Cross-Polarization Control in FSSs by Means of an Equivalent Circuit Approach Molero Jiménez, Carlos Alex Amor, Antonio Mesa, Francisco Palomares Caballero, Ángel Padilla De La Torre, Pablo Frequency selective surface Equivalent circuit approach Co- and cross-polarization terms Metamaterials This work was supported in part by Spanish Research and Development National Program under Project TIN2016-75097-P, Project RTI2018-102002-A-I00, Project TEC2017-84724-P, Project PID2020-112545RB-C54, and Project EQC2018-004988-P; in part by the Predoctoral under Grant FPU18/01965; and in part by Junta de Andalucia under Project P18-RT-4830 and Project B-TIC-402-UGR18. This paper presents an ef cient equivalent circuit approach (ECA), based on a Floquet modal expansion, for the study of the co- and cross-polarization in frequency selective surfaces (FSS) formed by periodic arrays of patches/apertures in either single or stacked con gurations. The ECA makes it possible the derivation of analytical expressions for the generalized scattering parameters associated with the proposed circuit networks. Furthermore, the proposed circuit approach is an ef cient surrogate model that can be combined with optimization techniques and arti cial intelligence algorithms for the ef cient design of FSS structures, saving efforts in the computation compared to time-consuming full-wave simulators and tedious synthesis (simulation-assisted) techniques. Due to the simplicity of the topology of the involved networks, the ECA can also be advantageously used to gain physical insight. The proposed approach is applied and validated in different FSS con gurations where the cross-pol component plays a fundamental role in the design, as in circular polarizers, polarization rotators, and reflectarray cells. 2021-09-17T10:54:56Z 2021-09-17T10:54:56Z 2021-07-12 info:eu-repo/semantics/article C. Molero... [et al.]. "Cross-Polarization Control in FSSs by Means of an Equivalent Circuit Approach," in IEEE Access, vol. 9, pp. 99513-99525, 2021, doi: [10.1109/ACCESS.2021.3096715] http://hdl.handle.net/10481/70261 10.1109/ACCESS.2021.3096715 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España IEEE