424 resultados para Serras circulares
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Pie de imp. t.II: Imprenta de Luis Palacios.
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Texto conocido como "Las leyes de la peregrinación"
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Mode of access: Internet.
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Missa de que Vsam os antigos christaos de Sao Thome do Bispado de Angamalle das Serras do Malauar da India Oriental ..., [9] h.
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Mode of access: Internet.
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Mode of access: Internet.
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Precede al tit. : Ministerio de Fomento. Instrucción Pública.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Contiene un índice alfabético de las materias que tratan las Providencias generales expedidas desde el año de 1760 hasta el presente...
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Mode of access: Internet.
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Mode of access: Internet.
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The microstrip antennas in your simplest form consist of a ground plane and a dielectric substrate which supports a conductive tape. As these antennas have some limitations, this work presents a study of anisotropic substrates, as well as some results in microstrip antennas with circular patch, aiming to overcome these limitations, especially in applications at 4G technology. These anisotropic substrates are those in which electrical permittivity and magnetic permeability are represented by tensors of second order. The study consists of a theoretical analysis of substrates and development of a mathematical formalism, the Transverse Transmission Line Method, aimed the application of these substrates in microstrip antennas. Among the substrates used in this study, there are the ferrimagnetic and metamaterials, in which some miniaturizations of the antennas are achieved. For antennas with circular patch, are considered arrays and modified ground planes in order to achieve improvement in parameters, in particular, gain and bandwidth. Several simulations have been made and antennas were constructed so that the measured values could be compared with the simulated values.