Near and Far Field (Paperback)

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The near field (or near-field) and far field (or far-field) and the transition zone are regions of the electromagnetic radiation field that emanates from a transmitting antenna, or as a result of radiation scattering off an object. Certain behavior characteristics of electromagnetic fields dominate at a given distance from the antenna or scattering object, while different behavior can dominate at another distance. Defined boundary regions categorize these behavior characteristics. The regional boundaries are measured in terms of a ratio of the distance from the radiating source to the wavelength of the radiation. The "far-field," which extends from about two wavelengths distance from the antenna to infinity, is the region in which the field acts as "normal" electromagnetic radiation.