Some types of radar may be powerful enough to qualify as microwave weapons, David Hambling explains (in Swarm Troopers:
The latest upgrade to the Active Electronic Steered Array (AESA) radar on the F-22 and F-15 fighters, known as APG-63(V)2, is said to be powerful enough to damage the guidance electronics on incoming cruise missiles at close range. This might be a better way for a fighter to tackle drones, as it has an unlimited supply of ammunition and can zap them one after the other.
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It is possible to shield electronics against EMP by placing them inside a conducting “Faraday cage” and ensuring that any external receivers such as antenna are protected. This is easier with a small device, such as the control system for a small drone, than a large one. In addition, the dispersed nature of the swarm means the geometry of the attack will only be favorable for some of them, and much of the swarm is likely to survive a single pulse.
Those Harriers operated by the Marines in the Red Sea were blasting the Iranian drones out of the sky with 25 mm cannon fire. Don’t these American warplanes have cannon with radar fire-control that gives a “solution” to the pilot allowing an accurate shot? A single burst of 25 mm and the drone’s gone.
Each “kill” represents 1/2 of an enemy “killed”.