I think the main reason we don't see the use of EMP weapons is because of collateral damage. Ukraine isn't fighting from a position of little to no electronics, they still rely on radios for communication, radar for enemy detection, their own drone supplies, they are near civilian infrastructure, and they have neighboring countries that would not be happy to get random strong EM noise even if its far enough away to not cause any real damage.
Maybe smaller scale DIY EMPs wouldn't be as effective as I think, they would have to be pretty close to their target to do real damage to non-radio devices, however I think collateral damage is the biggest reason we don't see them.
Drones are weak and fragile enough already that it just easier to shoot or blow them up rather than try to lob a grenade sized EMP up near them, a regular grenade explosive would be similarly or more effective without the extra complexity. But something like a mobile turret platform or multiple smaller ground bots I can see it being the best option.
Maybe smaller scale DIY EMPs wouldn't be as effective as I think, they would have to be pretty close to their target to do real damage to non-radio devices, however I think collateral damage is the biggest reason we don't see them.
Drones are weak and fragile enough already that it just easier to shoot or blow them up rather than try to lob a grenade sized EMP up near them, a regular grenade explosive would be similarly or more effective without the extra complexity. But something like a mobile turret platform or multiple smaller ground bots I can see it being the best option.