Manual SPECTRAN V5
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38
PHYSICAL UNITS
Inside the close-up range, E and H fields would need to be measured sepa
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rately. However, outside the close-up range, both field types are coupled tight
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ly to each other, so knowing the strength of one of them will be enough to
derive the other.
7.5. Calculating power density [W/m²] from power [dBm]
Only if you know the transmitter’s frequency you can convert from dBm to
W/m². You will also need the antenna gain of the antenna used for measure
-
ment. The formula you need looks like this:
