Reconfigurable Multi-Mode OAM Reflectarray Synthesis with Reduced Number of Active Elements
Conference
Rubio, AJ, Zekios, CL, Kaddour, AS et al. (2022). Reconfigurable Multi-Mode OAM Reflectarray Synthesis with Reduced Number of Active Elements
. 1582-1583. 10.1109/AP-S/USNC-URSI47032.2022.9886293
Rubio, AJ, Zekios, CL, Kaddour, AS et al. (2022). Reconfigurable Multi-Mode OAM Reflectarray Synthesis with Reduced Number of Active Elements
. 1582-1583. 10.1109/AP-S/USNC-URSI47032.2022.9886293
In this paper, a novel approach to synthesize reconfigurable multi-mode reflectarrays (RAs) or transmitarrays (TAs) with the minimum required number of active elements is presented. Namely, we strategically tune the progressive phase delay required for each mode of operation to reduce the corresponding phase errors below a pre-set threshold. Only the unit-cells whose phase error exceeds this threshold are replaced with active elements while the rest use passive elements, thereby reducing cost, complexity, and losses of the system. The performance of the proposed method is studied analytically by synthesizing a multi-mode orbital angular momentum (OAM) RA capable of generating three modes (l = +2, +3, and +4). The RA exhibits high directivity (> 30 dBi), low SLL (<-10 dB), low divergence angle (< 3°), and high aperture efficiency (> 56%) in all three modes of operation, while requiring only 36% of the elements to be active.
