Hybrid lower- and higher-order basis functions on mixed triangle and NURBS model

A novel implementation of combining lower-and higher-order basis functions (LHOBF) is presented. Analysis of antennas in complex environment or mounted on large platform is a popular problem in electromagnetic compatibility (EMC) study. Lower-order basis functions (LOBF) can well describe the small features of antenna, which are defined on segments, triangles and wire-surface junctions; however, a great number of unknowns yielded as result. Higher-order basis functions (HOBF) with NURBS (Non-Uniform Rational B-Spline) model are efficient to model the complex environment or large platform with fewer unknowns and good accuracy, but it's not convenient to model the small feature of antennas. So hybrid LHOBF takes the advantages of the LOBF and HOBF, which can provides a feasible way to simulate antennas with complex environment or large platform much accurately, meanwhile, the number of unknowns is greatly reduced.