Linear and Planar Antenna Array Nulling based on Schelkunoff Polynomial and Genetic Algorithm

In many aircraft and electronic warfare systems, a lot of obtrusion comes from unwanted sources, which may be noise or interfering signal. In this work, a null or multiple nulls are placed at predefined direction(s) where we have the interference while maintaining the maximum at a specific location. This is achieved through an algorithm employing the Schelkunoff nulling theory. The genetic algorithm is then used to optimize the array excitations. The proposed technique reduces the number of unknown array coefficients and hence the processing time is considerably decreased without compromising other radiation pattern specifications.