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sci.Friis-transmission-link Calculator
Calculates free-space received power from transmit power, antenna gains, and path loss using the Friis transmission equation. Free-space path loss at 2.4 GHz over 100 m is 80 dB — doubling frequency adds 6 dB path loss; doubling distance adds another 6 dB.
Inputs
Pt Dbm
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Gt Dbi
Reference formula or conversion factor shown for context.
Gr Dbi
Reference formula or conversion factor shown for context.
F Ghz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
D M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Results
received power Pr (dBm)
Reference formula or conversion factor shown for context.
free-space path loss FSPL (dB)
The decrease or degradation from the baseline.
wavelength λ (cm)
The computed linear length.
received power (μW)
Reference formula or conversion factor shown for context.
Friis: Pr = Pt + Gt + Gr − FSPL
Reference formula or conversion factor shown for context.