Radial Component of the Electric Field for a Monopole Phased Array AntennaFocused in the Near Zone

摘要

The near-zone radial and principal spherical components of the electric field fora linear phased array antenna that is focused at one to two aperture diameters in the near zone are investigated. The phased array antenna, consisting of thin monopole elements, is analyzed by using the method of moments. A theoretical formulation is described and computer simulation results are presented. The results show that the radial component is negligible in the focused near-field region, which allows the principal component to be accurately computed from knowledge of only the tangential electric field on the focal plane.