Word.ws English Dictionary

radiansphere

radiansphere noun: a spherical region of radius λ/2π around a small dipole electromagnetic antenna. This is the distance at which the induction and radiation terms are equal in magnitude. Inside, the induction terms dominate. In radio antenna theory the radiansphere is a convenient definition for the boundary between near-field and far-field regions.

Noun

radiansphere (plural radianspheres)

  1. A spherical region of radius λ/2π around a small dipole electromagnetic antenna. This is the distance at which the induction and radiation terms are equal in magnitude. Inside, the induction terms dominate. In radio antenna theory the radiansphere is a convenient definition for the boundary between near-field and far-field regions.
    • "The "radiansphere" is the boundary between the near field and the far field of a small antenna. Its radius is one radianlength (λ/2π), at which distance the three terms of the field are equal in magnitude. A "small" antenna is one somewhat smaller than the radiansphere, but it has a "sphere of...1959 August, Harold Alden Wheeler, “The Radiansphere around a Small Antenna”, in Proceedings of the IRE, volume 47, number 8, page 1325

Forms of radiansphere

pluralradianspheres

Origin of radiansphere

From radian + -sphere.

Questions about radiansphere

What does radiansphere mean?
Radiansphere means a spherical region of radius λ/2π around a small dipole electromagnetic antenna. This is the distance at which the induction and radiation terms are equal in magnitude. Inside, the induction terms dominate. In radio antenna theory the radiansphere is a convenient definition for the boundary between near-field and far-field regions.
What part of speech is radiansphere?
Radiansphere is a noun.
What is the plural of radiansphere?
The plural of radiansphere is radianspheres.

Words near radiansphere in the dictionary

  1. radiance field
  2. radiances
  3. radiancies
  4. radiancy
  5. radians
  6. radiansphere
  7. radianspheres
  8. radiant
  9. radiant energies
  10. radiant energy
  11. radiant heat

Source and license

Adapted from Wiktionary: radiansphere (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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