Source: wikibot/free-space-path-loss
= Free-space path loss
{wiki=Free-space_path_loss}
Free-space path loss (FSPL) is a measure of the attenuation of an electromagnetic signal as it propagates through free space. It quantifies how much signal power is lost over a distance in an ideal, unobstructed environment where there are no physical obstructions, atmospheric effects, or multipath interference.