Formation of circularly polarized wave by impedance wire dipole located over square screen
For a radiating system consisting of a resonant half-wave impedance oblique wire dipole and a rectangular perfectly conducting screen the conditions guaranteeing formation of a circularly polarized wave with extremely achievable field amplitude in the set directions of the main observation planes are investigated. Computation of the far field components is based on the asymptotic solution of 3D vector problem of diffraction of the field of electric dipole on the ideally conducting rectangular screen, obtained by the method of uniform geometric diffraction theory. To define a wire dipole's slope angle guaranteeing equality of the amplitudes of the orthogonal field components, the technique with account of diffraction effects on edges of the finite size screen is developed. It is shown that in defined interval of the observation angles the circularly polarized wave with extremely achievable field amplitude may be formed by a choice of appropriate wire dipole's slope angle and removal from a screen.
Polarization of wave formed by impedance wire dipole with screen depending on screen sizes
For a resonant impedance wire dipole that is inclined at the angle over a square perfectly conducting screen the conditions guaranteeing formation of a circularly polarized wave with extremely achievable field amplitude in the set directions of the main observation planes depending on the screen sizes are investigated. The asymptotic solution of the 3D diffraction problem of the field of an arbitrarily oriented impedance wire dipole on the rectangular screen, obtained by the uniform geometric diffraction theory method was used. The detailed analysis of the dipole's slope angles, the dipole's removal from the screen, at which a circular polarized wave is formed with extremely achievable field amplitude depending on the screen sizes are given. It is shown that with increasing the screen sizes the interval of angles in the main observation planes at which can be formed the circular polarization considerably increases.
Thin Impedance Vibrators - Theory and Applications
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