圆口径天线聚焦特性的研究  

Properties of Focused Circular Aperture Antennas

作　　者：邓扬建[1] 赵愉深[1] 林为干[1] 

机构地区：[1]成都电子科技大学应用物理所

出　　处：《电子科技大学学报》1995年第4期373-378,共6页Journal of University of Electronic Science and Technology of China

基　　金：电子部预研基金

摘　　要：对聚焦圆口径天线的近轴场进行计算。利用分部积分法导出了圆口径天线近轴聚焦（辐射）场的通用解析表达式。焦平面具有和远区完全相同的场表达式，焦斑包含了占总辐射功率４７％的能量传输，焦距越小焦班越小，能量也就愈集中。对振幅均匀和坡变分布的圆口径天线聚焦特性作数值计算并相互比较，总结聚焦特性。This peper deals with the calculation of near-axis electric field distribution of focused circularaperture antennas. General near-axis field expression is obtained with the analysis of integration by part.Theexpressions developed for a focused aperture in the focal plane are identical with that for the Fraunhofer region ofan unfocused aperture. 47% of the total energy radiated is confined within the focal spot.The smaller the focallength,the more concentrated,the more concentrated the field.Numerical results of a focus circular results of a focus circular aporture with uniform amplitude andtapered amplitude are compared and focused properties are summarized.

关 键 词：聚焦 焦平面 菲涅耳区 口径天线 振幅坡变 

分 类 号：TN827.5[电子电信—信息与通信工程]