Wideband Dual-Polarized 1-Bit Unit-cell Design for mmWave Reconfigurable Intelligent Surface

Gabriel Goncalves Machado, Muhammad Ali Babar Abbasi, Adrian McKernan, Chao Gu, Dmitry Zelenchuk

Research output: Contribution to conferencePaperpeer-review


This study presents a novel reflective unit-cell with wideband characteristics at millimeter-wave (mmWave) bands for application in Reconfigurable Intelligent Surfaces (RIS). The proposed unit-cell design demonstrates through full-wave simulations a superior bandwidth performance over the26.5029.45GHz, targeting the n257 band of mmWave 5G. The design was created for dual-polarization operation, each controlled by a p-i-ndiodetorealisea1-bitRIS. The design achieves impressive performance, maintaining a phase difference error within ±20 degrees across most of the 3GHz bandwidth while reflecting over 80% of the energy. The increased reflectivity minimizes losses, while precise phase control improves beam pointing accuracy, crucial in low-complexity 1-bit systems. Numerical simulations also indicate that this unit-cell performs effectively in a 6-layer PCB stack-up. A comparison with state-of-the-art unit-cells for RIS design is also presented, demonstrating the advantages of the proposed design in terms of bandwidth, dual-polarization operation, and phase accuracy.
Original languageEnglish
Publication statusAccepted/In press - 18 Dec 2023
Event18th European Conference on Antennas and Propagation - Glasgow, United Kingdom
Duration: 17 Mar 202422 Mar 2024


Conference18th European Conference on Antennas and Propagation
Abbreviated titleEuCAP 2024
Country/TerritoryUnited Kingdom
Internet address


  • antennas
  • mmWave
  • RIS
  • unit-cell
  • reconfigurable


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