作者机构：
College of Physical Science and Technology, Central China Normal University, Wuhan 430079, Hubei Peo
会议名称：
2013 International Symposium on Antennas and Propagation(2013天线与传播国际会议)
会议时间：
2013-10-23
会议地点：
南京
会议论文集名称：
2013 International Symposium on Antennas and Propagation(2013天线与传播国际会议)论文集
摘要：
An enhanced broadband metamaterial based on lumped elements is presented.The structure is composed of lumped elements and two conductive layers with a single substrate (FR-4) between them.The simulation results show that the bandwidth of absorption of 80% is about 10.58 GHz and the full width at half maximum (FWHM) can be up to 92%.The further simulations of the proposed MA can operate at a wide range of incident angles under both transverse electric and transverse magnetic polarizations.
作者机构：
College of physical Science and Technology, Central China Normal University Wuhan 430079, Huibei People's Republic of China
会议名称：
2013 International Symposium on Antennas and Propagation(2013天线与传播国际会议)
会议时间：
2013-10-23
会议地点：
南京
会议论文集名称：
2013 International Symposium on Antennas and Propagation(2013天线与传播国际会议)论文集
摘要：
A metamaterial (MM) resonator composed of double V-shape metal wires shows the different manipulations of the transmission and reflection.Parametric studies on the MM reveal that it can work as dual-direction absorber or polarization transformer based on the electric and magnetic resonance between the metal layers.The investigation shows that the absorption of MM resonator is 953% at 12.1GHz; and the MM resonator can turn vertical polarized EM waves into horizontal polarized EM waves with polarization conversion ratio (PCR) of78% at 10.2 GHz.The potential application for microwave dualdirectional ideal absorbing and polarization transformation are discussed respectively.
会议名称：
11th International Symposium on Antennas, Propagation and EM Theory (ISAPE)
会议时间：
OCT 18-21, 2016
会议地点：
Guilin, PEOPLES R CHINA
会议主办单位：
[Huang, Xiaojun;Yu, Shengqing] Kashgar Univ, Coll Phys & Elect Engn, Kashgar, Peoples R China.^[Chen, Jiao;Yang, Helin] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.
关键词：
ultra-broad band metamaterial absorber;effective medium
摘要：
We demonstrate the design, measurement, retrieval effective parameters and calculations of an ultra-broad band metamaterial absorber (MMA), in which the metallic resonant structures including the inserted chip resisters and the substrate are equivalent to a homogeneous and isotropic effective medium. The effective electromagnetic (EM) parameters are retrieved by extracting the reflected and transmitted coefficients, and absorbance of the MMA is calculated by the retrieved effective EM parameters based on effective medium theory. The calculated results are in good agreement with simulations and experiments.
期刊：
Journal of Physics D: Applied Physics,2016年49(32):325101 ISSN：0022-3727
通讯作者：
Yang, Helin
作者机构：
[Yu, Shengqing; Huang, Xiaojun; Lou, Yanchao] Kashgar Univ, Coll Phys & Elect Engn, Kashgar 844000, Peoples R China.;[Yang, Helin; Huang, Xiaojun; Guo, Ling] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Wang, Danqi] Xinjiang Normal Univ, Coll Phys & Elect Engn, Urumqi 830054, Peoples R China.
通讯机构：
[Yang, Helin] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
wideband;metamaterial absorber;equivalent medium
摘要：
Metamaterial absorbers (MMAs) have drawn increasing attention in many areas due to the fact that they can achieve electromagnetic (EM) waves with unity absorptivity. We demonstrate the design, simulation, experiment and calculation of a wideband MMA based on a loaded double-square-loop (DSL) array of chip resisters. For a normal incidence EM wave, the simulated results show that the absorption of the full width at half maximum is about 9.1 GHz, and the relative bandwidth is 87.1%. Experimental results are in agreement with the simulations. More importantly, equivalent medium theory (EMT) is utilized to calculate the absorptions of the DSL MMA, and the calculated absorptions based on EMT agree with the simulated and measured results. The method based on EMT provides a new way to analysis the mechanism of MMAs.
