| Adaptive Nulling in the antenna pattern at the desired location was done using different techniques, which include the introduction of metal and dielectric flaps at the edges of the reflector antenna, flat and curved metal plates moving in and out of the surface of the reflector, deformation of the surface of the reflector, varying the dielectric constant of part of the reflector, and changing the amplitude and phase of the individual elements of the array used as a feed for the reflector. FEMLAB is a MATLAB-based time domain finite element program used in this project. The continuous parameter genetic algorithm performed the adaptation. By using the genetic algorithm, the physical characteristics of the reflector antenna were changed in order to get the desired reduction in the electric field pattern. |
