Near-field imaging of radiated emission sources on printed-circuit boards

摘要

This paper presents a technique to assess the level of radiated emissions generated by printed-circuit board (PCB) structures based on equivalent magnetic currents. These currents are extracted from near-field measurements taken with a very high resolution (step size ?) in comparison with near-field antenna applications. Near-field data allow the visualization and extraction of common-mode currents near transmission line discontinuities such as bends. This effect is investigated for microstrip and CPW lines.