From what I remember about AEGIS (which isn't much) it's a multitype of radar not solely using RF but also IR and laser technologies, I also think it's constantly connected to satellites. If I remember an article I read years ago correctly Aegis Destroyers could target satellites or provide targeting data on satellites. To knock out every part of the Aegis system you have to knock out the satellite connection, and spoof at least 3 different types of detection. Or more simply knock out power to the ship, can a state of the art stealth craft avoid detection? Yep. An SU nope(unless I remember wrong, possible). Also taking out power would be more feasible in a sense since there is no back up power for those ships.