Nearfield Vs Farfield in FEKO

Hi all
I want to calculate the the scattered E-Field in FEKO. I define the Nearfield request at distances from r_0 to r_m which really some of them are in Farfield range. when the sample closed to Farfield region the scattered E-fields converge to 1. I test it for other structure and see itfor all of them. why this happens? how can I solve that?
I want to compare this result by Farfield RCS result.