Loading...
Publication
Projecto de uma antena para comunicação Wireless do ROVIM
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 4.84 MB | Adobe PDF |
Authors
Abstract(s)
A evolução tecnológica leva ao aparecimento de novos meios e novas realidades, revolucionando por completo o mundo. O Exército Português também acompanha esta evolução e adquiriu recentemente vários robôs para serem utilizados na vigilância do teatro de operações.
Esta dissertação tem como objectivo dimensionar e construir um protótipo de uma antena que visa fazer a comunicação ,sem fios (wireless) entre o operador e o robô usado na vigilância. Este protótipo tem de permitir ao operador alternar entre várias larguras do lobo principal (-3 dB) e ao mesmo tempo vários ganhos.
Nesta dissertação foi projetctada, simulada, construída e testada uma antena usando a técnica dos algoritmos genéticos, que permite alterar a largura do lobo principal (-3 dB) e ao mesmo tempo operar com um determinado ganho para essa largura de feixe, sendo assim possível passar de um lobo “estreito” para um mais “largo”.
Inicialmente a antena foi dimensionada e simulada no programa de simulação CST MWS, para operar na banda dos 2,4 GHz. Após ter sido construída, a antena foi testada na câmara anecóica e foi verificado se os diagramas de radiação e o coeficiente de onda estacionária correspondiam aos que tinham sido simulados no CST MWS. Estes dados permitem concluir que os diagramas de radiação e o coeficiente de onda estacionária simulados e medidos são muito próximos, sendo que os valores medidos são sempre melhores que os simulados.
Technological progress leads to the appearance of new means and new realities, changing the existing paradigm. . The Portuguese Army also accompanies this development and has recently acquired several robots to be used for surveillance in warfare operations.. This master's thesis aims at designing, build and test a prototype antenna for wireless communication between the operator and the robot used for surveillance. This prototype has to allow the operator to deal with different Half Power Beamwidths and various gains.n The antenna designed and built allows to change the width of the radiation beam, and power gain, thus allowing the operator to use a narrower or wider beam.. Initially the antenna was designed using Genetic Algorithms and simulated using the simulation program CST MWS, to operate in the 2.4 GHz band. The prototype constructed, was tested in an anechoic chamber. A comparison between simulated and experimental results show that the radiation diagrams and the standing wave ratio (SWR) show a good agreement with the results of simulation using the CST MWS software. These data allow us to conclude that the objectives of this thesis were fulfilled and a prototype antenna has a better performance than the simulated one.
Technological progress leads to the appearance of new means and new realities, changing the existing paradigm. . The Portuguese Army also accompanies this development and has recently acquired several robots to be used for surveillance in warfare operations.. This master's thesis aims at designing, build and test a prototype antenna for wireless communication between the operator and the robot used for surveillance. This prototype has to allow the operator to deal with different Half Power Beamwidths and various gains.n The antenna designed and built allows to change the width of the radiation beam, and power gain, thus allowing the operator to use a narrower or wider beam.. Initially the antenna was designed using Genetic Algorithms and simulated using the simulation program CST MWS, to operate in the 2.4 GHz band. The prototype constructed, was tested in an anechoic chamber. A comparison between simulated and experimental results show that the radiation diagrams and the standing wave ratio (SWR) show a good agreement with the results of simulation using the CST MWS software. These data allow us to conclude that the objectives of this thesis were fulfilled and a prototype antenna has a better performance than the simulated one.
Description
Keywords
Antena Yagi-Uda com HPBW variável Algoritmo Genéticos Balun Diagramas de Radiação