That's not an EMP weapon, it's an RFI generator.
Basically, the principle is that you generate a strong enough radio signal to induce current in nearby wires. If those wires happen to be attached to an electrically triggered detonator, you get a "prematurely detonated" Palestinian.
The same sort of thing happens whenever an F-16 flew too close to a radio tower in Europe - the induced currents and RFI interference shuts down the computerized fly-by-wire system and causes the servos to get weird inputs.
Real EMP weapons *start* at about the size of a Uhaul truck and are *very* obvious.
Just defending my raving nutter speculations. No offense intended! :-)