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# 34 - 34 34-1 34-2,3 1 x LC 2 1 LC = 2 = 3 P 3 1 c= 1...

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34장. 전자기파 34-1 맥스웰의 무지개: 전자기파의 분류

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34-2,3 전자기파 1. 전자기파의 발생기구에 따른 분류 장파, 라디오파(방송파) LC회로: 고전 전자기학 이론 가시광, x-선, 감마선 원자 또는 핵: 양자물리학 이론 2. 라디오파의 발생과 전파 1) LC 발진기 = 교류전류 공급원 2) 안테나(전자기파 방출원) = 진동 전기쌍극자 3) 안테나가 방출하는 전자기파의 시․공간적 변화 관측점 P에서의 시간적 변화 진행방향에 따른 공간적 변화
3. 전자기파의 특성 1) 전파속도: c = 1 ε 0 μ 0 ≡ 299,792,458 m / s (진공에서) 2) 전자기장 벡터 방향: ( E ⊥ B ) ⊥ 진행방향 전자기파는 횡파 E × B // 진행방향 위상: E B 는 조화함수꼴로 진동하며, 위상이 같음 진폭: E = E m sin ( kx - ω t ) B = B m sin ( kx - ω t ) B m E m = 1 c

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34-4 에너지 수송과 포인팅 벡터 1. 포인팅 벡터 (Poynting vector) 1) 정의 S ≡ 1 μ 0 E × B 2) 내용: 전자기파에
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