There's loads of electronic artists that use 3/4 and other time signatures, but DnB and most other popular electronic genres are strictly 4/4 as far as I know... I could be wrong though, I haven't done music theory in a long time, but you can have swing beats in DnB, which gives it that 3/4 feel.
A lot of IDM uses weird time signatures, check out some Venetian Snares, he uses 11/4 time signatures in some of his songs.