This paper calculates the propagation loss in mixed-path mobile communication using parabolic equation method. The implicit finite differences scheme of the Crank-Nicolson type is applied in order to get the solution of the parabolic equation. The propagation is considered in 15 0 in the direction paraxial and the complex refractive index was considered what increases its precision. To validate the method, a radio propagation measurement campaign was carried out, in the county of Benfica, near the city of Belém, State of Pará. The frequency used was 900 MHz. The results were compared to the simulations made with the proposed method, which presented the best performance comparing to others works in literature. The loss predicted by this method had a mean error of 3.40 dB and standard deviation of 2.75 dB in relation to the measured data.

-This paper presents a model for propagation loss prediction in indoor mobile communications using parabolic wave equation (PE). The implicit finite differences scheme of the Crank-Nicolson type is applied in order to get the solution of the parabolic equation. The propagation is considered in 15 0 in the direction paraxial. To validate this model, a measurement campaign was accomplished at a typical five floor building of a university using a frequency of 850 MHz. The loss predicted by this model had a mean error of 4.69 dB and standard deviation of 3.85 dB in relation to the measured data.

A model to predict the propagation path loss through the urban foliated semi-confined environment using parabolic equations (PE)

This article compares slow fading component of the propagation loss calculated through parabolic wave equation and some models of the literature with results obtained during measurement campaign, in indoor environment. The frequency used was 850 MHz; a complex refractive index was considered. The implicit finite difference scheme of the Crank-Nicolson type was applied in order to get the solution of the parabolic equation. The propagation was considered in 15°with direction paraxial. ABSTRACT: A very-low-profile (VLP) broadband planar antenna is developed for DCS-1800 and IMT-2000 handsets. The VLP planar antenna consists of an S-strip and a T-strip, which are separately printed on the two sides of a thin substrate. The antenna height is only 4.8 mm which is much lower than previously published antenna configurations. The VLP planar antenna can achieve a bandwidth of ϳ30% for return loss Ͻ -10 dB.

Brasil Resumo     Neste trabalho é calculada a perda de propagação em um ambiente misto (floresta, ruas e edificações) utilizando-se o método de equações parabólicas com a adição de uma variável aleatória, o que torna o modelo híbrido. Para a resolução da equação parabólica é utilizado o esquema implícito de diferenças finitas de Crank-Nicolson. São considerados a propagação para 15° na direção paraxial e para os parâmetros eletromagnéticos dos meios, o índice de refração complexo. Com o objetivo de validar o modelo proposto, foi feita uma campanha de medições em dois municípios do Estado do Pará, na cidade de Marituba na freqüência de 900 MHz e na cidade de Barcarena em 1800 MHz. O modelo proposto foi então comparado aos dados experimentais. O erro encontrado foi de 2,28 dB e o desvio padrão foi 3,38 dB. Os resultados obtidos mostram a eficiência do método.