Rectangular tapered polyrod antenna

Image of the Rectangular tapered polyrod antenna.

Dielectric-rod antennas, also known as Polyrod antennas, are regarded as a type of surface-wave antenna. While a wide range of configurations are possible for dielectric-rod antennas, in most cases they have a tapered rod of circular or rectangular cross section. This particular implementation has a rectangular cross-section and a sectional taper in the E-plane only. The feeding waveguide couples part of the input power into a surface wave which travels along the dielectric rod with minimal reflection. The surface wave then continuously radiates as it travels along, gradually transforming from a strongly bounded wave to a free-space wave.

Typical pattern performance of the rectangular tapered polyrod.
Typical S11 performance of the rectangular tapered polyrod.