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传统的矩形单极子天线带宽无法满足越来越多的无线通信设备的需求。基于特征模理论,通过分析天线的特征值,把表面电流分解成相应的特征电流。它可以从物理本质上研究天线的辐射机理,从而有效的指导天线设计。改进了天线结构和馈电方法,采用柔性Kapton Polyimide基板材料,设计了可穿戴的单极子天线,并用于多输入多输出天线系统,以保证信息传输的可靠性。为了降低耦合,提出了桥连开口谐振环(Bridged Split Ring Resonator,BSRR)结构,优化了它与天线的间距。仿真结果表明,S11<-10d B时的带宽为2.45GHz-13.19GHz,带宽覆盖FCC规定的UWB频段。与不加BSRR结构相比,MIMO天线之间的耦合降低了15.4785d B。
Traditional rectangular monopole antenna bandwidth can not meet the needs of more and more wireless communication devices. Based on the characteristic mode theory, the surface current is decomposed into the corresponding characteristic current by analyzing the characteristic value of the antenna. It can study the radiation mechanism of the antenna from the nature of physics, so as to effectively guide the antenna design. The antenna structure and the feeding method are improved. The wearable monopole antenna is designed by adopting flexible Kapton Polyimide substrate material and is used in a multi-input multi-output antenna system to ensure the reliability of information transmission. In order to reduce the coupling, a Bridged Split Ring Resonator (BSRR) structure is proposed, which optimizes its spacing from the antenna. The simulation results show that the bandwidth of S11 <-10d B is 2.45GHz-13.19GHz, and the bandwidth covers the FCC-specified UWB frequency band. The coupling between MIMO antennas is reduced by 15.4785d B compared to the case without BSRR.