用于结构健康检测的无芯片介电常数传感器
Chipless Dielectric Constant Sensor for Structural Health Testing
摘要：
提出了一种用于测量材料介电特性的低成本无芯片RFID传感标签。该传感器是基于去极化偶极谐振器加载印刷电容器的电容取决于位于与标签接触的材料的介电常数。介电常数由谐振频率的偏移获得。谐振器被单独测试以及被放置在周期性布置上以形成频率选择性结构（FSS）来增加交叉极化雷达截面，从而促进标签检测。建议的结构和测量程序是特别适合的民用材料的特性作为无损检测（NDT）。
英文摘要：
A low-cost chipless RFID sensor tag to determine the dielectric properties of materials is presented. The sensor is based on a depolarizing dipole resonator loaded with printed capacitors whose capacitance depends on the permittivity of the material located on contact with the tag. The permittivity is obtained from the shift of the resonance frequency. The resonator is tested both individually as well as placed on a periodic arrangement so as to form a frequency selective structure (FSS) to increase the cross- polar radar cross section, thus facilitating the tag detection. The proposed structure and measurement procedure is particularly suitable for the characterization of civil materials as a nondestructive testing (NDT).
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