Friis Transmission Equation:
\( P_r = P_t G_t G_r \left(\frac{\lambda}{4\pi d}\right)^2 \)
Where:
\( P_r \) = Receiver power (W)
\( P_t \) = Transmitter power (W)
\( G_t \) = Tx antenna gain (linear)
\( G_r \) = Rx antenna gain (linear)
\( \lambda \) = Wavelength (m)
\( d \) = Distance (m)
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