最終更新日：2024/07/31
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.
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radiansphere
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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.
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.
