DocumentCode
1110683
Title
Compact Integrated Antenna With Circulator for UHF RFID System
Author
Lim, Won-Gyu ; Son, Wang-Ik ; Oh, Kyoung Sub ; Kim, Wan-Kyu ; Yu, Jong-Won
Author_Institution
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon
Volume
7
fYear
2008
fDate
6/30/1905 12:00:00 AM
Firstpage
673
Lastpage
675
Abstract
A passive UHF radio frequency identification (RFID) reader antenna with high transmit/receive isolation, which consists of two quadrifilar spiral antennas (QSAs) and the feeding networks, is proposed. The high isolation can be achieved by two concentric, circularly polarized antennas and 4-point feed circuits, which make the same circular polarization. The simulated and experimental results show that the transmit/receive isolation is more than 40 dB and the gains of two QSAs are 1.0 dBi for the inner QSA and 0.7 dBi for the outer QSA at the 910 MHz, respectively.
Keywords
UHF antennas; circulators; polarisation; radiofrequency identification; spiral antennas; UHF RFID system; circular polarization; circulator; compact integrated antenna; feeding networks; frequency 910 MHz; quadrifilar spiral antennas; Antenna isolation; RFID; circular polarization; circulator; quadrifilar spiral antenna; quadrifiliar spiral antenna; radio frequency identification (RFID);
fLanguage
English
Journal_Title
Antennas and Wireless Propagation Letters, IEEE
Publisher
ieee
ISSN
1536-1225
Type
jour
DOI
10.1109/LAWP.2008.921348
Filename
4476051
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