High Order Surface Impedance in Computational Electromagnetics

Luca Di Rienzo - Dipartimento di Elettrotecnica - Politecnico di Milano


Following a short description of the development of surface impedance boundary conditions (SIBCs) and historical perspective, the seminar will focus on the applications of SIBCs in low frequency computational electromagnetics. The development will be based on Rytov's work and shows how higher order SIBCs can be developed based on perturbation analysis. The resulting SIBCs include the Leontovich and Mitzner SIBCs but also extend beyond these to include higher order terms allowing for increasingly more accurate description of the fields on curved surfaces and for variations of the fields on the surface, properties that cannot be accounted for by low-order SIBCs.
The seminar will also discuss the accuracy of SIBCs. The implementation of SIBCs in the Boundary Element Method for the computation of per-unit-length parameters of multiconductor transmission lines and for the calculation of the magnetic field near parallel conductors will be also discussed.