Is there any USB adapter that you can plug in your PC and will convert the USB output in wireless and then have a second USB adapter that will receive the wireless signal and reconvert it to USB input?
The second USB adapter would preferably have to be relatively small.
UPDATE:
What I'm really trying to do is: a really long USB cable, but without the cable; in other words, "wireless USB". I'm trying to connect a robot that I built and that has a USB port.
Of course, I could add a wireless interface but it'd be long and complicated... that's why I came up with this idea. USB hubs aren't really an option since the said robot has to move around.