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Utilice este identificador para citar o enlazar este documento: https://ria.asturias.es/RIA/handle/123456789/11927


Título: Comparison Between Analytic Derivative and the Technique of Differential Contributions in Reflectarray Phase-Only Synthesis
Autores: Rodriguez Prado, Daniel
Arrebola Baena, Manuel
Rodríguez Pino, Marcos
Goussetis, George
Palabras Claves: gradient-based algorithm
optimization
synthesis
reflectarray
array
far field
differetial contributions
finite differences
generalized Intersection Approach
Fecha Edición: Abr-2019
Editor: IEEE
Cita Bibliográfica: D. R. Prado, M. Arrebola, M. R. Pino, G. Goussetis, "Comparison Between Analytic Derivative and the Technique of Differential Contributions in Reflectarray Phase-Only Synthesis", 13th European Conference on Antennas and Propagation (EuCAP), Krakow, Poland, 1-5/04/2019
Resumen: Many algorithms for the optimization of array antennas need the calculation of a gradient to minimize a cost function. Usually, the best approach is to compute analytically the derivatives, since that way computations are faster. However, sometimes the derivatives are cumbersome to obtain or they cannot be calculated, such as when directly optimizing the layout in reflectarrays for cross-polarization improvement. In those cases, derivatives are evaluated using numerical techniques such as finite differences. In this work, we present the numerical technique of differential contributions (DFC) to accelerate gradient-based algorithms when the derivatives are calculated with finite differences, achieving a complexity time scaling of the same order as the analytical derivatives. The technique is applied to a far field phase-only synthesis for reflectarray antennas using the generalized Intersection Approach, and it is compared with the analytic derivatives and the use of finite differences with the FFT. The DFC technique shows superior performance in all cases, even than the analytic derivative.
URI: https://ria.asturias.es/RIA/handle/123456789/11927
ISBN: 978-88-907018-8-7
978-1-5386-8127-5
Aparece en las Colecciones:Ingeniería

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