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Antenna Measurement Chapter - Diamond Engineering
www.diamondeng.netPractical Antennas 2 Where: Pr = Received power level Pt = Transmit power level = Transmit wave length Gt = Gain of the transmit antenna Gr = Gain of the transmit antenna Gr = Gain of the receive antenna d = Separation distance between antennas It is convenient to express Friis formula in terms of S212 = Pr /Pt and dB: dB r dB t dB S21dB PL G G (1.2)