Perspectives of the european academic research in the microwave..

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Condiciones de existencia de modos de orden superior en estructuras planares

Conditions for existence of higher-order modes of the reduced wave equation V2 u + Au = 0 on semi - infinite domains subjected to different boundary conditions are presented and applied to the slot line. Bounds for the lowest eigenvalues are obtained using the Method of Moments.Peer ReviewedPostprint (published version

RCS of engine inlets by a spectral iterative technique

A novel algorithm designed to compute efficiently and accurately the HF electromagnetic scattering from open-ended waveguide cavities is presented. The cavity is converted into a stepped-waveguide model so that the field spectrums are propagated, forward and backward, along each waveguide section. As boundary conditions for perfect electric conductors are applied via image theory, they are of local nature and take into account only the first order interactions between each pair of waveguide sections. Accordingly, additional forward-backward iterations must be performed if multiple interactions are to be taken into account. Finally, the RCS due to the interior irradiation is calculated by a Kirchhoff-based aperture integral. Good agreement with Method of Moments and Hybrid Modal solutions is found, as well as with experimental data, for 2-D and 3-D cavities.Peer ReviewedPostprint (published version

Modal analysis of coupling problems in optical fibers

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Bidimensional scattering of tm and te polarized waves by dielectric

In the study of electromagnetic radiation effects over dielectric bodies, effective numerical methods are needed. At present, there is a lack of tools for measuring this effects and due to the huge growth of microwave devices, like cellular radio telephones working close to the human body, it is necessary to develop accurate numerical methods for evaluating those effects. One of the most efficient and extensively used method is the FFT-CGM (Fast-Fourier-Transform Conjugate Gradient Method). In this paper, algorithms for solving the two-dimensional scattering of transversal magnetic (TM) and transversal electric (TE) polarized waves by a lossy dielectric and metallic objects are presented. At the same time, the SAR (Specific Absorption Rate) of tissues and the modified radiation diagrams when the body is present are obtained from the diffracted fields.Peer ReviewedPostprint (published version

Caracterización electromagnética de materiales RAM mediante medidas en espacio libre

A free-space measurement system in the 2-JBGHz frequency range is used to measure the reflection and transmission coefficients of planar samples. The complex electric permittivity and the magnetic permeability are calculated from the measured values of S11 and S21. The measurement system consists of broadband transmit and receive antennas, a network analyzer, mode transitions, and a computer. Error due to multiple reflections between antennas via the swjace of the sample are corrected by using a free space T.R.L. calibration technique.Peer ReviewedPostprint (published version

Obtención y medida de dieléctricos para la construcción de maquetas biológicas en microondas

Studies about microwave imaging systems require complex models of biological materials to test the performance of prototypes in realistic situations. Tissue phantom materials have been studied and measured in order to determine their suitability to simulate biological substances around 2.45 GHz. The paper presents sorne dielectric constant data of tissues and phantom materials.A permitivity measurement system,based on an open-ended coaxial line, is also presented. Several materials and mixtures for phantom construction have been cbaracterized using this method,and the relevant measurements have been tabulated.Peer ReviewedPostprint (published version