Attenuation Through Vegetation

Figure 1.22 gives attenuation data on microwave ray beams passing through woodland. The curves represent an approximate average for all types of woodland for frequencies up to about 3 GHz. When the attenuation inside such woodland becomes large (i.e., > 30 dB), the possibility of diffraction or surface modes has to be considered (Ref. 14).

Frequency (MHz)

Figure 1.22. Specific attenuation of woodland. A = vertical polarization; B = horizontal polarization. (From Figure 1, p. 171, CCIR Rec. 833, RPN Series, CCIR 1992; Ref. 14.)

Frequency (MHz)

Figure 1.22. Specific attenuation of woodland. A = vertical polarization; B = horizontal polarization. (From Figure 1, p. 171, CCIR Rec. 833, RPN Series, CCIR 1992; Ref. 14.)

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