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In this paper, we introduce an innovative 1-bit 28G millimeter-wave Reconfigurable Intelligent Surface (RIS) characterized by a 16×16 array configuration. This RIS is distinguished by its wide beam-steering range of ±60°, which is essential for wireless communication in millimeter-wave frequency bands. The key innovation of our design lies in the optimized placement of diodes within each unit cell. This strategic placement significantly diminishes reflection losses, a prevalent issue in conventional millimeter-wave RIS designs. By focusing on the diode positioning, we have successfully reduced the reflection loss while ensuring the RIS's performance in terms of structural resilience and operational efficiency. Our experimental analysis confirms that this approach not only lowers reflection losses but also maintains the accuracy and range of beam steering. The results of this study have substantial implications for the advancement of millimeter-wave communication technologies, particularly in enhancing signal coverage and quality in emerging wireless networks, including 5G and beyond. The paper demonstrates how the proposed approach of diode placement within RIS can pave the way for more efficient, accurate, and cost-effective solutions in the field of wireless communications.
Li et al. (Sun,) studied this question.
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