Investigating Cosite Interference Effects on an Automobile

The modern car includes an ever-increasing number of wireless systems. These require an assortment of different antennas, often mounted in close proximity. Coupling between these antennas can lead to cosite interference effects, degrading the performance of the systems or disrupting them altogether. This article demonstrates how a full-wave simulation in CST MICROWAVE STUDIO® (CST MWS) can be combined with RF cosite interference analysis in Delcross EMIT to identify and mitigate EMC/EMI problems. The causes of interference problems can be complex, and even when radio systems are operating on completely different frequency bands, there is still a risk of interference. Sources of EMI include broadband noise, ambient noise and harmonic & spurious emissions. Each of these has the potential to cause in-band and out-of-band interference in the victim receivers.