Simulation of Conductive and Radiated Emission for Off and On-Board Radio Receivers According to CISPR 12 and 25.

Two of the most commonly exercised standards by Electromagnetic compatibility (EMC) automotive engineers are CISPR 12 and CISPR 25. Both are developed and established by EMC regulatory committee named as CISPR (International Special Committee on Radio Interference) which is a part of International Electrotechnical Commission (IEC). While CISPR 12 is imposed as a regulation to ensure uninterrupted communication for off-board radio receivers, CISPR 25 is often applied to ensure the quality of services of on-board receivers. Performing these tests becomes challenging until the vehicle is prototyped which may prolong the production time in case of failure or need for modification. However, conducting these tests in simulation environment can offer more time and cost-efficient way of analyzing the electromagnetic environment of automotive vehicles. In this paper, a computational approach is proposed in order to predict electromagnetic disturbance from on-board electronics/electrical systems using 3D computational electromagnetic (CEM) tool; Altair Feko. The presented study elaborates on radiated and conductive emission simulations performed for both vehicular and component/module level EMI testing according to CISPR 12 and 25. Simulation setup was designed according to the corresponding standard. A high-frequency dynamic circuit network of a DC wiper motor is considered as a source of emission (the DC wiper motor measured input impedance can be used as well). Moreover, different receiving antennas including Biconical antenna for 30MHz – 200MHz band and Log-periodic Dipole Array antenna for 200MHz – 1GHz frequency were used according to the standards. Different antenna parameters including gain and antenna factor were considered to ensure having the correct setup. A study is also conducted by analyzing effects of different types of cable harness on radiated and conducted emission.