论文名称为“Generating and steering quasi-nondiffractive beam by near-field planar Risley prisms”。该文针对准无衍射波束二维扫描的应用需求，研究了机械旋转式准无衍射波束二维扫描天线，并提出了可生成准无衍射波束并实现波束扫描的近场 Risley 棱镜天线数学模型及设计准则。基于近场数值计算方法对数学模型进行了仿真验证，证明了该模型的准确性和有效性，开展了误差分析并评估其对准无衍射波束的影响。采用双层宽带宽角色散补偿移相表面作为波前调控表面以实现准无衍射波束的二维扫描。最后进行实验验证，实现了准无衍射波束在俯仰角 0°~60°，方位角 0°~360°范围内的前半空间二维扫描。该天线的设计原则和过程在文章中进行了详细介绍，工作主要完成人钟熠辰、程钰间。

论文链接：https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9109729

Abstract— A phase shift surface (PSS) antenna launching steerable quasi-nondiffractive beam is proposed in this article. The principle of the far-field beam-steering antenna using the Risley prism is introduced to the near-field nondiffractive beam antenna. To match the specific phase distribution requirement of the scanning quasi-nondiffractive beam, the linear phase shift distribution on the Risley prism is reconstructed as a nonlinear one. The quasi-nondiffractive beam with considerable and stable depth of field can be steered within the front hemisphere of the antenna by mechanically rotating two PSSs. A prototype antenna is fabricated and its near-field patterns are measured. The scanning range of the beam is from 0◦ to 54◦ in zenith and from 0◦ to 360◦ in azimuth. The beam’s direction and its depth of field remain stable within the frequency band of 27–29 GHz. The beam maintains accurate direction and stable depth of field during the steering process.

Index Terms— Beam steering, near-field antenna, nondiffractive beam, phase shift surface (PSS) antenna.