How to Hack Other People’s Drones for Less Than $400
http://www.tomsguide.com/us/skyjack-hacks-drones,news-17943.html
That drone hacking link is pretty interesting.
However, if you’re just interested in disabling one, I would think another drone that could intercept and drop some sort of propeller-fouling material (pieces of string, for example) would be low tech and very effective.