Title :
Lossy dielectrics in FDTD
Author :
Luebbers, Raymond
Author_Institution :
Dept. of Electr. & Comput. Eng., Pennsylvania State Univ., University Park, PA, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
The finite-difference time-domain (FDTD) method easily includes materials with constant values of permittivity and conductivity. However, most lossy dielectrics are described over a band of frequencies by a constant complex permittivity. For a transient FDTD calculation, constant real permittivity and conductivity values provide a poor approximation for such a material. Frequency-dependent FDTD can provide a better approximation to a constant complex permittivity over a band of frequencies. The article provides a simple approach for determining the calculation parameters and illustrates the resulting improvement in accuracy
Keywords :
electrical conductivity of solids; finite difference time-domain analysis; permittivity; waveguide theory; FDTD; accuracy; calculation parameters; conductivity; constant complex permittivity; constant real permittivity; finite-difference time-domain method; frequency band; frequency-dependent FDTD; lossy dielectrics; plane wave propagation; transient FDTD; Conducting materials; Conductivity; Convolution; Dielectric losses; Dielectric materials; Finite difference methods; Frequency; Nonlinear equations; Permittivity; Time domain analysis;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
