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5G’s millimeter-wave technology can deliver incredibly fast wireless speeds, but it has an annoying weakness: those signals don’t like getting around things. Walls, furniture, people, and even moving a few feet can cause mmWave connections to weaken dramatically. Now, researchers at the University of California San Diego are proposing a surprisingly boring solution: cheap reflective tiles that simply bounce the signal where it needs to go.

mmWave sits at the higher-frequency end of wireless communications and offers much more bandwidth than conventional cellular frequencies. That’s what makes it attractive for extremely high-speed connections, but the trade-off is propagation. Signals can suffer significant path loss and are particularly vulnerable to obstructions.

As you’d expect, that creates a frustrating scenario indoors. A phone might have an excellent mmWave connection in one spot, only for the signal to fall apart after someone walks between it and the access point. Fixing that normally means adding more access points, powered relays, or sophisticated reconfigurable intelligent surfaces, all of which add cost and complexity. Thankfully, UC San Diego’s idea is considerably simpler: don’t generate another signal, just redirect the one that’s already there.

The researchers developed passive metasurfaces, essentially 3D-printed reflective tiles designed to redirect mmWave signals. The tiles don’t need batteries, power supplies, control electronics, or constant coordination. Instead, multiple inexpensive surfaces can be arranged around an environment to guide wireless signals toward areas that would otherwise be poorly covered.

The UC San Diego team calls the approach FlowForm, and its research suggests that networks of these cheap passive surfaces can rival more expensive active approaches. At roughly $2 per tile, the economics are particularly interesting: rather than installing another complicated piece of networking hardware every time a signal hits a troublesome wall, a building could potentially use a collection of almost comically simple reflectors.

Of course, this doesn’t mean every 5G tower suddenly needs to be surrounded by a wall of shiny tiles. The technology is still research, and real-world deployment would involve figuring out how many surfaces are needed, where they should be placed, and how well they perform in different environments.

But the underlying idea is compelling because it tackles one of mmWave’s biggest problems without adding another power-hungry gadget to the network. As wireless systems push toward ever-higher frequencies and faster connections, sometimes the cleverest solution isn’t another complicated chip or antenna. Sometimes, apparently, it’s a $2 piece of plastic telling a radio signal where to go.

Varun is an experienced technology journalist and editor with over eight years in consumer tech media. His work spans…