This work presents a comparison between a number of numerical techniques for the copolar synthesis of reflectarray antennas. These techniques are based on the generalized intersection approach. The classical phase-only synthesis (POS) is considered using different methodologies to compute the gradient: the analytical approach by exactly calculating the derivative and two numerical methods based on finite differences, one using the FFT and another the technique of differential contributions (DFC). In addition, a direct layout optimization (DLO) for copolar synthesis is also considered. In order to make the DLO efficient, a surrogate model of the unit cell is employed. A computing time study is presented, showing that for copolar only synthesis at a single frequency, the POS technique using DFC has superior performance. Finally, a large reflectarray with European footprint for satellite broadcasting is synthesized, comparing the results obtained with all techniques.
International Conference on Electromagnetics in Advanced Applications (ICEAA) (21st. 2019 Granada, Spain)
This work was supported in part by the Ministerio de Ciencia, Innovación y Universidades under project TEC2017-86619-R (ARTEINE); by the Ministerio de Economía, Industria y Competitividad under project TEC2016-75103-C2-1-R (MYRADA); by the Gobierno del Principado de Asturias/FEDER under Project GRUPIN-IDI/2018/000191; by the Gobierno del Principado de Asturias through Programa “Clarín” de Ayudas Postdoctorales / Marie Curie-Cofund under project ACA17-09; by Ministerio de Educación, Cultura y Deporte / Programa de Movilidad “Salvador de Madariaga” (Ref. PRX18/00424).