Back to our radio signal. The electrons in our wire are moving, but not in one direction. These electrons are moving back and forth. Actually, the wave displayed in the activity is a ...

OK. So we have a signal that is sent to a radiosmitter's antenna. How does that signal get from the antenna to the air? Let's first take a look at the signal. The signal is an electic current ...

A team of engineers led by researchers from the University of Glasgow have developed an ultrathin 2D surface that harnesses the ... to manipulate and convert radio waves across the frequencies ...