• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.7A
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• pp.537-546
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• 2003

This paper proposes an aperture coupled circular polarized patch antenna operating at ISM band(5GHz). For improving the characteristic and performance of broadband and circular polarization at single circular polarized patch antenna. We designed and analyzed the sequentially rotated arrayed(SRA) using phase delay of 0$^{\circ}$, 90$^{\circ}$, 180$^{\circ}$, 270$^{\circ}$and 0$^{\circ}$, 45$^{\circ}$, 90$^{\circ}$, 135$^{\circ}$. Experimental result, the SRA antenna using phase delay of 90$^{\circ}$and 45$^{\circ}$are improved at the wideband and axial ratio. Also, the SRA antenna using phase delay of 45$^{\circ}$verified that it is better bandwidth and axial ratio than the SRA antenna using phase delay of 90$^{\circ}$.