Abstract:

A hybrid technique that combines the moment methods (MoM) with the uniform geometrical theory of diffraction (UTD) is presented. The method can accurately and efficiently compute the radiation pattern of an antenna array located near an electrically large platform. An optimization process based on the genetic algorithm(GA) is used to produce a desired radiation pattern. Usefulness of the proposed technique is shown by an example of a ten-element half-wavelength dipole array placed close to a finite-length PEC circular cylinder. Amplitude and phase of the element excited voltage are optimized using the method. Compared to other methods, the optimization technique based on GA and MoM-UTD is effective and accurate, and has high performance.

Key words: moment methods, uniform geometrical theory of diffraction, genetic algorithm, pattern synthesis