wireless home network

I want to have my laptop connect to my LAN via wireless connection. right now, I have a server connected with rj45 to my 5 port switch, then another cable going to a workstation. Is there any wireless device I can get that will plug into my standard switch port to act as an access point? after that, I’d just put a wireless adapter onto my laptop and roam around the house.

is this possible or do I need an entire 802.11b network?
thx