论文名称“A Dual-Band and Dual Circularly Polarized Wide-Angle Scanning Array Antenna With Single-Feed Elements at K-/Ka-Bands”，随着K/Ka频段卫星通信的发展，K/Ka频段共口径相控阵天线得到了大量研究，但大部分K/Ka频段共口径天线方案采用分频段多端口馈电，端口密度高，垂直过渡结构拥挤。为进一步降低K/Ka频段共口径相控阵的馈电压力，本文提出了一种具有单端口馈电单元特征的K/Ka频段双圆极化宽角扫描阵列天线。一方面，设计了一种具有双频反相特性的K/Ka频段定向耦合器，通过高次谐波模式工作特性降低特性阻抗变化，完成定向耦合器的单层集成。另一方面，使用短路柱来抑制寄生辐射电场，消除正交线极化波之间的额外相位差，从而提升宽角扫描时圆极化波束的性能。最后，考虑扫描范围内双线极化天线的扫描阻抗变化，采用联合设计方法对K/Ka波段耦合器进行修正，从而实现在60°空域内良好的圆极化辐射性能。实验与仿真吻合良好。工作主要完成人：杨锟，程钰间。

论文链接：https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10341286

Abstract—This paper presents a K/Ka-band dual circular-polarization (CP) wide-angle scanning array antenna with single-feed elements. The antenna has the properties of dual operating bands, orthogonal CPs, and wide beam coverage. The K-/Ka-band coupler is designed and employed in this antenna with ±90° phase difference excited at the same feeding port at different bands. Shorted posts are used to suppress the parasitic mode and improve the scanning performance of the antenna. Besides, the dual-band coupler is codesigned with the dual-polarized antenna to improve the axis ratio (AR) at wide scanning angles. The polarizations are left-handed circular polarization (LHCP) in K-band and right-handed circular polarization (RHCP) in Ka-band. At the boresight, the ARs are below 3 dB within the frequency bands from 17.7 to 20.2 GHz and from 28 to 30.5 GHz. At the scanning angle of ±60°, the gain drop is less than 4.5 dB in xoz- and yoz-plane.  

Index Terms—Dual-band, dual circular-polarization (CP), scanning array antenna, wide-angle scanning.