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Консультация № 194771
22.02.2019, 20:03
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
1.На сколько децибел S ослабляется электромагнитное излучение частоты f=1 МГц на границе воздуха с медным листом. Принять проводимость меди σ=5.8·107 См/м. (См=1/Ом).
1.На сколько децибел S ослабляется электромагнитное излучение частоты f=1 МГц на границе воздуха с медным листом. Принять проводимость меди σ=5.8·107 См/м. (См=1/Ом).
Обсуждение
27.02.2019, 13:44
общий
это ответ
Здравствуйте, dar777!
Ослабление электромагнитного излучения с частотой f при переходе из среды с диэлектрической проницаемостью [$949$] и магнитной проницаемостью [$956$] в проводящую среду с проводимостью [$963$] характеризуется коэффициентом прохождения по амплитуде:
где
и
- волновое сопротивление диэлектрика и проводящей среды соответственно. Следовательно,
где [$949$][sub]0[/sub] = 8.8542[$183$]10[sup]-12[/sup] Ф/м - электрическая постоянная.
Ослаблению электромагнитного излучения в 10, 100, 1000,... раз соответствует уменьшение на 10, 20, 30 децибел, то есть
В данном случае [$963$] = 5.8[$183$]10[sup]7[/sup] См/м, f = 10[sup]6[/sup] Гц, для воздуха можно приближённо считать [$949$] = [$956$] = 1, и ослабление составит
децибел.
Ослабление электромагнитного излучения с частотой f при переходе из среды с диэлектрической проницаемостью [$949$] и магнитной проницаемостью [$956$] в проводящую среду с проводимостью [$963$] характеризуется коэффициентом прохождения по амплитуде:
где
и
- волновое сопротивление диэлектрика и проводящей среды соответственно. Следовательно,
где [$949$][sub]0[/sub] = 8.8542[$183$]10[sup]-12[/sup] Ф/м - электрическая постоянная.
Ослаблению электромагнитного излучения в 10, 100, 1000,... раз соответствует уменьшение на 10, 20, 30 децибел, то есть
В данном случае [$963$] = 5.8[$183$]10[sup]7[/sup] См/м, f = 10[sup]6[/sup] Гц, для воздуха можно приближённо считать [$949$] = [$956$] = 1, и ослабление составит
децибел.
5
Это самое лучшее решение!
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