Numerical Evaluation of Antennas Field using a New Aperture-Like Expansion

This paper deals with a new aperture-like expansion of the field scattered by a reflector antenna, which allows to reconstruct the field radiated by such an antenna starting from a limited number of computed values, essentially one per lobe. This values, in turn, are exact Fourier transforms evaluated at the Nyquist rate, which allows an optimal use of the Fast Fourier Transform algorithm. An extensive numerical analysis has been performed, whose results are presented and briefly discussed in this note. These results show the excellent performance of the proposed method, a very appealing one from the point of view of both flexibility and computer time reduction.