基于可控超材料的近场隔离方法研究

Near field isolation between antennas has practical significance for communication systems electromagnetic compatibility (EMC). With the rapid development of novel metamaterials in recent years, many novel structures are applied in this area and remarkable results are achieved. However, currently almost all the reported researches are based on static metamaterials which means they are not controllable. Significant higher isolation ratio is achieved during our exploratory experiments when using tunable matematerial in the near field. However these results are achieved by experimental investigation and optimization. The theory of this phenomenon is not clear nor the mathematical modle. Also, the bandwidth that achieved high-level isolation is narrow band, which is not practically usable. Thus, this project focuses on the theoretical explanation behind this novel phenomenon and tries to find an approximate analytical solution. Also, the extension of isolation band is another goal. New method of shielding EM signal in the near field region is probably achieved during this project.

天线近场隔离对于通信及电磁兼容具有重要的实际意义。近年来随着超材料的发展,这种新颖的电磁材料用于近场屏蔽时取得了良好的效果。然而这些研究几乎都是利用静态的不可控材料实现的。申请人在前期的探索性研究中利用可控超材料在天线近场(0.8倍波长)实现了更高的隔离度(超过110dB)。然而这一结果仅是通过实验和优化得到的，并没有完善的理论支撑和数学模型。同时能够隔离的带宽很窄，目前还不具有实用性。因此,本项目针对这一新而过展开理论研究,以探明其中机理并给出近似的解析解;在此基础上研究拓展隔离带宽的方法。通过该项目的研究可以为电磁屏蔽尤其是处于近场的电磁屏蔽提供新的手段。

在本基金支持下，本项目针对可控超材料进行近场电磁控制进行了研究。申请人在前期研究的基础上进一步研究了可控超材料的物理性质与数学模型，对谐振模式可控超材料进行了较为深入的理论分析并提出了等效电路与数学模型；研究了可控超材料进场电磁调控的幅度相位特性，并探索了可控超材料与人工智能结合的可行性进而实现了一种低成本的灵活360°电扫描天线；对基于变容二极管的连续可调可控超材料的耦合机制进行了理论探索，提出了强耦合设计理论并实现了超宽可调范围的有源频率选择表面实现了整个L波段的谐振调控。