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An inverse iterative algorithm for microwave imaging based on moment method solution is presented here. This algorithm is based on Levenberg - Merquardt regularization technique with multiple illuminations of the target. It produces better reconstructed image of numerical model under noisy condition in comparison to that developed by our previous algorithms.
The Ca5-xMgxNb4TiO17 (x = 0-3) ceramics were prepared by conventional solid state ceramic route. The microstructure of the ceramic was studied using scanning electron spectroscopy. The microwave dielectric properties (Quxf, epsivr and tauf) were measured using a vector network analyser. Ca5Nb4TiO17 ceramics have a relative permittivity(epsivr) of 45, quality factor (Quxf) of 17600 GHz (at 4.13 GHz),...
The phase pure dielectric ceramic with composition 0.95MgTiO3-0.05CaTiO3 (MCT) were prepared using solid state ceramic route and the effect of 60-ZnO30-B2O310-SiO2 (ZBS) on the sinterability, microstructure and dielectric properties were studied. The structural characterization using X-ray diffraction (XRD), microstructure analysis, was carried out using SEM microstructure EDAX and the microwave dielectric...
The Ca[(Li1/3Nb2/3)1-xTix]O3-delta (x=0.2 and 0.25) (CLNT) ceramics with Lithium Magnesium Zinc Borosilicate (LMZBS) glasses were prepared by conventional solid state ceramic route. The crystal structure and microstructure of the glass added and sintered CLNT ceramics were studied using X-ray diffractometer and Scanning electron microscope. The addition of LMZBS glasses improved the densification...
The paper presents a rigorous analysis of a uniform waveguide with circular outer conductor and eccentric inner conductor supported by dielectric slab between the inner and outer conductors. A vector finite element approach in which non-physical spurious solutions do not appear has been followed to study the cut-off frequencies of higher-order modes as well as dispersion characteristics of this guiding...
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