一种小规模超宽带相控阵天线设计

Design of a Small Scale UWB Phased Array

目前基于阵元间强耦合效应已设计出超宽带相控阵天线,但是其规模较大。针对规模小或者在扫描方向上规模小,如何增强阵元间耦合而实现超宽带相控阵天线的问题,采用平衡对踵Vivaldi天线(BAVA)作为天线单元,优化天线单元辐射金属的形状,并采用镜像法布阵天线单元设计出一个小规模4×16的斜极化超宽带相控阵天线。仿真和试验结果表明,采用的方法可以增强小规模超宽带相控阵天线的阵元间耦合效应,实现频率0.8f_0~2.0f_0(f_0为工作频率)驻波比小于2,法向增益达17.34~23.0 d Bi,在±45°范围内实现无栅瓣扫描。该小规模超宽带相控阵天线已在实际工程中应用。

At present,a lot of ultra - wideband （ UWB） phased arrays have been designed based on the strong mutual coupling between the array elements. But the UWB phased arrays are large. For a small scale or a small scale array in the scanning d irection,the problem of how to achieve the ultra-wideband perform-ances by enhancing the mutual coupling between the array elements is necessary to be developed. In this paper,Balanced Antipodal Vivaldi Antennas （ BAVAs） are adopted. By optimizing the radiation metal shape and arranging the direction of the antenna elements with mirroring technique,a small 4 x 16 oblique polarization UWB phased array is designed. The simulation and experiment results show that this method can enhance the mutual coupling between the small UWB array elements. The array has a good voltage standing-wave ratio （ VSWR） less than 2. 0 in the frequency 0. 8f0 -2. 0 f0（f0is the operation frequency）, norm gain 17. 34 -23. 0 dBi,and large scanning angle beyond 45.without grating lobes. The designed small scale UWB phased array antenna has been applied in engineering.