A Varactor-Based Reconfigurable Intelligent Surface Concept for 5G/6G mm-Wave Applications
Paper in proceeding, 2024
A varactor-based reconfigurable intelligent surface (RIS) concept is presented for low-cost, high-precision beamforming of 5G/6G mm-waves. To enable this, we maximize the RIS unit cell (UC) phase coverage by (i) employing a varactor diode-tuned slotted-patch UC, and (ii) adding a metallic loop and via fence across the UC boundary, which also improves the bandwidth and angular insensitivity. In an infinite RIS environment, the UC exhibits a phase coverage of 330.7 degrees while maintaining the insensitivity of reflection coefficients up to 50-degree elevation angle. This UC design demonstrates a phase coverage that exceeds 315 degrees with under 0.7-dB reflection loss across a 11.6% bandwidth, where the capacitance tuning ratio of the considered commercial off-the-shelf varactor diode is only 1.8. A 15 × 15 RIS model with a 3-bit phase quantization is used for beam steering performance validation; it predicts the realized gain of 19.5 dBi for the 30-degree beam-steering direction at 28 GHz.
reconfigurable intelligent surface
3-bit phase quantization
5G/6G mm-wave
varactor diode
Author
Yuqing Zhu
Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks
Artem Vilenskiy
Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks
Oleg Iupikov
Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks
Pavlo Krasov
Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks
Thomas Emanuelsson
Ericsson
Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics
Gregor Lasser
Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics
Marianna Ivashina
Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks
18th European Conference on Antennas and Propagation, EuCAP 2024
9788831299091 (ISBN)
18th European Conference on Antennas and Propagation, EuCAP 2024
Glasgow, United Kingdom,
Glasgow, United Kingdom,
Areas of Advance
Information and Communication Technology
Subject Categories
Telecommunications
Communication Systems
Signal Processing
DOI
10.23919/EuCAP60739.2024.10501072