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- Title
Design of near-field ultra-high frequency radio-frequency identification antenna with fragmented wires for electrically-large coverage.
- Authors
Dawei Ding; Yonghui Tao; Gang Wang
- Abstract
Design of ultra-high frequency radio-frequency identification (UHF RFID) reader antenna covering electricallylarge 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, fragmenttype 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 x 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.
- Subjects
RADIO frequency identification systems; UHF antennas; WIRE antennas; LOOP antennas; IMPEDANCE matching; NEAR field communication
- Publication
IET Microwaves, Antennas & Propagation (Wiley-Blackwell), 2016, Vol 10, Issue 11, p1218
- ISSN
1751-8725
- Publication type
Article
- DOI
10.1049/iet-map.2015.0750