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Chapter 2: Radio Wave Propagation Fundamentals
www.ihe.kit.edu13 Institute of Radio Frequency Engineering and Electronics Snell’sLaw of Reflection 12.11.2018 Chapter 2: Radio Wave Propagation Fundamentals 1 2 i r t surface large compared to the wave length smooth surface (otherwise scattering) three angles: - incidence - reflection - transmission / refraction *full derivation in Arthur Schuster: “An Introduction to the Theory of Optics”
1.1 1.2 Antenna Measurements
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)