Antenas lentes con metamateriales y su aplicación en tecnología espacial

Los metamateriales son estructuras artificiales que se desarrollan para manifestar diversas propiedades electromagnéticas que no están presentes en materiales que se encuentran en la naturaleza. En este trabajo se presentan antenas lentes biconvexa plana diseñada con metamateriales utilizando materiales no homogéneos, con la finalidad de ser aplicada a la detección de satélites de órbita baja. Se analizaran características de lentes construidas con constante dieléctrica variables y lentes binarias de zonas de Fresnel. Se describen las ecuaciones de diseño de los modelos de lentes planos, con el objetivo de obtener su mejor implementación. Un análisis físico de la estructura nos permitirá evaluar su peso y tamaño. Haciendo una analogía con antenas reflectoras, se estudiaran los parámetros característicos de cada antena lentes, analizando su eficiencia, su ganancia y su relación frente espalda. Los resultados son analizados realizando simulaciones con software electromagnético en cada tipo de lente. Las antenas lentes tienen la particularidad de permitir movilidad del haz o lograr haces múltiples, solo con el movimiento del alimentador principal en un plano. Se mostraran simulaciones logrando diferentes posiciones del haz principal en función de la posición del alimentador principal.Facultad de IngenieríaCentro de Investigaciones Óptica

Study of optical vortices in lens antenna

This work presents an analysis of optical vortices produced by homogeneous dielectric lens antenna with hyperbolic profiles in the millimeter waveband. The use of dielectric lenses can substantially improve the antenna parameters, especially the flatness of the radiated waves and the gain of the antenna. Simulations are performed using a recently published electromagnetic simulation code. The program yields field intensity and field phase graphics, allowing the analysis of the stationary field resulting from the feeder-lens array and its radiation pattern. In the phase graphics, diffraction effects are observed when the lens presents flat edges, evidencing the presence of optical vortices.Facultad de Ingenierí

Understanding the Analytical Formulation of the Characteristic Modes of a Metallic Sphere

International audienceThe problem considered in this paper concerns with the study of the theory of characteristic modes applied to a conducting sphere. For this canonical case modes are obtained analytically. This work help us to understand better how the theory of characteristic modes works on this structure to reveal interior (cavity) and exterior (radiating) resonances. This knowledge will be used in future work to explain the radiation and the resonances appearing in dielectric resonator antennas

A 60-GHz coplanar-waveguide-fed slot-coupled rectangular DRA design using the theory of characteristic modes

International audienceA novel method to design a coplanar-waveguide-fed slot-coupled rectangular dielectric resonator antenna is presented in this paper. This study permits to optimize the radiation bandwidth in the same analysis process for both the dielectric and the slot. The complete antenna is designed for low-temperature co-fired ceramic fabrication. The goals are to fabricate all the antenna for low permittivity in the same process, to match the dielectric resonator to the coplanar-waveguide-fed line for the frequency range of ISM at 60 GHz. The obtained results show that the proposed antenna radiation bandwidth determined by -10 dB return loss can be as large as 14 GHz, more than 23% centered at about 60 GHz