The paper proposes an electromagnetic-wave beam-scanning antenna system using a
simple rotation of a pair of near-field graded-dielectric plates (GDPs). The antenna system
requires an electromagnetic (EM) illuminator, with nearly symmetric aperture field
distribution, as the base antenna and two types of GDPs: one radially graded dielectric
(RGD) and two linearly graded dielectric (LGD) plates. The RGD first focuses the beam of
the base antenna in the broadside direction, and the LGD then tilts the focused beam at an …