The antenna radiation pattern can be calculated taking into account far fields only NTF (Near to Far transformation). In many applications however near antenna fields are interesting and NTN (Near to Near) processing can be useful. User can of course create circuit which take near zone into the calculated FDTD area, however such approach can be computational ineffective because of substantially enlarging FDTD computational space and cells number hence computational time would be relatively long.
Using NTN processing user can define set of points cloud which can be arbitrary shaped in arbitrary location in space. In each point EM field will be calculated in chosen set of frequencies. User then gain much more freedom in EM calculations in space and location in contrast to FDM processing.
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NTN (Near to Near) processing
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