基于声表面波反射延迟线无线传感器的理论分析与设计(英文)  

Theoretical analysis and design of wireless surface acoustic wave sensor based on reflective delay line

作　　者：徐方迁[1] 王艳清[1] 王文[2] 

机构地区：[1]浙江传媒学院,杭州310018 [2]中国科学院声学所,北京100190

出　　处：《南京大学学报（自然科学版）》2013年第1期46-51,共6页Journal of Nanjing University（Natural Science）

基　　金：National Nature Science Foundation of China(10974171);Zhe jiang Province Nature Science Foundation(LY12A04003)

摘　　要：给出了一个新的关于声表面波反射延迟线理论分析方法,基于波动方程和Chen-Haus理论、利用变分方法研究了压电基底上金属短路栅阵中声表面波传输特性,得到其精确反射系数.之后,实验研制了一个用41°YXLiNbO3、单相单向换能器和三个短路反射栅构成的434MHz声表面波反射延迟线,测量值与理论分析基本一致,器件具有尖锐反射峰、高信噪比等特性.This paper presents a theoretical analysis and design on surface acoustic wave reflective delay line. Based on the wave equation and Chen-Haus theory, a variational principle is used to investigate surface acoustic waves passing through shorted-circuited gratings on a piezoelectric crystal. The reflection coefficient of the granting is deduced to evaluate the device performance. After obtaining these parameters, a 434 MHz SAW reflective delay line with single phase unidirectional transducers and three shorted grating reflectors is fabricated on 41°YX LiNbO3. The measured reflective coefficients agree well with the simulated one. Sharp reflection peaks, high signal noise ratio（S/N）and low spurious noise between the reflection peaks are observed.

关 键 词：声表面波传感器 反射延迟线 耦合模方程 变分原理 

分 类 号：TN65[电子电信—电路与系统]