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—In this paper, a miniaturized planar rat-race coupler is proposed to achieve arbitrary power division ratio and harmonic suppression performance simultaneously. It consists of six enhanced T-shaped line sections. The T-shaped lines can be equivalent to arbitrary electrical length lines rather than the conventional λ/4 lines. The explicit design formulas(More)
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(More)
Pantograph arcing is the main electromagnetic interference source in electric railways. A series of measurements of the radiated power of pantograph arcing has been taken in a reverberation chamber by using a laboratory replica designed to simulate the arcing pantograph. The radiated power properties are investigated in different resolution bandwidths, arc(More)
The GSM-R become the communication system for data and voice transmission throughout the China Rail Network. However, the GSM-R communications can be significantly disturbed by the electromagnetic (EM) interferences produced by the High-Powered catenary system. Our measurements highlighted that the EM interferences produced when sparks occur due to the poor(More)
In this paper, we present a new method of on-site radiated emission measurement of train. This method is based on Blind Source Separation(BSS) which the prior knowledge of the source signals and transmission channels are unknown. By processing the received multi-channel mixed data, the source signals can be extracted only via two hypothetical conditions(More)
The environment inside of train is heavily polluted by electromagnetic noise from the railway system itself. These electromagnetic noise may do harmful to passengers and interrupted the communication devices. Aiming at analysis of electromagnetic environment inside railway, the shielding efficiency of enclosure will be researched at first. The(More)
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