【作者】 刘秀祥；

【导师】 雷振亚；

【作者基本信息】 西安电子科技大学 ， 电磁场与微波技术， 2011， 硕士

【摘要】 本文基于TEM喇叭天线的基本模型,设计了一种新型的飘带喇叭天线。该设计兼顾了天线的辐射效率和轻量化等方面的考虑,用两根弯曲的窄带代替了基本模型中的上板,使得飘带喇叭天线可以工作在更低的频率范围内。文中首先针对该喇叭天线的一些重要物理尺寸,利用ANSOFT HFSS仿真软件进行了分析,得到了飘带喇叭天线的各个参数与天线性能之间的关系。仿真结果表明该模型有效的改善了TEM喇叭天线的低频性能,展宽了天线的频带。而与其它TEM喇叭天线相比,此设计减少了巴伦结构。其次,在飘带喇叭天线的模型基础上,经过对初步模型进行调整,优化了窄带结构的设计形式,使得其渐变方式更加灵活,并且采用了上下一致的渐变过程。仿真结果表明:改进的飘带喇叭天线模型与初步模型相比,更加有效地提高了天线在低频频段的辐射性能,减少了能量的反射,同时工作频率范围也有了进一步的展宽。改进的飘带喇叭天线在0.1GHz～4GHz频率范围内,VSWR保持低于2.0,与初步模型相比,大幅降低了天线的驻波,增加了天线的实用性。最后,对飘带喇叭天线的初步模型进行了组阵,用以提高天线的增益以及改善天线的辐射方向图。更多还原

【Abstract】 In this paper, a novel horn antenna named ribbon horn antenna is proposed. Takingantenna radiation performance and light weight into account, the novel ribbon hornantenna uses two curved ribbons substituting the top plate of the basic model. Due tothe ribbon structure, the antenna can operate at lower frequency bands compared withthe other TEM horn antennas. Firstly, the important size of the ribbon horn antennacould be analyzed using ANSOFT HFSS simulation software. The results show that thelow frequency characteristics of the antenna have been modified, and the operatingfrequency range has been extended correspondingly. And it possesses much lessreflection without balun as other TEM horn antennas. Secondly, based on the basicribbon horn antenna, improved antenna model has been adjusted. Ribbon structure isoptimized, making the design more flexible and gradual structural symmetry. It can beobtained that the improved ribbon horn antenna model is more effective in improvingthe radiation performance and reducing energy reflection compared with the originalmodel. The operating frequency range has been further broadened, which is from 22MHz to 1000 MHz for VSWR less than 2.0. That increases the practical range of theantenna. Finally, the antenna array consisted of the original model enhance the gain andimprove the radiation pattern.更多还原