Circularly polarized receiving antenna systems with zero backscattering

This paper discusses small helical antennas, and their uses in creating zero-backscattering Huygens´ antennas. By using two orthogonal helical antennas, a Huygens´ antenna for circular polarization can be formed. This kind of an antenna does not backscatter but directs the scattered power away from the incidence direction, when that direction is perpendicular to the axes of the helices. The antenna is complemented with a third helix, thus creating an isotropic antenna system with the same properties.