Abstract :
The technique of surface impedance boundary condition (SIBC) can avoid calculating the fields inside conductor and the results have been proved valid under certain conditions. More recently, some authors studied the surface impedance of a lossy dielectric with exponential approximation (J.G. Maloney and G.S. Smith, IEEE Trans. Antennas Propagat., vol. 40, pp. 38-48, 1992), with a first-order rational approximation series expanding (K.S. Oh and I.E. Schutt-Aine, ibid., vol. 43, no. 7, pp. 660-666, 1995), or with a higher order SIBC (M.K. Karkkainen and S.A. Tretyakov, ibid., vol. 51, pp. 2448-2455, 2003) for a time domain model. Their obtaining is in good agreement with exact result for a large value of conductivity, normal incident angle, etc. However, the content of their research contains only unilateralism. This investigation is performed a full time-domain implementation of the SIBC model by expanding the exact operational surface impedance accompanying a suitable rational approximation. The algorithm is valid for problems in areas in which we are interested such as small conductivity, incident angle, and polarizations.
Keywords :
boundary-value problems; computational electromagnetics; electromagnetic field theory; finite difference time-domain analysis; function approximation; rational functions; surface impedance; time-domain analysis; FDTD; conductivity; conductor internal fields; exact operational surface impedance; expanding first-order rational approximation series; exponential approximation; full time-domain SIBC model implementation; high order SIBC algorithm; lossy dielectric; normal incident angle; polarizations; rational approximation; surface impedance boundary condition; time domain model; unilateralism; Boundary conditions; Conductivity; Dielectric losses; Finite difference methods; Instruments; Maxwell equations; Polarization; Surface impedance; Tellurium; Time domain analysis;
