●●● To conclude -3 V=C e-jkoRd 1-e 2jkohihz/a ●●●● ●●0 ●●● §4.5 Propagation Rd ● ●● kohih2 2kohih2 Direct Ra R = 2sin 兰 Transmit Rectie d d antenna G.P: koh h/d <0.3rad anle G... IV2 PtGtGrhihz P= Zo Ra 1 100 40 Attenuation In practice Pr Rn n=1.5to6 10 (wx/8P) 0.4 0.2 -20Fading Small-scale 0.1 H,O -30 variation (fading) 0.04 01 0.02 0.01 0.004 9150m altitude 元，A个； 0.002 -50 0.00 10 5 202530 403060708090100150200250300400 Large-scale Frequency (GHz) -60 variation (average) 2040 12 14 16 18 20 22 24 Distance(m) 12To conclude - 3 §4.5 Propagation In practice Attenuation n=1.5 to 6 Fading 12