In this study, a novel compact radio frequency identification (RFID) tag antenna with a combination of a dipole and the double-layer symmetric electromagnetic band gap (DLS-EBG) structure is proposed for metallic objects in ultra-high-frequency (UHF) band. The DLS-EBG unit cell consists of a symmetrical double-layer structure and offset vias for tag miniaturisation. The equivalent circuit model of the unit cell is developed to analyse reflection phase characteristics. The measurement results show that the bandwidth ranges from 876 to 992 MHz and the impedance matching of the tag remains stable as the metal plate changes. The reading distance of the tag on the metal plate is up to 12.3 m under the transmitted equivalent isotropic radiated power (EIRP) of 36 dBm. Measurement and simulation results agree well.

中文翻译：

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基于DLS-EBG结构的用于金属物体的UHF RFID标签天线

在这项研究中，提出了一种新颖的紧凑型射频识别（RFID）标签天线，该天线结合了偶极子和双层对称电磁带隙（DLS-EBG）结构，用于超高频（UHF）中的金属物体带。DLS-EBG单元电池由对称的双层结构和用于标签小型化的偏置过孔组成。开发了单位单元的等效电路模型以分析反射相位特性。测量结果表明，带宽范围为876至992 MHz，并且随着金属板的变化，标签的阻抗匹配保持稳定。在36 dBm的发射等效全向辐射功率（EIRP）下，金属板上标签的读取距离可达12.3 m。测量和仿真结果吻合良好。