声表面波标签的设计、制作和测试

与IC标签相比,声表面波标签有其独特的优势.在仿真研究的基础上,对声表面波标签进行了设计、制作和测试.标签设计主要体现在压电基片材料选择、叉指换能器设计、反射栅设计3个方面;实际制作了6组结构各不相同的标签并进行了封装;通过网络分析仪对设计制作的标签进行了测试,包括特征频率测试、反射栅编码测试、叉指换能器激发效率测试3个部分.测试结果表明,标签特征频率与设计要求一致;通过对回波脉冲幅值的判别可实现对标签编码的识别;叉指换能器对数增多和孔径增大都会增加其激发效率.

Design,Fabrication and Testing of Surface Acoustic Wave Tag

Compared with IC tag,surface acoustic wave tag has its unique advantages. Based on the simulation research,the design,fabrication and testing of SAW tag are performed.The SAW tag design includes the piezoelectric substrate material selection,the inter digital transducers design and the reflectors design.Six groups of SAW tags are fabricated and packaged.The characteristic frequency,reflector encoding and IDT excitation efficiency are experimentally tested through the network analyzer.The testing conclusions are as follows:The characteristic frequency is consistent with the design requirement;the code can be read out by analyzing the amplitude of the echo pulse;the excitation efficiency can be improved by increasing inter digital transducers pairs and aperture.