摘要：
A three-layer bi-anisotropic metamaterial (B-AM) is proposed to realize a 900 polarization rotator in an ultra-broadband frequency range of 5.8-11.8 GHz, which can convert the linearly polarized wave into its cross-polarized wave for propagating directions. Simulated and measured results show that the ratio of polarization conversion (PCR) of the three-layer B-AM is nearly 90% and FWHM is more than 68%. In addition, the three-layer B-AM can achieve asymmetric transmission (AT) for forward and backward propagations of linearly polarized waves. The proposed three-layer B-AM has simple geometry and wider operating frequency bands comparing to the previous designs. The physical mechanism of the ultra-broadband linear polarization conversion effect is illustrated by simulated surface current distributions of the structure. (C) 2014 Elsevier B.V. All rights reserved.
摘要：
The transmission characteristics of a planar metamaterial, composed of two finite metal strips (with different length) and one double split-ring resonator, have been numerically and experimentally investigated in this paper. By varying the length of the two strips slightly, this structure can exhibit single-band and dual-band electromagnetically induced transparency (EIT)-like spectral response in microwave region. The dark mode can be excited because of the length difference of the two metal strips, which can lead to a very asymmetric Fano-like resonance or gradually EIT-like profile in transmission. So the dual-band EIT-like physical mechanism is characterized by two bright-dark coupling modes. Our work provides a way to obtain multiple EIT-like effect, and it may achieve potential applications in a variety of fields including filters, sensing, and some other microwave devices.
作者：
Guo, Linyan;Xiao, Boxun;Li, Minhua;Yang, Helin*;Lin, Hai
期刊：
Journal of Electromagnetic Waves and Applications,2015年29(5):693-702 ISSN：0920-5071
通讯作者：
Yang, Helin
作者机构：
[Lin, Hai; Yang, Helin; Guo, Linyan] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Xiao, Boxun] Yangtze Univ, Geophys & Oil Resources Inst, Wuhan 430100, Peoples R China.;[Li, Minhua] Ningbo Univ, Coll Informat Sci & Engn, Ningbo 315211, Zhejiang, Peoples R China.
通讯机构：
[Yang, Helin] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
bow tie antenna;epsilon-negative metasurface;frequency-tunable;high gain
摘要：
Various wireless communication systems require simple and high-gain radiating element operating in different working frequency bands. In this paper, an epsilon-negative metasurface antenna (ENG-MS antenna) with high-gain and frequency-tunable properties is proposed, fabricated and studied. This antenna is composed of an original double-sided printed bow tie antenna (source antenna) and an ENG-MS frequency selecting reflection layer. The strong electric interaction between ENG-MS (allowing evanescent wave only) and source antenna exhibits a significant effect on antenna’s radiation pattern and gain. Antenna’s gain can be selectively enhanced over the source antenna’s working frequency band. It is demonstrated that the resonant frequencies of this ENG-MS antenna can be continuously tuned by changing the distance between source antenna and ENG-MS. The proposed ENG-MS antenna in this paper shows a promising result to introduce metamaterials/metasurfaces in microwave device to realize high-gain and frequency-tunable functionality.
摘要：
A three-layered deformed F-shaped metamaterial reflective polarization converter (RPC) is proposed to realize linear and circular polarization conversions. The proposed F-shaped RPC can convert a linearly polarized wave to its cross-polarized wave at the four resonant frequencies. It also can convert the linearly polarized wave to a circularly polarized wave at the other four resonant frequencies. In addition, the proposed F-shaped RPC can maintain the same rational direction at the five resonant frequencies when the incident is a circularly polarized wave and higher reflective coefficients can be obtained with the increase of the thickness of the dielectric layer. The simulated and measured results are in agreement in the entire frequency range, and the polarization conversion ratio is more than 85% for both linear and circular polarizations. Further simulations reveal that the polarization in the terahertz range can also be obtained by changing the thickness of the dielectric layer and the unit of the reflective polarization converter.
