复射线理论应用于天线一体化设计

Application of complex ray theory on antenna incorporate design

分析自由空间天线辐射特性的方法已十分成熟,如口径场积分法、平面波谱积分法等,它们大都是行之有效的,但要求对天线及天线罩进行一体化分析时,现有的经典方法往往不能迅速而准确地给出解答,如果用复射线理论这一新方法则可以对某些问题圆满地给出结果。根据复射线理论,利用复源点远场具有的高斯波束特性,无论是在远区或是近轴区域内,复源点场和高斯函数有很接近的相同分布,理论上论证了对于具有高斯波束分布的口径场可以用复源点场来近似模拟。

In this paper, antenna pattern and simulation methods are introduced, and complex ray theory （CRT） is discussed in detail. Then, it analyses the pattern of antenna will radome. Multilayer radome exerts a tremendous influence on low sidelobe antenna pattern. The Gaussian beam radiated by complex source point （CSP） is used to simulate the mainlobe and sidelobes of low sidelobe antenna. Then, the mulfireflection and transmission of all CSP fields are added at the far zone. It＇ s proved that the Gaussian beam radiated could be imitated by CSP field in theories.