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A technique based on a source reconstruction method (SRM) is employed to reproduce the same electromagnetic radiated emissions from printed circuit boards (PCB). This equivalent source is composed of both the electric and magnetic currents that are represented by a set of Rao-Wilton-Glisson basis functions. Planar magnetic near field is served as the input information for the SRM. The equivalent source is inversely acquired through the conjugate gradient algorithm that minimizes the norm of the residue. Magnetic field integral equation is utilized to find out the unknown coefficients of the currents. This method is directly extended to model the emissions from PCBs in shielding boxes, in which the PCBs are substituted by the reconstructed equivalent current source, the interaction between the PCBs and cavity is calculated via the method of moments. To investigate the robustness and versatility of the proposed approach, various numerical examples are presented.