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Abstract(s)
Este trabalho trata de um projeto e análise de uma antena log-periódica para recepção de sinal de TV digital operante em Portugal e no Brasil, a qual abrange a faixa de frequências 470 MHz a 758 MHz pertencente ao espectro Ultra High Frequency (UHF). As principais características das antenas, tais como diagrama de radiação, diretividade, ganho, eficiência e taxa de onda estacionaria, voltage standing wave ratio (VSWT), foram apresentadas e analisadas para que assim fosse possível escolher um tipo que tivesse um bom resultado final e que se enquadrava dentro das especificações, a qual a log-periódica foi a escolhida para a montagem. Diferentes softwares também foram analisados para saber qual se adequava às necessidades de modelagem e análise. Assim, seguindo os cálculos teóricos e as particularidades desse tipo de antena, foram calculadas as medidas da geometria da antena, modelada no software de simulação Computer Simulation Technology (CST) e analisados os resultados obtidos. Após as análises teóricas e as simulações, foi montado um protótipo da antena o qual apresentou os resultados esperados validando as técnicas empregadas.
This work deals with the design and analysis of a log-periodic antenna for digital TV signal reception in Portugal and Brazil, which cover the frequency ranges of 470 MHz to 758 MHz, belonging to the Ultra High Frequency (UHF) spectrum. As the main characteristics of the antennas, such as radiation pattern, directivity, gain, efficiency and voltage standing wave ratio (VSWT), many specifications, one of which the log-periodic was chosen for an assembly. Different software has also been analyzed to find out which is most appropriate as modeling and analysis needs. Thus, following the theoretical calculations and antenna type particularities, all measurements of the antenna geometry, modeled on Computer Simulation Technology (CST) simulation software, were calculated and the results obtained were analyzed. After theoretical analysis and simulations, a prototype of the antenna was assembled and this one presented the expected results validating the techniques employed.
This work deals with the design and analysis of a log-periodic antenna for digital TV signal reception in Portugal and Brazil, which cover the frequency ranges of 470 MHz to 758 MHz, belonging to the Ultra High Frequency (UHF) spectrum. As the main characteristics of the antennas, such as radiation pattern, directivity, gain, efficiency and voltage standing wave ratio (VSWT), many specifications, one of which the log-periodic was chosen for an assembly. Different software has also been analyzed to find out which is most appropriate as modeling and analysis needs. Thus, following the theoretical calculations and antenna type particularities, all measurements of the antenna geometry, modeled on Computer Simulation Technology (CST) simulation software, were calculated and the results obtained were analyzed. After theoretical analysis and simulations, a prototype of the antenna was assembled and this one presented the expected results validating the techniques employed.
Description
Keywords
Antena Log-periódica TV Digital Sinal UHF Log-periodic Antenna Digital TV UHF signal