基于UMTS基站天线的功分器馈电电路设计分析.docxVIP

电子科技大学学士学位论文 PAGE \* MERGEFORMATII 电子科技大学 学士学位论文 论文题目：基于UMTS基站天线的功分器馈电电路设计 学生姓名： 蒋高桥 学 号： 2702003011 学 院： 电子工程学院 指导教师： 班永灵 副教授 指导单位： 电子工程学院电磁学研究所 摘 要 随着移动通信技术的迅猛发展，我国第三代移动通信系统已全面商用。作为移动通信系统中的关键部件，基站天线性能的优劣，对整个通信系统的总体性能有着决定性的作用。微带贴片天线由于其体积小、重量轻、易于加工等特性，在微蜂窝基站天线领域已得到广泛应用。而微带贴片天线在实际应用中往往是由多个贴片单元组成天线阵列来使用。由微带功分器组成的馈电网络由于其重量轻、易于和天线集成，便于馈电网络的布局，越来越受到青睐。然而由于微带线具有一定的辐射损耗，对于微带线组成的馈电网络，其不同的馈电方式可能对天线的方向图产生不同的影响。因此研究馈电网络的布局，从而减少对天线的干扰，对提升天线的性能有重要意义。 本文首先对功分器的基本理论及性能指标进行介绍。然后阐述了二路及多路功分器的设计方法及仿真结果。最后结合课题的需要，基于UMTS基站天线平台，设计馈电网络，采用仿真软件Ansoft HFSS对天线阵进行仿真优化，分析不同馈电网络对天线性能的影响，以达到设计要求，具有一定的实用价值。 关键词：功分器，基站天线，馈电网络，UMTS，方向图ABSTRACT ABSTRACT With the rapid development of mobile communication technology, Chinas third generation mobile communication system has been fully commercial. Mobile communication system as key components, the base station antenna performance of the merits of the overall performance of the whole communication system has a decisive role. Microstrip patch antennas because of its small size, light weight, easy processing characteristics, in the field of micro-cellular base station antennas have been widely used. The microstrip patch antenna in practical applications are often composed by a number of patch antenna array elements to use. Microstrip power divider by the composition of the feed network due to its light weight, easy and antenna integration for easy feed network layout, more and more popular. However, due to the radiation of microstrip lines with a certain loss, the composition of the microstrip line feed network, the different way of feeding the antenna pattern may have different effects. Therefore, the layout of the feed network, thus reducing the interference of the antenna, to enhance the performance of the antenna is important. This paper first the basic theory of power splitters, performance in