论文名称“A Single-Layer Broadband Linear-to-Circular Polarization Reflectarray With 45° Offset Feed for Ka-Band Communications”，毫米波宽带反射阵列集合了平面阵列天线和抛物面天线所具有的高增益、低成本、重量轻、灵活性好、频谱资源丰富和大通信容量的优点，因此适合用于高速列车的通信。为了进一步优化反射阵，推广反射阵在高速列车通信中的应用，本文提出了一种基于单层介质基板的毫米波宽带圆极化反射阵列，该阵列使用线性极化（LP）源，在45°入射/反射条件下工作。阵列单元由耶路撒冷十字和四条带有端部电容加载的直线组成，提供了360°的相位范围，并在宽频带内表现出线性相位响应。当TM和TE极化波以大角度入射/反射时，分别产生额外的T形和环形谐振，导致阵列性能下降。在这种情况下，通过将具有相位畸变的单元尽可能远离反射阵列表面的中心来减少T形谐振的影响。同时，通过选择特定的相位曲线以平均相位补偿差异，从而减小环形谐振的影响。随后，设计、制造并测量了一个24×24单元的反射阵列。测量结果与仿真结果有很好的一致性。测得的1 dB增益带宽和3 dB轴比带宽分别为13.9%和28.8%。峰值增益为26.22 dBi，在37.5 GHz时口径效率为32.1%，这一性能与45°入射/反射条件下的优秀线性极化反射阵列相当。工作主要完成人：王佳鑫，王洪斌，程钰间。

论文链接：https://ieeexplore.ieee.org/document/10284985

Abstract—A millimeter-wave broadband circularly polarized reflectarray with a linearly polarized (LP) source at 45° incidence/reflection based on a single-layer dielectric substrate is introduced. The array element consists of a Jerusalem cross and

four straight strips with the end capacitive loading, which provides a 360° phase range and shows a linear phase response in the wide frequency band. When TM and TE polarized waves are incident/reflected at large angles, the additional T-shaped and loop-shaped resonances are generated, respectively, causing the array performance to deteriorate. In this case, the influence of the T-shaped resonance is reduced by arranging elements with phase distortion as far away from the center of the reflectarray surface as possible. Meanwhile, the impact of the loop-shaped one is diminished by choosing the specific phase curve to average the phase compensation discrepancy. Then, the reflectarray with 24×24 cells is designed, fabricated, and measured. The measured results have a good agreement with the simulated ones. The measured 1 dB gain and 3 dB axial ratio bandwidths are 13.9% and 28.8%, respectively. The peak gain is 26.22 dBi at 37.5GHzand the aperture efficiency is 32.1%, which is comparable to that of the excellent LP reflectarray at 45° incidence/reflection.

Index Terms— 45° incidence/reflection, broadband, linear-to-circular polarization reflectarray, millimeter-wave, single layer.