Beam forming using a zero-phase-shift metamaterial

In this paper, we have demonstrated that a zero-phase-shift metamaterial lens structure with a concave edge and a straight edge can form a beam from a point source or focus a beam into a point. The zero-phase-shift metamaterial lens was constituted from equal-sized left-handed and right-handed square tiles and arranged in a checker-board tessellation. The left-handed tiles have an insertion phase between any two sides equal to but opposite to that of the right-handed tiles. The addition of a tapered transmission line to feed the concave edge of the lens improves the transmission and could serve as a useful component in a planar power divider.