First, the Army is intending to deploy tank rounds intended for drones. See here.
Second, Big Country Expat has been doing some thinking about the more quick and easy to develop stuff.
Now, as far as (and I know this’s going to go over like the proverbial lead balloon,) but I have a COTS idea that could be implemented right here, and right now… As I discussed with Herschel last evening or the night before…
My Idea utilizes pre-existing stuff… In this case it’d be the M7/M243 LVOSS or Light Vehicle Obscuration Smoke System to dispense an anti-drone package. The anti-drone rounds would be new, but easily and cheaply made/manufatured.
I make my own ‘timed/fused’ fireworks legally here for holidays for my 37mm Launcher… If -I- can make them here, utilizing a glue gun, some black powder, and learning how to time my visco?
So easy, even an Airborne Infantryman can do it LOL.
As it is, currently, the LVOSS is/was used to ‘throw mad amounts of smoke’ in Iraq and Afghanistan during ‘negative crowd issues’ i.e. protests and/or riots. The launchers themselves individually look like this:

Each tube on a M7 launch tube is 66mm in diameter wide round, and about 5.75 inches (the round itself) in the pic above long… meaning the overall length is about 7.28 inches long, but the Boomy-Boom part of the round itself is about 5.75 inches by 66mm which is 2.6 inches wide. The round has the capacity in that picture of having a 19oz payload…
Remove that Red Phosphorous/Butyl Rubber Smoke Composition?
Replace that and Load the shell with #4 Turkey Shot?
Well the payload for the above-stated round is 19 ounces.
The math said a comparable 19-ounce load of #4 lead shot would contain approximately 2,584 pellets. #4 lead shot contains about 136 pellets per ounce. Therefore, 19 ounces * 136 pellets/ounce equals roughly 2584 pellets.
Finally, there is the extremely high tech.
So for microdrones, if you want to be capable of defense in a real-time big war, this has become a rich man’s game.