基于智能超表面的二维相扫天线

Two-dimensional Phase-scan Antenna Based on RIS

针对传统相控阵天线设计复杂、成本高昂等问题,提出了基于智能超表面(Reconfigurable Intelligent Surface, RIS)的空间馈电二维相扫天线。该天线通过RIS技术对来自馈源的电磁波进行相位操纵,实现了天线高增益和天线波束的可重构。与传统相控阵天线相比,该天线具有结构简单、成本低廉、剖面极低等特点。天线原型由一块含有1 024个单元的超表面阵列、驱动模块及自支撑馈源组成,其中超表面阵列通过现场可编程门阵列(Field Programmable Gate Array, FPGA)来实时控制以满足天线波束快速切换、方向图二维实时重构等需求。超表面单元两种调控状态在6.5~10.0 GHz具有低于0.5 dB的幅度损耗,在7~10 GHz频带范围内反射相位差在180°±5°以内。天线原型在7.7、8.0、8.3 GHz的测试增益为24.72、24.92、25.06 dBi。天线±60°扫描增益滚降低于4 dB。

In order to solve the problems of complex design and high cost of traditional phased array antennas,a space-fed two-dimensi onal phase-scan antenna based on Reconfigurable Intelligent Surface(RIS)was proposed.The antenna uses RIS technology to manipulate the electromagnetic incoming waves from the feed,which realizes high gain and reconfigurability of the antenna beam.Compared with traditional phased array antennas,this antenna has the characteristics of simple structure,low cost and low profile.The antenna prototype consists of a metasurface array containing 1024 cells,a driver module and a self-supporting feed,in which the m etasurfa ce array is controlled in real time through Field Programmable Gate Array(FPGA)to meet the requirement of rapid antenna beam switching and two-dimensional real-time reconstruction of the pattern.Two control states of the metasurface unit have amplitude loss of less than 0.5 dB from 6.5 GHz to 10.0GHz,and the reflected phase difference is within 180°±5°in the frequency band range from 7 GHz to 10 GHz.The antenna p rototype tested gains are 24.72 dBi,24.92 dBi and 25.06 dBi respectively at 7.7 GHz,8.0 GHz,and 8.3 GHz.The antenna±60°scan loss is down to 4 dB.