When designing an electromagnetic wave transmit/receive system, the power balance is impacted by the transmit power (Pt), the realized gain of the transmit and receive antennas (Grt, Grr) and, of course, the free-space attenuation of the waves, which is proportional to distance (r) and frequency. The theoretical power received between a transmitter and a receiver is thus given by the equation [E 3 280]:
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