【作者】 王祚； 李相强； 邓江； 王庆峰； 张健穹；

【Author】 WANG Zuo;LI Xiangqiang;DENG Jiang;WANG Qingfeng;ZHANG Jianqiong;School of Physical Science and Technology,Southwest Jiaotong University;

【机构】 西南交通大学物理科学与技术学院；

【摘要】 提出并设计了一种基于变容二极管的折叠式反射阵列天线。天线的主反射面为具有线极化扭转和电控调相功能的超表面,副反射面为具有极化选择功能的金属栅条,馈源为线极化喇叭天线。基于变容二极管的天线单元可通过调控正交方向的入射波分量,保持线极化扭转功能,并实现360°反射相位的连续可调,极化转换率(PCR)大于97.5%。具有极化选择功能的金属栅条折叠了电磁波路径,有效降低了剖面高度。设计了9×9排布的折叠式阵列天线,在4.15 GHz中心频率设计下,天线增益达到15.1 dBi,口径效率大于42%,有效提升了口径效率。更多还原

【Abstract】 A folded reflectarray antenna based on varactor diodes is proposed and designed.The main reflecting surface is a metasurface that achieves the functions of linear polarization conversion and electronically tunable phase modulation.The sub-reflecting surface is a metallic grating capable of polarization selectivity.A horn antenna serves as the linearly polarized feed antenna.The varactor-based units regulate the incident wave components in orthogonal directions,which not only sustains the linear polarization conversion but also enables continuous adjustment of the reflection phase within 360°.The polarization conversion ratio(PCR) exceeds 97.5%.The metallic grating with polarization selectivity folds the electromagnetic wave path,significantly reducing the profile height.A9×9 folded array antenna is designed.At the central frequency of 4.15 GHz,the antenna achieves a gain of15.1 dBi,and effectively improves the aperture efficiency which is greater than 42%.更多还原