Chen Kuang Cheng, Yang Jiun Wen, Yang Yueh-Chieh, Khin Chang Fu, Kehn M Ng Mou
Opt Express. 2017 Oct 30;25(22):27405-27414. doi: 10.1364/OE.25.027405.
The metasurface lens composing of 2D periodic metallic patches on a grounded dielectric slab possesses several advantages such as being light, low-profile, compact, and also cheap to manufacture. In this paper, a Luneburg lens synthesized by a metasurface and designated for use as a surface wave antenna is proposed. Two types of unit cell will be compared, one whose surface wave modal dispersion varies significantly with the grazing direction and another that does not. In the context of being applied as surface wave antennas, it will be shown that the Luneburg lens synthesized by the latter kind of unit cell provides improved performance as compared to the former. Several aperture sub-efficiencies of the metasurface-based Luneburg-lens antenna shall be used for the characterization of the radiation. A prototype of the designed lens antenna has also been manufactured. Measurement results agree well with theoretical predictions and the efficacy of this device over a fairly wide bandwidth has been experimentally demonstrated.
由接地介质板上的二维周期性金属贴片组成的超表面透镜具有诸多优点，如重量轻、外形低剖面、结构紧凑，且制造成本低。本文提出了一种由超表面合成的、用作表面波天线的伦伯格透镜。将比较两种类型的单元胞，一种其表面波模式色散随掠射方向显著变化，另一种则不然。在用作表面波天线的背景下，将表明由后一种单元胞合成的伦伯格透镜与前一种相比具有更好的性能。基于超表面的伦伯格透镜天线的几个孔径子效率将用于辐射特性的表征。还制作了所设计透镜天线的原型。测量结果与理论预测吻合良好，并且已通过实验证明了该器件在相当宽的带宽上的有效性。
