This example illustrates the ability of XFDTD 6 to import CAD files, manipulate them, apply sources and make SAR calculations.

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  Figure 11

The SAR results are validated by comparison with measurements made by APREL Laboratories. First the XFdtd 3D Solid CAD Importation Module is used to import the CAD model of APREL Laboratories Universal Phantom. Figure 1 shows the actual UniPhantom, and Figure 2 shows the imported CAD file in the XFdtd Mesh Window. The tissue simulation liquid material (light blue) can be added to the phantom interior by manipulation in XFdtd using Boolean functions to separate the various CAD lumps. This process is shown in the sequence of XFdtd geometry views in Figures 3, 4, and 5. The final XFdtd geometry with the tissue simulation liquid filling the interior of the phantom is shown in Figure 6. Tissue simulation parameters of conductivity, permitivity and density are defined and a cylindrical dipole antenna is added to complete the geometry of this SAR measurement configuration shown in Figure 7. The dipole antenna was excited using a steady state sinusoid frequency centered at 835MHz to calculate electric field distribution and local SAR values within the tissue equivalent liquid as shown in Figures 7 and 8. Figures 9 and 10 show the 3D solid mesh rotation and screen shot capabilities of the XFdtd user interface. Using this model a sequence of XFdtd calculations was performed. The XFdtd results were compared with the APREL laboratories ALSAS measurement system. The comparisons are summarized in Figure 11 and show excellent agreement. Analysis and measurements provided by Daniel Brooks of APREL Laboratories, http://www.aprel.com.