标签天线弯曲对射频识别系统性能影响的研究

Study on the Influence of Curving of Tag Antennas on Performance of RFID System

探讨了工作在微波段的无源射频识别(Radio frequencyIdentification, RFID)系统中标签天线的弧形弯曲对RFID系统性能的影响。分析比较了几种典型的半波振子标签线天线弧形弯曲的情况。通过理论分析确立标签天线的方向系数与输入阻抗为RFID系统性能的主要影响因子。弯曲振子天线特性参数由线天线分析软件NEC WinBasic数值模拟得到。分析结果表明,标签天线的弧形弯曲使得无源RFID系统的工作距离明显变短。因此,为避免此类问题有必要在RFID系统中考虑对于弯曲具有低敏感性的天线结构。

The influence of arc curing of tag antennas on the performance of Radio Frequency Identification operating at microwave region is discussed. The arc curving of several typical half wave dipole wire antennas were investigated. We find the directivity and the input impedance of the antennas take the most effect to the RFID system through theoretical analysis. The antennas characteristics were numerical simulated using NEC-Win Basic fitted to wire antennas. Results show that the operating range of a passive RFID system can be degraded significantly due to arc curving of the tag antennas. Therefore, antenna structures less sensitive to curving should be considered for RFID systems to avoid this kind of distortion.