Editorial The Applications of Metamaterialsdownloads.hindawi.com/journals/ijap/2015/729617.pdf ·...
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Editorial The Applications of Metamaterials Hui Feng Ma, 1 Sanming Hu, 2,3 Yun Gui Ma, 4 Yun Lai, 5 and Karu Esselle 6 1 State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China 2 School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK 3 Institute of Microwave Techniques, University of Ulm, 89069 Ulm, Germany 4 State Key Lab of Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University, Hangzhou 310058, China 5 School of Physical Science and Technology, Soochow University, Suzhou 215006, China 6 Department of Engineering, Macquarie University, Sydney, NSW 2109, Australia Correspondence should be addressed to Hui Feng Ma; [email protected] Received 2 April 2015; Accepted 2 April 2015 Copyright © 2015 Hui Feng Ma et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Metamaterials are artificial structures composed of periodic or nonperiodic subwavelength macro cells. e advantages of metamaterials are that their effective medium properties can be controlled by designing the macro units to constitute special materials that do not exist in nature. Metamaterial is a research area with importantly theoretical significance and challenges, which has achieved significant breakthroughs in theory. However, the lack of applications is a bottleneck to restrict the further development of metamaterial. Hence it is very important to develop and seek the significant applications in this area. e papers selected for this special issue present some potential applications of metamaterial, and we are pleased to share them with the readers. e special issue contains seven papers, where two papers are related to control of radiation patterns by using meta- surface. One paper presents a modified two-dimensional Luneburg lens based on bulky metamaterials. One paper introduces an improved artificial transmission line with low characteristic impedance to minimize the Balun. One paper provides a method to design the temperature sensor by using metamaterial. e other two papers propose the combination of the metamaterial structures with traditional microstrip antennas to achieve performance improvement. In a paper entitled “Suppression of Specular Reflections by Metasurface with Engineered Nonuniform Distribution of Reflection Phase,” X. M. Yang et al. study a novel planar metasurface characterizing nonuniform distribution of reflection phase. A design example of the metasurface is presented. In the example, three-layer stacked square patches with variable sizes are utilized as the reflecting elements of the metasurface. It is verified by both theoretical calculation and numerical simulation that the metasurface is capable of suppressing specular reflections of conducting plates significantly for two orthogonal incident polarizations by scattering most incident energy in off-specular directions. e proposed metasurface is an effective approach of RCS- reduction for conducting objects and has the potential of providing broadband performance. In the paper entitled “Control of the Radiation Patterns Using Homogeneous and Isotropic Impedance Metasurface,” F. Yang et al. use a cylindrical metasurface to conduct an antenna system. ey point out that the radiation patterns of this antenna can be manipulated by altering the surface impedance of this metasurface. Also, they give theoreti- cal derivations, together with some numerical simulation, to demonstrate the validity of this antenna system. e proposed surface has many good properties, like isotropy, homogeneity, low profile, and high selectivity of frequency. In the paper entitled “Modified Luneburg Lens Based on Metamaterials,” H. Chen et al. present a modified two- dimensional Luneburg lens composed of a number of con- centric layers, and the varied I-shaped units are used in the Hindawi Publishing Corporation International Journal of Antennas and Propagation Volume 2015, Article ID 729617, 2 pages http://dx.doi.org/10.1155/2015/729617
Transcript of Editorial The Applications of Metamaterialsdownloads.hindawi.com/journals/ijap/2015/729617.pdf ·...
EditorialThe Applications of Metamaterials
Hui Feng Ma,1 Sanming Hu,2,3 Yun Gui Ma,4 Yun Lai,5 and Karu Esselle6
1State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China2School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK3Institute of Microwave Techniques, University of Ulm, 89069 Ulm, Germany4State Key Lab of Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research,Department of Optical Engineering, Zhejiang University, Hangzhou 310058, China5School of Physical Science and Technology, Soochow University, Suzhou 215006, China6Department of Engineering, Macquarie University, Sydney, NSW 2109, Australia
Correspondence should be addressed to Hui Feng Ma; [email protected]
Received 2 April 2015; Accepted 2 April 2015
Copyright © 2015 Hui Feng Ma et al. This is an open access article distributed under the Creative Commons Attribution License,which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Metamaterials are artificial structures composed of periodicor nonperiodic subwavelength macro cells. The advantagesof metamaterials are that their effective medium propertiescan be controlled by designing the macro units to constitutespecial materials that do not exist in nature. Metamaterialis a research area with importantly theoretical significanceand challenges, which has achieved significant breakthroughsin theory. However, the lack of applications is a bottleneckto restrict the further development of metamaterial. Henceit is very important to develop and seek the significantapplications in this area. The papers selected for this specialissue present some potential applications of metamaterial,and we are pleased to share them with the readers.
