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Консультация № 194663
10.02.2019, 15:29
0.00 руб.
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1
1
Здравствуйте! Прошу помощи в следующем вопросе:
1. Экран составлен из очень тонких листов меди (roCu=1.7×10-7 Ом*м) и алюминия (roAl=2.5×10-7 Ом*м). Найти коэффициент прохождения электромагнитной волны частоты f=100 кГц через границу раздела сред. Поглощением пренебречь.
Очень срочно надо.
1. Экран составлен из очень тонких листов меди (roCu=1.7×10-7 Ом*м) и алюминия (roAl=2.5×10-7 Ом*м). Найти коэффициент прохождения электромагнитной волны частоты f=100 кГц через границу раздела сред. Поглощением пренебречь.
Очень срочно надо.
Обсуждение
20.02.2019, 13:58
общий
это ответ
Здравствуйте, dar777!
Коэффициент прохождения электромагнитной волны по амплитуде при переходе через границу раздела проводящих сред определяется выражением
где
- волновое сопротивление проводящей среды с удельным сопротивлением [$961$][sub]i[/sub] на частоте f, [$956$][sub]0[/sub] = 1.25664[$183$]10[sup]-6[/sup] Гн/м - магнитная постоянная. В данном случае [$961$][sub]1[/sub] = 1.7[$183$]10[sup]-7[/sup] Ом[$183$]м, [$961$][sub]2[/sub] = 2.5[$183$]10[sup]-7[/sup] Ом[$183$]м, f = 10[sup]5[/sup] Гц и
откуда коэффициент прохождения составит
Коэффициент прохождения электромагнитной волны по амплитуде при переходе через границу раздела проводящих сред определяется выражением
где
- волновое сопротивление проводящей среды с удельным сопротивлением [$961$][sub]i[/sub] на частоте f, [$956$][sub]0[/sub] = 1.25664[$183$]10[sup]-6[/sup] Гн/м - магнитная постоянная. В данном случае [$961$][sub]1[/sub] = 1.7[$183$]10[sup]-7[/sup] Ом[$183$]м, [$961$][sub]2[/sub] = 2.5[$183$]10[sup]-7[/sup] Ом[$183$]м, f = 10[sup]5[/sup] Гц и
откуда коэффициент прохождения составит
5
Это самое лучшее решение!
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