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CPW‐FED circularly polarized asymmetric square‐ring patch antenna for RFID applications
Author(s) -
Li Xuehui,
Ren Xueshi,
Yin Yingzeng,
Wu Jianjun,
Li Zhaoxing
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28301
Subject(s) - square (algebra) , circular polarization , coplanar waveguide , turnstile antenna , microwave , axial ratio , optics , polarization (electrochemistry) , radiation pattern , return loss , patch antenna , microstrip antenna , ring (chemistry) , antenna (radio) , coaxial antenna , physics , telecommunications , engineering , microstrip , geometry , mathematics , chemistry , organic chemistry
A novel coplanar‐waveguide (CPW)‐fed circularly polarized (CP) asymmetric square‐ring patch antenna for radio frequency identification applications is presented. The circular polarization radiation is obtained simply by loading an asymmetric square‐ring on the opposite side of the CPW‐fed structure. The asymmetric square‐ring consists of a square‐ring and two bevels, which greatly contributes to pure circular polarization characteristics. For the optimized antenna prototype, experimental results show that the 10‐dB return loss and the 3‐dB axial ratio bandwidths are 10.2% (2.29–2.54 GHz) and 6.9% (2.33–2.5 GHz), respectively, which agree well with the simulated results. Detailed design results of the proposed antenna have been studied by high frequency structure simulator and experiments. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1232–1235, 2014