Standard Lemma guide

radiansphere

noun · 1 senses · updated from the 2026-07-25 local source snapshot

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1

noun

Meaning 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.

Definition source: English Wiktionary via Wiktextract

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Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From radian + -sphere.