Compact tag antenna for UHF active RFID applications

Abstract

By introducing an L-shaped metal plate connecting with the spiral monopole antenna, a planar compact ultra-high-frequency (UHF) tag antenna for radiofrequency identification system is proposed. With the overall antenna size of only 13 × 9 × 1.6 mm3, the proposed tag antenna provides the measured impedance bandwidth of 12 MHz to comply with Taiwan UHF operating band (922–928 MHz). The measured peak gain and antenna efficiency are approximately −1.1 dBi and 27% for Taiwan UHF band, respectively. Meanwhile, the measured reading distance can approach 250 m. Good tag sensitivity is obtained across the desired frequency band.

Design and analysis of broadband circularly polarized compact planar antennas for 2.45 GHz RFID handheld reader applications

“…In [7], an arc-shaped strip is used to generate two orthogonal degenerated modes to achieve circular polarization, which is an essential requirement of the RFID band. An L-shaped plate is used to miniaturize the size of designed antenna for RFID application [8]. In [9], truncation of corners and eight slots in the four directions and one at the center of the square-shaped radiator are used to get circular polarization and size reduction, respectively.…”

A new design of UHF tag antenna for clothing identification using SRR

“…That makes it possible to identify an object, an animal or a human being, to follow its path or to know its characteristics remotely using a tag attached or incorporated in the object and reflecting radio waves [1]. Nowadays, radio frequency identification (RFID) technology has many applications in many fields and is based on several standards and regulations.…”