Circularly polarized reconfigurable metaline antenna

A circularly polarized (CP) antenna is proposed, where four metalines are used as radiation elements. This CP antenna supports a negative phase constant current, leading to a small antenna height of approximately 1/100 wavelength. The same antenna characteristics are reproduced even when the feed point position is changed for beam-steering in the azimuth plane, because the metalines are arrayed symmetrically with respect to the antenna center point. Thus, this CP antenna works as a reconfigurable antenna. The radiation pattern and VSWR are analyzed and discussed.