论文名称为“Shared-aperture phased array antenna with co-designed near-field coupled circular polarizer loaded for K/Ka-band wide-angle satellite communication”。针对现有工作对异频线极化共口径相控阵和加载的线-圆极化栅直接进行联合仿真优化而非协同设计，阵列天线与极化栅之间相互耦合，二者工作性能相互制约，存在工作带宽窄、整体阵列规模大导致优化效率低的问题，该文提出了一种天线与近场加载极化栅协同设计方法。首先分别设计了K/Ka共口径线极化相控阵天线和双频线-圆极化栅超表面。然后分析了在天线近场区，天线与极化栅两者相互耦合机理，并进行协同设计。通过分析天线交叉极化、天线与极化栅间距以及极化栅反射系数等参数，提出了实际圆极化轴比计算方法。并且，为了提高圆极化扫描能力，针对不同入射角度下电磁波对极化栅表面的影响不同，对极化栅表面进行了分区设计，重组了不同极化栅单元不同区域排列位置，最终实现双频大角度圆极化扫描。为验证设计，本文对K/Ka波段近场加载线-圆极化栅和相控阵天线样品完成了加工和测量。在低频段19.7-20.2 GHz 和高频段29.5-30 GHz ，圆极化扫描范围分别达到正负55°和正负60°，最大轴比小于4 dB。工作主要完成人常鑫、王洪斌、李廷军、金世超、刘敦歌、程钰间。

论文链接：https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9855430

Abstract— A K-/Ka-band shared-aperture linear polarization 2 (LP) phased array antenna and a circular polarizer are combined 3 to realize circular polarization (CP) beam scanning. When the 4 polarizer is close to the antenna array, its performance will 5 become difficult to predict due to the influence of the antenna 6 source. This will bring uncertainty to the cooperative work. 7 We propose a codesign method of polarizer unit considering 8 the factor of antenna array. This method can better design 9 the polarizer working in the near field of antenna array. Next, 10 to improve the CP scanning range, the polarizer is not composed 11 of repeated units, but adopts a codesign partition scheme. 12 We combine the polarizer unit specially designed for large-angle 13 incidence and for normal incidence to a polarizer plane. The 14 partition scheme is optimized with an algorithm according to 15 the field distribution of antenna. This combination produces 16 right-hand circular polarization (RHCP) at 19.7–20.2 GHz and 17 left-hand circular polarization (LHCP) at 29.5–30 GHz, and the 18 axial ratio (AR) of CP is less than 4 dB in the scanning range of ±55◦/±60◦ 19 at two operating bands. The proposed combination 20 concept and the design results have been validated by the 21 experimental results. 

Index Terms— Dual-band dual-circular polarization (CP) 23 shared-aperture antenna, linear-to-CP converter, satellite com24 munication, wide axial ratio (AR) scanning.