Radio Wave Propagation
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Radio-Wave Propagation Model for UHF Band in Different Climatic Conditions with Dyadic Green’s Function
AbstractThis article proposes a deterministic radio propagation model using dyadic Green's function to predict the value of the electric field. Dyadic is offered as an efficient mathematical tool which has symbolic simplicity and robustness, as well as taking account of the anisotropy of the medium. The proposed model is an important contribution for the UHF
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-06
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2. ANN model of RF MEMS Lateral SPDT switches for millimeter wave applications
This paper presents Artificial Neural Network (ANN) implementation for the Radio Frequency (RF) and Mechanical modeling of lateral RF Micro Electro Mechanical System (MEMS) series micro machined Single pole double through (SPDT) switch. We propose an efficient approach based on ANN for analyzing the losses in ON and OFF state of lateral RF MEMS series switch
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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3. Predição da intensidade do campo elétrico da onda de superfície utilizando redes neurais artificiais
The purpose of the current work is to create a neural network simulator capable of predicting the electric field intensity of a surface wave, from some physical characteristics of the propagation environment. For the network training, it was used data collected on the central region of Brazil, near the Brasília city, consisting of an AM radio signal transmi
Publicado em: 2008
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4. Caracterização experimental da rádio-propagação no interior de edifícios. / Experimental characterization of the indoor radio propagation.
A caracterização de um canal de rádio é de suma importância para garantir a comunicação entre dois ou mais pontos, principalmente quando o canal é um ambiente repleto de obstáculos, como é o caso dos ambientes de multipercurso encontrados no interior de edifícios. Por conseguinte, neste trabalho, é apresentada uma caracterização experimental de
Publicado em: 2008
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5. EFEITOS DE DIFERENTES REGIÕES URBANAS NA PROPAGAÇÃO DE SINAIS DE SISTEMAS DE COMUNICAÇÕES PESSOAIS BASEADOS EM REDES DE SATÉLITES NÃO GEOESTACIONÁRIOS / EFFECTS OF DIFFERENT URBAN ENVIRONMENTS ON THE PROPAGATION OF SIGNALS FROM PERSONAL COM. SYSTEMS BASED ON NON GEOSTATIONARY ORBIT SATELLITE NETWORKS
As land-mobile satellite systems and radio-determination systems get more importance in the global telecommunications scenario, it becomes even more necessary to understand the radio-propagation environment: its behavior and the inter-relationship between its several aspects and physical parameters. Due to the communications devices characteristics used in t
Publicado em: 2005
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6. ANALYSIS OF THE CLASSICAL THEORIES OF PROPAGATION IN THE PRESENCE OF THE EARTH / ANÁLISE DAS TEORIAS CLÁSSICAS DE PROPAGAÇÃO DAS ONDAS RADIOELÉTRICAS EM PRESENÇA DA TERRA
In view of the mathematical complexity, the rigorous solutions of the classical theories of radio wave propagation in the presence of the earth are not directly applied to practical problems. Hence, based on these rigorous solutions, approximate expressions are developed to simplify the eveluation of radio wave signal attenuation. However, due to assumptions
Publicado em: 1966