An aperture antenna with uniform field generates the ripples of the field intensity in its non-far region and potentially causes deterioration of BER in communication system. In this paper, we propose a method to design the field distribution of a rectangular aperture using Hermite-Gaussian mode expansion and a circular one using Laguerre-Gaussian mode expansion.
Design of the Amplitude Distribution of an Antenna Aperture using Gaussian Mode Expansion in order to generate the Uniform Field Intensity in the Non-far Region