A miniaturized looped-slot patch antenna for passive UHF RFID applications using a slim single-layer substrate
Abstract
Passive ultra-high frequency radio frequency identification (UHF RFID) systems have become essential components of contemporary logistics across various industries. They play a crucial role in facilitating critical operations such as asset tracking, inventory management, and supply chain optimization. However, the effectiveness of these systems heavily relies on the design and efficiency of the employed antennas. Therefore, this paper aims to improve the efficiency of a passive UHF RFID antenna by adopting a microstrip patch design. The proposed antenna comprises a rectangular patch with a looped slot, printed on a slim single-layer dielectric substrate. To optimize performance, a comprehensive parametric study is conducted using the CST simulator, with the objective of enhancing gain while reducing the overall antenna size. As a result, a miniaturized slotted antenna design is achieved with a total size of 87×85×0.9 mm3 and a gain of 4.14 dBi at 894.4-MHz frequency. This result will contribute to the advancement of passive UHF RFID antennas, creating opportunities for enhanced detection reliability in relevant applications while simultaneously reducing system costs.
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