无线移动终端的MIMO天线系统关键技术研究

As the channel capacity can be enhanced significantly without increasing the extra frequency spectrum and transmitting power, the MIMO technology has been one of the hot topics in mobile communication. As the important part of the MIMO system, the MIMO antenna has become the inevitable trend of wireless mobile terminal development. Aiming at the requirement of miniaturization, multiband and wideband operation for the MIMO antenna systems in the wireless mobile terminal, this project deals with the study of MIMO antenna technology, and gives an analysis from the following three aspects: first, the miniaturization design of the multiband and wideband terminal antennas; second, decoupling scheme of the multiband and wideband double elements MIMO antenna systems; third, the technique for reducing mutual coupling four elements MIMO antenna systems. By combining the latest achievement of the scholars with the research basic of the applicants, and employing multiband decoupling structure, multi-order decoupling network and theory of characteristics mode, the project aims at putting forward the novel theories and technologies for the miniaturization of the terminal antennas and reducing the coupling between the antenna elements in multiband and wideband operation. Moreover, the project will design some MIMO antenna systems for the wireless mobile terminal and provide the theory and experiment basic for the new generation wireless communication systems.

MIMO技术可在不增加额外频谱带宽与发射功率的前提下，使无线通信系统获得较高的信道容量，因而成为近年来移动通信领域关注的焦点。作为MIMO技术的重要组成部分，MIMO天线已成为无线移动终端天线系统的主要发展趋势。本项目以无线移动终端的MIMO天线技术作为研究对象，针对终端设备对MIMO天线系统所提出的小型化、多频带以及宽频带工作等要求，从多频带及宽频带终端单元天线的小型化设计、双天线MIMO系统的多频带及宽频带去耦方法、以及四天线MIMO系统的互耦减小技术三个方面展开研究。基于国内外最新相关研究成果和申请者已有的研究基础，结合多频去耦结构、多阶去耦网络和特征模式理论，对小型化无线终端天线的电磁耦合机理进行深入讨论，提出能够覆盖多频带及宽频带的MIMO天线设计方法，最终实现几种能够适应无线通信系统要求的移动终端MIMO天线，为当前4G通信技术及未来5G通信技术提供一定的理论支撑和技术储备。

在项目基金资助下，本项目对移动终端设备中小型化多频带及宽频带天线单元的设计与实现，以及终端MIMO天线的设计与实现进行了研究。具体研究成果如下：.（1）由于移动终端设备系统的有限尺寸，本项目研究了在移动终端环境下天线单元小型化的设计实现。同时，对复合左右手传输线结构应用于终端领域作了一定研究与实际验证。基于此，本项目成功设计了几款小型化、多频带终端天线单元。.（2）针对双MIMO天线的多频带及宽频带去耦方法展开了研究。通过缺陷地结构、短路寄生枝节加载、可重构技术、空间分集等去耦方式，成功构造了几款小型化、多频带、宽频、高隔离度的双MIMO终端天线。.（3）研究了终端四MIMO天线的布局对MIMO天线隔离度、阻抗匹配等的影响，并通过特征模理论分析，在对地板构造的调整后，成功实现了四MIMO天线的去耦设计。.已发表学术论文13篇，其中期刊论文12篇，会议论文1篇。申请发明专利7项，其中已授权发明专利4项。