Compact Integrated Antenna With Circulator for UHF RFID System

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 fee...

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Veröffentlicht in:	IEEE antennas and wireless propagation letters 2008, Vol.7, p.673-675
Hauptverfasser:	Lim, Won-Gyu, Son, Wang-Ik, Oh, Kyoung Sub, Kim, Wan-Kyu, Yu, Jong-Won
Format:	Artikel
Sprache:	eng
Schlagworte:	Antenna feeds Antenna isolation Circuits circular polarization circulator Mutual coupling Polarization quadrifilar spiral antenna radio frequency identification (RFID) Radiofrequency identification Receiving antennas Spirals Supply chain management Transmitting antennas UHF antennas
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Beschreibung
Zusammenfassung:	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.
ISSN:	1536-1225 1548-5757
DOI:	10.1109/LAWP.2008.921348