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A REVIEW OF GROUND IMPEDANCE MODELS FOR PROPAGATION MODELLING

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Fig. 1.- Comparison between predictions of the complex relative surface impedance of a rough  surface (flow resistivity 100 kPa s m-2, porosity 0.4 and tortuosity 2.5, randomly-spaced semi-cylindrical roughness radius 0.04 m, mean spacing  0.16 m) and two
Fig. 3- Normalised impedance data (open circles) obtained from complex excess attenuation  measurements over established grassland

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