1,721,122 research outputs found
Generalizzazione del metodo delle linee per strutture stratificate realizzate su substrati non convenzionali, in collaborazione con il Dr. Fabio Urbani
No full textElectromagnetic Field Computation in Planar Integrated Structures with a Biisotropic Chiral Grounded Slab
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Electromagnetic field computation in planar integrated structures with a biisotropic chiral grounded slab
No full textA method, based on the Full Wave Analysis (FWA) is presented to treat analytically and evaluate numerically the electromagnetic field sustained by an electric point-source inside an electrically biisotropic chiral grounded slab embedded in an isotropic homogenous half-space in presence of a perfectly conducting finite patch located at the interface. The expression of the electric field in each region of the space in terms of the spectral electric Green's dyad is given. The use of the boundary conditions allows us to determine a Integral Equation (SEIE) for the density induced on the scatterer's surface. The solution of the SEIE is carried out in the general case of location of the electric sources with the patch parallel to the Interface. Numerical results for the input impedance of the structure and the radiated far-field with noteworthy information about the radiation on the horizon plane and constraints on the electromagnetic parameters, thickness of the slab, working frequency and source position are presented and discussed
Synthesis of Patch Antennas Loaded by Inhomogeneous Substrates via a Combined Spectral Domain-Genetic Algorithm Approach
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Relationships between the geographic distribution of phytophagous insects and different types of vegetation: A case study of the flea beetle genus Chaetocnema (Coleoptera: Chrysomelidae) in the Afrotropical region
Full text linkBiodiversity and biogeography in Madagascar: revision of the endemic flea beetle genus Neodera Duvivier, 1891 with description of 19 new species (Coleoptera, Chrysomelidae, Galerucinae, Alticini)
No full textInhomogeneous layered planar structures: an analysis of reflection coefficient
No full textIn this paper we find the solution of telegrapher's equations for a non-homogeneous medium applying the theory of hypergeometric functions. Also we show that such a medium is described by means of a stratified structure, so we can use the developed theory for microwave components. We find the behavior of the reflection coefficient and compare it with other known results present in literature. Moreover, we show how an Exponentially Tapered Non Uniform Transmission Line (ETNUTL) can be treated as a high-pass filter. It is found that the exponential profile improves the performance of the filter and the normalized transmission coefficient is given for different values of tapering factor. Finally, we find a lumped equivalent circuit for the filter, whose elements are dependent on the tapering factor. The high-pass characteristics of an ETNUTL are verified with techniques in the frequency domain
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