基于3D打印的全介质宽带极化扭转超表面反射阵天线设计

Design of 3D Printing Only-Dielectric Wideband Polarization Rotating Metasurface Reflectarray Antenna

摘要: 本文提出了一种基于3D打印的全介质宽带极化扭转超表面反射阵天线。首先，提出并设计了一款新型全介质宽带极化扭转反射阵单元，它可使入射波的极化扭转90˚的同时，与其镜像结构共同提供了0˚和180˚的1-bit相位量化，在28~40 GHz频带内极化扭转率超过80%。其次，该反射阵天线采用喇叭天线作为馈源，阵面由上述1-bit反射式全介质宽带极化扭转单元构成，在馈源的照射下，通过合理设计极化扭转反射表面的反射相位，在较宽的频带内实现高增益特性。仿真结果表明，该反射超表面是在26~40 GHz宽频带内实现了极化扭转特性，天线获得了33%的3 dB增益带宽，在34 GHz获得了最大增益26.2 dBi。

Abstract: In this paper, a 3D printing only-dielectric wideband polarization rotating metasurface reflectarray antenna is proposed. Firstly, a novel only-dielectric wideband polarization rotating reflectarray element is designed, which can be used to rotate polarization of the reflective wave by 90˚ relative to that of the incident wave. The element and its mirror image can provide 0˚ and 180˚ phase shifts with 1-bit phase quantization and more than 80% polarization conversion rates in the 28~40 GHz band. Secondly, the reflectarray antenna uses a horn antenna as a feed source, and the array surface is composed of the above 1-bit reflective only-dielectric polarization rotating element. Under the irradiation of the feed, the reflection phase of the polarization rotating reflection surface is reasonably designed to achieve high gain characteristics in a wide frequency band. Simulated results show that the reflectarray achieves 33% 3 dB gain bandwidth with a peak gain of 26.2 dBi at 34 GHz.