基于SAW谐振器无源无线传感器编码方法研究  

Coding Method of Passive Wireless Sensor Based on SAW Resonator

作　　者：崔宏杰[1] 张向文[1] 

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西桂林541004

出　　处：《压电与声光》2014年第5期705-708,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(60804059);广西自然科学基金资助项目(2010GXNSFA013130)

摘　　要：为简化声表面波（SAW）传感器的编码过程,提出了一种基于SAW谐振器的编码方法,通过多个不同中心谐振频率的SAW谐振器分别连接不同的负载阻抗进行传感器的编码。设计了传感器的具体结构,建立了传感器的等效电路模型,利用ADS仿真软件对中心谐振频率分别为868MHz和915MHz的2个SAW谐振器组成的传感器进行仿真,结果表明,SAW谐振器外接1pF与4pF的阻抗,其谐振频率差可达200~300kHz。根据仿真结果,设计制作了不同编码的2个传感器,一个不外接阻抗,一个外接10pF的阻抗,测试谐振频率差别可达39.75~40.2kHz,因此,SAW谐振器外接不同阻抗时谐振频率的差异明显,基于SAW谐振器与外接阻抗的传感器编码方法是可行的。In order to simplify the coding process of the SAW sensor,a novel encoding method is proposed based on SAW resonators connecting SAW resonators with different center frequencies to different load impedance. The specific structure of the encoded sensor is designed and the equivalent circuit model is established. Two sensors consisted with SAW resonators of the center resonant frequency of 868 MHz and 915 MHz respectively,were simulated using the ADS simulation software. The results show that the center resonant frequency difference of the two SAW resonators with 1 pF external impedance and 4 pF external impedance reaches to 200-300 kHz. According to the simulation results,two different encoded sensors,one with no external impedance and another with 10 pF external impedance, were designed and tested. The measured resonant frequency difference can reach to 39.75-40.2 kHz. So the resonance frequencies of the two SAW resonators with different external impedance are different, and the sensor coding method based on tile SAW resonator and the external impedance is feasible.

关 键 词：声表面波(SAW)谐振器 无源无线 传感器 编码 外接阻抗 

分 类 号：TN65[电子电信—电路与系统]