高增益反射型超表面多波束双频天线设计

Design of High Gain Reflecting Metasurface Multi-beam Dual-band Antenna

提出了一种高增益多波束双频天线,通过超表面的电磁调控特性实现在双频段的波束聚焦和波束偏转。所设计的多波束双频天线由反射型超表面和双频微带天线两部分组成。为实现焦距为40 mm的波束聚焦和±30°波束偏转,将双频微带天线放置在超表面下方40 mm的水平面上。根据天线上方相位近似于0和π的两个超表面单元合理排布,天线位于焦点正下方时在14.5 GHz和22.7 GHz实现了波束聚焦,天线偏离焦点±35 mm处时在14.5 GHz和22.7 GHz实现了±30°波束偏转。仿真结果表明,不同位置天线在双频段实现了不同的波束调控效果,相较于没有超表面时,天线低频段内增益增大了11.56~14.03 dBi,高频段内增益增大了10.74~13.07 dBi。所设计的超表面天线实现了在双频段的高增益、波束调控性能。

A high gain multi-beam dual-frequency antenna is proposed to achieve beam focusing and beam deflection in dual-frequency band by means of the electromagnetic control characteristics of metasurface.The designed multi-beam dual-frequency antenna consists of two parts:reflective metasurface and dual-frequency microstrip antenna.To achieve beam focusing with a focal length of 40 mm and±30°beam deflection,the dual-frequency microstrip antenna is placed on a horizontal plane 40 mm below the metasurface.According to the rational arrangement of two metasurface elements whose phase is approximately 0 andπabove the antenna,beam focusing is achieved at 14.5 GHz and 22.7 GHz when the antenna is directly below the focus,and±30°beam deflection is achieved at 14.5 GHz and 22.7 GHz when the antenna is±35 mm away from the focus.The simulation results show that the antenna at different positions can achieve different beam control effects in the dual frequency band.Compared with the non-metasurface antenna,the gain of the antenna in the low frequency band is increased by 11.56~14.03 dBi,and the gain in the high frequency band is increased by 10.74~13.07 dBi.The designed metasurface antenna achieves high gain and beam control performance in dual frequency band.