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A Reconfigurable Intelligent Surface for 3.6 GHz Based on a Double Squared Slot Shaped Element

Oliveira, T.O. ; Reis, J. R. ; Cuiñas, I. C ; Caldeirinha, R. F. S.

A Reconfigurable Intelligent Surface for 3.6 GHz Based on a Double Squared Slot Shaped Element, Proc European Conference on Antennas and Propagation - EuCap, Stockholm, Sweden, Vol. , pp. - , April, 2025.

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Abstract
In this paper, a reconfigurable intelligent surface (RIS) designed to operate at 3.6 GHz featuring a double square unit cell layout, is presented. The unit cell includes two varactor diodes, enabling reconfigurable functionality. Two RIS configurations, with dimensions of 5×5 and 10×10, each employing the proposed unit cell, are studied. Simulation results demonstrate the reconfigurability of both configurations, effectively steering incident waves toward specified angles. The 5 × 5 RIS achieved an aperture efficiency of η = 42.7% at a reflection angle of 25º highlighting the unit cell’s effectiveness. To validate the design, a prototype of the 5 × 5 fabricated. Preliminary results obtained on the prototype yield to a scanning angle region of 20º with the best performance being achieved on the frequency range from 3.5 to 3.7 GHz.