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在现代雷达应用中,研究具有深零位方向图的天线是目前国际上对付敌方的干扰或地面上障碍物的干扰所采用的重要手段之一。国内对这方面的研究甚少。因此,这个问题的研究是具有重要意义的。本文根据远区方向图与它们的零点及口径分布或单元激励之间的关系,对线源天线和线阵天线提出一种仅修改一些方向图的零点,便可产生深零位的方法。研究了如何修改零点的问题,修改后的方向图的口径分布或单元激励是如何变化的,以及口径分布或单元激励的误差对深零位方向图的影响。研究结果表明:这种方法直接、简单,并且具有一定的稳定性。要产生具有深零位的方向图只需修改边缘的单元激励,其修改量约为总单元个数的六分之一以上。
In modern radar applications, studying antennas with deep zero bitmap is one of the most important means to deal with enemy interference or obstacles on the ground at present. Domestic research on this area is scarce. Therefore, the study of this issue is of great significance. Based on the relationship between the far-field patterns and their zeros and caliber distribution or cell excitation, this paper presents a method for generating line-source antennas and line-array antennas by modifying only the zero points of some patterns to generate a deep null. The problem of how to modify the zero point, how the caliber distribution of the modified pattern changes or how the unit excitation changes, and how the error of the caliber distribution or unit excitation affects the depth map are studied. The results show that this method is direct, simple and has some stability. To produce a pattern with a deep zero bit, simply modify the edge of the unit excitation, the amount of modification is about one sixth of the total number of units.