设计了一种结合正方形和八边形环的波束扫描超材料平面反射阵列天线。相比于传统的阵列天线设计, 运用了新的相位补偿方法, 即通过组合反射阵列单元在介质基板的材料不同时得到的相位曲线实现0~360°的相位补偿, 使得阵列单元的相位曲线不需要完全覆盖0~360°, 并且采用埃尔米特插值的方式解决相位特性曲线线性度差的问题。该方法的优势是具有广泛适应性, 降低了对阵列单元的设计要求。利用这种方法设计了几款单层平面反射阵列天线, 仿真结果显示反射波束方向与预期设定值相符合, 且副瓣与主瓣都相差至少15 dB。通过调节超材料固态等离子体激励区域的范围即改变阵列单元的谐振结构, 实现了空间波束扫描, 为平面反射阵列天线的设计提供了一种新思路。

A beam scanning metamaterial planar reflective array antenna is designed by combining square and octagonal rings. Compared with the traditional array antenna design, this array antenna adopts a new phase compensation method thus by combining the phase curve obtained by the reflective array unit when the material of the dielectric substrate is different, the phase compensation from 0-360° is realized, so that the phase curve of the array unit need not to completely cover 0-360°, and Hermite interpolation way is used to make up for the poor linearity of the phase characteristics. The advantage of this method is its universality, which reduces the design requirements for the array unit. Using this method, several single-layer plane reflectarray antennas were designed. The simulation results show that the direction of the reflected beam is consistent with the expected setting, and the side lobe and the main lobe are at least 15 dB apart. By adjusting the range of the solid-state plasma excitation region of the metamaterial to change the resonance structure of the array unit, beam scanning in different spatial frequencies is achieved, which provides a new method for the design of the planar reflectarray antenna.