Gain-enhanced reconfigurable radiation array with mechanically driven system and directive elements

In the artificial intelligence-driven modern wireless communication system,antennas are required to be reconfigurable in terms of size according to changing application scenarios.However,conventional antennas with constant phase distributions cannot achieve enhanced gains in different reconfigurable sizes.In this paper,we propose a mechanically reconfigurable radiation array(RRA)based on miniaturized elements and a mechanically reconfigurable system to obtain gain-enhanced antennas in compact and deployed states.A five-element RRA with a phase-reconfigurable center element is designed and analyzed theoretically.The experimental sample has been fabricated,driven by a deployable frame with only one degree of freedom to realize the size and phase distribution reconfiguration simultaneously to validate the enhanced gains of RRA.The proposed RRA can be tessellated into larger arrays to achieve higher gains in other frequency regimes,such as terahertz or photonics applications with nanometer fabrication technology.

从紧局域态解密平带

平带系统由于平带自身不存在结构,是研究由电子——电子关联导致的各种新奇物理效应的理想量子平台.因此,从理论上寻找各种新型的平带系统就十分的重要.实现一个平带的核心要素是找到系统中蕴含的紧局域激发.本文开发了一种系统的方法,从一个简单的一维链出发,通过一系列有约束的变形,得到存在一个在边缘处波函数完全相干相消激发的一个有限系统.利用该方法构造的有限系统经过简单平移和组合就可以产生各种新型二维平带系统.此时,这些被构造出来的有限系统中,边缘处波函数完全相干相消的激发就构成了这些新型二维平带系统中的紧局域态.此外,作者还证明了该方法可以扩展到准晶和多轨道平带系统的构造中,并将这种设计方法扩展到了三维平带系统的构造中.