基于COMSOL的声表面波标签仿真  

Simulation of Surface Acoustic Wave Tag Based on COMSOL

作　　者：卢旭[1] 陈智军[1] 黄鑫[1] 陈涛[1] 夏前亮[1] 

机构地区：[1]南京航空航天大学自动化学院,江苏南京210016

出　　处：《压电与声光》2012年第4期494-497,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51005121);航空科学基金资助项目(2010ZD52045);教育部博士点基金资助项目(200802871037);南京航空航天大学基本科研业务费专项科研基金资助项目(NS2010061)

摘　　要：以有限元法为基础,利用有限元软件COMSOL对声表面波标签进行仿真。声表面波标签的基片材料为铌酸锂压电单晶,叉指换能器与反射栅采用金属铝电极。通过频率特性仿真,提取了标签的谐振频率和反谐振频率,分析了叉指换能器金属电极对谐振频率的影响,获得了标签的幅频特性曲线。通过回波特性仿真,研究了不同反射栅编码对应的回波脉冲,分析了反射栅金属电极对回波脉冲的影响。Based on the finite element method,the surface acoustic wave tag is simulated using COMSOL software. The substrate material is lithium niobate. The metal electrodes of the inter-digital transducers and the reflectors are both made up of aluminum. By the frequency characteristic simulation, the resonant and anti-resonant frequencies are extracted. The influence of the inter-digital transducers metal electrode on the resonant frequency is analyzed,and the amplitude-frequency curve is obtained. By the echo pulse characteristic simulation, the different echo pulses corresponding on different reflector encodings are researched. The influence of the reflector metal electrode on the echo pulse is analyzed.

关 键 词：声表面波标签 有限元 叉指换能器 反射栅 谐振频率 回波脉冲 

分 类 号：TN65[电子电信—电路与系统]