Open AccessDesign and Experimental Evaluation of Modified Square Loop Feeding for UHF RFID Tags
Author(s) -
Md. Rokunuzzaman,
Mohammad Tariqul Islam,
Haslina Arshad,
Mandeep Jit Singh,
Norbahiah Misran
Publication year - 2015
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0132530
Subject(s) - loop antenna , ultra high frequency , antenna (radio) , loop (graph theory) , impedance matching , square (algebra) , electrical impedance , input impedance , acoustics , topology (electrical circuits) , feed line , physics , electronic engineering , optics , computer science , electrical engineering , dipole antenna , telecommunications , mathematics , engineering , geometry , antenna factor , combinatorics
This paper addresses the performance evaluation of a modified square loop antenna design for UHF RFID applications that is excited through a narrow feed line connected to a square loop, an impedance matching network. The square loop dimensions are modified to reach a conjugate impedance matching. A gap is fixed between the feed-lines to link the chip. To achieve impedance matching, the structures of the feed-line are optimized accordingly. In addition, the antenna consists of a straightforward geometry. An 11.9-meter maximum read range is achieved using a compact size of 80 × 44 mm 2 and 3.2 W for the effective isotropic radiated power. Additional findings reveal that the proposed tag antenna is able to provide a stable resonance response in the near field of a large metallic surface.