Embedded Inductance Folded-Patch Antenna With Inclined Slots for On-Metal Tag Design

IF 2.3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE journal of radio frequency identification Pub Date : 2024-07-19 DOI:10.1109/JRFID.2024.3431198
Nurfarahin Miswadi;Nurul Huda Abd Rahman;Eng-Hock Lim;Suhaila bt Subahir;Mohd Aziz Aris;Muthukannan Murugesh
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Abstract

A novel radio frequency identification (RFID) folded-patch tag antenna that is designed using a double-layered configuration embedded with multiple inclined slots has been proposed for on-metal applications. The slots are functioning as a tuning mechanism for adjusting the operating frequency and antenna reactance. The operating frequency can be efficiently scaled down to the desired ultra-high frequency (UHF) band, while the reactance can be easily optimized to match with the chip reactance by adjusting the embedded inclined slots, without altering the antenna structure. The proposed tag antenna has a compact size of 32 mm $\times $ 40 mm $\times 3$ .35 mm ( $0.097\lambda \times 0.122\lambda \times 0.010\lambda $ ), and it can be fabricated on the single side of a thin polyimide substrate through chemical etching. The tag antenna has demonstrated a far-read distance of 16m when it is tested using an EIRP power of 4W. The stability of the tag operating frequency has been proven. It is unaffected by the size variation of the backing metal object.
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用于金属标签设计的带倾斜槽嵌入式电感折叠贴片天线
我们提出了一种新型射频识别(RFID)折叠式标签天线,它采用双层配置,内嵌多个倾斜槽,适用于金属应用。这些斜槽可用作调整工作频率和天线电抗的调谐机制。工作频率可以有效地降低到所需的超高频(UHF)频段,而电抗则可以在不改变天线结构的情况下,通过调整嵌入式斜槽轻松优化,以与芯片电抗相匹配。所提出的标签天线尺寸小巧,仅为 32 毫米乘以 40 毫米乘以 3.35 毫米(0.097 英寸乘以 0.122 英寸乘以 0.010 英寸),并且可以通过化学蚀刻在薄聚酰亚胺衬底的单面上制作。在使用 4W 的 EIRP 功率进行测试时,标签天线的远读距离达到了 16 米。标签工作频率的稳定性已得到证实。它不受底层金属物体尺寸变化的影响。
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