Researchers developed a model showing the ability of reconfigurable intelligent surfaces to redirect the propagation of radio waves, which could improve the signal. A method to analytically express ...

A large number of things—some desirable, some not—can happen to a radio wave on its way from one place to another. In the simplest case two antennas (a transmitter and a receiver) are located so that ...

At night, you can listen to AM radio from stations on the other side of the country. To find out why, we need to look high into the atmosphere. Not all radio waves travel farther at night than during ...