The effective directivity of resonator antenna using curved strip dipole

This paper presents the optimum shape of a curved strip dipole antenna for maximum directive gain, which is used for excitation source of the circularly polarized resonator antenna. The proposed antenna consists of three main components, a curved strip dipole, conductor plane, and electromagnetic band gap (EBG). A curved strip dipole is constructed of a metallic sheet and bended to be a half of annular with feed point at the center for yielding wider beamwidth. Furthermore, EBG and conductor plane are used for cavity wall which is made practical use for high gain antenna. In this study, two difference shape of a curved strip dipole antenna located on conductor plane at 45° angle are appropriated, they are begotten the circularly polarized antenna. Finally, a well shape optimization case is presented together with axial ratio, directivity, and radiation patterns.