基于磁介电材料的小型化宽频带高阻表面研究

With the development of modern microwave technologies, the wireless equipments are becoming smaller and smaller,which will make the problems of radio frequency (RF) circuits and devices miniaturization and electromagnetic compatability more and more difficult.High impedance surfaces (HIS), with their characteristics of forbidden band gap and in phase reflection, can be used as an effective method to reduce the electromagnetic interference. Moreover, the high impedance surface can improve the antenna radiation patterns and decrease the profile of antennas. However, this has been challenging to achieve miniaturized high impedance surfaces for the miniaturization of the wireless communication circuits and systems since the HIS need a periodic structure,especially at low microwave frquencies.With their high relative permeability,magneto-dielectric materials show great potential in the design of miniaturization and wideband of RF devices. In this study,magneto-dielectric materials are adopted as the high impedance surface substrate to realize the design of miniaturization and wideband devices.The analysis and simulation in a combined fields and circuits method of high impedance surfaces with magneto-dielectric substrate will be presented. The fabrication process of magneto-dielectric materials,the method of design and optimization for different types of HIS's minizaturization and wideband will be summarized.Experiments will be carried out to verify the accuracy of the design of miniaturized and wideband high impedance surfaces. The techniques of modeling,simulation and experiments will be provided for the high impedance surfaces with magneto-dielectric substrates, moreover,the methods of design and optimization for the miniaturized and wideband high impedance surfaces will be investigated, which will lay a solid foundation for the high impedance surface with magneto-dielectric substrate's development and application in the wireless communication.

随着现代科技不断发展,无线设备越来越小型化,射频电路和器件的小型化与电磁兼容问题越来越严峻。高阻表面结构由于具有带阻特性和同相反射的优越性能,可以有效减小电磁干扰、改善天线的辐射特性、减小天线的剖面。然而,由于高阻表面需要周期性的结构,其自身的小型化和宽频带问题已成为制约无线设备和系统小型化的关键因素之一。磁介电材料的高磁导率特性可以极大增加器件的等效电感值，实现射频器件小型化宽频带设计。本项目拟采用磁介电材料作为基板对高阻表面的小型化宽频带展开研究。包括：研究基于磁介电材料高阻表面的场-路结合分析和仿真方法；磁介电材料的研制与不同类型高阻表面的小型化宽频带设计和优化方法；最后通过实验验证高阻表面的小型化宽频带设计。本项目将为基于磁介电材料的高阻表面研究提供一整套建模、仿真和验证技术,并提出实现小型化宽频带高阻表面的设计和优化方法，为磁介电材料高阻表面在无线通信中的发展和应用奠定基础。

无线设备中微波器件和射频电路的小型化和宽频带问题越来越严峻。磁介电材料的高磁导率特性可以极大增加器件的等效电感值，实现微波器件小型化、宽频带设计。本项目研制了适用不同频率范围的磁性材料和磁介电材料，研究了基于磁介电材料的高阻表面和微波器件的场路结合分析和仿真方法，并对基于磁介电材料的微波器件和高阻表面的小型化、宽频带和可调谐展开研究，通过实验验证了微波器件和高阻表面的小型化宽频带设计。本项目研发出基于有限元分析的磁介电材料小型化宽频带高阻表面和微波器件的场路相结合的仿真方法，并采用Spin-spray工艺研制了NiCo磁性薄膜材料,并与Rogers介质材料相混合后研制出F/R/F三明治结构的磁介电材料，利用该磁介电材料成功研制出小型化宽频带微波移相器，可以实现在20GHz频率可实现0度/cm-192度/cm的可调相移度；本项目采用PVD工艺研制出了YIG-GGG-YIG单晶薄膜磁性材料和YIG/PZN-PT Multiferroic多铁电材料并应用于磁电联合可调带通滤波器设计，最大相对可调谐度为54%，可以实现最大带宽为57MHz；本项目结合分形结构研发出小型化宽频带高阻表面，并将天线加载在高阻表面实现低剖面小型化高增益天线设计，高阻表面±90度反射相位带宽为1.18-2.77GHz，相对带宽为73%。本项目提出并实现了小型化、宽频带高阻表面和微波器件的设计和优化方法，为磁介电材料微波器件在无线通信中的发展和应用奠定了基础。.项目按照原计划执行，顺利地完成了项目目标。