Research on the EMI radiation of discharge of Pantograph-offline on EMU

Wireless communication plays an important role in high speed railway (HSR) system. As air interface is open, EMI radiation is of significance to HSR wireless communication. This work analyzes current EMI radiation within HSR system firstly, and concludes that main EMI radiation is caused by discharge of Pantograph-offline on EMU. Then on the basis of theoretical models of such discharge, which reflects the physical characteristics of offline signal directly, transient far field radiation model is established and analyzed. Consequently the far field radiation is simulated to verify theoretical model. Results show that, for common wireless communications, such as GSM, LTE and so on, the EMI radiation should be considered in radiation EMS tests for HSR wireless equipments.