英和和英

別の表記

• near-field

名詞

near field (plural near fields)

1. (acoustics) The region within a distance a fraction of a wavelength from a sound source. Accordingly, the outer boundary of the near-field region is closer for high-pitched sound than for low-pitched sound.
2. (electronics, communication) The region within about half a wavelength from an electrically small antenna. More specifically it is the region within the radiansphere.

   Antonym: far field

派生語

• near field communication

参照

引用

• For quotations using this term, see Citations:near-field.

形容詞

near-field (not comparable)

1. In loudspeaker acoustics, referring to a region where the intensity of direct, unreflected sound from the source (such as a loudspeaker) is significantly dominant over any indirect or reflected sound.

   Antonym: far-field

使用する際の注意点

• The term has related, but not identical, meanings in various disciplines involving wave behavior, particularly electromagnetic antennae and acoustics. In general it refers to differences between wave phenomena in regions close to the source, and in regions far from the source. Such differences are of profound importance in various fields of biology, technology, and fundamental research.

参照