• nonuniform rational B spline;
  • physics optics;
  • interpolation of critical points


A novel physics optics (PO) method based on nonuniform rational B spline (NURBS) modeling is used to calculate the disturbed pattern of an antenna around an electrically large platform.Compared with the conventional NURBS-PO method, in which the true scattered field of an antenna is replaced by the spherical wave, the new technique uses the accurate radiation field as the incident field and overcomes the limitation that the antenna must be located far away from the scatterer. In addition, the computational efficiency is significantly improved using interpolation of critical points. Two numerical examples are calculated. Compared with the results calculated by other algorithms, such as method of moments and conventional NURBS-PO, the proposed method shows great capability to solve this particular problem precisely and efficiently. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:64–66, 2012; View this article online at DOI 10.1002/mop.26467