Title :
A Low-Cost Printed CP Patch Antenna for RFID Smart Bookshelf in Library
Author :
Lau, Pui-Yi ; Yung, Kenneth Kin-On ; Yung, Edward Kai-Ning
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China
fDate :
5/1/2010 12:00:00 AM
Abstract :
This paper presents a small wideband circularly polarized patch antenna printed on the low-cost FR-4 material for radio-frequency-identification smart bookshelves in libraries. The antenna is composed of four top-loaded patches sequentially rotated with a phase difference of 90?? and double shorted to the ground. It operates at a center frequency of 0.915 GHz. The impedance bandwidth (SWR < 2) is 26.8%, the axial-ratio (AR) bandwidth (measured AR < 3 dB) is 11.6%, and the 3-dB beamwidth is 115??. The antenna gain is about 4 dBi, and the overall dimension is reduced by ~60% in length, in comparison with that of the conventional sequential patch antenna.
Keywords :
antenna feeds; antenna radiation patterns; broadband antennas; library automation; microstrip antennas; polarisation; radiofrequency identification; antenna gain; axial-ratio bandwidth; impedance bandwidth; low-cost FR-4 material; low-cost small circularly polarized patch antenna; low-cost small wideband patch antenna; radio frequency identification smart bookshelves; sequentially rotated feeding; top-loaded patches; Antenna array; circularly polarized (CP); radio-frequency identification (RFID) antenna; sequentially rotated feeding; small patch antenna; wide-beamwidth antenna;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2009.2035992
