Modeling Partially-Dielectric Unit Cells for OAM Transmitarrays Balmaseda Márquez, Miguel Ángel Valerio, Guido Padilla De La Torre, Pablo Palomares Caballero, Ángel Valenzuela Valdes, Juan Francisco Molero Jiménez, Carlos Circuit Models (CMs) Design equations Dielectrics This work was supported in part by European Union NextGenerationEU/Plan de Recuperación Transferencia y Resiliencia (PRTR) funded by Ministerio de Ciencia, Innovación y Universidades (MICIU)/Agencia Estatal de Investigación (AEI)/10.13039/501100011033 under Grant IJC2020-043599-I; in part by Spanish Government under Project PID2020-112545RB-C54, Project PDC2022-133900-I00, Project PDC2023-145862-I00, Project TED2021-129938B-I00, and Project TED2021-131699B-I00; in part by the Predoctoral Grant FPU21/02219; and in part by European Cooperation in Science and Technology (COST) through the COST Action SyMat under Grant CA18223. The presented study introduces a semi-analytical circuit model (CM) to fully characterize a dielectric unit cell structure made by blocks instead of applying the effective medium theory. A fitting strategy is used to a obtain a better understanding of the properties of the unit cell. Then, the approach is used to develop a semi-analytical model, showing a good agreement with the scattering parameters extracted from a full-wave simulator. By tuning the dielectric material, our model can describe the behaviour of unit cells with different permittivities and electrical sizes. Finally, as an application for the analyzed dielectric unit cells, transmitarrays to generate orbital angular momentum (OAM) waves are designed and 3D-printed. The measured results show good performance for different OAM modes at 31 GHz. 2026-02-23T11:48:04Z 2026-02-23T11:48:04Z 2024-07-29 journal article M. A. Balmaseda-Márquez, G. Valerio, P. Padilla, Á. Palomares-Caballero, J. F. Valenzuela-Valdés and C. Molero, "Modeling Partially-Dielectric Unit Cells for OAM Transmitarrays," in IEEE Access, vol. 12, pp. 110840-110849, 2024, doi: 10.1109/ACCESS.2024.3434646 https://hdl.handle.net/10481/111390 10.1109/ACCESS.2024.3434646 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional IEEE