Design and Implementation of Long-Distance Dual Pifa Antenna Structure of Small Embedded Metal Uhf Rfid Tag

Abstract

As the advanced technology in the Internet of Things (IoT), ultra-high frequency radio frequency identification (UHF RFID) tag has broad application prospects and significant research value. However, the transmission performance of UHF RFID on the metal surface and embedded in metal is severely impaired, bringing new challenges to its application for long-distance reading and writing. On this basis, an embedded metal UHF RFID tag design method is proposed in this paper. A planar inverted F antenna (PIFA) structure is optimized to enhance the anti-metal performance of the tag. The embedded feed design is adopted to achieve preferable impedance matching between antenna and chip. Besides, a series of electromagnetic simulations were investigated to optimize the performance of the tag, which can ultimately achieve the maximum gain of −9.7 dB in the metal groove, with the reduced volume of 19.8 mm × 25.8 mm × 2 mm by employing the meandering technology and the method of adding metal via holes. Finally, when the self-made tag is embedded in the metal groove, the experimental results demonstrate that the maximum reading distance can reach 1.26 m, indicating that the tag developed in this paper has significant practical value in the case of embedded metal.

A Low-profile UHF RFID Tag Antenna Loaded with Rectangular Loop for Double-sided Anti-metal Applications

“…Its core principle is the use of radio frequency signals for tag identification and data exchange [1]. RFID technology offers advantages such as strong interference resistance, high storage capacity, contactless operation, long lifespan, capability for multi-tag recognition, and fast response [2]. In practical applications, the UHF RFID tag antennas need to be placed on objects of various materials and sizes.…”

A Compact Folded RFID Tag Antenna with Nested Deformable Rings for Two-side Anti-metal Application

“…Radio frequency identification (RFID) technology is a non-contact automatic identification technology. Ultra-high frequency (UHF) RFID systems have been widely used in logistics warehousing, asset management, medical equipment, and other fields due to their fast read rate, high capacity, and longterm storage [1,2]. Nevertheless, when the tag is placed in close proximity to metallic objects, the image current induced on the metallic surface is 180 • out-of-phase, which can significantly degrade antenna performance [3][4][5].…”