Improving antenna near-field pattern by use of artificial impedance screens

Details Improving antenna near-field pattern by use of artificial impedance screens Improving antenna near-field pattern by use of artificial impedance screens

2005-04-18

arxiv.org/abs/physics/0504123v1

Physics

Classical Physics

10 pages, 12 figures, 3 tables

Scientific paper

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.

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