Information Technology Reference
In-Depth Information
R
=
R
o
.
1
R
dU
o
(
R
)
dR
C
o
=
Substituting (5.14) into (5.12), we get
E
x
E
y
E
z
=
C
o
(
y
−
y
o
)
(
z
)
Z
N
(
z
)
,
=−
C
o
(
x
−
x
o
)
(
z
)
Z
N
(
z
)
,
=
0
,
C
o
H
x
H
y
H
z
=
C
o
(
x
−
x
o
)
(
z
)
,
=
C
o
(
y
−
y
o
)
(
z
)
,
=−
o
(
z
)
Z
N
(
z
)
.
i
.
(5
15)
It is evident that the normal field defined by (5.15) can be considered as a field
of remote magnetic dipole located at the centre O of the source domain I. This field
is the superposition of three independent modes.
Determine the normal magnetic field at the origin of coordinates (at the centre
M
o
of the observation domain S. In virtue of (5.15)
H
x
(
x
H
x
o
,
=
0
,
y
=
0
,
z
=
0)
=−
C
o
x
o
=
H
y
(
x
H
y
o
,
=
0
,
y
=
0
,
z
=
0)
=−
C
o
y
o
=
.
(5
16)
C
o
H
z
(
x
=
0
,
y
=
0
,
z
=
0)
=−
o
Z
N
(0)
=
H
z
o
.
i
Plugging (5.16) into (5.15), we get
i
o
y
(
z
)
Z
N
(
z
)
Z
N
(0)
E
x
H
y
o
H
z
o
=
(
z
)
Z
N
(
z
)
−
,
i
o
x
(
z
)
Z
N
(
z
)
Z
N
(0)
E
y
H
x
o
H
z
o
=−
(
z
)
Z
N
(
z
)
+
,
E
z
=
0
.
and
i
o
x
(
z
)
Z
N
(0)
i
o
y
(
z
)
Z
N
(0)
H
x
H
x
o
H
z
o
H
y
H
y
o
H
z
o
=
(
z
)
−
,
=
(
z
)
−
,
(
z
)
Z
N
(
z
)
H
z
H
z
o
=
Z
N
(0)
.
Grouping the field components that have the same factor
H
x
o
,
H
z
o
, we obtain
three independent modes: two plane-wave modes with polarization in the orthogonal
directions:
H
y
o
,
