Radiation Properties of Ring-Shaped Microstrip Antenna Array

Motohiko KOBAYASHI  Eko Tjipto RAHARDJO  Shin-ichiro TSUDA  Misao HANEISHI  

IEICE TRANSACTIONS on Electronics   Vol.E78-C    No.8    pp.995-1001
Publication Date: 1995/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter-Wave Technology)
R-MSA,  mutual coupling,  active reflection coefficient,  planar array,  microstrip antenna,  

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In this paper, mutual coupling S21 between RMSA (ring-shaped microstrip antenna) elements was estimated by the EMF method based on the cavity model. Then, the validity of the proposed method was tested by experiments. The experiments confirmed satisfactory agreement between the computed and experimental data for S21 in both E- and H-plane arrangements. In addition, a circularly polarized planar array composed of R-MSA elements was designed on the basis of the data of S21. The experimental results of such a planar array demonstrated high performance in radiation pattern as well as axial ratio property. Furthermore, the active reflection coefficient Γ in the R-MSA array was also investigated in both equilateral and square arrangements. The computed results of active reflection coefficient in the array demonstrated high performance in both arrangements.