</table>
With the sphere tool selected, click at the origin (0,0,0) of the project workspace to start your drawing, and drag the mouse to draw a sphere. Set the '''Radius''' of the sphere to R = 600mm. When you drew a very large object, it may full up the entire screen. You can zoom to fit your structure into the screen using the keyboard shortcut <b>Ctrl+E</b> or by clicking the Zoom Extents [[Image:fdtd_zoomextents.png]] button of View Toolbar.
Note that at the center frequency f<sub>o</sub> = 1GHz, the operating wavelength is λ<sub>0</sub> = 300mm, and your sphere has a diameter of 4λ<sub>0</sub>.