The special issue contains seven papers, where two papersare related to control of radiation patterns by using meta-surface. One paper presents a modified two-dimensionalLuneburg lens based on bulky metamaterials. One paperintroduces an improved artificial transmission line with lowcharacteristic impedance to minimize the Balun. One paperprovides a method to design the temperature sensor by usingmetamaterial.The other two papers propose the combinationof the metamaterial structures with traditional microstripantennas to achieve performance improvement.
In a paper entitled “Suppression of Specular Reflectionsby Metasurface with Engineered Nonuniform Distributionof Reflection Phase,” X. M. Yang et al. study a novel
planar metasurface characterizing nonuniform distributionof reflection phase. A design example of the metasurfaceis presented. In the example, three-layer stacked squarepatches with variable sizes are utilized as the reflectingelements of the metasurface. It is verified by both theoreticalcalculation and numerical simulation that the metasurfaceis capable of suppressing specular reflections of conductingplates significantly for two orthogonal incident polarizationsby scattering most incident energy in off-specular directions.The proposed metasurface is an effective approach of RCS-reduction for conducting objects and has the potential ofproviding broadband performance.
In the paper entitled “Control of the Radiation PatternsUsing Homogeneous and Isotropic Impedance Metasurface,”F. Yang et al. use a cylindrical metasurface to conduct anantenna system. They point out that the radiation patternsof this antenna can be manipulated by altering the surfaceimpedance of this metasurface. Also, they give theoreti-cal derivations, together with some numerical simulation,to demonstrate the validity of this antenna system. Theproposed surface has many good properties, like isotropy,homogeneity, low profile, and high selectivity of frequency.
In the paper entitled “Modified Luneburg Lens Basedon Metamaterials,” H. Chen et al. present a modified two-dimensional Luneburg lens composed of a number of con-centric layers, and the varied I-shaped units are used in the
Hindawi Publishing CorporationInternational Journal of Antennas and PropagationVolume 2015, Article ID 729617, 2 pageshttp://dx.doi.org/10.1155/2015/729617
2 International Journal of Antennas and Propagation
design. Both simulation and experiment results prove the factthat cylindrical waves can be transformed into plane waveswhen penetrating through the modified Luneburg lens.
In the paper entitled “Compact Two-Section Half-WaveBalun Based on Planar Artificial Transmission Lines,” C. Liuet al. present and analyse an improved artificial transmissionline with low characteristic impedance. Then, using sevensections of this transmission line, a compact 900MHz Balunis designed, fabricated, and experimentally verified to achievea significant size reduction of around 90%.
In a paper entitled “Design of a Compact and High Sen-sitivity Temperature Sensor Using Metamaterial,” S. Zemouliet al. present a sensor of temperature using the metamaterialwhich is composed of split resonant rings (SRRs) and a cutwire deposed on the surface of BaTiO
3substrate.The permit-
tivity of BaTiO3has big dependence with the temperature,
which can affect the resonant frequency of the SRRs andcut wire; hence the resonant peak of the structures will besensitive to the temperature.
In the paper entitled “Metamaterial Inspired MicrostripAntenna Investigations Using Metascreens,” M. T. Asim andM. Ahmed introduce a metascreen and apply it under theproposed metamaterial antenna and over a simple patchantenna to investigate their performances. The −10 dB band-widths are 14.56% and 22.86% for the metamaterial antennawith single and double metascreens which are observedfrom measured results, respectively. Similarly, the −10 dBbandwidth for the simple patch with inverted metascreen isalso measured as 9.6% and 16.66% for dual band operation.Hence, the proposed technique has potential applications inUWB wireless.
In a paper entitled “Comparison Analysis of Single LoopResonator BasedMiniaturized Triple-Band PlanarMonopoleAntennas,” K. Wu et al. present four kinds of metamaterialminiaturized triple-band antennas by integrating a singleloop resonator (SLR) as part of the radiation patch. Twokinds of SLRs (rectangular and circular shaped radiationpatches) are investigated and discussed, which can providethe additional operating frequencies of miniaturized pla-nar monopole antennas. Two feeding techniques includingcoplanar waveguide and microstrip feeds are also presented,respectively. The numerical and experimental results showgood performances of the miniaturized triple-band antennasconsisting of a SLR, which have potential applications forwireless communications.
Acknowledgments
We would like to thank the authors for their excellent contri-butions and patience in assisting us. Finally, the fundamentalwork of all the reviewers of these papers is also very warmlyacknowledged.
Hui Feng MaSanming HuYun Gui Ma
Yun LaiKaru Esselle
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