Null Steering in Failed Antenna Arrays
Antenna array pattern nulling is desirable in order to suppress the interfering signals. But in large antenna arrays, there is always a possibility of failure of some elements, which may degrade the radiation pattern with an increase in Side Lobe Level (SLL) and removal of the nulls from desired position. In this paper a correction procedure is introduced based on Particle Swarm Optimization (PSO) which maintains the nulling performance of the failed antenna array. Considering the faulty elements as non-radiating elements, PSO reoptimizes the weights of the remaining radiating elements to reshape the pattern.