Browsing by Keywords "Metamaterials"
Now showing items 21-40 of 104
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Design of miniaturized narrowband absorbers based on resonant-magnetic inclusions
(IEEE, 2011-06-21)In this paper, we present the design of miniaturized narrowband-microwave absorbers based on different kinds of magnetic inclusions. The operation of the proposed components originates from the resonance of a planar array ... -
Design of novel printed microwave band-reject filters using split-ring resonator and complementary split-ring resonator
(Bilkent University, 2008)Filters are one of the fundamental microwave components used to prevent the transmission or emission of signals with unwanted frequency components. In general, they can be considered as an interconnection of resonator ... -
Designing materials with desired electromagnetic properties
(Wiley, 2006)In this work, we suggest and demonstrate a robust method to tune the plasma frequencies of wire mediums. The method we suggest involves the use of two or more wire arrangements in the unit cell. By incorporating the method ... -
Determining the effective constitutive parameters of finite periodic structures: Photonic crystals and metamaterials
(Institute of Electrical and Electronics Engineers, 2008)A novel approach to find the effective electric and magnetic parameters of finite periodic structures is proposed. The method uses the reflection coefficients at the interface between a homogenous half-space and the periodic ... -
Development of left-handed composite materials and negative refracting photonic crystals with subwavelength focusing
(SPIE, 2005)We review the studies conducted in our group concerning electromagnetic properties of metamaterials and photonic crystals with negative effective index of refraction. In particular, we demonstate the true left handed ... -
Development of micro-structured metamaterials for innovative antenna layouts
(IEEE, 2007)In this paper, we present the joint activities developed in the frame of the FP6 European Network of Excellence METAMORPHOSE in the field of new micro-structured materials for antenna applications. One of the key scientific ... -
Disordered nanohole patterns in metal-insulator multilayer for ultra-broadband light absorption: atomic layer deposition for lithography free highly repeatable large scale multilayer growth
(Nature Publishing Group, 2017)In this paper, we demonstrate a facile, lithography free, and large scale compatible fabrication route to synthesize an ultra-broadband wide angle perfect absorber based on metal-insulator-metal-insulator (MIMI) stack ... -
Efficient solutions of metamaterial problems using a low-frequency multilevel fast multipole algorithm
(2010)We present fast and accurate solutions of electromagnetics problems involving realistic metamaterial structures using a lowfrequency multilevel fast multipole algorithm (LF-MLFMA). Accelerating iterative solutions using ... -
Efficient surface integral equation methods for the analysis of complex metamaterial structures
(IEEE, 2009)Two approaches, the multilevel fast multipole algorithm with sparse approximate inverse preconditioner and the surface equivalence principle algorithm, are applied to analyze complex three-dimensional metamaterial structures. ... -
Electromagnetic modeling of split-ring resonators
(IEEE, 2007)In this paper, we report our efforts to model splitring resonators (SRRs) and their large arrays accurately and efficiently in a sophisticated simulation environment based on recent advances in the computational electromagnetics. ... -
Enhanced transmission of electromagnetic waves through split-ring resonator-shaped apertures
(Society of Photo-Optical Instrumentation Engineers (SPIE), 2011-06-21)The design of aperture shape is a promising approach for enhanced transmission through a subwavelength aperture. We designed split-ring-resonator (SRR)-shaped apertures in order to increase the transmission through ... -
Enhanced transmission through a sub-wavelength aperture: resonant approaches employing metamaterials
(Institute of Physics Publishing Ltd., 2009-09-17)In this paper, we propose a number of resonant metamaterial-based approaches to enhance the power transmission through sub-wavelength apertures. The extraordinary transmission beyond the diffraction limit is usually obtained ... -
Equivalent-circuit models for the design of metamaterials based on artificial magnetic inclusions
(Institute of Electrical and Electronics Engineers, 2007)In this paper, we derive quasi-static equivalent-circuit models for the analysis and design of different types of artificial magnetic resonators-i.e., the multiple split-ring resonator, spiral resonator, and labyrinth ... -
Experimental demonstration of negative refraction and subwavelength imaging by left-handed composite metamaterials
(Cambridge University Press, 2006)We report a true left-handed (LH) behavior and focusing in a composite metamaterial consisting of periodically arranged split ring resonator (SRR) and wire structures. The magnetic resonance of the SRR structure is ... -
Experimental demonstration of the enhanced transmission through circular and rectangular sub-wavelength apertures using omega-like split-ring resonators
(Elsevier, 2013-02)Enhanced transmission through circular and rectangular sub-wavelength apertures using omega-shaped split-ring resonator is numerically and experimentally demonstrated at microwave frequencies. We report a more than ... -
Experimental study of subwavelength focusing by lefthanded metamaterials with a negative refractive index
(2007)Two dimensional (2D) left-handed metamaterials (LHM) exhibiting negative refraction and subwavelength imaging are studied experimentally. A left-handed transmission band is observed at the frequencies where both dielectric ... -
Experimental verification of metamaterial based subwavelength microwave absorbers
(American Institute of Physics, 2010-10-29)We designed, implemented, and experimentally characterized electrically thin microwave absorbers by using the metamaterial concept. The absorbers consist of (i) a metal back plate and an artificial magnetic material layer; ... -
Experimental verification of metamaterial loaded small patch antennas
(Emerald Group Publishing Limited, 2013)Purpose - Metamaterial unit cells composed of deep subwavelength resonators brought up new aspects to the antenna miniaturization problem. The paper experimentally demonstrates a metamaterial-inspired miniaturization method ... -
Extracting power from sub-wavelength apertures by using electrically small resonators: Phenomenology, modeling, and applications
(IEEE, 2012)In this contribution, we review our recent work on the extraction of the electromagnetic power from electrically small apertures by using metamaterial-inspired resonators. First, we present an antenna interpretation of the ... -
Fast and accurate analysis of complicated metamaterial structures using a low-frequency multilevel fast multipole algorithm
(2009-09)We present efficient solutions of electromagnetics problems involving realistic metamaterial structures using a low-frequency multilevel fast multipole algorithm (LF-MLFMA). Ordinary implementations of MLFMA based on the ...
