The EMC Design Of Generalized Bus In Vehicular Communication System

With narrow room and multitudinal electronic equipments, problem of Electromagnetic Compatibility (EMC) in vehicular communication system is serious. In recent years, with the use of the technique of bus, bus become an important system interconnection equipment in big communication system including vehicular communication system, but electromagnetic compatibility issue because of the use of bus has become increasingly evident. With the use of bus, the distance between the single line become shorter and the mutual coupling effects of lines is become stronger. It will be of great significance and value in engineering to study the issue of Electromagnetic Compatibility of the bus.Reference to Paul's method, this paper use the transmission line theory and two-port theory to establish the vehicular bus model and use the transmission line equation which is got form the model to analyze mutual coupling of the bus. Then the simulation software is use to study the impact to coupling of the layout of the bus and the characteristics of the transmission signal on bus, and the conclusion has the significance in practice.Shielding effectiveness of bus is an important indicator in the electromagnetic compatibility design. How to measure its shielding effectiveness is a question worth considering. This paper compares a variety of testing methods and the Line Injection is chosen as the testing method. In order to make it suitable for testing multi-core cable such as bus, we improve the method.This paper uses computer language of VB and C to improve the original software which is used to analysis the electromagnetic compatibility of interconnection cable, enhance its accuracy of the calculation. The simulation has better instructive significance in engineering practice.