摘要：
Near-field coupling between orthogonally twisted bright and dark mode resonances gives rise to sharp Fano-like resonances and electromagnetically induced transparency. We demonstrate that by varying the orientation of the near-field coupled bright and dark metamolecule with respect to the incident electric field, the shape and linewidth of the coupling induced transparency could be easily engineered. This particular aspect of the near-field coupled metamolecules could lead to engineered slow-light devices, narrow bandpass filters and ultrasensitive sensors.
摘要：
The simplified multireflection interference theory is proposed to analyze the physical insight quantitatively of the ultra-broadband metamaterial absorber (MMA) loading lumped resisters in which the resonant layer, including lumped resisters and the substrate, are equivalent to a homogeneous and isotropic effective medium. The simulated full width at half maximum (FWHM) absorption bandwidths is approximately 11.2 GHz with relative FWHM absorption bandwidths of 116.7% for a normal incidence electromagnetic wave. Microwave experiments are performed and measured results are in good agreement with the numerical results. The absorbance of the proposed MMA calculated by the simplified multi-reflection interference theory coincides well with simulated and measured results.
摘要：
In this article, we numerically and experimentally investigate the electromagnetic responses of multiple-band reflective polarization based on complementary L-shaped metamaterial. The proposed reflective polarization converter can convert a linearly polarized wave to its cross-polarized wave at the five resonant frequencies, which is also can convert the linearly polarized wave to circularly polarized wave at other six resonant frequencies. Furthermore, the incident circularly polarized wave can be transformed into the same rotational direction at five resonant frequencies after reflection, which is different from reflection by conventional materials. Simulations are in reasonable agreements with the experimental results in the entire frequency range, and the polarization conversion ratio is over 90% for both linear and circular polarizations in simulation. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:978-983, 2015
摘要：
Metamaterials (MMs) can be tailored to support electromagnetic interference, which is the kernel for the material-based electromagnetically induced transparency (EIT) phenomena, alternatively transparency based on electric interference can be deemed as electrically resonant transparency (ERT). Here, we experimentally and theoretically demonstrate two kinds of bi-layered MMs. The C3-C6 hybrid MM exhibits triple-mode ERT with transmission peaks of 0.84 at 9.6 GHz, 0.92 at 10.4 GHz, and 0.93 at 11.5 GHz for the horizontally polarized wave, and dual-mode ERT with transmission peaks of 0.84 at 8.8 GHz and 0.91 at 10.2 GHz for the vertically polarized wave. However, the C4-C8 hybrid MM, with two stable transparent peaks of 0.92 and 0.88 at 10.46 GHz and 11.61 GHz, is proven to be polarization independent. The measured results show excellent agreement with numerical simulations. A coupled oscillator model is employed to theoretically study the near field interference between the induced dipoles on the transmission properties. The results presented here will find their application value for multi-mode slow light devices, filters and attenuators, and so on.
摘要：
A multiple-band metamaterial reflective polarization converter (RPC) is proposed, which is composed of the dielectric substrate sandwiched with U-shaped metallic patterns and continuous metal film. The proposed U-shaped metamaterial RPC (UMM-RPC) can convert a linearly polarized wave to its cross polarized wave at the three resonant frequencies, which also can convert the linearly polarized wave to circularly polarized wave at other three resonant frequencies. Furthermore, the proposed UMM-RPC can maintain the same conversional direction at the three resonant frequencies when incident on a circularly polarized wave. The simulated and measured results are in agreement in the entire frequency range, and the polarization conversion ratio is over 90% for both linear and circular polarizations. The surface current distributions of the UMM-RPC are discussed to look into the physical mechanism. The proposed UMM-RPC has simple geometry but more operating frequency bands compared to the previous designs and can be used in applications such as antenna radome, remote sensors, and radiometer.
