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基于超材料的相位补偿特性实现特定波段超材料滤波器设计。本工作通过变形传统的互补型开口谐振环,设计了一种小型化哑铃型缝隙结构超材料滤波器,通过二极管控制超材料的电磁特性在不同时间的空间分布形式,以实现空间滤波器中心频率可调。滤波器单元尺寸为5.0 mm×5.0 mm×0.8 mm,具有小型化的特点。仿真结果表明:-10 dB工作带宽为28%(9.2~12 GHz),回波损耗最小值为29 dB,插入损耗最大值为0.8 dB。测试结果表明:-10 dB工作带宽为25%(9.2~11.7 GHz),回波损耗最小值为20 dB,插入损耗最大值为1.0 dB。 相似文献
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针对表述性状态传递(REST)架构本身安全机制不够完善的问题,提出基于攻击图的REST架构安全分析与评估,利用攻击图实现了对REST架构的安全性量化评估。首先,对REST架构可能受到的攻击进行了预测,据此构造了REST架构攻击图模型,并计算了攻击可能性指标和攻击实现度指标。然后,针对攻击图中的攻击状态及攻击行为,提出了安全防护措施,据此重新构造了REST架构攻击图模型,并计算了攻击可能性指标和攻击实现度指标。经比较,采用安全防护措施后,攻击可能性指标降低至原来的约1/10,攻击实现度指标降低至原来的约1/86。比较结果表明,所构造的攻击图模型能够对REST架构的安全性能进行有效的量化评估。 相似文献
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By designing the ordered structure on the key physical dimensions, metamaterial can obtain extraordinary physical properties. The method gives transparent conductive absorbing metamaterial with broadband and high absorptivity. In this paper, a kind of absorbing metamaterial with indium tin oxide (ITO) glass substrate is designed. The design method of double-sided etched an open loop and linear metamaterial periodic structures is adopted. The thickness of the absorbing metamaterial is 2.5 mm. The research shows that the working bandwidth is between 8.9 GHz and 17.4 GHz, the absorption rate is 90%, and the transmittance of visible light is 85% on average. The absorbing metamaterial has wide application value to solve the problem of visualization and absorption characteristics. 相似文献
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A tunable metamaterial filter is designed based on split-ring resonators (SRRs) in this paper. The metamaterial filter has a compact size of 15 mm×20 mm, and miniaturization is realized by using the SRRs. By loading tunable devices, the continuous operation of the filter is realized at X band (from 10.7 GHz to 12 GHz), the bandwidth is about 13%, the minimum return loss is 35 dB, and the maximum insertion loss is 0.37 dB. The results illustrate that the metamaterial filter shows the compact size, wide bandwidth and good band pass characteristics. This work has been supported by the Key Laboratory Foundation of China Electronics Technology Group Corporation (No.ZX15ZS391), the National Fund for International Cooperation in Science and Technology (No.2014DFR10020), and the Natural Science Foundation of Shanxi Province (Nos.2014021020-1 and 2015021083). E-mail:798710363@qq.com 相似文献
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本文介绍了填充型导热绝缘高分子材料的导热机理,讨论了影响填充型导热绝缘高分子材料导热性能的主要因素,展望了导热绝缘高分子材料的发展方向。 相似文献
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This paper presents a compact triple-band bandpass filter based on metamaterials. The miniaturization is realized by the principle of phase compensation of metamaterial. Compared with the conventional half-wavelength filter, the metamaterial filter has a small size of 10 mm×10 mm. The triple-band bandpass filter performance has been validated by the electromagnetic simulation software of high frequency structure simulator(HFSS). The results illustrate that the filter is designed with center frequencies of 2.4 GHz, 5.1 GHz and 8.8 GHz, bandwidths of about 7.9%(2.31—2.50 GHz), 7.8%(5.0—5.4 GHz) and 7.4%(8.50—9.15 GHz), respectively, and it shows good band pass characteristics. 相似文献
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为了合理评估磁屏蔽体对低频磁场的屏蔽效果,设计了一种磁屏蔽体并提出一种屏蔽方案,计算静磁场与交变磁场共同影响下,其屏蔽装置对其屏蔽性能的影响,并通过实验来论证该屏蔽体和设计方案在实践中的应用可行性。实验结果表明,设计的电磁屏蔽室,室内静磁场B≤200 n T,50 Hz交流磁场干扰<0.10μT;大于100 k Hz交流磁场屏蔽系数S≥1 000;满足磁传感器系统等相关仪器的实用要求,为实践屏蔽室屏效验收提供理论依据。 相似文献
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