I've got b/g/n router and b/g laptop. It connects to the router using G. I'm not aware of N-routers that are not compartible with B/G. Still, you need to configure router properly to accept all b/g/n. I also got the dongle to have better speed but still it is compartible with b/g. that should be your home PC config issue. n900 has no N. Most likely you didn't need the dongle. so I have one laptop, two cells and printer connecting using g and another laptop using N at the same time. The router is prety cheap - dlink DIR-655