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A discrete RET Model for Millimeter-Wave Propagation through Vegetation

Leonor, N. ; Caldeirinha, Rafael ; Fernandes, T. ; Richter, J. ; AL-Nuaimi, M.

IEEE Transactions on Antennas and Propagation Vol. 66, Nº 04, pp. 1985 - 1998, April, 2018.

ISSN (print): 0018-926X
ISSN (online): 0018-926X

Journal Impact Factor: 2,181 (in 2014)

Digital Object Identifier: 10.1109/TAP.2018.2806393

Abstract
A modified discrete Radiative Energy Transfer (dRET) model has been developed envisaging to overcome some of the limitations found in the original dRET formulation, namely in terms of angular resolution, oblique and non-uniform incidence and antenna patterns. Additionally, the discretized squared nature of dRET model can lead to a some amount of stair case error. Hence, this paper also proposes an input parameter scaling model, enabling the characterization of tree cells with reduced size. The performance of the modified dRET model is assessed not only against the current ITU-R P.833-8 recommendation for propagation in vegetation, but also against directional spectra measurements conducted in an outdoor inhomogeneous forest at 20 and 62.4 GHz