Scattering of Toroidal Waves by Semitransparent Reflectors of Revolution in Application to Omnidirectional Antennas

Problems of radiation pattern synthesis, sidelobe suppression, or back suppression appear when using antennas with reflectors ground planes. The use a semitransparent surface allows the required shape to be synthesized efficiently through variation reflection and transmission coefficients. Effective synthesis is possible analytical formulas designed for patterns reflectors. In this article, we present model scattering toroidal wave general form by means reflector revolution. allowed us simulate various kinds axisymmetric Two asymptotic expansions were found in physical optics approximation. allow entire space determined. As an example its application, used calculate plane Archimedean two-wire spiral antenna loop above concave convex reflectors, as well slot plane. We optimal profiles perfectly conducting planes improve front-to-back ratio antennas.