【作者】 吴昊； 汪敏； 刘丰铭； 王杰传； WU Wen；

【Author】 WU Hao;WANG Min;LIU Fengming;WANG Jiechuan;WU Wen;Key Laboratory of Near-Range RF Sensing ICs & Microsystems,Ministry of Education,School of Electronic and Optical Enigneering,Nanjing University of Science and Technology;

【机构】 南京理工大学电子工程与光电技术学院,近程射频感知芯片与微系统教育部重点实验室； Key Laboratory of Near-Range RF Sensing ICs & Microsystems,Ministry of Education,School of Electronic and Optical Enigneering,Nanjing University of Science and Technology；

【摘要】 本文提出一种X波段低雷达散射截面(RCS)圆极化缝隙相控阵,旨在满足现代雷达/通信系统对低可探测性与极化灵活性的需求。采用串联馈电设计出小型的2?2元顺序旋转缝隙子阵作为圆极化辐射单元;两次顺序旋转辐射单元及子阵构建出4?4相控阵,馈电相位同时考虑顺序旋转和波束扫描两种控制需求。此外,引入棋盘式极化转换超表面(PCM)作为宽角阻抗匹配(WAIM)层,在实现宽角扫描的同时有效降低带外RCS。最终设计出低剖面的4×4相控阵,满足VSWR<3和±40°扫描范围的带宽为10.9%,在9GHz获得边射峰值增益18.5dBic,整个工作频带轴比<3dB;RCS缩减范围从9.6GHz-20GHz,最大缩减幅度为25.2dB,平均缩减幅度在10dB以上。更多还原

【Abstract】 This paper presents an X-band phased array with circular polarization and low radar cross section(RCS),aiming to meet the demands of modern radar/communication systems for low detectability and polarization flexibility.A series-fed compact 2×2-element sequentially rotated slot subarray is designed as the circularly polarized radiating element.A4×4 phased array is constructed by applying sequential rotation twice at both the element and subarray levels,with the feeding phase considering both sequential rotation and beam scanning requirements.Furthermore,a chessboard polarization conversion metasurface(PCM) is introduced as a wide-angle impedance matching(WAIM) layer to achieve wide-angle scanning while effectively reducing out-of-band RCS.Ultimately,a low-profile 4×4 phased array is designed,achieving a10.9% bandwidth with VSWR < 3 and a scanning range of ±40°.The peak broadside gain reaches 18.5 dBic at 9 GHz,with an axial ratio below 3 dB across the operating band.The RCS reduction ranges from 9.6 GHz to 20 GHz,with a maximum reduction of 25.2 dB and an average reduction exceeding 10 dB.更多还原