球面波垂直入射下圆形口径面的轴向绕射场分析  

Axial Direction Diffracted Field Analysis of Circular Aperture with Vertical Incidence of Spherical Wave

作　　者：李斌颖[1] 张冠茂[1] 齐海州 冉崇书 

机构地区：[1]兰州大学电子与信息科学系

出　　处：《兰州大学学报（自然科学版）》1998年第4期61-68,共8页Journal of Lanzhou University(Natural Sciences)

摘　　要：基于惠更斯—费涅尔原理，利用基尔霍夫公式给出了球面波垂直入射下理想导体面上圆形口径面的轴向场解析表达式，从而严格精确地解决了其轴向近场的求解问题．根据经典解析方法并辅以数值计算手段，给出口径面在几种不同归一化尺寸下的轴向场分布图．此外还探讨了口径面尺寸对轴向定点场强大小的影响，发现在给定的轴向点，将存在一系列使该点场强取极大值的口径尺寸，其中第一个解是最佳的．最后给出求解最佳尺寸的一组通用公式．Based on Huygens Fresnel Principle and Kirchhoff formula, an analytical expression of the axial direction diffracted field close to a circular aperture which lies in an infinite ideal conductor plane, with vertical incidence of spherical wave, is derived without any approximation. Not only several |E pi |～R 0 curves at a fixed point in the axial direction but several |E pi |～h 0 curves with the size of aperture fixed are presented as well. The conclusion is that an optimal size of the aperture which makes the field intensity of a fixed point in the axial direction reach its maximum can always be found. A group of general formulae to calculate the optimal size are also provided.

关 键 词：绕射场 垂直入射 球面波 圆形口径面 天线 

分 类 号：TN82[电子电信—信息与通信工程]