【作者】 吴亮；

【导师】 杨燚；

【作者基本信息】 南京大学 ， 电子与通信工程， 2012， 硕士

【摘要】 随着现代军事隐身技术的发展,以及生活中各种有害电磁辐射的不断出现,人们对微波吸收材料关注度越来越高,而对微波吸收材料性能进行准确测试又是研究微波吸收材料的关键。各种吸波材料的测试研发都离不开宽频带天线的参与,因此作为接收和发射设备,宽带天线成为了电磁干扰、电磁兼容测量和无源测向、侦察与干扰必需的重要设备,而超宽带天线的设计成为了必不可少的一个环节。在各种不同技术要求下,加脊喇叭天线因其极宽的工作频带,相对平缓的高增益,较小的体积和使用安装方便等优点,被广泛使用于各个领域。本文基于实验室对微波吸收材料的测试需求,首先对加脊喇叭天线的设计理论和方法进行了详细地讨论,并根据实验室的实际情况,利用高频电磁仿真软件Ansoft HFSS仿真设计了一副1-8GHz的宽带加脊喇叭天线,并加工出成品,最终宽带喇叭的驻波比、增益和方向图经过测试均满足设计的要求。最后利用该宽带加脊喇叭天线依靠拱形法测量系统测试了平板微波吸收材料的反射率,并将测试结果和标准喇叭天线结果进行对比分析,结果显示,该宽带喇叭能够满足测试应用需求,完成了既定研究目标。更多还原

【Abstract】 In recent years, with the development of military stealth technology, and the affection of electromagnetic radiation on the human body in the life, more and more attentions have been paid to the microwave absorption materials. Therefore, the accurate measurement on properties of microwave absorption material becomes very crucial.The research and measurement of microwave absorbing materials can’t be carried out without participations of the wide band antenna. As receiving and transmitting devices, the wide band antenna has been becoming the necessary equipment in researching electromagnetic interference, electromagnetic compatibility measurement, passive measurement, surveillance and interference, so that the design of wide band antenna also becomes a necessary part. In order to meet different technical requirements and conditions, the ridged-horn antenna is widely used in a variety of fields, for its extremely wide frequency band and relatively flat high-gain, meanwhile, it owns the small size and could be installed easily.In order to meet the measurement needs of microwave absorbing materials in our laboratory, first of all, the design theory and method of wideband ridged horn are discussed in detail in the paper. In accordance with the actual situation of our laboratory, with the help of high frequency electromagnetic simulation software Ansoft HFSS, a double-ridged horn with a wide band frequency from1GHz to8GHz has been designed and made into the product. By testing the performance parameters of the VSWR and gain direction graph, we found that it has good electromagnetic properties. Finally we use the double ridged horn and standard horn antenna to measure the reflectivity of microwave absorbing materials separately in a arch measurement system, and analysis the two measurement results. The results show a significant consistency with the measurement data. So the wide band double ridged horn could meet the measurement application requirements, and completes established goals.更多还原