CMC-Vol. 52, No. 3, 2016

Open Access

ARTICLE

Analysis of Metamaterial Cloaks Using Circular Split Ring Resonator Structures
Susan Thomas¹, Dr. Balamati Choudhury²
CMC-Computers, Materials & Continua, Vol.52, No.3, pp. 133-141, 2016, DOI:10.3970/cmc.2016.052.132
Abstract A novel microwave cloak using circular split ring resonator (SRR) based metamaterial structure has been proposed in this paper. The cloak which operates at a frequency of 10.6 GHz is composed of cylindrical dielectric sheets printed with circular split ring resonators of spatially varying and anisotropic material properties. The article also focuses on the phenomenon of resonant splitting in circular SRR microwave cloak. A detailed analysis of various linear metamaterial arrays and their response has also been elucidated. More >

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ARTICLE

Metamaterial Inspired Radar Absorbers: Emergence, Trends and Challenges
Anusha Eldo¹, Balamati Choudhury²
CMC-Computers, Materials & Continua, Vol.52, No.3, pp. 143-157, 2016, DOI:10.3970/cmc.2016.052.142
Abstract The advances in metamaterial science and technology have raised the expectations of camouflage or stealth researchers to one order higher in terms of absorption characteristics. As metamaterial inspired radar absorbing structures are proving themselves as a good candidate with near unity absorption, feasibility towards hardware realization is necessary. Hence an extensive literature survey of metamaterial inspired radar absorbing structure has been carried out and reported in this paper along with the challenges and material issues. The various types of metamaterial structures that can be used as absorber have been provided along with simulation figures. To More >

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Automated Synthesis of Wideband Bandpass Filters Based on Slow-wave EBG Structures
Marco Orellana¹, Jordi Selga¹, Paris Vélez¹, Marc Sans¹, Ana Rodríguez², Vicente Boria², Ferran Martín¹
CMC-Computers, Materials & Continua, Vol.52, No.3, pp. 159-174, 2016, DOI:10.3970/cmc.2016.052.157
Abstract This paper is focused on the automated synthesis of wideband bandpass filters operating at microwave frequencies and based on electromagnetic bandgap (EBG) structures. The classical counterpart of such filter consists of a combination of transmission line sections and shunt-connected grounded stubs placed at equidistant positions. By replacing the transmission line sections with capacitively-loaded lines (a kind of EBG-based lines) exhibiting the same phase shift at the lower cutoff frequency and the same characteristic (actually Bloch) impedance, filter size is reduced and the spurious pass bands can be efficiently suppressed. In practice, the loading capacitances are… More >

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ARTICLE

Structural and Optical Properties of Graphene Oxide Prepared by Modified Hummers’ Method
N. Selvakumar^1,2, Uday Pradhan¹, S.B. Krupanidhi², Harish C. Barshilia^1,*
CMC-Computers, Materials & Continua, Vol.52, No.3, pp. 175-185, 2016, DOI:10.3970/cmc.2016.052.173
Abstract Graphene oxide was synthesized from graphite flakes using modified Hummers’ method. The interlayer spacings of graphite, graphite oxide and graphene oxide were measured using X-ray diffraction technique. The C/O atomic ratios of graphite oxide and graphene oxide were calculated from XPS measurements. The transformation of graphite to graphite oxide and finally to graphene oxide was clearly observed from the micro-Raman spectroscopy data and was confirmed from the FESEM micrographs. UV-VIS-NIR spectrophotometer was used to study the absorbance of graphene oxide and reduced graphene oxide samples. Finally, the chemically reduced graphene oxide was heat-treated in air More >

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ARTICLE

High Security Identity Tags Using Spiral Resonators
Anju Pradeep¹, S. Mridula¹, P. Mohanan²
CMC-Computers, Materials & Continua, Vol.52, No.3, pp. 187-196, 2016, DOI:10.3970/cmc.2016.052.185
Abstract A highly compact chipless tag based on Frequency coding technique using Spiral Resonators is proposed in this paper. Spirals are well known metamaterial structures and thus capable of sharp resonance, and hence Spiral Resonators can serve as a good candidate for RF Identity Tags. The bit capacity of the proposed tag is 10 bits per sqcm. The prototype of the tag is fabricated on a low-cost substrate of dielectric constant 4.4 and loss tangent 0.02. The overall dimension of tag is 15.4 x 3 x 1.6 mm³. Two methods for reading the tags are also discussed More >

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ARTICLE

Analytical Estimation of Radar Cross Section of Infinitely Long Conducting Cylinder Coated with Metamaterial
Girish K.¹, Hema Singh²
CMC-Computers, Materials & Continua, Vol.52, No.3, pp. 197-212, 2016, DOI:10.3970/cmc.2016.052.196
Abstract Aerospace structures can be approximately modeled as a combination of canonical structures such as cylinder, cone and ellipsoid. Thus the RCS estimation of such canonical structures is of prime interest. Furthermore metamaterials possess peculiar electromagnetic properties which can be useful in modifying the RCS of structures. This paper is aimed at calculating the RCS of an infinitely long PEC circular cylinder coated with one or two layers of metamaterial. The incident and scattered fields of coated cylinder are expressed in terms of series summation of Bessel and Hankel functions. The unknown coefficients of summation are More >

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