Jouali Redouane, Ouahmane Hassan, Khan Jalal, Liaqat Maryam, Bhaij Azize, Ahmad Sarosh, Haddad Abderrahim, Aoutoul Mohssin
LTI Laboratory, Ecole Nationale des Sciences Appliquées, Chouaib Doukkali University, El Jadida 24000, Morocco.
Department of Telecommunication Engineering, University of Engineering & Technology, Mardan 23200, Pakistan.
Micromachines (Basel). 2023 Jun 30;14(7):1364. doi: 10.3390/mi14071364.
This paper proposes a small-size UHF RFID tag antenna, which was designed to function in the frequency interval of 860-960 MHz, with a large-read range of up to 17 m. In this work, the effects of capacitive slots and gaps on the impedance matching between conventional industrial chips and a designed RFID antenna was investigated. Simulated and measured results provided a clear indication that these two techniques can efficiently improve the return loss parameter and the antenna impedance matching behavior at the UHF band. Three-dimensional electromagnetic (EM) simulations results further proved that a better impedance matching between an industrial chip and a proposed RFID antenna occurs at 870 MHz, where the estimated input antenna impedance was about = 16 + 184 (Ω), and the calculated read range reached a value of up to 17 m with a measured return loss value of -14 dB. The proposed RFID antenna can almost maintain the same read range value over a 180 degree angle variations on the horizontal plane owing to its omnidirectional radiation pattern. The fabrication and test stages of the antenna prototype were scheduled to validate the simulated characteristics. Experimental results confirmed the performances of our proposed RFID tag antenna and proved its potential ability for localization applications. EM simulations have been performed using the well-known commercial EM software simulator CST MWS.
本文提出了一种小型超高频射频识别（UHF RFID）标签天线，其设计工作频率范围为860 - 960 MHz，最大读取范围可达17 m。在这项工作中，研究了电容性缝隙对传统工业芯片与所设计的RFID天线之间阻抗匹配的影响。仿真和测量结果清楚地表明，这两种技术能够有效改善超高频频段的回波损耗参数和天线阻抗匹配性能。三维电磁（EM）仿真结果进一步证明，工业芯片与所提出的RFID天线在870 MHz时能实现更好的阻抗匹配，此时估计的天线输入阻抗约为 = 16 + 184（Ω），计算得出的读取范围达到17 m，测量得到的回波损耗值为 - 14 dB。由于其全向辐射方向图，所提出的RFID天线在水平面上180度角度变化范围内几乎能保持相同的读取范围值。天线原型的制作和测试阶段旨在验证仿真特性。实验结果证实了我们所提出的RFID标签天线的性能，并证明了其在定位应用中的潜在能力。已使用著名的商业电磁软件模拟器CST MWS进行了电磁仿真。
