一种性能改进了的大张角四脊型超宽带馈源的研制

发布时间：2018-06-26 00:10

本文选题：反射面天线 + 超宽带馈源　；参考：《电子与信息学报》2014年10期

【摘要】：超宽带馈源在通信和射电天文等领域有着极高的应用价值。四脊喇叭作为宽带馈源的一种重要形式,存在着反射损耗性能较差,方向图随频率波动严重,照明张角难以拓展等诸多缺陷。本文基于国际上已有的研究基础,设计了一款工作于1.2~6.8 GHz的双极化大张角四脊型超宽带馈源。该设计方案对脊片部件采用了"削出倒角"、"厚度赋形"和"脊片外延"的改进措施,显著改善了馈源在低频段的反射损耗性能,同时也拓展了照明张角,使其能够更好地应用在大张角主焦照明的场合。实测结果显示出,该超宽带馈源的带宽和反射损耗性能均略优于国外样机。在边缘照明角为68°的大张角情况下,该馈源依然可以在1.2~6.8 GHz的带宽(相对带宽5.67:1)内达到低于-10 dB的反射损耗,其中在2.5~5.3 GHz内的反射损耗低于-15 dB。而且,该馈源在E面和D面的-12 dB边缘照明角随频率的波动小于20°。
[Abstract]:UWB feed has high application value in communication, radio astronomy and other fields. As an important form of broadband feed, the four-ridged horn has many defects, such as poor performance of reflection loss, serious fluctuation of pattern with frequency, difficulty in developing illumination angle, and so on. Based on the existing research in the world, this paper designs an ultra-wideband (UWB) feed with double polarization, large angle and four ridges working at 1.26.8GHz. In this design, the improvement measures of "cut out chamfer", "thickness profile" and "ridge extension" are adopted to improve the reflection loss performance of feed in low frequency band, and at the same time to expand the illumination angle. So that it can be better used in large-angle main focus lighting situation. The measured results show that the bandwidth and reflection loss performance of the UWB feed is slightly better than that of the foreign prototype. When the edge illumination angle is 68 掳, the feedback loss of the feed is less than -10 dB at 1.2n 6.8 GHz (relative bandwidth 5.67: 1), and the reflection loss is lower than -15 dB at 2.5 ~ 5.3 GHz. Moreover, the frequency fluctuation of -12 dB edge illumination angle of the feed is less than 20 掳on the E and D planes.
【作者单位】：中国科学院国家天文台;中国电子科技集团公司第三十九研究所;中国科学院大学;
【基金】：国家自然科学基金(10833003)资助课题
【分类号】：TN820

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