Your question is simply too broad.
What WiFi protocol(s) does your current router support? It's almost certain that Wireless b & g are supported, depending on when you bought it it's likely Wireless n, but unless it's pretty recent it probably doesn't support Wireless ac.
Then there's the question of single band (usually 2.4Ghz) or dual band capability (2.4 & 5Ghz).
You'd really have to give the make and model of your current router for anyone to accurately advise. In addition, just as much depends on the WiFi cards/adapters in your devices. If, for instance, none are more recent than the Wireless n protocol, and are single channel, you can have the most recent and fastest router on the surface of the earth and that equipment cannot and will not exploit that capability. Wireless networks are, like a chain, only as strong as their weakest links.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story