| With the raising of train speed quickly and development of high speed railway, it is becomeing more and more important to improve the reliability and safety of railway. It is proposed to design the train to train communication system based on ultra-short wave. The system can realize the exchange of real-time information such as the speed, location between tracing trains in the same line only through vehicular communication equipments, therefore, can it be the standby system or emergency communication system to improve the safety of train operation.The importance of antenna for communication system and the particularity of railway communication decide to design a suitable antenna becoming particularly important. This thesis is to design a suitable antenna for the system and research on electromagnetic interference of the antenna mainly.It is studied from some aspect of the selection, design, emulate and electromagnetic of the antenna.Through the research of the current typical antenna, railway mobile antenna used now, the frequency band selected of the system, the antenna interference and railway communication features, the full-fold dipole of closely spaced Yagi antenna is selected and designed. This thesis studies the characteristics of the radiation impedance and the radiation efficiency of the folded dipole and designs the folding vibrator. Also, the Full-fold Dipole Close Spaced Yagi Antenna can be designed through researching the traditional idea and method of Yagi antenna. The High Frequency Structure Simulator(HFSS) software is used to simulate its parameters. Finally, we use the Genetic Algorithm to optimize the antenna and get the optimal solution.It is found that who interferent the antenna are Natural electromagnetic, train body, Contact net and so on.A detailed simulation is done to analysis the influence from the train body and the contact network for the antenna, which rovides a theoretical basis to Electromagnetic Compatibility Measurement for the system. |
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