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Far field estimation by current distribution reconstruction from 5-sided box near field

This paper presents how to reconstruct the current distribution of the antenna using a near field of the 5-sided box. It is difficult to measure the phase of the near field in the high frequency band. The proposed method is an inverse problem using near field amplitude and can estimate the far field accurately, by using initial phase information. The information is determined by phase delay due to the distance between the feeding point and measurement point, considering antiphase of z plane of the box.