Short Circularly Polarized Metaline Antenna

A short metaline composed of a small number of unit cells, N
_cell
, is investigated. One end of the short metaline is excited and the other end is terminated using a resistive load. The analysis reveals that the metaline radiates a circularly polarized (CP) wave. It is found that a current with a negative propagation phase constant along the metaline generates a tilted CP radiation (a) beam in the backward direction, even when N
_cell
=2.