Broadband cross dipole antenna for UHF near-field RFID applications

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 (S-11 < -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 x 142 mm.

Automated summary

This paper presents a broadband cross dipole antenna for UHF RFID applications, which has strong identification performance and wide operating bandwidth. Designed with two perpendicular coplanar dipoles, the antenna achieves broadband characteristics by adjusting the length of one dipole.