Yes they do exist, but they don't use a radio system for the link.
Google 'free space optics' and 'lightpointe' I've installed plenty of their products with very good results. Though they are well out of the price range of home users
In answer to your question there are a couple of cable routers now that have gigabit switches built in, but it is probably cheaper to buy a stand alone gigabit switch and connect that to any existing devices you have.
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