How to convert dBm to W/m²?
The formula to convert dBm to W/m² is:
S [W/m²] = (10^(p[dBm]-G[dBi]) / 1000) * ((4 * Pi) / (Lambda[m]²))
G = Antennagain
Lambda = Wavelength
Pi = 3,1415
Say your have a reading of -40dBm at 950MHz with a HyperLOG 7025 antenna (which offers a gain of 4,9dBi at 950MHz). The result is:
0,000.004.08W/m² or 4,08µW/m²
I am Javier. I am interested on citing the source of this formula (page 63 of manual) in an article and would like to ask if you know a solid reference to use. Also I would appreciate if you could share a mistaken formula and its reliable source to convert dBm to W/square meter where frequency is not considered.
I would appreciate your valuable feedback
This are the international physical ISO standards used by most of the world. The US simply do it "wrong".
Have a look at https://en.wikipedia.org/wiki/Decimal_mark