Title :
Ultrawideband absorbing boundary condition for termination of waveguiding structures in FD-TD simulations
Author :
Reuter, Christopher E. ; Joseph, Rose M. ; Thiele, Eric T. ; Katz, Daniel S. ; Taflove, Allen
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Northwestern Univ., Evanston, IL, USA
Abstract :
A new method for ultrawideband termination of waveguides in finite-difference time-domain (FD-TD) grids is presented. The Berenger perfectly matched layer (PML) absorbing boundary condition is applied to terminate both perfect electrically conducting (PEC) and dielectric waveguides in two dimensions. Reflections of less than -75 dB are obtained over the entire propagation regime. Evidence is presented that the PML ABC is effective even for the evanescent energy present below cutoff in PEC waveguides and the multimode propagation present in dielectric waveguides.<>
Keywords :
dielectric waveguides; finite difference time-domain analysis; waveguide theory; Berenger perfectly matched layer; FD-TD simulations; absorbing boundary condition; dielectric waveguides; evanescent energy; multimode propagation; perfect electrically conducting waveguides; reflections; two dimensions; ultrawideband termination; waveguiding structures; Boundary conditions; Dispersion; Electromagnetic propagation; Electromagnetic waveguides; Frequency; Microwave propagation; Optical propagation; Optical waveguides; Reflection; Ultra wideband technology;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
