基于超表面的宽带超低剖面折叠透射阵

Wideband Ultralow-profile Folded Transmitarray Based on Metasurface

该文提出了基于超表面的宽带超低剖面折叠透射阵天线设计方法。该天线由两种超表面阵列和一个作为馈源的开口波导构成。其中,下层超表面能够将馈源发射的线极化入射波转换为交叉极化反射波,上层超表面能够实现特定线极化波的全反射和另一种线极化波的全透射。通过合理设计,该天线能够将辐射电磁波来回反射3次并在较宽频带内实现增益提升,同时其剖面高度能够降至传统透射阵的1/4。天线实测和仿真结果吻合良好,表明3 dB增益带宽达到19.6%(9.2~11.2 GHz),且9.6 GHz处峰值增益达21 dBi,峰值口径效率为30%。该文设计方法为实现宽带低剖面阵列天线设计提供了新思路。

This paper proposes a novel design strategy for wideband ultralow-profile Folded TransmitArray(FTA)antenna using metasurfaces.It consists of two kinds of metasurfaces and an open waveguide antenna as the feed source.The bottom metasurface is applied to transforming the linearly polarized wave coming from feed antenna into its cross-polarized reflected ones.Meanwhile,the top metasurface is capable of reflecting one linearly polarized wave and transmitting the other orthogonal counterpart.With smart design,the proposed FTA can reflect the electromagnetic wave back three times between two metasurfaces and realize high gain performance within a wide frequency band,and its profile height is decreased to 1/4 that of conventional transmitarray.The simulated and measured results are basically consistent,which demonstrates a 3 dB gain bandwidth of 19.6%(9.2~11.2 GHz),a peak gain of 21 dBi and a peak aperture efficiency of 30%at 9.6 GHz.The proposed design offers a new avenue for wideband low profile array antenna.