A 2-Bit Reconfigurable Reflecting Metasurface for Mm-Wave Applications

• Published in: 2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (USNC-URSI) pp. 1425 - 1426
• Main Authors: Ahmed, Fahad, Melouki, Noureddine, PourMohammadi, Peyman, Gheisanab, Hassan Naseri, Denidni, Tayeb A.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 23-07-2023
• Subjects: Capacitance; Conferences; Metasurfaces; Mutual coupling; Reflection; Reflector antennas; Varactors
• ISSN: 1947-1491
• DOI: 10.1109/USNC-URSI52151.2023.10237890

This paper presents the 2-bit reconfigurable reflecting metasurface for mm-wave frequency band. A low capacitive varactor diode is installed between the unit cells to achieve four different phase states. Moreover, the row-wise feeding is applied, and different coding sequences are used to distribute the reflection phases on a phase gradient metasurface to direct the beam at desired angles. The capacitance of the varactor diode is varied from 0.04pF to 0.2pF to obtain phases varying from 0° to 360° reflection phases with a phase step of 90°. The distance between two adjacent unit cells is kept nearer to lambda/2 to avoid mutual coupling. The design is low loss and can maintain angle reciprocity at the proposed operating frequency band. These functionalities make this reconfigurable reflecting metasurface a great candidate for antenna arrays for 6G communications.