Abstract
This paper presents a design of a radio frequency identification (RFID) tag antenna in the ultra-high-frequency (UHF) range, which is applicable to a vehicular license plate attached to a vehicle bumper. The main goals are to first improve the identification ratio by controlling the radiation beam pattern and, second, to control the beam direction. Since every vehicle has a license plate, the available plate structure is used to design the antenna. The shape of the tag is rectangular and has a dimension of 525 mm × 116 mm, which is smaller than the typical size of standard plates, 540 mm × 120 mm, used in Europe and Korea. The fabricated tag antenna, the license plate, and the vehicular bumper are fixed by volt and nut. For vehicle tracking and identification, RFID readers are deployed on the road side. For efficient identification, a long distance passive UHF RFID license plate with a patch antenna is proposed to provide not only line-of-sight identification but also left and right beams. Unlike the general UHF tag antennas, in this paper, the patch antenna is designed to attach to the metal part of the car, the license plate holder. The beam patterns of the RFID tag antenna can be controlled by the patch antenna parameter values. The simulation result demonstrates that the proposed UHF RFID tag antenna has a beam radiation pattern as required at 920 MHz. In addition, the estimated read range of the proposed plate meets the requirement of RFID systems.
Highlights
This article presents the design of a passive ultra-high-frequency (UHF) radio frequency identification (RFID) tag antenna that is applied to the vehicular license plate and attached to the vehicle bumper
To design a UHF RFID tag antenna, the impedance (Za ) of a tag antenna should be the complex conjugate of the impedance of the RFID integrated circuit (IC) of the tag (ZC )
Patch antenna the back are sideaccording of a plate holder
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. With the continuous development of radio frequency identification (RFID) tags, RFID wireless communication is used in various applications to find out information about an object It is used in the pharmaceutical, automobile, iron and steel, logistics, and alcoholic beverage industries. This article presents the design of a passive ultra-high-frequency (UHF) radio frequency identification (RFID) tag antenna that is applied to the vehicular license plate and attached to the vehicle bumper. The reading distance range can become longer than that of conventional commercial tag antennas It has the advantage of an improved identification ratio by controlling the radiation beam pattern in a way that the vehicular license plate tag antenna can be detected by readers installed on the road side or toll gates as the vehicle passes through it.
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