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Консультация № 194654
10.02.2019, 13:15
0.00 руб.
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1
1
Здравствуйте! Прошу помощи в следующем вопросе:
1. Известно, что при прохождении границы раздела воздух-среда, интенсивность электромагнитного излучения уменьшается на S=80 дБ. Найти проводимость среды σ, если магнитная проницаемость μ=1. Частота излучения f=10^6 Гц.
Очень срочно нужно.
1. Известно, что при прохождении границы раздела воздух-среда, интенсивность электромагнитного излучения уменьшается на S=80 дБ. Найти проводимость среды σ, если магнитная проницаемость μ=1. Частота излучения f=10^6 Гц.
Очень срочно нужно.
Обсуждение
20.02.2019, 13:15
общий
это ответ
Здравствуйте, dar777!
Поскольку в условиях задачи не указан угол падения волны, будем считать, что волна падает перпендикулярно экрану. Тогда коэффициент прохождения электромагнитной волны по амплитуде определяется выражением
где
- волновое сопротивление воздуха, имеющего диэлектрическую проницаемость [$949$] и магнитную проницаемость [$956$],
- волновое сопротивление проводящей среды с проводимостью [$963$] на частоте f. С учётом этого можно записать
откуда
где [$949$][sub]0[/sub] = 8.8542[$183$]10[sup]-12[/sup] Ф/м - электрическая постоянная.
Согласно условию интенсивность электромагнитного излучения уменьшается на 80 дб или в 108 раз. Поскольку интенсивность излучения пропорциональна квадрату амплитуды, то коэффициент прохождения составит 1/[$8730$]108 = 0.0001. С учётом того, что для воздуха [$949$] = [$956$] = 1, для частоты f = 10[sup]6[/sup] будем иметь
Поскольку в условиях задачи не указан угол падения волны, будем считать, что волна падает перпендикулярно экрану. Тогда коэффициент прохождения электромагнитной волны по амплитуде определяется выражением
где
- волновое сопротивление воздуха, имеющего диэлектрическую проницаемость [$949$] и магнитную проницаемость [$956$],
- волновое сопротивление проводящей среды с проводимостью [$963$] на частоте f. С учётом этого можно записать
откуда
где [$949$][sub]0[/sub] = 8.8542[$183$]10[sup]-12[/sup] Ф/м - электрическая постоянная.
Согласно условию интенсивность электромагнитного излучения уменьшается на 80 дб или в 108 раз. Поскольку интенсивность излучения пропорциональна квадрату амплитуды, то коэффициент прохождения составит 1/[$8730$]108 = 0.0001. С учётом того, что для воздуха [$949$] = [$956$] = 1, для частоты f = 10[sup]6[/sup] будем иметь
5
Это самое лучшее решение!
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