Near field
Encyclopedia
Near field may refer to:
- Near-field (mathematics)Near-field (mathematics)In mathematics, a near-field is an algebraic structure similar to a division ring, except that it has only one of the two distributive laws. Alternatively, a near-field is a near-ring in which there is a multiplicative identity, and every non-zero element has a multiplicative inverse.- Definition...
, an algebraic structure - Near and far fieldNear and far fieldThe near field and 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...
, parts of an electromagnetic field - Near field communicationNear Field CommunicationNear field communication, or NFC, allows for simplified transactions, data exchange, and wireless connections between two devices in proximity to each other, usually by no more than a few centimeters. It is expected to become a widely used system for making payments by smartphone in the United States...
, a set of short-range wireless technologies, typically requiring a distance of 4 cm or less - Near field (acoustics), the region of space within a distance a fraction of a wavelength from a sound source