OFP doesn't come with any AP mines. But you can easily simulate one. Try this:
place a "anybody present" trigger with a very small (1 meter?) radius.
condition: "man" counttype thislist > 0
on activation: "grenade" camcreate getpos this , or maybe getpos (thislist select 0)
This will activate the trigger only if a "man" is in the trigger area, not a "tank" or "car" or "air", etc