English Dictionary

radiansphere

名詞

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.

日本語の意味

小さなダイポール電磁アンテナを中心とし、半径λ/2πの球状領域を指す用語。近接界（誘導項が支配的な領域）と遠方界（放射項が支配的な領域）との境界としても定義される。

The physicist placed a small sensor at the center of the radiansphere to measure field intensity.

物理学者は場の強度を測定するために、半径λの球状領域の中心に小さなセンサーを置いた。

意味（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.

Theradiansphereis 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. Asmallantenna is one somewhat smaller than the radiansphere, but it has asphere of influence" occupying the radiansphere.

radianspheres （ plural ）