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We developed a combined BIM-DTA (the Born iterative method with the diagonal tensor approximation) and DBIM-BCGS (the distorted Born iterative method with the stabilized biconjugate gradient fast Fourier transform) method for 3D image reconstruction in layered media. The DTA is a high-order scattering approximation method that does not require a large matrix inversion in the forward solver. So the...
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The aim of this paper is the study of some asymptotic properties and invariances of the electric field integral equation (EFIE) when applied to large and smooth structures. It is theoretical in nature, and thus no numerical results are included in this communication.
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An internal PIFA/slot antenna for quad-band mobile handset applications is presented. The quad-band operation for the bar-type mobile handset is obtained by the resonant modes of the slot antenna in conjunction with those of the PIFA. The proposed antenna has a compact size of 42 times 10 times 4 mm3. The quad-band operation includes GSM850 (824-894 MHz), GSM900 (880-960 MHz), DCS1800 (1710-1880 MHz),...
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The physical optics (PO) approximation is a well-known technique used to analyze very large conducting structures. In scattering problems and radiation of large reflectors, the PO technique provides acceptable accuracy for some applications. This technique allows avoiding the hard solution of the Method of Moment (MoM) linear system by approximating this solution by the explicit PO current.
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The basic approach of transformation electromagnetics, in which coordinate transformations on electromagnetic fields can be physically realized with complex materials, has been applied to yield a wide range of electromagnetic devices that until now would have been almost inconceivable. Only recently has the transformation electromagnetics concept been extended to include sources. In the authors analyze...
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A metafilm (also referred to as a metasurface) is the surface equivalent of a metamaterial. More precisely, a metafilm is a surface distribution of suitably chosen electrically small scatterers. Metafilms are becoming popular as an alternative to full three-dimensional metamaterials. Unfortunately, many papers in the literature present incorrect interpretations and mischaracterizations of these metafilms...
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A high resolution interpolation scheme for use with the FDTD method at ELF frequencies under water is described. Since the interpolation is applied after the FDTD Simulation, it adds very little to the computation time or resources.
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In this paper, a novel ldquogreenrdquo inkjet-printed monopole antenna topology for integrated RFID-reader and cellular communication functionalities is presented. The antenna is loaded with a parasitic strip to fulfil the design requirements for the required dual-band operation. The design characteristics of the antenna are verified for paper-based substrates through extensive simulated parametric...
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In this paper, the integration of a flexible RFID tag with an inkjet-printed Single Walled Carbon Nanotube (SWCNT) film in a chipless sensor node for toxic gas detection was introduced for the first time. The whole module is realized on a "green" low-cost paper substrate. Carbon nanotube composites change their electric properties (e.g. resistance, dielectric properties) in the presence...
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The efficient calculation of the electromagnetic interactions with dielectric objects is always a challenge to CEM (computational electromagnetics). Among the numerical exact methods, the method of moment (MoM) is considered to be more preferable than finite element method (FEM) and finite difference method (FDTD) for its high precision and discretization on the geometry model instead of the field...
