Pronounced "fraynel zone." The pattern of electromagnetic radiation that is created by a transmitting station from its antenna to receiving antennas. It is in the shape of an ellipsoid ...

Figure D.1: Definition of the first Fresnel zone for the free space path and for the reflected path. The dotted ellipse is for the reflected path Moving on a line perpendicular to the line connecting ...

If you are a Hackaday reader, you probably know what a Fresnel lens is. You find them in everything from overhead projectors to VR headsets. While it seems commonplace now, the Fresnel lens was an ...