Resonant phenomena at diffraction of tilted impedance dipole field on finite size screen

Abstract

The 3D radiation patterns of the tilted impedance wire dipole located over a perfectly conducting infinitely thin finite size screen are investigated by the uniform geometric diffraction theory method. The technique is developed for definition of a slope angle of the wire dipole taking into account the diffraction effects on the screen edges at which the circularly polarized wave in the set directions of the main observation planes in the far zone is radiated. The extremely achievable field amplitude of the circularly polarized wave in the certain angles of the main observation planes as well as the appropriate dipole's slope angles depending on the square screen sizes are defined. It is shown that the resonant phenomena take place on account of diffraction effects on screen edges. At certain dipole's spacing the radiation intensity in case of exiting screen by a resonant impedance dipole more than twice exceeds intensity in case of exiting screen by ideally conducting dipole with the same length.