A speculative radar response to a small-drone swarm

Could a directed electromagnetic pulse disable drones by affecting their electronic systems?

Existing ideas and a warship's radar are suggested as possible means of threatening small drones, without a demonstrated capability.

The directed-EMP proposal targets drones' electrical and electronic systems. A separate speculative suggestion is for a major warship to direct its radar at a drone swarm. Small drones are expected to be especially vulnerable in that example. No test result, system specification or demonstrated engagement range is supplied.