Browsing by Author "Richter, J."
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- Analysis of the dRET input parameters under varying wind conditions at 20 GHzPublication . Morgadinho, S.; Caldeirinha, Rafael; Fernandes, Telmo, Telmo Rui Carvalhinho Cunha, Telmo R.; Richter, J.In this paper, the discrete Radiative Energy Transfer (dRET) theory is addressed as a means to the model dynamic effects through vegetation at millimetre-wave frequencies. The proposed approach, suggests the use of the dRET input parameters time-variant properties, to achieve the modelling of time-variant effects. Analysis of the input parameters time-variability, and its effect on the directional spectra is performed, in order to assess the feasibility of the proposed model approach.
- On the applicability of the dRET model to the trunk layerPublication . Fernandes, T.; Leonor, N.; Caldeirinha, R.; Richter, J.; Al-Nuaimi, M.This paper presents a method to model the scattered signal from a regular formation of cylinders, both dielectric and metallic, at micro and millimeter wave frequencies. The model, aims to predict the signal emanated inside and around an isolated block of tree trunks, and might be used as part of a larger algorithm intended to model isolated volumes of vegetation. The method presented here, is based on the prior knowledge of the re-radiation function of cylinders and used the dRET (discrete Radiative Energy Transfer) model, to gather the interactions between the trunks present in the formation to predict the directional profile of the received signal power level at various location inside the formation. The re-radiation function from cylinders, is predicted based on a model previously applied to lamp posts, and is assessed by comparison with measurements performed at 18 and 36 GHz. These functions are subsequently used to input the dRET model whose predictions were also assessed with measurements obtained inside an anechoic chamber, using the same spot frequencies.