超宽带圆片天线的分析与设计  

Analysis and Design of Ultrawide-band Circular Antenna

作　　者：钟玲玲[1] 邱景辉[1] 孙博[1] 

机构地区：[1]哈尔滨工业大学电子与信息技术研究院,哈尔滨150001

出　　处：《宇航学报》2008年第4期1387-1392,1413,共7页Journal of Astronautics

摘　　要：宽频带是当前天线领域的研究热点之一。圆片单极天线是一种馈电简单的超宽带天线,给出了这种天线的设计方法,通过仿真与实验验证了该天线良好的超宽带特性。以此为基础,进一步研究了几种圆片单极天线的变形形式,包括平板圆片单极天线、旋转角度圆片单极天线、折叠圆片单极天线以及四个圆片单极子形成的组合天线。对于各种新型圆片天线进行了理论分析,分别计算了天线的反射损耗和辐射方向图随频率的变化规律。通过分析表明这些天线不仅能够在很宽的频带上满足反射损耗的要求,而且对于传统的圆片单极天线进行了有效的改进,实现了平板化、小型化、宽波束、圆极化等不同的特性。它们在卫星通信和移动通信中具有良好的应用前景。Wide band is one of the hottest issues in the current researches on antennas. The circular monopole antenna is a kind of ultrawide-band antennas with simple feeding network. The design method of the antenna was presented in this paper. Through simulations and experiments, it was demonstrated that the antenna had good ultrawide-band performance. On this basis, further study was applied to several novel types of circular monopole antennas, including planar circular disc monopole, circular disc monopole with a certain angle, circular disc monopole puckering a certain length and the assembled disc monopoles which were composed of four circular discs. The novel antennas were theoretic analyzed, and the return loss and radiation patterns of the antennas were discussed. The analytic results verified that the novel antennas could not only satisfy the requirements of return loss in a wide frequency band but also effectively improve the characteristics of the traditional monopole antenna. Planarity, miniatur- ization, wide beam and circular polarization characteristics of the monopole antenna were realized. The novel antennas are suitable for the satellite and mobile communication systems with good prospects.

关 键 词：超宽带天线 圆片单极天线 平板天线 小型化 宽波束 圆极化 

分 类 号：TN82[电子电信—信息与通信工程]