructed. Modifications were made to the final equations in the FEM/BEM model to adjust for the impedance variation of the sensors. Compared with the conventional method, the proposed method reduces the computation time efficiently while maintaining the same high degree of accuracy. Simulations and their comparisons with experimental results for test devices are shown to prove the effectiveness of the analysis method.
Highlights
Wireless passive surface acoustic wave sensors have been investigated since the 1990s because they have several advantages, such as, no need for power supply, good environmental durability, high sensitivity, etc. [1]
Model for radio frequency (RF) devices because it includes most of the second order effects, but it model for radio frequency (RF) devices because it includes most of the second order effects, but it requires more computing time
A fast algorithm was introduced to calculate the coefficients of the system equations
Summary
Wireless passive surface acoustic wave sensors have been investigated since the 1990s because they have several advantages, such as, no need for power supply, good environmental durability, high sensitivity, etc. [1]. The non-periodic FEM/BEM model is more accurate than the COM model for radio frequency (RF) devices because it includes most of the second order effects, but it model for radio frequency (RF) devices because it includes most of the second order effects, but it requires more computing time In this model, calculating the coefficients of the system equations, requires more computing time. Our new algorithm leads to a half reduction in required computation This case was carefully considered and the whole numerical properties in the local area non-periodic model is applied impedance-loaded. A fast algorithm was introduced to calculate the coefficients of the system equations It was shown obtained anymodification external loaded impedance by model, using the theory after that, afterat some to the non-periodic the network sensor admittance canperforming be obtainedthe at calculation for only two states: Short circuit and open circuit.
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