Far Field Estimations and Simulation Model Creation from Cable Bundle Scans

摘要

The emission level of automotive systems is often governed by the cable harness, it is often the dominant radiating structure and determines the position of resonances. The established field measurement methods according CISPR 25 for evaluation of emissions suffer from the need to use large anechoic chambers. Furthermore measurement data can not be used for simulation model creation in order to compute the overall fields radiated from a car. In this paper a simple method to determine the far-fields and a simulation model of a radiating cable bundle from near-field measurements is proposed. The method measures the electromagnetic fields at several points near to a cable bundle. Measurements are done in time domain in order to get phase information, to reduce measurement time, and to correlate different measurement data sets. From the field measurement data an equivalent current distribution in a cable bundle can be computed. With this information a simulation model of the setup can be generated, far-field estimations can be done.