Artículo de Friss/Índice/Ecuación 1

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Ecuación 1 ${\frac {P_{r}}{P_{t}}}={\frac {A_{r}A_{t}}{d^{2}\lambda ^{2}}}$ Pt =Energía de alimentación de la antena transmisora en sus terminales de entrada Pr =Potencia disponible en los terminales de salida de la antena receptora Ar =Área efectiva de la antena receptora At =Área efectiva de la antena transmisora d =Distancia entre las antenas $\lambda$ =Longitud de onda

Equation 1 This note emphasizes the utility of the following simple transmission formula for a radio circuit made up of a transmitting antenna and a receiving antenna in free space: ${\frac {P_{r}}{P_{t}}}={\frac {A_{r}A_{t}}{d^{2}\lambda ^{2}}}$ where Pt= power fed into the transmitting antenna at its input terminals. Pr=power available at the output terminals of the receiving antenna. Ar=effective area of the receiving antenna. At=effective area of the transmitting antenna d=distance between antennas. $\lambda$= wavelength The effective areas appearing in (1) are discussed in the next section and this is followed by a derivation of the formula and a discussion of its limitations.