针对目前关于双偏置反射面天线的无遮挡形式口面场分布函数的研究较少的情况,研究了赋形双偏置天线的几何参数变化对口面场分布的影响,进而深入分析了口面场分布对辐射方向图的影响。针对平方公里阵天线（Square Kilometer Array,SKA）高效率低旁瓣的要求,提出了一种改进型余弦口面场分布函数。计算结果表明,天线第一旁瓣电平低于-20 dB,天线效率高于85%。%As there are few researches on non-block aperture field distribution functions of the dual-offset reflector antennas,this paper studies the effect of geometric parameters on aperture field distribution and aperture field distribution on radiation pattern.According to the requirement of high efficiency and low side-lobe level of the Square Kilometer Array,this paper proposes a kind of improved cosine aperture field distribution function.The calculating results indicate that the first side-lobe level is less than-20dB,and the efficiency is higher than 85%.
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