Abstract
A wideband circular polarized planar monopole antenna array (PMAA) that employs dual band-notched characteristics is presented in this paper. The proposed antenna array is formed by four pinwheel-shaped folded planar monopole antennas (PMAs) in order to improve the performance of circular polarization and high directivity. Also, it achieves low-proflle, small-sized structure. The attractive characteristics of the proposed PMAA are a wide impedance bandwidth of 87.3% (1GHz to 2.55GHz), the 3dB axial-ratio (AR) bandwidth of 92.3% (1.05GHz to 2.85GHz) excluding dual notch bands, the total bandwidth of 35% (1.8GHz to 2.55GHz), and the maximum gain of 8.24dBic within the total bandwidh. Moreover, in order to generate dual band-notched characteristics in a circular polarized antenna, a folded PMAA with multiple U radiators and inverted W slots is proposed.
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