八木天线无论作为单元还是阵元,以其结构简单、造价低廉、应用灵活在实践中获得了广泛的应用。其中包括用作室内外移动通信系统网络覆盖工程中的施主天线和电梯井、隧道、长廊等场合的重发天线。2002年3月25日，“神舟三号”发射升空，八木天线经过线性极化形成三个极化面，其中一个极化面垂直于另外两个相互平行的极化面。其工作原理是：以两个平行面天线作为干涉仪，而与这两个面垂直的极化面用以判定所接收电波的极化程度，通过三角波形的测量可以计算出所截获电波的方位八木天线有着很广泛的应用，比如在军事方面、日常生活方面以及网络方面。但是它也存在着一些缺陷，比如频带窄、抗干扰性差等。本文主要分析了八木天线的结构及原理，并利用HFSS软件对八木天线的性能结构进行分析和设计，提出了进一步改进和优化性能指标的方法。-Yagi antenna either as a unit or array element, with its simple structure, low cost, flexible application in practice has obtained the widespread application. Including used as an indoor mobile communication system network covering engineering of the donor antenna and the elevator shaft, tunnel, corridor and other occasions of retransmission antenna. In March 25, 2002," Shenzhou three launch, after" Yagi antenna linear polarization to form a three polarization plane, wherein a polarization plane is perpendicular to the other two mutually parallel to the plane of polarization. Its working principle is: with two parallel plane antenna as an interferometer, and the two face perpendicular to the plane of polarization is used to determine the received signal degree of polarization, through a triangular waveform measurement can be calculated from the intercepted radio range of Yagi antenna has very wide applications, such as in the military context, everyday life and network. But it also has