Network model for the analysis of radiated emissions from horizontal PCB submodules

The radiation behaviour of motherboard-subboard structures on printed-circuit boards is investigated. The analysis is based on an equivalent circuit including the connector inductance network and the radiating antenna structure. A special focus is put on the calculation of the mutual and self inductances of the connector pins. For this purpose simple closed-form expressions are developed for the central board region and validated by accurate cavity-model reference results. The final validation of the predicted radiated-emission characteristics by numerical 3D field simulations and by measurement shows a good agreement with respect to engineering purposes.