An effective approach to expand the bandwidth of negative permeability of small-sized planax materials is proposed. Based on qualitative analysis of equivalent circuit models, the fractional bandwidth of an μ-negati...An effective approach to expand the bandwidth of negative permeability of small-sized planax materials is proposed. Based on qualitative analysis of equivalent circuit models, the fractional bandwidth of an μ-negative （MNG） material is expanded from 3.53% up to 12.87% by adding split-ring resonators （SRRs） and arranging them by proposed steps. Moreover, the experimental results validate the effectiveness of bandwidth-expanding methods, which is promising for the extensive application of metamaterials in the microwave field.展开更多
文摘超宽带(Ultra-Wideband,UWB)在无线通信、雷达探测与成像、无线传感网络等领域具有广阔的应用前景。由于UWB脉冲信号的频带宽、时间宽度窄,高速采样已成为制约UWB无线系统快速发展的一个重要的技术瓶颈。压缩感知(Compressive Sensing or Compressed Sensing,CS)是一种新型的信号采样和复原理论,不受传统采样定律限制,能以远低于Nyquist-Shannon采样定律要求的速率,对可压缩信号进行精确的采样、量化、编码和复原。CS理论的出现为UWB信号采样提供一种全新的技术解决方案。依据CS基本原理及其在UWB系统应用中的最新研究进展,重点探讨了两种新型的基于CS的UWB信号采样系统,同时分析和讨论了CS在UWB系统应用中的关键技术及未来发展趋势。文中的分析和讨论对进一步深入研究基于CS的UWB系统有一定的参考指导作用。
基金Project supported partially by the National Natural Science Foundation of China (Grant Nos. 60872034 and 60971029)the New-Century Talent Program of the Education Department of China (Grant No. NCET070154)+1 种基金the National Defense Research Funding (Grant No. ZJ10DZ02111)the Hi-Tech Research and Development Program of China (Grant No. 2009AA01Z231)
文摘An effective approach to expand the bandwidth of negative permeability of small-sized planax materials is proposed. Based on qualitative analysis of equivalent circuit models, the fractional bandwidth of an μ-negative （MNG） material is expanded from 3.53% up to 12.87% by adding split-ring resonators （SRRs） and arranging them by proposed steps. Moreover, the experimental results validate the effectiveness of bandwidth-expanding methods, which is promising for the extensive application of metamaterials in the microwave field.
