Distribution of reactive power density in the near-field region of aperture antennas with different illumination laws

The thorough investigation of the distribution of electromagnetic radiation in the near-field reactive region of square aperture with different amplitude illumination laws was carried out. It has been shown, that extension of reactive field region significantly depends on the illumination law especially for small radiators. The ratio between the reactive and active power density has been calculated and analyzed at different planes in near-field region as well as along the axis normal to radiator aperture. It has been shown that, the reactive component of power flux density was absent in all planes of observation in sections |x|=|y| for the uniform amplitude distribution. The pattern of the spatial distribution of reactive power component is symmetric with respect to sections |x|=|y|.