Deleterious effects of the metallic environments on a radio frequency identification (RFID) antenna are often alleviated by the magnetic shielding. This article presents a novel model to study quantitatively the magnetic shielding effect on an RFID coil antenna in metallic environments with a ferrite toroid. From the proposed model, the magnetic field intensity within the antenna is derived, and the computational results are in good agreement with those from the numerical simulations. Then, the optimal geometrical parameters of the ferrite toroid for proper shielding are investigated, and the shielding effect on an RFID solenoid coil antenna against the metal is discussed. Finally, an experiment has been carried out and the results show that the shielding with the ferrite toroid can alleviate the deleterious effects of the metals almost completely.

中文翻译：

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铁氧体环形金属环境中 RFID 线圈天线的磁屏蔽效应分析


磁屏蔽通常可以减轻金属环境对射频识别 (RFID) 天线的有害影响。本文提出了一种新颖的模型，用于定量研究铁氧体环形金属环境中 RFID 线圈天线的磁屏蔽效应。从所提出的模型中，推导出天线内的磁场强度，计算结果与数值模拟的结果非常吻合。然后，研究了实现适当屏蔽的铁氧体环形线圈的最佳几何参数，并讨论了 RFID 螺线管线圈天线对金属的屏蔽效果。最后进行了实验，结果表明铁氧体环形线圈的屏蔽几乎可以完全减轻金属的有害影响。