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Dual-Polarized Tx/Rx Antenna for UHF RFID Reader  

Kang Chae-Woon (Department of Radio Engineering, Honam University)
Yun Gi-Ho (Department of Radio Engineering, Honam University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.12, 2005 , pp. 1213-1221 More about this Journal
Abstract
In this paper, dual-polarized antenna for UHF RFID reader has been described. Feeding network and antenna structure have been designed, such that both port isolation between transmitting and receiving port and cross-polarization be maximized, and overall antenna size be minimized as well. In addition, sequentially rotated feeding scheme has been adopted to secure axial ratio bandwidth in the circular polarization. Test results show 2.35 dBi antenna gain in 900 to 928 MHz frequency range and 150 MHz axial ratio bandwidth, respectively. And, the proposed antenna has a port isolation of -40 to -38 dB and a cross-polarization of -40 to -30 dB.
Keywords
RFID; Dual-Polarized Antenna; Sequential Rotation; Circular Polarization; Isolation;
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  • Reference
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