 Hi everyone, I'm Sophie from Aravillaments and today I will talk about near field and far field. As you may know, antenna near field and far field are two distinct regions around an antenna where the antenna's radiation properties differ significantly. The near field can be further divided into reactive near field and radiative near field. Now let's start with the region that's interest as the most, the far field region. Also known as the radiation field or the front hofer region, it is the region far away from the antenna where the electromagnetic waves have fully developed and exhibit a simple predictable behavior. They propagate as planar waves with the electric and magnetic fields perpendicular to each other. The far field region is defined by the wavelength of the signal and the size of the antenna. Two times the square divided by lambda is then the exact formula for all uniters out there. But generally speaking, the far field region of a 30 degree hot antenna operating at 5.5 gigahertz started 2 meters and extends to infinity. For 24 dbi gained if it's 6 meters and for 20 dbi pejorated sector, this distance is over 20 meters. On the other side, closest to the antenna, we have the reactive near field region. This is a place of electromagnetic chaos. Any object inside this region cause unpredictable changes to the antennas radiation diagrams and vswr, because it becomes a part of the antenna itself. The equation is also more complex. For a 30 degree horn like mentioned before, this comes out to be only 0.3 meters from the antenna aperture. For 24 dbi gained if it's 0.7 meters and for 20 dbi pejorated sector, this extends to almost 2 meters. Maintaining a reactive near field free of obstacles is much simpler with antennas with small form factors, enabling much denser collocation. Finally, the radiative near field is the region in the middle. The EM fields have not yet consolidated into the far field structure, but anything placed in this region is far enough not to have a direct influence on the antenna's performance. If you find this video useful, give us a like or share. To learn more, don't forget to hit the subscribe button to get notifications about new topics. See you in the next video.