What is the purpose of Friis transmission equation [ (LdB) = 20 log(d) + 20...

The Friis transmission equation is used to calculate the free-space path loss (FSPL) between two antennas.It considers the distance (d) between the antennas and the frequency (f) of the transmitted signal.This equation is fundamental in wireless design to estimate the loss of signal strength over a line-of-sight path, aiding in link budget calculations and ensuring reliable communication.