Optimization of frequency characteristics for SAW device using apodization weighting method

Abstract

In this paper, the positive influence of apodization weighting method on frequency characteristics of surface acoustic wave (SAW) temperature sensor is investigated. Simulation and experiment results show that side lobe suppression abilities of the sensor can be improved by using apodization weighting which is based on Chebyshev window. Meanwhile, we find that the side lobe of the sensor can be further restrained, when the dummy electrodes are removed. Frequency-temperature characteristics of the devices are independent of the inclusion of dummy electrodes. The apodization weighted SAW temperature sensor shows great application potential in occasions with strong electromagnetic interference.

Keywords

Temperature Sensor / Surface Acoustic Wave / Window Function / Side Lobe / Rectangular Window

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This work has been supported by the National Natural Science Foundation of China (Nos.61274113, 61404091 and 11204212), the Program for New Century Excellent Talents in University (No.NCET-11-1064), the Tianjin Natural Science Foundation (Nos.13JCYBJC15700, 13JCZDJC26100 and 14JCZDJC31500), and the Tianjin Science and Technology Developmental Funds of Universities and Colleges (Nos.20100703, 20130701 and20130702).