论文名称“K-/Ka-Band Shared-Aperture Phased Array With Wide Bandwidth and Wide Beam Coverage for LEO Satellite Communication”， 针对现有共口径相控阵面临无法同时满足Ka频段卫星通信需求，在带宽、极化形式、波束扫描范围、隔离度四项电磁指标上无法同时实现俱优的问题，提出了一种用于低轨卫星通信的宽带宽、宽波束覆盖的K/Ka频段共孔径端射相控阵天线。该天线具有双频大带宽、正交圆极化、宽波束覆盖单位以及K波段和Ka波段信道之间的高隔离度。高低频单元的新型布阵拓扑促成了宽带圆极化波束的实现以及更大的扫描范围，滤波结构的加载和集成波导的截止特性则提升了分别在低频段和高频段提升了天线的收发隔离度。该天线可法向实现双频各3.5GHz带宽，实现±60度圆极化波束扫描范围同时还可维持1.5GHz带宽收发天线间的隔离度在工作频段内均大于40dB。与以往的共口径天线相比，该天线同时实现了宽带、正交圆极化和宽波束覆盖，是一种适用于卫星通信相控阵的良好方案，适用于低轨卫星通信、动中通等应用场合。工作主要完成人：郝瑞森，程钰间。

论文链接：https://ieeexplore.ieee.org/document/9955558

Abstract— A K-/Ka-band shared-aperture endfire phased array antenna is presented in this article. The antenna has the properties of dual wide bandwidths, orthogonal circular polarizations (CPs), wide beam coverage, and high isolation between the K-band and Ka-band channels. In this work, a new array topology is proposed to enhance the design freedom and the periodicity of the antenna array. Then, the filtering structures used to reflect the crossband coupled power also enhance the isolation between the K-band and Ka-band channels. The crossband mutual coupling is reflected and reradiated to generate the wideband CP beams. The high-order parallel plate waveguide (PPW) mode is suppressed to realize the wide CP beam coverage. The working bands at the boresight are 17.7–21.2 and 27.5–31.0 GHz, respectively. The polarizations are right-hand CP (RHCP) in K-band and left-hand CP (LHCP) in Ka-band. The maximal scan angles are ±60°. The axial ratios (ARs) are below 3 dB at boresight and below 5 dB when the beam scans to ±60°. The isolation between the K-band and Ka-band channels is higher than 40 dB.

Index Terms— Circular polarization (CP), endfire antenna, low Earth orbit satellite communication (LEO SatCom), shared-aperture phased array antenna.