RADIO PHYSICS AND RADIO ASTRONOMY

PACS number: 07.57.-c 

Purpose: The conditions for formation of a wave with circular polarization and extremely achievable field density amplitude in the set directions of the main observation planes in the far zone, radiated by the oblique impedance wire dipole located over the rectangular perfectly conducting screen are determined.

Design/methodology/approach: To solve the 3-D vector problem of diffraction of a field of arbitrarily oriented impedance thin wire dipole on the perfectly conducting rectangular screen the uniform geometric theory diffraction method is applied, and the asymptotic expressions for an electric current of the horizontal impedance wire dipole with electrical length 0.4 ≤ 2l/λ ≤ 0.6 are used.

Findings: The dipole’s slope angles at which the wave with equal amplitudes of orthogonal components of the electric field vector is radiated, and also the corresponding to them ellipticity coefficients and normalized squared absolute values of the electric field vector as functions of the observation angles and the distance between dipole and screen are calculated accounting for the diffraction effects on screen edges.

Conclusions: The technique is developed for determination of an impedance wire dipole slope angle with account for the diffraction effects on screen edges at which the circularly polarized wave is radiated. It is shown that by the choice of an appropriate slope angle and distance of the resonant impedance wire dipole from the screen, the circularly polarized radiation with extremely achievable intensity in the given direction in one of the main observation planes can be realized.

Key words: rectangular screen, surface impedance, resonant wire dipole, wave, circular polarization, ellipticity coefficient, field amplitude

Radio phys. radio astron. 2016, 21(3): 216-230 

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