Electrically Large Zero-Phase-Shift Line Grid-Array UHF Near-Field RFID Reader Antenna

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Electrically Large Zero-Phase-Shift Line Grid-Array UHF Near-Field RFID Reader Antenna
Title:
Electrically Large Zero-Phase-Shift Line Grid-Array UHF Near-Field RFID Reader Antenna
Journal Title:
IEEE Transactions on Antennas and Propagation
DOI:
Keywords:
Publication Date:
13 January 2014
Citation:
J. Shi, X. Qing and Z. N. Chen, "Electrically Large Zero-Phase-Shift Line Grid-Array UHF Near-Field RFID Reader Antenna," in IEEE Transactions on Antennas and Propagation, vol. 62, no. 4, pp. 2201-2208, April 2014. doi: 10.1109/TAP.2014.2299824
Abstract:
A grid-array antenna using a zero-phase-shift (ZPS) line is proposed to enlarge the interrogation zone of a reader antenna for near-field ultra-high-frequency (UHF) radio frequency identification (RFID) system. The proposed grid-array antenna is composed of a number of grid cells and a double-sided parallel-strip line feeding network. Each grid cell, namely segmented loop constructed by the ZPS line, has uniform and single-direction flowing current along the line. By configuration of the cells sharing a common side with its adjacent grid cells which carry reverse-direction flowing current, a grid-array antenna is formed to generate a strong and uniform magnetic-field distribution over a large interrogation zone even when the perimeter of the interrogation zone reaches up to (where is the operating wavelength in free space) or larger. As an example, a grid-array antenna with 1 2 segmented ZPS line loop cells implemented onto a piece of FR4 printed board (PCB) is designed and prototyped. The results show that the grid-array antenna achieves the impedance matching over the frequency range from 790 to 1040 MHz and produces strong and uniform magnetic-field distribution over an interrogation zone of 308 mm 150 mm.
License type:
PublisherCopyrights
Funding Info:
Description:
(c) 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
ISSN:
0018-926X
1558-2221
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