Ku波段电磁涡旋相控阵列天线设计

发布时间：2018-09-18 11:26

【摘要】：为了能产生性能更好携有轨道角动量的涡旋电磁波,采用微带天线技术,设计了一种新型的相控微带阵列天线.以同轴馈电的圆微带天线为单元,将8个、16个相同的单元天线等间隔的分布在一个同心圆上分别组成两个单圆环和一个双圆环结构的相控阵列天线,并采用等幅且同一环的相邻单元间相位差为常数的方式进行激励.通过电磁场全波仿真软件Ansoft HFSS建模并优化,单圆环和双圆环阵列结构均在中心频率为15 GHz处获得了携有轨道角动量的涡旋辐射方向图.结果表明:虽然单圆环结构的相控阵列天线可通过增加阵元数来改善电磁涡旋性能,但不可避免的造成更大的天线体积;而利用双圆环结构,由于增加一个内环设计自由度,结合内外环的协同优化仿真,通过设置适当的天线阵列结构和相位延迟,双圆环结构较单圆环结构产生的涡旋电磁波有更小的中心轴线开口张角,具有更强的涡旋方向性和更高的辐射增益.
[Abstract]:A novel phased microstrip array antenna is designed by using microstrip antenna technology in order to generate eddy electromagnetic waves with better performance and orbital angular momentum. The phased array antenna with a ring structure is excited by the same amplitude and the phase difference between adjacent elements of the same ring is constant. The vortex radiation patterns with orbital angular momentum are obtained at the center frequency of 15 GHz by modeling and optimizing the electromagnetic field full-wave simulation software Ansoft HFSS. The results show that although the single-loop phased array antenna can improve the electromagnetic vortex performance by increasing the number of elements, it will inevitably result in larger antenna size; while the double-loop structure, due to the increase of an inner-loop design degree of freedom, combined with the co-optimization simulation of inner and outer rings, can be used to set the appropriate antenna array structure and phase. With potential delay, the eddy electromagnetic wave generated by the double-ring structure has smaller opening angle of the central axis, stronger eddy directivity and higher radiation gain than that generated by the single-ring structure.
【作者单位】：浙江工业大学信息学院;中国科学院国家空间科学中心;
【基金】：中国科学院空间科学战略性科技先导专项基金(XDA04060300) 中国博士后科学基金(2013M540147)
【分类号】：TN821.8

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