DocumentCode :
740723
Title :
Planar Broadband Circularly Polarized Antenna With Square Slot for UHF RFID Reader
Author :
Lu, Jui-Han ; Wang, Sang-Fei
Author_Institution :
Dept. of Electron. Commun. Eng., Nat. Kaohsiung Marine Univ., Kaohsiung, Taiwan
Volume :
61
Issue :
1
fYear :
2013
Firstpage :
45
Lastpage :
53
Abstract :
Novel circular polarization (CP) design of planar broadband antenna with square slot for UHF RFID system is proposed and experimentally studied. By insetting the arc-shaped strip into the square slot, the proposed CP design can easily be achieved with the impedance bandwidth ( RL ≥ 10 dB) of about 142 MHz (15.3% @ 931 MHz) and the 3 dB axial-ratio (AR) bandwidth of about 166 MHz (17.7 % @ 940 MHz) for UHF RFID applications. The measured peak gain and radiation efficiency are about 6.8 dBic and 98% across the operating band, respectively, with nearly bidirectional pattern in the XZ- and YZ-plane.
Keywords :
UHF antennas; broadband antennas; electromagnetic wave polarisation; planar antennas; radiofrequency identification; slot antennas; UHF RFID reader; XZ-plane; YZ-plane; bidirectional pattern; efficiency 98 percent; impedance bandwidth; planar broadband antenna CP design; planar broadband antenna circular polarization design; radiation efficiency; square slot antenna; Antenna measurements; Bandwidth; Broadband antennas; Microstrip antennas; Radiofrequency identification; Slot antennas; UHF antennas; Broadband; circular polarization; square slot;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2012.2220103
Filename :
6310028
Link To Document :
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