一、前言天线罩中的表面波是造成带罩天线方向图畸变的原因之一,是设计人员必须考虑的重要因素。尽管曾有文献讨论过,但由于缺乏具体的数学推导,我们还是难以理解表面波在天线罩中的激励机理。本文运用最速下降法,导出了表面波的产生条件、场强表达式,由此可以比较清晰地了解表面波的激励情况。最后,结合天线罩的工程设计,讨论了如 I. Introduction The surface wave in the radome is one of the causes of the distortion of the antenna pattern with the shrouded antenna. It is an important factor that the designer must consider. Although discussed in the literature, it is difficult to understand the excitation mechanism of surface waves in a radome due to the lack of specific mathematical derivation. In this paper, the steepest descent method is used to derive the surface wave generation conditions and the field strength expression, so that the surface wave excitation can be clearly understood. Finally, combined with radome engineering design, discussed for example