Abstract: Radome is an important part of missiles and other aircraft, and its electrical performance directly determines the guidance accuracy and distance of action of missiles. In this paper, the cone radome which is the typical shape is designed for simulation and optimization of the top region. The geometric model of the cone radome is built and the key dimensions parameters are determined. According to the relevant electrical performance parameters and the incidence angle distribution of composite materials, the radome is designed with the half-wave thickness initially. Based on the FEKO simulation platform, MOM is used to simulate the model with MLFMM, and the transmission coefficient of radome in different scan angle states in pitching direction is obtained with the change of the top region's thickness. The analysis found that the transmission coefficient of the radome showed a cyclical downward trend with the increase of the thickness of the top region. Changing the outer diameter of the ball head of the radome and the angle of the cone, the law of electrical performance change is basically consistent in general. However, the larger the increase of the outer diameter of the ball head, the larger the scanning angle range affected by the thickness of the top region. The change of the cone angle affects the range of the top region thickness with optimal transmission coefficient. Based on the law of electrical performance change, the top region of cone radome is optimized. By analyzing the law of electrical performance change, the optimization direction is proposed and the technical support is provided. The paper is of some reference and guiding significance in radome design field.

Key words: radome, electrical performance, MOM, MLFMM, composites