Surface Impedance Boundary Conditions of High Order of Approximation for the Finite Integration Technique
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Surface Impedance Boundary Conditions of High Order of Approximation for the Finite Integration TechniqueAbstract
Time domain Surface Impedance Boundary Conditions (SIBCs) of high order of approximation relating the electric field integral along the edge of the computational cell and the magnetic flux through its facet are derived and implemented into the Finite Integration Technique (FIT). It enables such effects as curvature of the conductor surface and variation of the electromagnetic field along the interface to be accurately described in the formulation. As a result, accuracy of numerical results is improved and the application area is expanded as compared with formulations employing classical low order Leontovich SIBCs. Numerical results obtained using low- and highorder FIT-SIBC formulations are compared with analytical results to demonstrate the advantages of the proposed approach.
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