- Branche: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
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An electrical connection to earth through an earth-electrode subsystem. 2. In an electrical circuit, a common return path that usually (a) is connected to an earth-electrode subsystem and (b) is extended throughout a facility via a facility ground system consisting of the signal reference subsystem, the fault protection subsystem, and the lightning protection subsystem. 3. In an electrical circuit, a common return path that (a) may not necessarily be connected to earth and (b) is the zero voltage reference level for the equipment or system.
Industry:Telecommunications
An electrical connection using continuous metal-to-metal contact between the members being joined.
Industry:Telecommunications
An electrically conductive surface that serves as the near-field reflection point for an antenna. Note: A ground plane may consist of a natural (e.g., Earth or sea) surface, an artificial surface of opportunity (e.g., the roof of a motor vehicle,) or a specially designed artificial surface (e.g., the disc of a discone antenna. )
Industry:Telecommunications
An electromagnetic pulse produced at an altitude effectively above the sensible atmosphere, i.e., above about 120 km.
Industry:Telecommunications
An electromagnetic wave of a frequency arbitrarily lower than 3000 GHz. Synonym Hertzian wave.
Industry:Telecommunications
An electromagnetic wave of a frequency arbitrarily lower than 3000 GHz. Synonym Hertzian wave.
Industry:Telecommunications
An electromagnetic wave that (a) consists of a series of pulses usually of constant length, amplitude, spacing, and repetition rate when not modulated and (b) usually is used as a subcarrier.
Industry:Telecommunications
An electromagnetic wave that enters a layer of material that is surrounded on both sides by a layer of material of a lesser refractive index such that, if the wave is traveling parallel or nearly parallel to the surfaces of the layers and hence the incident angles with the surfaces are greater than the critical angle, i.e., the angles are grazing with the surface, total internal reflection will occur on both sides and hence trap the wave. Note: Dielectric slabs, optical fibers, and layers of air can serve as an electromagnetic wave trap, thus confining the wave to a given direction of propagation and to a given point.
Industry:Telecommunications
An electromagnetic waveguide (a) that consists solely of dielectric materials, (b) in which the dielectric propagation medium has a rectangular cross section, (c) that has a width, thickness, and refractive indices that determine the operating wavelength and the modes the guide will support beyond the equilibrium length, (d) that may be cladded, protected, distributed, and electronically controllable, and (e) that may be used in various applications, such as in integrated optical circuits (IOCs) in which their shape is geometrically more convenient than the optical fibers that are circular in cross section, that are used in fiber optic cables for long-distance transmission. Note: Their principle of operation is the same as that for optical fibers that are circular in cross section. . Synonym planar waveguide.
Industry:Telecommunications
