Directional and Polarization Patterns of Impedance Monopole Placed on Square Metal Screen

On the base of the method of the uniform geometric diffraction theory the asymptotic solution of the 3D vector problem of diffraction of the field of impedance monopole placed on the ideally conducting square screen is obtained. The fast-active algorithms and sofware for calculating the directional and polarization patterns of this radiating system are developed. For veryfication of the calculations at different screen side sizes L, the patterns of the same monopoles have been calculated using commercial software too. It is shown that for a quarter-wave monopole the radiation patterns in the main observation planes are in the good agreement at L equal to wave length, and they coincide at L equal to three wave lengths. Analysis of the field patterns and field ellipticity versus the screen sizes is carried out.