Abstract
The horizontal radiation patterns of dipoles and double-loop antennas near a rectangular cylinder reflector are calculated and analyzed by the geometrical theory of diffraction (GTD). The magnitudes of the direct field, the reflected field and the diffracted field at a field point are studied. The effects on the resultant field pattern of the size of the reflecting cylinder, of the relative position between the antennas and the reflecting cylinder, and of the methods of feeding of antennas are analyzed. The results obtained show that in order to obtain the optimum omni-directional characteristics of rediation, the optimum design for the parameters of antenna system is needed. The method and results in this paper provide means and bases for the optimum design of this kind of antenna system.
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