Estimation of Equivalent Current Distribution of Modulated EM Radiation Source

To take effective measures for the interference problem between electronic devices, it is important to estimate the equivalent current distribution that is equivalent to the radiation source of unnecessary electromagnetic waves inside the electronic devices. Information of the equivalent current distribution could provide us some important knowledge to analyze the radiation source which could be the source of the EM interference. Previously, most of the researches have focused on estimating the location of CW electromagnetic radiation source in frequency domain. In this paper, a method including near field measurement in time domain and matrix inversion is proposed to estimate the equivalent current distribution of incoherent radiation source. The validity of this method is demonstrated using numerical simulations and experiments.