EMPs come from the detonation of nuclear devices, I am unaware of any weapons that actually focus it into a beam. I imagine it would be prohibitive
to have a satellite with this type of weapon if it could exist, because it would have to have, amoung other things, a very tight range of
specifications. It couldn't, for example, take out a truck, and then switch to a city, requiring a much larger beam, and much more energy, and just
think of the power required to sustain a beam from outerspace onto the surface of the earth.

