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Three-dimensional power loss distributions general- S inside the human body by the electromagnetic india- lion (roan a waveguide-type applicator are analyzed using the finite-difference time-domain (FD-TD) method. To execute the three-dimensional FD-TD analysis with a small amount of computation, only a limited small muscular region representing a past of the human body near the waveguide aperture is employed in the analysis region. In this case, the external boundaries of the analysis region are located in the human body which is cornposed mostly of lossy media. Thus the conventional absorbing boundary conditions often are not applied effectively. In this paper, new absorbing boundary conditions are proposed so that the FD-TD analysis can be executed as accurately as possible even if the external boundaries of the analysis region are located in lossy media. The waveguide-type applicator, with which the human body is heated, is assumed to be filled with water and the radiated electromagnetic wave is assumed to be excited by the electric current on & post. To represent the electric current source on the post, the following two types of formulation method also are presented: 1) a method representing the electric current as the electric field source; and 2) the magnetic field source. Both methods are proved numerically to be valid. [ABSTRACT FROM AUTHOR]