ENG: Aalto University researchers have developed low-cost metacrystal panels that could help future 6G networks overcome one of their major limitations: signal blockage. As wireless systems move toward higher-frequency communication, they can offer much higher data rates, yet the signals become more sensitive to walls, corners, people, and other obstacles. Instead of adding more powered equipment such as routers, repeaters, or base stations, the proposed approach turns parts of the built environment into passive wireless infrastructure.