Imagine a fleet of small drones patrolling the skies for four straight days— no battery swaps, no pit stops for recharging, just a tireless "mechanical swarm" streaming back intelligence nonstop. It sounds like something out of science fiction, but U.S.-based GuRu Wireless is turning this vision into reality. Their latest demonstration features a transmitter array packed with more than 70,000 synchronised millimetre-wave emitters, the largest scale ever achieved in a single phased-array system. In | other words, they've built an "invisible energy web" capable of delivering power precisely to airborne drones from hundreds of meters away.

Drones have already become indispensable tools in modern military and national security. From border patrol to maritime surveillance, battlefield reconnaissance to counter-drone operations, small unmanned aerial systems (sUAS) are expanding rapidly. Yet their biggest weakness is energy. Limited battery capacity caps flight time at just a few hours. Even with advanced lithium batteries or hybrid systems, energy density remains a bottleneck. This forces drones to return frequently. Interrupting missions and restricting operations are particularly problematic for continuous or covert tasks in complex battlefields. Alternatives have been explored: solar-powered drones lack consistent efficiency; fuel cells struggle with bulk and weight. Gußu Wireless, however, turned to a new answer-wireless power, making electricity flow through the air like W1-F1

Their approach uses directed energy transmission in the millimetre-wave band. The system is built from a colossal matrix of over 70,000 tiny transmitters, all working in perfect synchrony like dancers moving in unison. Together, they focus power into an invisible beam aimed at the drone's receiver. Think of it like focusing sunlight through a magnifying glass, but instead of light, they're using millimetre waves, controlled in real time by electronic signals. As a result, even fast-moving drones can be tracked by the beam, receiving a constant stream of energy. In controlled tests, GuRu Wireless powered a small drone continuously for more than 96 hours- four full days aloft, completely breaking free from the traditional limits of batteries. Now, imagine a drone swarm patrolling a border nonstop, with no need to return to base or rely on ground crews for resupply.

One of the hardest problems in wireless power has always been distance. Conventional wireless charging is limited to just a few centimetres or meters, your phone's charging pad being a familiar example. But GuRu Wireless transmitters can deliver more than 1 kilowatt of power across distances exceeding 100 meters. To put that into perspective, 1 kilowatt is enough to simultaneously power a high-performance laptop, a drone's onboard camera, and its propulsion system. Even at 50 meters, the system maintains 500 watts, crossing the critical threshold required to recharge small drones mid-flight while running all their payload systems, from HD cameras to infrared sensors.

What makes the technology even more compelling is its modularity and scalability. GuRu Wireless hasn't confined it to a lab prototype; they've built it for real-world flexibility. Whether it's a compact transmitter for rapid battlefield deployment or a vast wide-area network covering borders, coastlines, or military bases, the system can be adapted. It's like giving drones a "wireless charging map,” where energy stations of different sizes can be placed strategically to keep them airborne without interruption. 

So far. GuRu Wireless has showcased its achievements in lab and controlled settings, with plans to conduct open-air demonstrations in the coming months. When that happens, the role of drones could be fundamentally redefined from short-term "sky visitors" to long-endurance energy sentinels" capable of maintaining their watch indefinitely. GuRu Wireless millimetre-wave energy array is like a magician in the sky, breaking the chains of batteries and ushering drones into an era of "never landing.* Quietly but surely, a wireless world of freely flowing energy is beginning to take shape.

（Writer：Ganny）