Researchers at Aalto University have developed passive 3D-printed panels that can redirect and control wireless signals without electronics, power sources, or active control systems.
The structures, called metacrystals, could help boost 4G, 5G, and WiFi signals in your home, solving the issue of dead zones. This would especially be helpful for basements, warehouse aisles, tunnels, and crowded indoor venues.
The best part is that these panels are not expensive and incredibly easy to install.
The metacrystal panels use their engineered 3D geometry to shape radio waves.
Once installed, they can continuously redirect wireless signals toward areas where coverage would otherwise be poor.
Doctoral researcher Mahdi Asgari compared the idea to using mirrors in a dark room. Instead of adding more lamps, mirrors can guide available light. In the same way, metacrystals guide radio waves.
Asgari said the volumetric design also gives these structures an advantage over earlier single-layer intelligent surfaces, because they can control multiple incoming signals or frequency bands independently.
The panels do not need electronics, a power source, or active controls.
They can be placed on walls, ceilings, furniture, and other surfaces to guide signals around corners, into weak coverage areas, or toward specific users and devices.
Unlike many existing intelligent surfaces, the panels can process multiple incoming waves at the same time. They can also work across different frequency bands, operate in reflection or transmission mode, and absorb unwanted signals completely.
Traditional reconfigurable intelligent surfaces often need many tunable components and complex control systems, which makes them costly and harder to deploy.
By comparison, the metacrystal panels can be made through 3D printing. The consumable material cost is estimated at only a few tens of euros per panel. The manufacturing process also allows panels to be designed for specific locations instead of relying on a single standard design for every environment.
Asgari said the most attractive industrial use cases are static or slowly changing places such as factories, indoor 5G and 6G networks, warehouses, and long corridors. In such locations, a passive panel designed for a known layout could be cheaper and simpler than an actively controlled surface that needs continuous maintenance.
According to Asgari, advanced electromagnetic functions can now be built into a low-cost plastic structure that can simply be mounted on a wall.
Once installed, the panels can improve coverage without ongoing operation or maintenance. They rely only on their physical design to guide signals.
The research team is now looking for ways to commercialize the technology. It is also seeking industry partners interested in programmable metasurfaces, intelligent wireless infrastructure, and low-cost passive signal control systems.
Asgari said the goal is to see scalable smart wireless environments used in indoor spaces and outdoor urban settings in the future.
The researchers now want to move beyond fixed panel designs.
Their next goal is to develop reconfigurable panels that can adapt as wireless conditions change.
Current reconfigurable intelligent surfaces are often too expensive and complicated for broad industrial use, so the team is studying simpler manufacturing methods for tunable panels that remain practical and affordable.
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