EZR-MZR Resonators for Compact Low-Profile Omnidirectional Circular-Polarized Antenna Design

IEEE Photonics Journal

Si-Min Li¹  Xing Jiang¹  Lin Peng¹  Kai Sun¹  Cheng-Li Ruan² 

[1] Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin, China;Institute of Applied Physics, University of Electronic Science and Technology of China, Chengdu, China;

关键词: ZOR;    EZR-MZR;    low-profile;    circular polarization;    omni-directional.;   

DOI  :  10.1109/JPHOT.2017.2723404

来源: DOAJ

【 摘 要 】

New zeroth-order resonator (ZOR): the curved EZR-MZR resonator [epsilon-zero resonance (EZR) and mu-zero resonance (MZR)] was proposed for circular-polarized (CP) antenna design with low-profile and omnidirectional characteristics. The proposed curved EZR-MZR resonator has two orthogonal polarizations with 90° phase difference (PD). By forming four resonators in a circular ring array, the MZR can be characterized as a magnetic dipole. Then, the unidirectional pattern of the horizontal polarization was transformed to be omnidirectional while the EZR with vertical polarization can be characterized as an electric dipole and it radiates omnidirectional pattern. As the PD of the vertical and the horizontal polarizations is inherently 90°, the allying of the two orthogonal polarizations leads to a CP radiation with an omnidirectional pattern. To feed the resonators with uniform amplitude and phase, a feeding network with four equal radial arms is used. The proposed omnidirectional CP antenna has the advantages of low profile from ZOR characteristics and high design efficiency from the inherent 90° PD between the orthogonal polarizations. A prototype with resonant frequency of 1.544 GHz was designed with a diameter of 57 mm (0.29 λ_r, λ_r is the free space wavelength of the resonant frequency) and a height of 4 mm (0.02 λ_r).

【 授权许可】

Unknown