THE STANDARD IMPEDANCE BOUNDARY-CONDITION MODEL FOR COATED CONDUCTORSWITH EDGES - A NUMERICAL INVESTIGATION OF THE ACCURACY FOR TRANSVERSEMAGNETIC-POLARIZATION

The standard impedance boundary condition (SIBC) does not constitute a n exact model of material coated perfect conductors with edges but may provide sufficient accuracy for engineering purposes. A numerical inv estigation of the SIBC accuracy is carried out for coated wedges and c oated square cylinders for the case of transverse magnetic (TM) illumi nation. The numerical investigation reveals that although the SIBC mod el is less accurate for structures with edges than for planar structur es, it remains applicable for a wide range of engineering problems. He nce, the TM far field from a large class of coated conductors with edg es can be accurately predicted using the SIBC model.