Dual Polarized Dual Coverage Reflectarray-Based Passive Reflecting Surface for Next-Generation Networks

A single-layer reflectarray configuration is investigated for dual-polarization operation at 5G millimeter wave (mmWave) frequencies. The proposed reflectarray cell is designed as a viable solution for passive reflecting surfaces to enhance 5G network coverage. It consists of two alternating pairs of miniaturized linearly polarized patches, each operating at the same resonant frequency but rotated by 90∘ to enable dual polarization. This design allows independent phase tuning for each polarization, features an ultra-thin structure (∼0.0237λ at 28 GHz), and maintains compact cell dimensions (∼0.4λ at f=28 GHz), ensuring seamless integration and conformability to the support surface while preserving beam-focusing capabilities at large scan angles. A 28 GHz reflectarray-based passive reflecting surface is designed and experimentally validated as a solution for 5G blind spot scenarios, demonstrating independent backscatter for each polarization and enabling dual-coverage, dual-polarized operation. This independent dual-polarization control enables practical benefits, such as improved link reliability in NLoS (Non-Line-of-Sight) environments, simultaneous coverage of distinct zones, and potential support for multiple service providers to share the same frequency, thus highlighting the versatility and practical relevance of the proposed configuration. Due to its compactness, polarization flexibility, and cost-effectiveness, this configuration is a promising candidate for next-generation mmWave telecommunications, particularly in dense urban environments.