Browsing by Keywords "Permittivity"
Now showing items 1-20 of 31
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Analysis of finite arrays of circumferentially oriented printed dipoles on electrically large cylinders
(Wiley, 2004)An efficient and accurate hybrid method of moments (MoM)/Green's function technique in the spatial domain is developed for the rigorous analysis of large, finite phased arrays of circumferentially oriented printed dipoles ... -
Convection-reaction equation based magnetic resonance electrical properties tomography (cr-MREPT)
(Institute of Electrical and Electronics Engineers Inc., 2014)Images of electrical conductivity and permittivity of tissues may be used for diagnostic purposes as well as for estimating local specific absorption rate distributions. Magnetic resonance electrical properties tomography ... -
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 ... -
Effect of disorder on magnetic resonance band gap of split-ring resonator structures
(Optical Society of American (OSA), 2004)We investigated the influence of periodicity, misalignment, and disorder on the magnetic resonance gap of split-ring resonators (SRRs) which are essential components of left handed-metamaterials (LHMs). The resonance of a ... -
Effective mass enhancement in two-dimensional electron systems: The role of interaction and disorder effects
(Elsevier, 2004)Recent experiments on two-dimensional (2D) electron systems have found a sharp increase in the effective mass of electrons with decreasing electron density. In an effort to understand this behavior we employ the many-body ... -
Efficient analysis of large phased arrays using iterative MoM with DFT-based acceleration algorithm
(John Wiley & Sons, Inc., 2003)A discrete Fourier transform (DFT)-based iterative method of moments (IMoM) algorithm is developed to provide an O(Ntot) computational complexity and memory storages for the efficient analysis of electromagnetic ... -
Electrostatic energy barriers from dielectric membranes upon approach of translocating DNA molecules
(A I P Publishing LLC, 2016)We probe the electrostatic cost associated with the approach phase of DNA translocation events. Within an analytical theory at the Debye-Hückel level, we calculate the electrostatic energy of a rigid DNA molecule interacting ... -
Experimental demonstration of labyrinth-based left-handed metamaterials
(Optical Society of America, 2005-12-12)In this present work, we propose and demonstrate a resonant structure that solves two major problems related to the split-ring resonator structure. One of the problems related to the split-ring resonator structure is the ... -
Frequency responses of ground-penetrating radars operating over highly lossy grounds
(IEEE, 2002)The finite-difference time-domain (FDTD) method is used to investigate the effects of highly lossy grounds and the frequency-band selection on ground-penetrating-radar (GPR) signals. The ground is modeled as a heterogeneous ... -
Highly directional enhanced radiation from sources embedded inside two and three-dimensional photonic crystals
(2005)In this work, we have experimentally and theoretically studied the emission of radiation from a monopole source embedded in a two and three dimensional photonic crystal. We have demonstrated the enhancement of radiation ... -
Highly directive radiation and negative refraction using photonic crystals
(Institute of Physics Publishing, 2005)In this article, we present an experimental and numerical study of certain optical properties of two-dimensional dielectric photonic crystals (PCs). By modifying the band structure of a two-dimensional photonic crystal ... -
The magical world of metamaterials
(2009)In recent years, there has been a burgeoning interest in rapidly growing field of metamaterials due to their unprecedented properties unattainable from ordinary materials. Veselago pointed out that a material exhibiting ... -
Metamaterial based cloaking with sparse distribution of spiral resonators
(2010)We investigate the application of a metamaterial that is formed by the sparse distribution of spiral resonators as an optical transformation medium is in order to achieve electromagnetic cloaking. The well-known Clausius-Mossotti ... -
Microwave transmission through metamaterials in free space
(2002)To investigate properties of metamaterials, composite structures which consists of periodical arrangement of thin copper wires and SRRs on a circuit board was constructed. Through this, the transmission properties of ... -
Negative refraction and subwavelength focusing using left-handed composite metamaterials
(2008)We review experimental studies performed on left-handed metamaterials (LHM) at microwave frequencies. The metamaterial structure is composed of periodic arrays of split-ring resonators and wire meshes and exhibits a ... -
Negative refraction and subwavelength focusing using photonic crystals
(2005)We review certain novel optical properties of two-dimensional dielectric photonic crystals (PCs) which exhibit negative refraction behavior. We investigate two mechanisms which utilize the band structure of the PC and lead ... -
Negative refraction through an impedance-matched left-handed metamaterial slab
(Optical Society of American (OSA), 2006)We report the transmission and reflection characteristics of a two-dimensional (2D) left-handed metamaterial (LHM). A well-defined left-handed (LH) transmission band with a peak value of -9.9 dB is obtained at frequencies ... -
Novel high-K inverse silver oxide phases of SiO2, GeO2, SnO2, and their alloys
(Elsevier, 2006)The recently reported inverse silver oxide phase of SiO2 possesses a high dielectric constant as well as lattice constant compatibility to Si. We explore the closely related oxides, GeO2, SnO2 with the same inverse silver ... -
Observation of negative refraction and negative phase velocity in left-handed metamaterials
(American Institute of Physics, 2005)We report the transmission characteristics of a two-dimensional (2D) composite metamaterial (CMM) structure in free space. At the frequencies where left-handed transmission takes place, we experimentally confirmed that the ... -
On the frequency-band selection for ground-penetrating radars operating over lossy and heterogeneous grounds
(2001)The frequency-band selection for ground penetrating radars operating over lossy and heterogenous grounds was discussed. The simulations were carried out using perfectly matched layer (PML) absorbing boundary conditions ...
