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Консультация № 194666
10.02.2019, 15:32
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1
1
Здравствуйте! У меня возникли сложности с таким вопросом:
1. Определить эффективность экранирования S электромагнитного излучения с частотой f=20 МГц сплошного, плоского, однослойного медного экрана толщиной h=2 мм расположенного в воздухе. Удельное сопротивление меди roCu=1.7×10-7 Ом*м.
Очень срочно надо.
1. Определить эффективность экранирования S электромагнитного излучения с частотой f=20 МГц сплошного, плоского, однослойного медного экрана толщиной h=2 мм расположенного в воздухе. Удельное сопротивление меди roCu=1.7×10-7 Ом*м.
Очень срочно надо.
Обсуждение
20.02.2019, 15:33
общий
это ответ
Здравствуйте, dar777!
Ослабление электромагнитного излучения в проводящем материале характеризуется эффективной глубиной проникновения - расстоянием от поверхности, на котором амплитуда волны уменьшается в e раз. Для экрана с удельным сопротивлением [$961$] и магнитной проницаемостью [$956$] эффективная глубина проникновения волны с частотой f определяется формулой
где [$956$][sub]0[/sub] = 1.2566[$183$]10[sup]-6[/sup] Гн/м - магнитная постоянная.
Коэффициент ослабления на глубине h равен
откуда эффективность экранирования в децибелах составит
В данном случае h = 0.002 м, [$956$] = 1, f = 2[$183$]10[sup]7[/sup] Гц, [$961$] = 1.7[$183$]10[sup]-7[/sup] Ом[$183$]м и
Ослабление электромагнитного излучения в проводящем материале характеризуется эффективной глубиной проникновения - расстоянием от поверхности, на котором амплитуда волны уменьшается в e раз. Для экрана с удельным сопротивлением [$961$] и магнитной проницаемостью [$956$] эффективная глубина проникновения волны с частотой f определяется формулой
где [$956$][sub]0[/sub] = 1.2566[$183$]10[sup]-6[/sup] Гн/м - магнитная постоянная.
Коэффициент ослабления на глубине h равен
откуда эффективность экранирования в децибелах составит
В данном случае h = 0.002 м, [$956$] = 1, f = 2[$183$]10[sup]7[/sup] Гц, [$961$] = 1.7[$183$]10[sup]-7[/sup] Ом[$183$]м и
5
Это самое лучшее решение!
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