Desing Of Low Sidelobe Microstrip Array Antenna In Ku Band

With the development and popularity of the various means of transport, traffic accidents have increased. In the traffic accident happened in the domestic and abroad every year, a higher percentage of traffic accident loss caused by the train, and with the constant speed of trains, increase the risk of traffic accidents. Caused by the train accident is often accompanied by a large number of casualties and economic losses, train accident has been a serious threat to people’s lives and property. Therefore, needed to train collision avoidance radar system and its antenna design has received wide attention of researchers both in the domestic and abroad.The author of this dissertation research put forward a kind of wide band, low sidelobe and high gain microstrip patch antenna array aiming at the train collision avoidance radar system, with the 8×8 microstrip feed unit and the same number of parasitic patch. The design of the feed network both adopt Chebyshev distribution in E plane and H plane of the array, through the research methods of simulation and experiment, finally achieved a 8×8 microstrip antenna array working in Ku band, with center frequency of 17.84 GHz, relative bandwidth of 14.35%, center frequency gain of 19.4 d Bi, and the first sidelobe level of-18 dB.First of all, the project of the antenna we adopted is reviewed in the dissertation on the basis of reviewing the literature in the domestic and abroad. Second we introduced the basic theory and design method of microstrip antenna and array, providing theory support for the subsequent antenna design. Detailed simulation analysis of the antenna design is given in the dissertation again, and simulation model and the simulation results after the optimization design of the antenna are gained. Finally, the antenna model using surface current analysis method are studied, through analyzing and calculating the simulation data of surface current, the mechanism of the implement of the broadband and low sidelobe are explained, and the test data are verified through experiments. Simulation, calculation and experiment results fit well, proving the correctness of the design. The designed antenna can be used to train collision avoidance radar system.