基于功率检波技术的声表面波标签识别方法

声表面波射频识别系统应用前景广阔,选择结构简单、解码可靠的声表面波标签识别方法十分重要。分析比较了基于IQ解调和功率检波两种不同技术的声表面波标签识别方法,基于功率检波技术的识别方法更具优势。设计制作了基于功率检波技术的阅读器,在测试了阅读器关键元件对数功率检波器静态性能和动态性能的基础上,结合声表面波标签进一步验证了阅读器识别标签编码的能力。实验结果表明,采用功率检波技术可以实现声表面波标签编码的准确识别,且阅读器电路结构更简单,成本更低。

The Identification Method of SAW Tag Based on Power Detection Technology

As SAW RFID system has broad application prospects, it is vital to select an effective and uncomplicated method to identify SAW tags accurately.Through analysis and comparison of two different identification methods of SAW tags which are based on IQ demodulation technology and power detection technology respectively,the power detection technology based identification method has more advantages.A SAW tag reader based on power detection technology is designed and manufactured.The static and dynamic performances of the power detector, which is the key part of the reader, are tested.Furthermore,utilizing the SAW tag, the practicability of the reader for SAW tag identification is verified.The experimental results show that the power detection technology based method can identify SAW tag accurately,and has simpler reader circuit structure and lower cost.