摘要：
We present a new design for metamaterial (MM) absorber that is resonant with strong absorbance in the microwave frequency range. Our fabricated MM consists of two resonators and a metal wire that couple separately so as to absorb all incident electric and magnetic fields within a single-unit cell layer. Experiments demonstrated that the transmission coefficients (S21) are lower than -10 dB across the entire measurement frequency range, and the reflectance coefficients (S11) are about -20 dB around 10.4 GHz. The absorptivity. which can be obtained through S parameter, is greater than 98% around 10.4 GHz in experiments and 99.9% in simulations. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 877-880. 2010 Published online in Wiley InterScience (www.interscience.wiley.com). DOI:10.1002/mop.25068
作者：
Li, M. H.;Yang, H. -L.*;Hou, X. -W.;Tian, Y.;Hou, D. -Y.
期刊：
Progress in Electromagnetics Research (P IE R),2010年108:37-49 ISSN：1070-4698
通讯作者：
Yang, H. -L.
作者机构：
[Hou, X. -W.; Li, M. H.; Yang, H. -L.] Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Tian, Y.] Huazhong Univ Sci & Technol, Elect & Informat Engn Dept, Wuhan 430074, Peoples R China.;[Hou, D. -Y.] China Ship Ind Corp, Res & Dev Inst 701, Natl Key Lab EMC, Wuhan 430064, Peoples R China.
通讯机构：
[Yang, H. -L.] H;Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
In this paper, we present the design, simulation, and measurement of a dual-band metameterial absorber in the microwave region. Simulated and experimental results show that the absorber has two perfect absorption points near 11.15 GHz and 16.01 GHz. Absorption under different polarizations of incident EM waves are measured with magnitude of over 97% at low-frequency peak and 99% at high-frequency peak respectively. Current distribution at the dual absorptive peaks is also given to study the physical mechanism of power loss. Moreover, it is verified by experiment that the absorpiton of this kind of metamaterial absorber remain over 90% at the low-frequency peak and 92% at the high-frequency peak with wide incident angles ranging from 0 degrees to 60 degrees for both transverse electric wave and transverse magnetic wave.
期刊：
Microwave and Optical Technology Letters,2009年51(8):1865-1868 ISSN：0895-2477
通讯作者：
Li, Minhua
作者机构：
[Yang, Helin; Li, Minhua] Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Wen, Ding-e] Natl Key Lab EMC, Wuhan 430079, Peoples R China.
通讯机构：
[Li, Minhua] H;Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
metamaterials;left‐handed material;split ring resonator (SRR);plasma frequency;negative magnetic permeability
摘要：
Free-space microwave measurements are applied on composite metamaterials (CMMs) consisting of split ring resonators (SRRs) and wires, also known as left-handed material. Our experiments are based on a type of CMMs with unique configurations and the transmission and reflection measurements performed in free space exhibit a pass band at about 9 GHz. Simulation results are also given, which are in good agreements with experiments. The widely belief of the pass band is that the stop hands of the SRRs alone and the wires alone constitute a clear demonstration of left-handed (LH) behavior. The LH behavior only take place in the medium with simultaneously negative permittivity epsilon, and permeability mu, also called double negative materials. (C) 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1865-1868. 2009; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.24465
期刊：
2008 2ND IEEE INTERNATIONAL NANOELECTRONICS CONFERENCE, VOLS 1-3,2008年:716-+
通讯作者：
Xiao Ting
作者机构：
[Yang He-lin; Xiao Ting; Li Ming-hua] Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Zeng Fan-qing] Wuhan Univ, Coll Elect & Informat Engn, Wuhan 430072, Peoples R China.
通讯机构：
[Xiao Ting] H;Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
摘要：
This issue is numerically investigated by schematic model in which the optical scattering and aborption behavior of sphereical nanopaticle is discussed. On the basis of classics effective medium theoretical, the renormalized effective parameters have been introduced. The simulation results are presented by comparisons with effective property models, the screening effect is also discussed in alalyzing the cross-sections in different nanometric size. The phenomena of the shift in resonance frequency by varying the radii of the grain has been shown by the theoretical result.
摘要：
本文建立了考虑Pier son Moskowi tz谱分布的动态分形海面与目标的电磁散射模型.当目标的几何外形用面元和棱边模拟时,物理光学和物理绕射理论分别给出了面元和棱边的初级散射场,几何光学确定了初级散射场在海面的受照面积,受照面的物理光学积分给出了面元与海面间的复合散射.数值结果显示了目标与海面间的电磁波复合散射雷达截面的特性.
