Radar cross section of arbitrary polished spheres at terahertz frequencies  

作　　者：Ruijun Wang Bin Deng Hongqiang Wang Yuliang Qin 

机构地区：[1]College of Electronic Science and Engineering,National University of Defense Technology,Changsha 410073,China [2]Uint 95876 of PLA,Zhangye 734100,China

出　　处：《Journal of Systems Engineering and Electronics》2017年第6期1072-1077,共6页系统工程与电子技术（英文版）

基　　金：supported by the National Science Fund for Young Scientists of China(61302148;61571011)

摘　　要：We develop an efficient method for polished metallic sphere’s scattering prediction in terahertz band when its frequency dispersion property is considered. By deducing scattering solution of the lossy metallic sphere, the radar cross section(RCS)of different metallic spheres is given at terahertz frequencies. The investigation of the RCS of polished metallic spheres shows the normalized RCS is always same to the metals’ normal incidence reflectivity when the sphere becomes electrically large. The metals which have high reflectivity(such as Al, Cu, Ag and Au) show that the corresponding RCS of the spheres is almost πa2 in terahertz band. The sphere’s RCS of the transition metal such as Fe begins to decrease obviously since the far infrared.We develop an efficient method for polished metallic sphere's scattering prediction in terahertz band when its frequency dispersion property is considered. By deducing scattering solution of the lossy metallic sphere, the radar cross section(RCS)of different metallic spheres is given at terahertz frequencies. The investigation of the RCS of polished metallic spheres shows the normalized RCS is always same to the metals' normal incidence reflectivity when the sphere becomes electrically large. The metals which have high reflectivity(such as Al, Cu, Ag and Au) show that the corresponding RCS of the spheres is almost πa2 in terahertz band. The sphere's RCS of the transition metal such as Fe begins to decrease obviously since the far infrared.

关 键 词：TERAHERTZ radar cross section(RCS) SPHERE Drude model frequency dispersion 

分 类 号：TN95[电子电信—信号与信息处理]