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.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
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
关键词
聚焦
焦平面
菲涅耳区
口径天线
振幅坡变
focusing
focal plane
Fresnel region
aperture antennas
amplitude taper
