In this paper, a compact, broadband linearly tapered meandered monopole tag antenna for UHF‐RFID is designed and optimized using particle swarm optimization (PSO) algorithm. An inductive T‐match network is utilized for impedance matching with capacitive Higgs‐4 chip. The optimization goal of PSO was conjugate matching and in consequence the maximization of read range. Equivalent circuit of the proposed tag antenna is derived using ADS software to validate its impedance characteristics. The performance of the proposed tag in terms of tag power sensitivity, read range, realized gain, and differential radar cross section has been experimentally characterized. To check the tolerance of the designed tag to various object platforms, its read range performance is also verified on objects like wood, fiber, plastic, and so forth. Furthermore, read pattern of the proposed tag has been measured and found to have figure of eight in E‐plane and omnidirectional in H‐plane. Experimental results reveal that the proposed tag covers 865‐867 MHz (ETSI band, Europe) and 902‐928 MHz (FCC band, United States) both major RFID bands with a read range of 10 and 12 m, respectively. The proposed tag has 2060 mm³ of volumetric size with maximum measured readable distance of 12 m with EIRP of 3.28 W.

中文翻译：

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具有T型匹配的线性锥形曲折线宽带单极标签天线，用于超高频射频识别应用

在本文中，使用粒子群优化（PSO）算法设计并优化了用于UHF-RFID的紧凑型宽带线性锥形曲折单极标签天线。电感性T匹配网络用于与容性Higgs-4进行阻抗匹配芯片。PSO的优化目标是共轭匹配，因此可以最大化读取范围。建议的标签天线的等效电路是使用ADS软件推导出来验证其阻抗特性的。提出的标签在标签功率灵敏度，读取范围，实现的增益和差分雷达横截面方面的性能已通过实验进行了表征。为了检查设计的标签对各种对象平台的耐受性，还对木材，纤维，塑料等对象验证了其读取范围性能。此外，已对拟议标签的读取模式进行了测量，发现其在E平面上为8位，在H平面上为全向。实验结果表明，建议的标签覆盖865-867 MHz（欧洲的ETSI频段）和902-928 MHz（FCC频段，美国）两个主要的RFID波段，其读取范围分别为10 m和12 m。建议标签的长度为2060毫米³的体积大小，最大测得可读距离为12 m，EIRP为3.28W。