Near zone to far zone transformation with mixed finite-difference time-domain and frequency-domain

Near to Far zone transformation can be performed by integration of the equivalent electric and magnetic currents originating from scattered electric and magnetic fields on a surface enclosing the object. This can be done with finite difference time domain and frequency domain. In this way, near zone fields can be computed by finite difference time domain and conversion of near zone to far zone can be done in frequency domain. This method combines the accuracy of time domain in near zone and speed of computation in frequency domain to convert near zone to far zone.