Open AccessDesign of near‐field ultra‐high frequency radio‐frequency identification antenna with fragmented wires for electrically‐large coverage
Author(s) -
Ding Dawei,
Tao Yonghui,
Wang Gang
Publication year - 2016
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2015.0750
Subject(s) - ultra high frequency , radio frequency identification , antenna (radio) , antenna tuner , radio frequency , acoustics , impedance matching , electronic engineering , electrical impedance , electrical engineering , near and far field , computer science , dipole antenna , engineering , antenna factor , physics , optics , computer security
Design of ultra‐high frequency radio‐frequency identification (UHF RFID) reader antenna covering electrically‐large near‐field area is still challenging for near‐field UHF RFID applications. In such design, magnetic field distribution on a large coverage area is required to be as uniform as possible. Fragment‐type wire antennas are quite suitable for such demand because distribution of fragmented wires in a designated electrically‐large area can be optimised to counterpoise the magnetic fields generated by non‐uniform current distribution. By optimisation searching with multiobjective evolutionary algorithm based on decomposition combined with enhanced genetic operators, fragment‐type RFID reader antenna is designed to provide uniform magnetic field distribution within dynamic range of 4 dB in an electrically‐large near‐field coverage of 320 × 320 mm at 915 MHz. The designed antenna is fabricated and tested. Both simulation and measurement results show good impedance matching, satisfactory near‐field coverage, and desirable omni‐directional pattern.