Chou H.-TGao W.-JZhou JYou BHe X.-H.HSI-TSENG CHOU2021-09-022021-09-0220210018926Xhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85102263925&doi=10.1109%2fTAP.2020.3026878&partnerID=40&md5=81ea5fadfe0f9569080a0f183c9a37d0https://scholars.lib.ntu.edu.tw/handle/123456789/580856The analysis of electromagnetic (EM) scattering from a target located in the near zone of an electrically large near-field-focused (NFF) array of antennas is presented. The analysis first examined the EM scattering from a metal sphere, attempting to create a reference for comparison with other targets in a fashion analogous to conventional far-field analysis of radar cross section (RCS). Realistic targets were afterward examined and analyzed to exhibit their RCS characteristics. A numerical simulation-based maximization of EM scattering fields for effective target detection in the near zone of antenna was developed, which allows one to obtain a set of optimum element excitation weightings by applying the steepest ascent method (SAM). RCS phenomena were validated by full-wave simulations and experimental measurements to justify the feasibility of the proposed concept. ? 1963-2012 IEEE.Electromagnetic wave scattering; Numerical methods; Radar antennas; Radar cross section; Electrically large; Electromagnetic scattering; EM scattering; Far field analysis; Full-wave simulations; Metal spheres; Near fields; Phased array antennas; Antenna phased arraysjournal article10.1109/TAP.2020.30268782-s2.0-85102263925