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2023-11-27
An Arduino-Controlled Reconfigurable Intelligent Surface with Angular Stability for 5G mmWave Applications
By
Progress In Electromagnetics Research Letters, Vol. 114, 69-74, 2023
Abstract
The role and applications of millimeter wave (mmWave) Reconfigurable Intelligent Surfaces (RIS) have been rapidly increasing by extending the signal coverage with energy and spectrum efficiency. However, the current RIS designs pose challenges like size and angular insensitivity with efficient beamforming functionalities. In this article, we propose a compact and angularly stable RIS unitcell with incident and polarization angle insensitivity in reflection mode. The footprint of the FR4 substrate is 10x10x1.6 mm3 in size. The unitcell structure consists of circular patch inner cuts as a top layer with a full ground. An AlGaAs pin diode is inserted in the middle of the top layer to get the beamforming. The switchable states provide peak resonance at 32.5 GHz (Bandwidth-444 MHz) and 33.6 GHz (Bandwidth-498 MHz) frequencies. Significant gain values of 11.5 and 13.7 dBi are achieved at the operating frequencies. The designed unitcell provides angular stability up to 90˚ oblique incidences and polarization angles. The AlGaAs pin diode is controlled by applying suitable bias levels using Arduino Uno. The numerical simulation results and experimental validation are performed with incident and polarization angles, which are suitable for adapting to the challenges in mmWave applications.
Citation
Badisa Anil Babu, Pulletikurthi Ram Kalyan, Varanasi Venkata Lakshmi, Rana Reharika, and Nakka Varun Raj, "An Arduino-Controlled Reconfigurable Intelligent Surface with Angular Stability for 5G mmWave Applications," Progress In Electromagnetics Research Letters, Vol. 114, 69-74, 2023.
doi:10.2528/PIERL23091903
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