Unidirectional RF antenna by stacked spoof surface plasmon resonators

In wireless communication and nanophotonics systems, antennas play a very important role due to their abilities to emit and collect electromagnetic waves (EMWs) and emission/scattering direction control is of crucial importance. We propose a RF unidirectional scattering antenna consisting of spoof localized surface plasmon resonances. The principle is based on the fact that cylindrical metal surfaces corrugated by grooves can support both magnetic dipole modes and electric dipole modes [1, 2]. By adjusting the geometric parameter of the composite structure, we can put the magnetic and electric dipole resonances together in the spectrum which gives rise to unidirectional scattering. Such behavior is similar to the Kerker's-type scattering by hypothetic magneto-dielectric particles predicted theoretically three decades ago [3]. We achieve strong directional microwave scattering in the forward direction and nearly zero backscattered fields.