863 resultados para PRS


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Consultoria Legislativa - Área I - Direito Constitucional, Eleitoral, Municipal, Direito Administrativo, Processo Legislativo e Poder Judiciário - Área XIX - Ciência Política, Sociologia Política, História, Relações Internacionais.

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[ES]En primer lugar, se analiza el contexto investigador tratando de aportar una visión global de la situación de la I+D en el entorno geográfico, institucional y departamental. En segundo lugar, describo de forma somera la temática general en la que enmarcar las dos propuestas de investigación mencionadas así como los objetivos generales que me planteo. En tercer lugar, se realiza aquí una recopilación de los resultados previos de investigación que sirven de punto de partida para las líneas de investigación que aquí se plantean. En último lugar, planteo las dos líneas de investigación con detalle, incluyendo los fundamentos necesarios y resultados preliminares

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A new type of one-dimensional leaky-wave antenna (LWA) with independent control of the beam-pointing angle and beamwidth is presented. The antenna is based on a simple structure composed of a bulk parallel-plate waveguide (PPW) loaded with two printed circuit boards (PCBs), each one consisting of an array of printed dipoles. One PCB acts as a partially reflective surface (PRS), and the other grounded PCB behaves as a high impedance surface (HIS). It is shown that an independent control of the leaky-mode phase and leakage rate can be achieved by changing the lengths of the PRS and HIS dipoles, thus resulting in a flexible adjustment of the LWA pointing direction and directivity. The leaky-mode dispersion curves are obtained with a simple Transverse Equivalent Network (TEN), and they are validated with three-dimensional full-wave simulations. Experimental results on fabricated prototypes operating at 15 GHz are reported, demonstrating the versatile and independent control of the LWA performance by changing the PRS and HIS parameters.

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Référence bibliographique : Rol, 58602

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Référence bibliographique : Rol, 58619