二维全介质超材料设计与涡旋波应用研究

随着通信技术的发展，频率拥挤问题日益突出。涡旋电磁波由于能够拓展频谱利用率而成为当前研究热点。目前，现有涡旋波天线在结构、损耗、发散角等方面具有一定的局限性。本项目拟采用超材料的设计思路将二维全介质超材料与涡旋波天线结构相结合，制备出具有低损耗、小型化、宽带可调谐的二维全介质超材料涡旋波天线。首先，进行二维全介质超材料的结构设计和性能优化；探索出多种结构简单、高性能、利于后续涡旋波天线设计的二维全介质超材料；其次，将二维全介质超材料应用于涡旋电磁波天线设计中，实现涡旋波天线的小型化设计；再次，探索介质材料可调方法，研究外场条件对介质超材料电磁性能的影响规律，设计出基于可调二维全介质超材料的涡旋波天线；最终，进行涡旋波天线器件的制备、表征与性能研究，通过合理的优化设计，制备出高性能的二维全介质超材料涡旋波天线，为涡旋波天线的研究开辟新的方向。

With the development in the communication technology, the utilization of frequency spectrum should be improved. The orbital angular momentum (OAM) beam has become the current research hotspot due to its characteristics of expanding spectrum utilization. Up to now, the present OAM antennas have some limitations in terms of structure, loss and divergence angle. In this project, we focus on the two-dimensional all-dielectric metamaterial OAM antennas with low loss, miniature and wide adjusting range. First, the two-dimensional all-dielectric metamaterials will be designed and optimized. Through the structure optimization design of metamaterials, various two-dimensional all-dielectric metamaterials with simple structure and well performance will be realized. These metamaterials are suitable for combination with OAM antenna design. Second, the miniaturization designs will be achieved by using the two-dimensional all-dielectric metamaterial structures. And then, the tunable mechanism of the two-dimensional all-dielectric metamaterials will be studied. The OAM antennas based on tunable two-dimensional all-dielectric metamaterial will be designed. Finally, the tunable two-dimensional all-dielectric metamaterial OAM antennas will be fabricated and their electromagnetic properties will be studied. This project offers new directions for the design of OAM antennas.