I have a 2.4Ghz single band router. technicolor I am planning on purchasing a new dual band router. Since my family is clogging my internet connection traffic with movies and series i am planning on purchasing a new dual band router and broadcast two different networks. I would let them connect to the 2.4 Ghz band and i connect myself alone to the 5 Ghz band. Does this solve my problem ? i want to get rid from this clogging problem and i don't want anyone to interfere or slow my internet connection.
I'm pretty sure this is not going to solve your problem.
The 2.4 Ghz and 5Ghz are for wifi, and yes they are separate. This is the connection from your local device to the router. The connection from the router to the internet remains unchanged no matter what you do. If your internet speed is not capable of sustaining all your devices, it doesn't matter if you go through 5Ghz or not, and the bottleneck is not your wifi, but the internet itself.
That said, 2.4Ghz is a slow network, and 5Ghz is a fast network. You may see some improvements in speeds, but if clogging really is the problem, it will not be the answer to switch to 5Ghz.
If they're saturating LAN, it will help. If they're saturating your Internet connection (more likely), it won't help. Wi-Fi is used only between your router and connected devices and its throughput is usually way higher than Internet connection speed.
5 GHz band doesn't give you extra Internet bandwidth, it gives you extra router bandwidth.
Yes, the 2.4 gig and 5 gig band are separate, and your proposal feasible.
Note that it may not be your family saturating the 2.4 gig band (but this is possible), it could be interference from neighbours. If your family is torrenting make sure your new router can handle the connection tracking requirements. You may also want to look into QoS as its possible the bottleneck is/will become your Internet connection - especially the upload if you are using an adymetric connection like VDSL.