  An antenna prototype utilizing artificial impedance surfaces to control the
near field distribution is described. The antenna is a folded dipole placed
above a finite-size artificial impedance surface. We have found that the field
screening is most effective if the surface is a metal conductor. However, to
achieve a reasonable value of the radiation resistance the dipole should be
located far off the screen. If the surface is a magnetic wall, the antenna
design is more compact, but the field behind the screen is large. Here we
realize a compromise solution using an inductive surface of a moderate surface
impedance, which allows realization of an effective near-field screen with
still a reasonably low-profile design.
