antena log-periódica koch fractal
DESCRIPTION
This is my final paper. Enjoy and celebrate the whole knowledge.TRANSCRIPT
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LOG-PERIÓDICA KOCH FRACTAL
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• Atualmente o arranjo log-periódico de dipolos é muito utilizado
nas mais diversas aplicações. Constituídos de dipolos com sua
geometria Euclidiana. Contudo existe um outro tipo de
geometria, chamada Fractal.
• Estudos no ramo de antenas comprovaram a eficácia na
utilização desta geometria, tal como redução de tamanho e
acoplamento mútuo .
• O trabalho para conclusão do curso proposto, visa utilizar esse
tipo de geometria num arranjo log-periódico de dipolos.
• Tal projeto será simulado por meio de um software livre,
chamado 4NEC2, que utiliza o método dos momentos.
• Também será confeccionada e por fim testada para aferição dos
resultados.
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• Demonstrar o que são fractais
• Apresentar o desenvolvimento e a construção
de uma LPDA.
• Simulações utilizando o software 4NEC2
(MoM) da LPFKA
• Confecção da LPFKA
• Resultados experimentais
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• Nome originalmente dado por Mandelbrot em
seu livro ”The Fractal Geometry of Nature
(1977) “
• Fractais são formas geométricas
fragmentadas que podem ser subdividas em
partes, onde cada parte é uma copia
reduzida da parte original.
• Podem possuir três características:
• Auto-semelhança
• Complexibilidade
• Dimensão
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Fonte: Wikipedia
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Fonte:Wikipedia
Paradoxo de Zano
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aFonte: Master Thesis, Gianvittorio, J. P.
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Monopolo de Sierpisnki estilo bow-tie: tamanho pequeno, alto ganho e multi-banda
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ELEMENTO COMPRIMENTO(m)
DIÂMETRO(mm)
DISTÂNCIA(mm)
1 0,263 1,754 75,263
2 0,211 1,404 60,211
3 0,168 1,123 48,168
4 0,135 0,898 38,535
5 0,108 0,719 30,828
6 0,086 0,460 -
PARÂMETRO VALOR UNIDADE
τ 0.8 -
σ 0.143 -
570 MHz
700 MHz
B 1,23 MHz
1,98 MHz
2.44 MHz
Rin 75 Ω
G 6,8 dB
N 5+1 -
h/a 75 -
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0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
469.5 544.5 619.5 694.5 769.5 844.5
|Γ|
Frequencias (MHz)
Coeficiente de reflexão
0
10
20
30
40
50
60
70
80
90
100
469.5 544.5 619.5 694.5 769.5 844.5
Zin ( Real) Ω
Frequências (MHz)
Impêdancia de entrada
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-30
-25
-20
-15
-10
-5
0
469.6 519.6 569.6 619.6 669.6 719.6 769.6 819.6
Inte
nsid
ad
e d
o s
inal
(dB
m)
Frequência (Mhz)
Intensidade do sinal x Frequência
Intensidade do sinal
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Obrigado !