Researchers at Aalto University have developed metacrystal panels: affordable 3D-printed devices that passively guide radio waves around physical barriers.

Basements, tunnels, large buildings—a weak Wi-Fi or mobile signal in these hard-to-reach places is frustrating. The usual solution is to add more electronics like routers,…

Researchers at Aalto University have developed metacrystal panels: affordable 3D-printed devices that passively guide radio waves around physical barriers.