Enhancement of directivity for planar antenna array using tubular metallic frame

Анотація

The article is devoted to planar antenna arrays in which each radiating element is enclosed by metallic tubes. To provide radiation with circular polarization, open ends of square-section waveguides are used as radiating element. The proposed framing technique enhances the array's directivity and significantly suppresses backlobe radiation. Two design configurations are analyzed: in the first case, the tubes are not interconnected, while in the second, they are joined at the angle of 45°. Arrays consisting of 3×3, 4×4, and 5×5 elements are examined. The directivity dependences on the diameter of the framing tubes are presented. The optimal values of the diameters that ensure maximization of the directivity are determined.