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为寻找射频识别标签用缝隙天线新结构,提高标签芯片与缝隙天线的匹配性能,提出了射频识别标签用非对称缝隙天线.研究了非对称直缝隙天线和非对称弯折缝隙天线的阻抗随缝隙的长度和弯折角度的变化规律.在天线尺寸相同的情况下,将标签用非对称直缝隙天线与对称直缝隙天线进行比较,发现非对称直缝隙天线更易于与标签芯片匹配.尝试将非对称缝隙天线与Ph ilips公司提供的标签测试芯片进行匹配,制作了相应的实物天线,仿真与测试结果说明所设计的天线满足RFID标签应用要求。
In order to find a new structure of slot antenna for radio frequency identification tag and improve the matching performance between tag chip and slot antenna, an asymmetrical slot antenna for radio frequency identification tag is proposed. The impedance of asymmetrical straight slot antenna and asymmetrical bent slot antenna is studied with the gap Length and bending angle of the antenna.When the antenna size is the same, comparing the asymmetric straight slot antenna with the symmetrical straight slot antenna, the asymmetric straight slot antenna is found to be easier to match with the tag chip.At the same time, The symmetrical slot antenna is matched with the tag test chip provided by Philips, and the corresponding physical antenna is manufactured. The simulation and test results show that the designed antenna meets the requirements of RFID tag application.