Cheap drones have made air-defence arithmetic ugly: interceptors costing hundreds of thousands of dollars chasing airframes costing hundreds. A microwave cannon is the latest attempt to flip that equation back, and a new report at Golem describes high-power microwave weapons being pitched specifically as a counter to drone swarms.
The mechanism is not subtle. High-power microwave (HPM) systems emit a directed burst of electromagnetic energy that induces damaging currents in the electronics of whatever they strike. Aimed at a formation of quadcopters, the beam can drop many of them at once — with no ammunition to exhaust beyond the power feeding the emitter. The cost per shot collapses toward the price of electricity.
The logic is what militaries call the cost curve. A swarm is a threat precisely because it is cheap per unit: anyone answering it with interceptor missiles or even gun systems pays a multiple of the target's price for every kill. Directed energy inverts that, because a single pulse can engage many targets.
Electronic warfare has also hit limits that make the approach more attractive. Jamming was long the default answer to small drones, but fibre-optic-guided drones are immune to radio jamming because they carry no radio control link at all — a design that has spread in the war in Ukraine and is pushing armies back toward kinetic and directed-energy systems.
The obstacles are real. Effective HPM range is short, often a few hundred metres up to about a kilometre, which positions these weapons as close-in protection for bases, airfields and critical infrastructure rather than wide-area defence. Power supply and cooling are substantial. And collateral effects are unavoidable: the same pulse that disables a hostile drone can interfere with friendly radios, navigation and drones. A microwave cannon is an area zapper, not a precision instrument.
Several programmes of this class are running in the United States and Europe, from Epirus's Leonidas to Raytheon's CHIMERA and the UK's Radio Frequency Directed Energy Weapon. The new report adds another system to that picture — and fits a week in which balloon-borne radar is also being discussed as a fix for low-altitude airspace surveillance.
Still open: Golem describes a proposed capability, not a combat-proven system. Range under real conditions, reliability across many shots, and effect against hardened electronics are not publicly settled.
