Implementation of conductor losses in an FDTD algorithm combined with floquet boundary conditions: Application to the study of millimeter-wave resonant cavities

Frequency characteristics of plane parallel Fabry-Perot cavities with squar e aperture metal mesh mirrors are studied theoretically using the finite-di fference time-domain (FDTD) method. The use of Floquet boundary conditions enables us to reduce the size of the computational domain to one unnit peri odic volume. Metal losses are taken into account and implemented with first -order surface impedance boundary conditions (SIBCs). We show their effects on the transmission coefficient of cavities with various grid parameters a nd illuminated by a normally incident plane wave in the 60 GHz band. (C) 19 99 John Wiley & Sons.