Focal field distribution of Fresnel zone plate antennas

With the arrival of high power direct broadcasting satellites, there is an increasing demand for low-cost, environmentally unobtrusive antennas. An interesting candidate in this respect is the improved Fresnel zone plate, on which research is being carried out at the University of Bradford in collaboration with Mawzones Ltd. A theoretical study on the focal field distributions of the simple Fresnel zone plate (FZP) antenna and its phase-correcting versions is reported