Broadband cross dipole antenna for UHF near-field RFID applications

Abstract

A broadband cross dipole antenna for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications is proposed in this paper. The proposed antenna with two perpendicular coplanar dipoles can identify the tags that placed random perpendicularly to the antenna's surface. A prototype is fabricated and tested for verification. By adjusting the length of one dipole, the broadband characteristic is obtained. Measured results show that the operating bandwidth (S11 < -10 dB) is about 210 MHz from 852 to 1062 MHz. Meanwhile, a strong and uniform magnetic-field distribution surrounding the antenna is achieved with an interrogation zone of 142 mm × 142 mm.

A low-profile wideband dual-polarized antenna with nonuniform metasurface

“…Some antenna items such as antenna height, impedance bandwidth, and gain are compared to show the advantages of our antenna. In [4], the antenna with a steerable beam with metasurface is presented, but its impedance bandwidth is only 3.3-3.6 GHz and the height is 0.4λ. A compact dualpolarization filter antenna is proposed in [17].…”

“…After many years of development, there are many users of wireless communication systems, so the requirements for the communication system are higher. To meet the needs of users, dipole antennas are widely used in base station antennas [1,2,3,4,5]. The advantages of the dual-polarized antenna are wideband, multi-frequency, and multi-mode, which can be used to resist channel attenuation and increase channel capacity [6,7,8,9].…”

A wideband dual-polarized crossed antenna with low profile and enhanced gain performance

“…However, the only broadband characteristics cannot meet the increasingly high channel capacity requirements of modern communication systems. Thus, a lot of antennas with horizontally polarized (HP) and vertically polarized (VP) performance have begun to appear in everyone's view due to their unique properties such as polarization diversity, frequency reuse and reducing multipath fading [18,19,20,21,22,23].…”