Source Reconstruction Method Using Phase-Less Magnetic Near-Field Measurements: Application of the Method of Moment with Roof-Top Basis Functions

Abstract

Source reconstruction methods have many applications such as antenna diagnosis, calculating far-field radiated emissions, and identifying incompatible sources on integrated circuits or printed circuit boards. In this paper, the Gerchberg-Saxton algorithm is used to retrieve the phase of the transverse magnetic near-field data measured on two parallel plates above the equipment under test (EUT). Then, the method of moments using roof-top basis functions is applied to reconstruct the horizontal electric current densities for the EUT. The proposed method is validated by comparing its results to full-wave simulations obtained using the CST-MWS software.

Inverse MoM Approach to Near-Field Prediction and RFI Estimation in Electronic Devices With Multiple Radiating Elements

“…d. Note that the formulas are identical to those used in the dipole moment-based method in [33] since the continuous current source in the MoM is the superposition of dipole currents in the mesh edges. In the dipole moment method, the source mesh is uniform while in the proposed approach the surface current is predicted in a zig-zag mesh, although a uniform mesh can be realized by using other types of basis functions (e. g. see source reconstruction with rooftop basis functions in [34]). The electromagnetic fields in the reverse problems are related to the measured scattering parameter via the probe factor of the electric and magnetic field probes [33].…”