Open AccessActive Reflectors: Possible Solutions Based on Reflectarrays and Fresnel Reflectors
Author(s) -
Lorena Cabrìa,
José Ángel García García,
Julio Gutiérrez-Rı́os,
A. Tazón,
J. Vassal’lo
Publication year - 2009
Publication title -
international journal of antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.282
H-Index - 37
eISSN - 1687-5877
pISSN - 1687-5869
DOI - 10.1155/2009/653952
Subject(s) - reflector (photography) , fresnel zone antenna , antenna (radio) , radiator (engine cooling) , optics , computer science , radiation pattern , phase (matter) , conformal map , reconfigurable antenna , electronic engineering , engineering , physics , telecommunications , slot antenna , geometry , mathematics , antenna efficiency , light source , quantum mechanics
An overview about some of the recent Spanish developments on active reflectors is presented. In the first part, a novel beamsteering active reflectarray is deeply studied. It is based on implementing in each elementary radiator an IQ modulator structure, in which amplitude and phase control of the scattered field is achieved. Finally, a special effort is made in offering solutions to overcome the active antenna integration problems. In the second part, the active concept is firstly extended to Fresnel reflectors. Thanks to the development of a proper simulator, this special structure can be easily analysed. This simulator allows the study of performance of this kind of reflectors and, applying evolutionary algorithms, to find optimal configurations of reflector in accordance with the given specifications for the conformal radiation pattern
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