After Tony had added a special unit to the back of the shield, it was possible for Cap to “summon” the shield back to his hand, no matter where he threw it. This ability is quite similar to Thor when he summons the hammer Mjolnir. Of course, the shield’s active range is much lower than the Mjolnir.
Cap’s throwing force can be said to be very strong, its impact force can easily tear a running truck or cut an armored tank into two. In addition, this Vibranium shield also knocked many other superheroes unconscious like Beast, Wolverine or even Hulk, with only one throw of Cap.