基于尺寸渐变超表面宽带高增益低剖面天线

设计了一种基于尺寸渐变超表面的宽带高增益低剖面天线，该天线由双层超表面和一层微带缝隙组合而成。双层超表面由分别印刷在2个介质板上的尺寸渐变六边形阵列贴片组成,贴片之间存在非等距间隙。超表面单元尺寸渐变设计能够使天线产生多个邻近的谐振点，从而展宽带宽。通过改变超表面天线尺寸结构，分析天线的宽带辐射特性。为获得最佳宽带性能，采用遗传算法优化天线几何参数。制作并测试了一款边长为43.3 mm，厚度为4.853 mm的样本天线用于验证仿真结果。实测结果显示，该天线-10 dB阻抗带宽达到了54%(3.99~6.93 GHz)，最高增益达到12.05 dB，在4~6 GHz范围内增益保持在8 dB以上。该天线实现了宽频带、高增益、低剖面的特点，适用于宽带高速率无线通信的诸多领域。

Broadband high-gain low-profile antenna based on gradient size metasurface

A broadband high-gain low-profile antenna based on gradient size metasurface is proposed. The antenna is composed of a double-layer metasurface and a layer of microstrip slot. The double-layer metasurface is composed of gradient size hexagonal array patches printed on two dielectric plates respectively. There are non-equidistant gaps between these patches. This gradient design of the metasurface unit size can generate multiple adjacent resonance points to broaden the bandwidth. The antenna''s bandwidth radiation characteristics are analyzed by changing the size and structure of the metasurface antenna. In order to obtain the best broadband performance, genetic algorithms are employed to optimize the antenna geometric parameters. To verify the simulation results, a sample antenna with a side length of 43.3 mm and a thickness of 4.853 mm is fabricated and tested. The actual measurement results show that the -10 dB impedance bandwidth of the antenna reaches 54% (3.99~6.93 GHz), the highest gain reaches 12.05 dB, and the gain remains above 8 dB in 4~6 GHz range. Therefore, the antenna realizes the characteristics of wide frequency band, high gain and low profile, and can be applied to many fields of wireless communication.