IEEE 211-1997 pdf download IEEE Standard DeÞnitions of Terms for Radio Wave Propagation
fade depth: The ratio, usually expressed in decibels, of a reference signal power to the signal power duringa fade.
fade duration: The time interval during which a signal is below a reference value.
fade slope: The time rate of change of the signal power during a fade, expressed in decibels per second
fading: The temporal variation of received signal power caused by changes in the transmission medium orpath(s).
fading range: The ratio of maximum signal to minimum signal during fading, usually expressed in dBOften the fading range is specified over a range of percentages. For example, the 5-95% fading range is theratio of the signal exceeded 5% of the time to that exceeded 95% of the time.
fading rate: The average number of fades occurring per unit time.
Faraday rotation: The rotation of the polarization ellipse of an electromagnetic wave as it propagates in agyrotropic medium such as a plasma in the presence of a finite magnetic field, in a ferrite. or in some dielectric crystals. Note: A gyrotropic material is one in which the permittivity tensor, , or the permeability ten:sor. u is antisymmetric such that E; -Ej or u;i = -U, respectively.
far field region: See: Fraunhoffer region.
fast wave: An electromagnetic wave propagating close to a boundary or within a bounded medium with aphase velocity greater than that of a free wave which would exist in an unbounded medium with the sameelectromagnetic properties. See also: slow wave.
field strength: See: radio field strength
finite diference frequency domain (FDFD): A numerical technique for solving partial differential equations by first Fourier transforming the time variable of the equation from the time domain to the frequencydomain. Then the resultant partial equation is discretized and solved using the finite difference method.
finite difference time domain (FDTD): A numerical technique for solving a partial differential equationinvolving time and space variables. The solution is implemented sequentially in the time domain.
finite element frequency domain (FEFD): A numerical technique for solving partial differential equationsby first Fourier transforming the time variable of the equation to the frequency domain and then using thefinite element method.
finite element time domain (FETD): A numerical technique for solving a partial differential equationdirectly in the time domain. Discretization of the time variable can be accomplished by the finite differencescheme or by the Galerkin method. Note: This method differs from the finite difference time domain(FDTD) method in that the space variable is made discrete by the finite element method rather than the finitedifference method. See also: finite difference time domain
focusing: The concentration of electromagnetic energy into a smaller region of space. See also: defocusing
Foldy’s approximation: The approximate solution for the propagation constant of the mean field in a ran-dom medium based on the scattering properties of a single particle.
Foldy-Twersky theory: See: Foldys approximation
IEEE 211-1997 pdf download
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