Ratni Badreddine, de Lustrac André, Piau Gérard-Pascal, Burokur Shah Nawaz
Opt Express. 2018 Feb 5;26(3):2613-2624. doi: 10.1364/OE.26.002613.
A planar metasurface composed of electronically tunable meta-atoms incorporating voltage-controlled varactor diodes is proposed as a reconfigurable meta-mirror for wavefronts control in microwave antenna applications. The dispersion responses of the cells are individually tailored in the reconfigurable metasurface so as to overcome the bandwidth limitations of passive metasurfaces and also to control the phase characteristics. By controlling the bias voltage of the varactor diodes on the planar metasurface, the phase characteristics of reflectors can be engineered. The reconfigurable meta-mirror is utilized to implement three different types of reflectors. As such, a reflectarray, a cylindrical parabolic reflector and a dihedral reflector are numerically verified in microwave regime through finite element method. Moreover, experimental measurements are performed on a fabricated prototype to validate the proposed device. Frequency agility, beam deflection and beam focusing are the main functionalities demonstrated from the proposed reconfigurable meta-mirror.
提出了一种由包含压控变容二极管的电子可调谐元原子组成的平面超表面，作为用于微波天线应用中波前控制的可重构元镜。在可重构超表面中，单元的色散响应被单独定制，以克服无源超表面的带宽限制，并控制相位特性。通过控制平面超表面上变容二极管的偏置电压，可以设计反射器的相位特性。利用可重构元镜实现了三种不同类型的反射器。因此，通过有限元方法在微波频段对反射阵列、柱面抛物面反射器和二面角反射器进行了数值验证。此外，对制作的原型进行了实验测量，以验证所提出的器件。频率捷变、波束偏转和波束聚焦是所提出的可重构元镜展示的主要功能。
