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本文用几何绕射理论分析计算了矩形反射柱体近旁偶极子和双环天线的水平辐射特性。研究了到达场点的直达波、反射波和柱体稜边各次绕射波之间的量值关系。分析了柱体边长、天线与柱体之间的相对位置和天线的馈电方式对合成场强方向图的影响。计算结果表明,需要对天线系统的有关参数进行优化设计,以得到最佳的全向辐射特性,本文的分析方法和结果为这类天线系统的优化设计提供了手段和依据。
In this paper, the geometrical diffraction theory is used to analyze the horizontal radiation characteristics of the dipole near the rectangular reflector and the double loop antenna. The relationship between the direct wave, the reflected wave and the diffracted waves at the edge of the cylinder is studied. The influence of the side length of the cylinder, the relative position of the antenna and the column and the feeding mode of the antenna on the resultant field strength pattern is analyzed. The calculation results show that it is necessary to optimize the relevant parameters of the antenna system to obtain the best omnidirectional radiation characteristics. The analysis methods and results in this paper provide the means and basis for the optimization design of the antenna system.