Definitions for radiation pattern

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Princeton's WordNet

  1. radiation pattern, radiation diagram, pattern(noun)

    graphical representation (in polar or Cartesian coordinates) of the spatial distribution of radiation from an antenna as a function of angle

Freebase

  1. Radiation pattern

    In the field of antenna design the term radiation pattern refers to the directional dependence of the strength of the radio waves from the antenna or other source. Particularly in the fields of fiber optics, lasers, and integrated optics, the term radiation pattern may also be used as a synonym for the near-field pattern or Fresnel pattern. This refers to the positional dependence of the electromagnetic field in the near-field, or Fresnel region of the source. The near-field pattern is most commonly defined over a plane placed in front of the source, or over a cylindrical or spherical surface enclosing it. The far-field pattern of an antenna may be determined experimentally at an antenna range, or alternatively, the near-field pattern may be found using a near-field scanner, and the radiation pattern deduced from it by computation. The far-field radiation pattern can also be calculated from the antenna shape by computer programs such as NEC. Other software, like HFSS can also compute the near field. The far field radiation pattern may be represented graphically as a plot of one of a number of related variables, including; the field strength at a constant radius, the power per unit solid angle and the directive gain. Very often, only the relative amplitude is plotted, normalized either to the amplitude on the antenna boresight, or to the total radiated power. The plotted quantity may be shown on a linear scale, or in dB. The plot is typically represented as a three dimensional graph, or as separate graphs in the vertical plane and horizontal plane. This is often known as a polar diagram.

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"radiation pattern." Definitions.net. STANDS4 LLC, 2014. Web. 25 Oct. 2014. <http://www.definitions.net/definition/radiation pattern>.

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