Open AccessPlanar hexagonal broadband near‐field antenna for UHF RFID application
Author(s) -
Xing Zijian,
Li Haotian,
Wang Ling,
Sim ChowYenDesmond,
Li Jianying,
Wei Kun
Publication year - 2020
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.2019.0782
Subject(s) - ultra high frequency , planar , dipole antenna , broadband , slot antenna , return loss , electrical engineering , antenna measurement , loop antenna , optics , monopole antenna , antenna (radio) , materials science , coaxial antenna , optoelectronics , acoustics , physics , computer science , engineering , computer graphics (images)
In the design of ultra‐high‐frequency (UHF) radio frequency identification (RFID) near‐field antennas, realising an antenna with electrically large size, wide frequency band, and far read range has always been a challenge. To solve these problems, a planar hexagonal broadband near‐field antenna for UHF RFID applications is proposed and investigated. The antenna structure is composed of six dipoles (resembles three sets of double‐arrow structures) that are printed on the top and bottom surfaces of an FR4 substrate, forming a dual‐layer (inner and outer layers) broken hexagonal loop. The 10 dB return loss bandwidth of the proposed antenna can reach up to 20.8% (856–1055 MHz), thus able to cover the entire European Telecommunication Standards Institute and Federal Communication Commission system operating bands. Since the current distribution along the loop is kept in a single direction and the length of each dipole is ∼1/2 wavelength ( λ ), strong and uniform z ‐component magnetic field distribution with an 18 cm read range can be obtained in the near‐field zone of the antenna. As the proposed near‐field antenna has a planar size of 175 mm × 175 mm, it is suitable for multi‐system and wide‐range RFID applications.