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基于射频识别技术原理及Friis传输方程,导出了无源超高频射频识别系统链路模型,结合二端口网络分析方法,导出了标签密集环境下的标签天线互阻抗计算表达式.利用单阅读器单标签时的标签阻抗匹配条件,基于功率传输系数及调制因子,分析了互偶效应对系统链路的影响.在开阔室内环境中,测试了双标签及标签单、双平面布置情形下的阅读器天线最小发射功率及系统识别率.测试结果表明,双标签及双平面情形下,阅读器天线最小发射功率变化率分别为(7%,11.6%)及(10%,12.5%).
Based on the principle of radio frequency identification technology and Friis transmission equation, the link model of passive UHF RFID system is derived, and the two-port network analysis method is used to derive the expression of tag antenna transimpedance in tag-intensive environment. Based on the power transfer coefficient and modulation factor, the influence of mutual coupling on the system link was analyzed.Under the open indoor environment, the test of double-label and label-single and double-plane layout The minimum transmit power of antenna and the recognition rate of the system are tested.The results show that the minimum transmit power change rate of the reader antenna is (7%, 11.6%) and (10%, 12.5%) in the case of dual-tag and dual-plane, respectively.