分布式天线UHF RFID系统读取率的评估方法

Evaluation Method of Read Rate from Distributed Antennas for UHF RFID Systems

为了对超高频射频识别系统的读取率进行评估,提出了基于分布式天线结构的评估方法。分布式天线结构是指通过射频开关选择器件蒋四个天线连接到一个阅读控制器上,考虑到电磁场极化现象,增强覆盖效果,减少阅读盲区,天线分布在识别区域的水平和垂直两个相对的方向上。为了实现对系统读取率的评估,根据四个天线实际的识别情况,定义了系统读取率的评估参数,即可靠识别率。仿真实验结果表明:基于分布式天线结构的这种评估方法可以有效的对UHF RFID系统的读取率进行评估。

A distributed antenna structure operating at the ultra-high frequency（UHF） is presented in order to evaluate read rate of radio frequency identification（RFID） systems. The distributed four antennas are connected to a reader with radio frequency switch. The antennas are deployed on opposite sides in both vertical and horizontal directions of read area due to the polarisation of the electronmgnetic field. This distributed structure can heighten the coverage effect of system and decrease read blind spots. This evaluative paramater is called as reliable identification rate. The evaluative paramater can estimate read rate of RFID system according to actual identification situation of four distributed antennas. Simulation experimental results indicate that this evaluation method of read rate is effective based on four distributed antennas for UHF RFID systems.