Title :
Comparison and evaluation of boundary conditions for the absorption of guided waves in an FDTD simulation
Author :
Betz, Vaughn ; Mittra, Raj
Author_Institution :
Electromagn. Commun. Lab., Illinois Univ., Urbana, IL, USA
Abstract :
Several absorbing boundary conditions suitable for terminating the finite-difference-time-domain (FDTD) simulation of microstrip structures are compared via numerical experiments. Both a superabsorbing boundary and a modified form of Litva´s dispersive boundary condition are found to produce significantly lower reflection than the traditional first-order Mur boundary. The sensitivity of these boundary conditions to the choice of the input parameters, particularly the effective dielectric constant epsilon /sub eff/, is investigated, and optimal choices of these parameters are given.<>
Keywords :
boundary-value problems; electromagnetic wave absorption; finite difference time-domain analysis; microstrip components; FDTD simulation; Litva´s dispersive boundary condition; absorbing boundary conditions; effective dielectric constant; finite-difference-time-domain; input parameters; microstrip structures; superabsorbing boundary; Absorption; Boundary conditions; Conductors; Dielectric constant; Dispersion; Finite difference methods; Frequency; Microstrip; Reflection; Time domain analysis;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
