A Singular-Feed Circularly Polarized Metasurface Antennas Using Characteristic Mode Analysis

In this paper, a singular-feed circularly polarized (CP) metasurface antenna with broad impedance bandwidth is presented. The antenna consists of modified slots with a lattice of 3 × 3 square conductive patches. Modes are selected and excited by modified slot by using characteristic mode analysis. Wideband characteristics are achieved thanks to the modified slots, leading to a new resonance. The circular polarization characteristics are generated by exciting via single feeding simultaneously. The positions of feeding are determined via characteristic mode analysis. Compared with conventional methods, the presented analysis can simplify the feeding structure and provided a compact antenna. The simulated results show an impedance bandwidth of 82% and 3 dB AR at 2.4 GHz Wireless Local Area Network (WLAN) bands.