Title :
Modeling of Lossy Curved Surfaces in 3-D FIT/FDTD Techniques
Author :
Makinen, Riku M. ; De Gersem, Herbert ; Weiland, Thomas ; Kivikoski, Markku A.
Author_Institution :
Inst. fur Theorie Elektromagnetischer Felder, Technische Univ. Darmstadt
Abstract :
A conformal first-order or Leontovic surface-impedance boundary condition (SIBC) for the modeling of lossy curved surfaces in a Cartesian grid is presented for the finite-integration technique (FIT). Equivalently, the model can be derived using the contour-path formulation of the finite-difference time domain (FDTD) method. The SIBC is based on a lumped-element representation of the impedance combined with a conformal modeling scheme. The validity of the proposed model is evaluated by investigating the quality factors of rectangular, cylindrical and spherical cavity resonators. The convergence rate of the conformal SIBC model is shown to be of second order
Keywords :
absorbing media; cavity resonators; electromagnetic fields; electromagnetic wave absorption; finite difference time-domain analysis; surface impedance; Cartesian grid; FDTD; FIT; Leontovic surface-impedance boundary condition; SIBC; cavity resonator; conformal modeling scheme; contour-path formulation; finite-difference time domain method; finite-integration technique; lossy curved surface modeling; lumped-element representation; Boundary conditions; Conducting materials; Conductors; Dielectric losses; Finite difference methods; Magnetic fields; Permeability; Surface fitting; Surface impedance; Time domain analysis; Finite-difference time-domain (FDTD) methods; losses; resonators;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2006.884212
