Superdirectivity for coupled dimers of meta-atoms at MHz

摘要

It was recently shown that arrays of coupled meta-atoms, capable of carrying slow short-wavelength magneto-inductive waves, are promising candidates for realizing rapidly varying current distributions required for superdirectivity. Superdirective end-fire radiation was confirmed for metamaterial dimers in the GHz range. In this paper we present a theoretical study of metamaterial dimers in the MHz range. We show that the conditions of superdirectivity differ significantly from the case of the GHz elements. We identify superdirective configurations of dimers of meta-atoms of various shape, resonant characteristics and separation. This study paves the way for further work on superdirective metamaterial metasurfaces.