Title :
A boundary condition to absorb both propagating and evanescent waves in a finite-difference time-domain simulation
Author :
Betz, Vaughn ; Mittra, Raj
Author_Institution :
Electromagn. Commun. Lab., Illinois Univ., Urbana, IL, USA
fDate :
6/1/1993 12:00:00 AM
Abstract :
A boundary condition that absorbs both propagating and evanescent waves in a finite-difference time-domain (FDTD) simulation is presented. A computationally efficient method of determining the values of the boundary condition input parameters is described. To illustrate the effectiveness of this boundary condition, it is used to truncate the computational domain of two FDTD simulations, namely a uniform microstrip line and a microstrip line with a gap discontinuity. In both cases, the results are found to be more accurate than those obtained with the conventional second-order Mur absorbing boundary condition.<>
Keywords :
finite difference time-domain analysis; microstrip lines; simulation; waveguide theory; FDTD simulations; absorbing boundary condition; boundary condition input parameters; evanescent waves; finite-difference time-domain; gap discontinuity; propagating waves; uniform microstrip line; Boundary conditions; Computational modeling; Dielectrics; Finite difference methods; Integrated circuit modeling; Microstrip; Microwave integrated circuits; Microwave theory and techniques; Time domain analysis;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
