Received power in free space propagation model

An example of how to calculate and plot received power in free space model using Friis free space equation

This is a simple code based on a textbook example

In wireless communication, the free space propagation model is used to calculate the Received Power if there is an unobstructed line-of-sight between the transmitter and the receiver. This model is viable as long as the Transmitter-Receiver separation distance is greater than the far-field (Fraunhofer) distance.

This code utilized Friis free space equation to calculate received power over some distance in Watts, as well as to find received power at the close-in distance to then use it as a reference and calculate received power in terms of dBm and dBw. Another way to express power attenuation is by calculating Path Loss.

Variables needed for the Friis equations are the transmitter power, transmitter and receiver antenna gain, carrier frequency or wavelength, system losses, T-R separation distance, and close-in distance for dBm and dBW.

The received power and path loss were then plotted as a function of distance.