===Defining The Far Field Box===
[[Image:FDTD116.png|thumb|250px350px|[[FDTD Module]]'s Radiation Pattern dialog]][[Image:fdtd_out26_tn.png|thumb|400px350px|The 3D total radiation pattern of a dipole antenna: polar type.]]
For any far field calculations in [[EM.Cube]], first you have to define a far field observable in the Navigation Tree. In [[FDTD Module]], defining a far field observable also initiates a far field box in the computational domain. This box is used to perform the near-to-far-field transformation at the end of an FDTD simulation. To insert a new far field box, follow these steps: