%0 Journal Article %T Unconditionally Stable Leapfrog Adi-FDTD Method for Lossy Media %A Theng Huat Gan %A Eng Leong Tan %J PIER M %D 2012 %I EMW Publishing %R 10.2528/PIERM12090307 %X This paper presents an unconditionally stable threedimensional (3-D) leapfrog alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method for lossy media. Conductivity terms of lossy media are incorporated into the leapfrog ADI-FDTD method in an analogous manner as the conventional explicit FDTD method since the leapfrog ADI-FDTD method is a perturbation of the conventional explicit FDTD method. Implementation of the leapfrog ADI-FDTD method for lossy media with special consideration for boundary condition is provided. Numerical results and examples are presented to validate the formulation. %U http://www.jpier.org/pierm/pier.php?paper=12090307