论文名称为“Two-dimensional near-field focusing folded reversely fed leaky-wave antenna array with high radiation efficiency”。 论文设计了一款工作在 Ka 频段的高辐射效率二维聚焦漏波天线阵。该天线基于基片集成波导设计，通过简单紧凑的反向馈电网络实现了二维高效率聚焦，实现天然平衡分布。同时，其相邻反向单根漏波天线在宽度上具有互补的特点，通过宽度阶跃的基片集成波导方式实现了准均匀的单元分布来避免杂散辐射的产生。值得一提的是，近场漏波天线不同于远场漏波天线，远场漏波天线可以通过增加单元个数实现辐射效率的提升，但是近场天线增加单元个数会随着口径的变大，所需的平方律相位将会急剧变化，漏波天线调制会面临剧烈的单元稀疏分布。论文中将所有反向馈电的漏波线阵首尾相连来简化整个馈电网络和打破辐射效率的限制，该收尾相连的结构被称为能量回收网络，在远场漏波天线波束赋形中被广泛用来提高辐射效率和简化馈电网络。该天线的设计方法和过程在文章中进行了详细介绍。工作主要完成人为吴亚飞，程钰间。

论文链接：https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8668805

Abstract— This paper presents a 2-D near-field focusing (NFF) substrate-integrated-waveguide (SIW) leaky-wave antenna (LWA) array with high radiation efficiency. In most of the existing 2-D NFF antenna arrays, the required quadratic phase and balanced amplitude distribution are achieved by the use of the transverse topology with a complex feeding network or the simple radial topology with high polarization loss. Here, a folded reversely fed LWA with transverse polarization is proposed to achieve natural balanced radiation with a sample series-fed network. Meanwhile, the width of the single linear LWA is complementary with the reversely fed topology. In this case, the SIW with a stepped width is applied to achieve a quasi-uniform slot distribution and to avoid the spurious radiation. Then, all reversely fed linear LWAs are connected by the meander-line structure, which can simplify the feeding network and enhance the radiation efficiency. The limitation of the NFF LWA in radiation efficiency is broken. The 2-D focusing principle and the design process of the proposed antenna are presented in this paper. As an example, a 2-D focusing SIW LWA array operated at 35 GHz with an 80% radiation efficiency is fabricated and measured.

Index Terms— High radiation efficiency, leaky-wave antenna (LWA), meander-line structure, 2-D near-field focusing.