Wide Angle Scanning Circular Polarized Meta-Structured Antenna Array

Chang-Hyun LEE  Jeong-Hae LEE  

Publication
IEICE TRANSACTIONS on Communications   Vol.E101-B   No.9   pp.2017-2023
Publication Date: 2018/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3443
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
beam scanning,  mutual coupling,  mu-zero antenna,  active element pattern,  active reflection coefficient,  

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Summary: 
This paper presents a meta-structured circular polarized array antenna with wide scan angle. In order to widen the scanning angle of array antennas, this paper investigates unit antenna beamwidth and the coupling effects between array elements, both of which directly affect the steering performance. As a result, the optimal array distance, the mode configuration, and the antenna structure are elucidated. By using the features of the miniaturized mu-zero resonance (MZR) antenna, it is possible to design the antenna at optimum array distance for wide beamwidth. In addition, by modifying via position and gap configuration of the antenna, it is possible to optimize the mode configuration for optimal isolation. Finally, the 3dB steerable angle of 66° is successfully demonstrated using a 1x8 MZR CP antenna array without any additional decoupling structure. The measured beam patterns at a scan angle of 0°, 22°, 44°, and 66°agree well with the simulated beam patterns.