Fresnel Zone - a simple presentation This material was put together to provide details about the Fresnel Zone and to answer the question “Why is the gain of the antenna not taken into consideration in the Fresnel Zone calculations?” The short answer is that the Fresnel Zone calculations will determine what path should be free of obstacles. The path shape changes based on distance and wavelength. The strength of the source is based on energy/watts and antenna gain, which are totally different animals. A Laser was used to prove the physics part of the electromagnetic wave, since light is both a wave and a particle. Most of the pictures are from the internet, and the sites that provided the theory are the following: http://theory.uwinnipeg.ca/mod_tech/node120.html https://en.wikipedia.org/wiki/Gaussian_beam https://en.wikipedia.org/wiki/Rayleigh_length http://zoneplate.lbl.gov/theory The rest is just common sense backed by education and wisdom on loan from God. Chapter ...