为了对内含铝箔的卷烟包装进行防伪识别，设计了一种无源超高频射频识别（UHF RFID）抗金属标签天线。该天线结构简单，可印刷于烟盒表面，并能与包装的金属拉线结构一体化，增强标签的防伪性能。采用Ansoft HFSS软件建模仿真，分析了主要结构参数的变化对标签天线输入阻抗的影响。优化后的结果表明，该天线具有较高的增益、较远的读取距离、良好的方向性和阻抗匹配特性，且带宽能够覆盖915 MHz UHF RFID频段范围。制作标签样品并进行实际测试，结果表明：实测与仿真结果较吻合，读取距离可达8 m，能够满足实际应用的需求。%A passive UHF RFID anti⁃metal tag antenna was designed for anti⁃counterfeit identification of the cigarette pa⁃ckage containing aluminum foil. The antenna has simple structure,and can be printed on the surface of the cigarette package and integrated with the package′s metal wire structure to enhance the anti⁃counterfeiting performance of the tag. The Ansoft HFSS software is used for modeling and simulation. The influences of the main structure parameters on input impedance of the tag antenna are analyzed. The optimal results show that the antenna has high gain,far read range,good directivity and impedance matching characteristics,and the bandwidth of the tag antenna can cover the UHF RFID frequency band range of 915 MHz. A tag sample was produced and tested practically. The results show that the actual measurement result is match to the simulation result,the read range can reach up to 8 m,and the antenna can meet the requirement of the practical application.
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