ETS-Lindgren 3161 Octave Horn Antenna - Manual (Page 30)

30 | Radiated Emissions Measurements
The magnetic flux density B in (T) is related to the magnetic field
strength H in (A/m) by the permeability of the medium in (H/m). For
free space, the permeability is
µ
o
= 4 π .10
-7
H/m. Converting from (T)
to (pT) and from (A/m) to ( µ A/m) and taking the log, the constant
becomes:
240 120 20 4 10 2 0
10
7 − + × = − log ( ) . π
dB(mW/m 2 ) = dB(W/m 2 ) + 30.0
dB(W/m 2 ) = 10 log (V/m
•
A/m)
dB(pT) = dB( μA/m) + 2.0
A/m = 10
dB ( A/m)-120 μ
20
E QUATION 6
E QUATION 7
E QUATION 8
E QUATION 9