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A Low-Cost Printed CP Patch Antenna for RFID Smart Bookshelf in Library

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3 Author(s)
Pui-Yi Lau ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; Yung, K.K.-O. ; Yung, Edward Kai-Ning

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.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:57 ,  Issue: 5 )

Date of Publication:

May 2010

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