Showing papers by "Qaisar Abbas Naqvi published in 2010"
TL;DR: In this article, the authors derived field expressions for three-layered fractional dual planar waveguides by virtue of fractional curl operator and showed that, for 0 < α < 1, neither electric field and nor magnetic field is zero inside chiral nihility layers of the waveguide.
Abstract: Field expressions for guided waves in three-layered fractional dual planar waveguides are derived by virtue of fractional curl operator Fractional dual waveguides may be regarded as intermediate steps of the two waveguides which are related through principle of duality All layers are parallel to the walls of the guide Middle layer of the waveguide is filled with air however other two layers are filled with chiral nihility metamaterial Parameter α describes the order of the fractional curl operator No electric field exists in the chiral nihility layers of the waveguide for α = 0, whereas no magnetic field exists in the chiral nihility layers for α = 1 That is, power flow is confined to only air region of the waveguide for integer values of fractional parameter and corresponding situations have been previously discussed in a published work In present work, it is noted that, for 0 < α < 1, neither electric field and nor magnetic field is zero inside chiral nihility layers of the fractional dual wavegu
44 citations
TL;DR: In this paper, a chiral-coated nihility cylinder with a uniform thickness was used to scatter electromagnetic plane waves from an inflnitely long nhility cylinder.
Abstract: Scattering of electromagnetic plane waves from an inflnitely long nihility cylinder, coated with a chiral layer of uniform thickness, is presented. Cylindrical vector wave functions have been used to express the flelds in difierent regions. The solution is determined by solving the wave equation for difierent regions and applying the appropriate boundary conditions at the discontinuities. Both TM and TE polarizations as incident plane wave have been considered in the analysis. Obtained Numerical results for the chiral-coated nihility cylinder are compared with a chiral-coated PEC cylinder.
41 citations
TL;DR: In this article, the reflection of a plane wave from a perfect electromagnetic conductor (PEMC) and fractional dual interface placed in a chiral nihility medium is determined.
Abstract: The reflection of plane wave from a perfect electromagnetic conductor (PEMC) and fractional dual interface placed in a chiral nihility medium is determined. It is noted that for both the cases reflected field is a backward wave. Electric and magnetic fields associated with the reflected wave do not cancel the corresponding electric and magnetic fields associated with the incident wave. It is also noted that in each case time average of the total power yields zero result, that is, the time average of the power incident on the interface cancels the time average of the reflected power. Chiral nihility waveguides, in which power may be confined to certain regions of the waveguide, are proposed.
35 citations
TL;DR: An analytical solution for the scattering of an electromagnetic plane wave from a coated perfect electromagnetic conducting (PEMC) circular cylinder, buried in the dielectric half space, is presented in this article.
15 citations
TL;DR: In this paper, the diffracting behavior of a perfectly electromagnetic conductor (PEMC) strip has been studied using Kobayashi potential (KP) analysis.
Abstract: In this paper, diffracting behavior of a perfectly electrom agnetic conductor (PEMC) strip has been studied. Both the E- and H-polarization are considered. The method of analysis is Kobayashi Potential (KP). Imposition of boundary conditions results into dual integral equations (DIEs). These DIEs are solved by using the discontinuous properties of Weber-Schafheitlin's integral. The resulting expressions, finally, reduce to mat rix equations with infinite number of unknowns whose element s are expressed in terms of infinite integrals. These integrals ar e hard to solve analytically so numerical simulation is done. Illustrative computations are presented for different parameters of interest especially the dependence of co-polarized and cross-polarized components on the admittance parameter.
12 citations
TL;DR: In this paper, the transmission coefficient and diffraction pattern of a PEC wide double wedge in the presence of both coated and uncoated PEMC cylinder were studied, and the results were in fairly good agreement.
Abstract: Scattering of electromagnetic plane waves from a coated perfect electromagnetic conductor � PEMCcircular cylinder placed under perfect electric conductingPECwide double wedge is presented. It is assumed that the distance between the two wedges is large as compared to the wavelength. Therefore, the field at an observation point can be considered to be composed of the incident field plus a response field from each of the edges of double wedge and the cylinder. PEMC cylinder is taken to be infinite along its axis and has been coated with a double positiveDPSor double negativeDNGmaterial. The transmission coefficient and diffraction pattern of PEC wide double wedge in the presence of both coated and uncoated PEMC cylinder are studied. Results of special cases for PEMC cylinder, compared with the published work, are found to be in fairly good agreement. The techniques of Clemmow, and Karp and Russek have been used to investigate the transmission coefficient and diffraction pattern of the double wedge in the presence of both coated and un-coated PEMC circular cylinder.
2 citations
TL;DR: In this paper, the authors derived integral representations suitable for studying the focusing of electromagnetic waves through a symmetrically hyperbolic focusing lens into uniaxial crystal in the presence of cylindrical and coma aberrations using Maslov's method.
Abstract: We derive integral representations suitable for studying the focusing of electromagnetic waves through a symmetrically hyperbolic focusing lens into uniaxial crystal in the presence of cylindrical and coma aberrations using Maslov's method. The uniaxial crystal used is the negative crystal LiNbO3. Numerical computations are made to obtain the results for focused flelds inside negative uniaxial crystal with several difierent orientations of the optical axis in the plane of incidence. The efiects of aberrations inside uniaxial crystal and isotropic medium are also noted. The results are compared with those obtained by Kirchhofi-Huygens integral and Maslov's method which are in good agreement.
2 citations
TL;DR: In this article, the analytical solution of electromagnetic fields and dispersion relations is carried out using the fractional curl operator, and the numerical results are given by assuming that wave numbers k and k ± are either real or imaginary.
2 citations