High-Power Microwave (HPM)
High-Power Microwave systems neutralize drones by directing an intense burst of electromagnetic energy at their onboard electronics — inducing damaging currents and voltage spikes in flight controllers, sensors, and communications hardware. Unlike RF jamming or GNSS spoofing, which target a drone's communications or navigation systems, HPM attacks the hardware itself, which is precisely what makes it relevant against threats those other methods can't touch: autonomous, encrypted, and even fiber-optic-controlled drones remain vulnerable if the microwave pulse couples effectively into their circuitry.
How it works
An HPM emitter — typically cued by radar, RF detection, or EO/IR for targeting — releases a burst of microwave energy into the threat area. If the energy couples into the drone's electronics with sufficient intensity, it disrupts or permanently damages flight-control systems, navigation modules, and other onboard components, regardless of how the drone was being flown or controlled at the time.
Why it's used
Two problems are driving interest in HPM: drones that electronic warfare can't reliably defeat, and drone swarms that overwhelm one-target-at-a-time defenses. Because HPM attacks hardware rather than communications, it doesn't care whether the drone was autonomous, encrypted, or fiber-optic-controlled. And because the effect covers an area rather than a single beam, one pulse can potentially disable several drones inside its footprint at once — a capability few other C-UAS technologies offer. It's also effectively ammunition-free: as long as there's power, the system can keep engaging.
Common types
Fixed-site systems — installed at high-value facilities where larger power and cooling infrastructure is practical.
Vehicle-mounted systems — mobile protection for maneuvering forces, an increasingly active area of development.
Containerized systems — package emitter, power, and cooling into a transportable unit for rapid deployment.
Networked architectures — multiple HPM systems tied together for overlapping coverage and coordinated engagement, aimed specifically at complex swarm attacks.
Strengths and limits
Breadth of effect is HPM's defining advantage: it works against nearly any drone type regardless of how it navigates or communicates, and it can hit multiple targets in one pulse, which few other mitigation technologies can claim. Engagement is also essentially instantaneous, since the energy travels at the speed of light, and there's no ammunition to run out of. Against that, HPM systems demand substantial electrical power and cooling infrastructure, which keeps most current platforms large and complex; effective range is more limited than radar's detection range, since energy density falls off with distance; and hardened, shielded military-grade drones can resist the effect. Friendly electronics inside the engagement zone may also need protection or careful deconfliction. The technology is comparatively new and expensive next to established options like RF jamming, though deployment is expanding quickly.