全空域多面阵天线性能分析与遮挡判决

为适应全空域多目标测控对天线的需求,提出一种基于多面阵拼接的全空域覆盖天线。与球面阵天线相比,多面阵天线在工程实现和波束控制方面具有明显优势。分析了不同阵面数对天线波束性能的影响。考虑到实际应用中遮挡效应对天线方向图的影响,介绍了一种有效的遮挡判决算法。该算法首先将处于亮区的阵面投影到来波投影面中,而后采用线段相交原理确定投影面是否相交,最后根据相交投影面景深大小判断它们的遮挡关系。理论分析与仿真结果表明,多面阵天线全空域增益相对稳定,遮挡判决算法可行有效。

一种宽覆盖域多波束形成方法分析

在研究平面阵多波束宽覆盖域问题时,设计了一种由7个平面阵组成的多面阵天线,给出了一种多面阵天线宽覆盖域多波束形成方法及具体设计步骤。理论分析与仿真结果表明,该多面阵采用上述宽覆盖域多波束形成方法形成的多波束不仅可以完全覆盖整个空域,而且在卫星系统和高空平台系统中具有广泛的应用前景。

Mutual coupling reduction of multiple antenna systems

A multi-band multi-antenna system has become an important trend in the development of mobile communication systems.However,strong mutual coupling tends to occur between antenna elements with a small space,distorting array antennas’performance.Therefore,in the multiple-input multiple-output(MIMO)antenna system,high isolation based on miniaturization of the antenna array has been pursued.We study in depth the methods of decoupling between antenna elements.Reasons for the existence of mutual coupling and advantages of mutual coupling reduction are analyzed.Then the decoupling methods proposed in recent works are compared and analyzed.Finally,we propose a metasurface consisting of double-layer short wires,which can be applied to improve the port isolation of antennas arranged along the H-plane and E-plane.Results show that the proposed metasurface has good decoupling effect on a closely placed antenna array.