摘要
导出了任意旋转凹曲面天线的散射场计算公式。单反射面的镜面场由几何光学法(GO)得到,非轴向绕射场由一致性绕射理论(UTD)得到,轴向绕射场由等效电磁流法得到。对于卡塞格伦等型式的双反射器天线,总散射场应该是主、副面绕射场,副面镜面场和反射绕射场等各项的相位相加。文中给出了某些天线单站散射截面(RCS)的计算和实验结果。这种方法很容易推广到双站情况。
The scattered field formulas for an arbitrarily curved concave single-reflector antenna are derived.Geometrical optics is utilized to obtain the specular fieldand the uniform geometrical theory of diffraction is used to obtain the diffracted field forobservers away from the axis,and the method of equivalent electric and magnetic currentsfor the axial observers in caustic region.For a dual-reflector,such as Cassegrain antenna,the total scattered field should be the phase summation of the diffracted and reflected fieldsfrom the mainreflector and subreflector.Some calculated and measured results of radarcross section for typical antennas are given.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
1990年第5期519-526,共8页
Journal of University of Electronic Science and Technology of China
基金
电子科学研究院和南昌飞机制造公司提供经费资助
关键词
反射器天线
天线
散射截面
antenna
radar cross section
electromagnetic scattering
