Friis Path Loss Calculator

This calculator computes the power that a receiving antenna receives for a given transmitting antenna for a given power for a distance greater than one wavelength for line of sight transmission. The greater the frequency the greater the path loss.

Input:
Ptx	(dB)
lambda (wavelength), OR f (frequency)	(m) OR (MHz)
d (Distance)	(m)
Gtx	(dB)
Grx	(dB)
Prx	(dB)

Equations:

Prx= Ptx*Gtx*Grx*( (lambda)/(4*PI*d) )^2

OR in dB

Prx= Ptx(dB)+ Gtx(dB)+ Grx(dB) - 20log(4*PI*d/lambda);

The last term is the path loss.