论文名称为“Planar ultra-wideband and wide-scanning dual-polarized phased array with integrated coupled-marchand balun for high polarization isolation and low cross-polarization”。超宽带相控阵天线凭着其方向图赋形灵活、抗干扰能力强、跟踪精度高等优势，被广泛地应用于电磁战领域中。然而，现有双极化超宽带宽角扫描天线实现方案存在极化隔离度差的问题，不利于平台对天线极化矢量的高效利用。本课题组采用平面强互耦双极化偶极子天线组阵，其正交多极化辐射器具备非频变高隔离特性，有望支撑收发通道宽带同时工作。采用宽带平衡馈电结构的双极化平面集成相控阵天线，在具备4.5倍频程覆盖、±60°宽角扫描前提下，可提升同类工作极化隔离度20dB以上。本课题组现有成果在实现了C、X、Ku波段（4~18GHz）同时覆盖的前提下，具备40dB极化隔离度、±60°波束覆盖，且其剖面高度仅为0.12λlow。该成果可保障系统极化双工能力，促进应用平台多功能、多系统融合，提升系统空间利用率。工作主要完成人孙建旭、程钰间、樊勇。

论文链接：https://ieeexplore.ieee.org/document/9362151

Abstract—In this article, a dual-polarized planar phased array with high polarization isolation and low cross-polarization is presented operating from 4 to 18 GHz, i.e., 4.5:1. The proposed array is comprised of tightly coupled dipoles with integrated coupled-Marchand baluns. To improve the uniformity of fields distributed on the array, the center-feeding dipole is used in this design instead of the conventional edge-feeding one at first. Then, the outer conductors of the feed are composed of a group of shorted vias with the proper number and position. Based on these methods, the output balance of the balun is significantly improved, resulting in high isolation between ports with different polarization modes. Furthermore, this feed has a natural ability to suppress the D-plane common mode resonance. The capacitive metallic annular plate over adjacent radiating elements and the thick aluminum plate with an air cavity placed under the array are employed together to suppress the in-band coupled-loop modes. The infinite array simulation indicates that the array can achieve transmit (Tx)/receive (Rx) isolation more than 48 dB at broadside. Isolation better than 32 and 30 dB can be achieved when scanning to 45° in E-/H-planes and 60° in E-plane, respectively. The cross-polarization level is below −54 dB at broadside and remains below −29 dB when scanning to 60° in E-plane as well as 45° in H-plane. A 12×12 dual-polarized antenna array is fabricated and measured to validate the correctness of this design. This type of antenna can be applied in wideband simultaneous transmit and receive (STAR) monostatic systems.

Index Terms—Dual-polarized, high polarization isolation, low cross-polarization, planar phased array antenna, ultra-wideband (UWB), wide-scanning.