PML ABSORBING BOUNDARY-CONDITION FOR NONCUBIC CELL TIME-DOMAIN METHOD

Conventional absorbing boundary conditions (ABC's) are used for cubic- cell finite-difference time-domain (FDTD) grids, but not in noncubic c ell time-domain grids, We propose an algorithm to apply perfectly matc hed layer (PML) ABC to the noncubic cell time-domain method, The numer ical experiments are conducted of the accuracy of the PML in a regular triangle cell grid versus standard second-order Mur and PML ABC's in a square-cell FDTD grid, The PML global error is about 10(-3) of the f ormer and about three times of the latter, According to the convergent characteristics this algorithm is equivalent to that of applying PML ABC to the FDTD method.