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                          |   VSWR Tools  |   Free Space Loss  |   Power Conversion  |   Antenna Spacing  |  
 

Isotropic losses of free-space radiation

 
Picture showing a transmittin antenna and a receiving one
a_iso = ((4 pi d) / lambda)^2
Frequency:
  f =
Hz
Distance:
  d =
m
Path loss:
  Aiso =
dB

Enter the frequency f and one value (either d or Aiso) and click the "Calculate" button next to it to compute the other one.

These values are only valid for far-field radiation. Antennas have to be perfectly aligned and with the same polarization. The space between the two antennas has to be free.
Only the geometrical loss is considered; absorption in the air or other materials are not taken into account.
 


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