{"id":209247,"date":"2024-03-21T14:06:51","date_gmt":"2024-03-21T14:06:51","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e5%85%89%e3%83%95%e3%82%a1%e3%82%a4%e3%83%90%e3%83%bc%e3%81%ae%e6%b8%9b%e8%a1%b0%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/"},"modified":"2024-05-17T15:09:28","modified_gmt":"2024-05-17T15:09:28","slug":"%e5%85%89%e3%83%95%e3%82%a1%e3%82%a4%e3%83%90%e3%83%bc%e3%81%ae%e6%b8%9b%e8%a1%b0%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e5%85%89%e3%83%95%e3%82%a1%e3%82%a4%e3%83%90%e3%83%bc%e3%81%ae%e6%b8%9b%e8%a1%b0%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u5f0f | \u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3001\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u3092\u5177\u4f53\u7684\u306a\u4f8b\u3092\u7528\u3044\u3066\u8aac\u660e\u3002\u6e1b\u8870\u306e\u539f\u56e0\u3084\u5bfe\u7b56\u3082\u8a73\u7d30\u306b\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u5f0f | \u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306f\u73fe\u4ee3\u306e\u901a\u4fe1\u6280\u8853\u306b\u304a\u3044\u3066\u4e0d\u53ef\u6b20\u306a\u90e8\u54c1\u3067\u3059\u3002\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u3092\u901a\u3058\u3066\u30c7\u30fc\u30bf\u3092\u9ad8\u901f\u304b\u3064\u52b9\u7387\u7684\u306b\u9001\u4fe1\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u6e1b\u8870\u3068\u3044\u3046\u73fe\u8c61\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u5f0f\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3001\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<h3>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u3068\u306f\uff1f<\/h3>\n<p>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u3068\u306f\u3001\u5149\u304c\u30d5\u30a1\u30a4\u30d0\u30fc\u3092\u4f1d\u308f\u308b\u969b\u306b\u305d\u306e\u5f37\u5ea6\u304c\u4f4e\u4e0b\u3059\u308b\u73fe\u8c61\u3092\u6307\u3057\u307e\u3059\u3002\u3053\u306e\u6e1b\u8870\u306e\u539f\u56e0\u306b\u306f\u3001\u6750\u6599\u306e\u5438\u53ce\u3001\u6563\u4e71\u3001\u66f2\u3052\u306b\u3088\u308b\u640d\u5931\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002\u6e1b\u8870\u304c\u5927\u304d\u3051\u308c\u3070\u5927\u304d\u3044\u307b\u3069\u3001\u5149\u4fe1\u53f7\u306e\u54c1\u8cea\u304c\u4f4e\u4e0b\u3057\u3001\u9577\u8ddd\u96e2\u901a\u4fe1\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u6e1b\u8870\u306e\u5358\u4f4d\u3068\u6e2c\u5b9a\u65b9\u6cd5<\/h3>\n<p>\u6e1b\u8870\u306f\u901a\u5e38\u3001\u30c7\u30b7\u30d9\u30eb\u6bce\u30ad\u30ed\u30e1\u30fc\u30c8\u30eb\uff08dB\/km\uff09\u3067\u8868\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f1\u30ad\u30ed\u30e1\u30fc\u30c8\u30eb\u3042\u305f\u308a\u306e\u5149\u5f37\u5ea6\u306e\u6e1b\u5c11\u3092\u793a\u3059\u5358\u4f4d\u3067\u3059\u3002\u6e1b\u8870\u306e\u6e2c\u5b9a\u306b\u306f\u3001\u5149\u3092\u30d5\u30a1\u30a4\u30d0\u30fc\u306b\u9001\u308a\u3001\u305d\u306e\u51fa\u529b\u5f37\u5ea6\u3092\u8a08\u6e2c\u3059\u308b\u65b9\u6cd5\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n<h3>\u6e1b\u8870\u5f0f\u306e\u57fa\u672c\u5f62<\/h3>\n<p>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u5f0f\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<p>\\[ \\alpha = \\frac{10}{L} \\log_{10} \\left( \\frac{P_{\\text{in}}}{P_{\\text{out}}} \\right) \\]<\/p>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li>\\(\\alpha\\) \u306f\u6e1b\u8870\u4fc2\u6570\uff08dB\/km\uff09<\/li>\n<li>L \u306f\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u9577\u3055\uff08km\uff09<\/li>\n<li>\\(P_{\\text{in}}\\) \u306f\u5165\u529b\u5149\u5f37\u5ea6\uff08mW\uff09<\/li>\n<li>\\(P_{\\text{out}}\\) \u306f\u51fa\u529b\u5149\u5f37\u5ea6\uff08mW\uff09<\/li>\n<\/ul>\n<h3>\u6e1b\u8870\u4fc2\u6570\u306e\u8a08\u7b97\u4f8b<\/h3>\n<p>\u5177\u4f53\u7684\u306a\u4f8b\u3092\u6319\u3052\u3066\u6e1b\u8870\u4fc2\u6570\u306e\u8a08\u7b97\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u300110km\u306e\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u3092\u4f7f\u3063\u3066\u3001\u5165\u529b\u5149\u5f37\u5ea6\u304c2mW\u3001\u51fa\u529b\u5149\u5f37\u5ea6\u304c0.5mW\u3060\u3063\u305f\u3068\u3057\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u306e\u6e1b\u8870\u4fc2\u6570\u3092\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5024\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<ul>\n<li>L = 10km<\/li>\n<li>\\(P_{\\text{in}}\\) = 2mW<\/li>\n<li>\\(P_{\\text{out}}\\) = 0.5mW<\/li>\n<\/ul>\n<p>\u6e1b\u8870\u4fc2\u6570\u306e\u8a08\u7b97\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<p>\\[ \\alpha = \\frac{10}{10} \\log_{10} \\left( \\frac{2}{0.5} \\right) \\]<br \/>\n\\[ \\alpha = 1 \\log_{10} \\left( 4 \\right) \\]<br \/>\n\\[ \\alpha \\approx 1 \\times 0.602 = 0.602 \\text{dB\/km} \\]<\/p>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u4fc2\u6570\u306f0.602 dB\/km\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u6e1b\u8870\u306e\u5f71\u97ff\u3068\u5bfe\u7b56<\/h3>\n<p>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u304c\u5927\u304d\u3044\u3068\u3001\u901a\u4fe1\u8ddd\u96e2\u304c\u77ed\u304f\u3001\u9ad8\u54c1\u8cea\u306a\u901a\u4fe1\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002\u6e1b\u8870\u3092\u6291\u3048\u308b\u305f\u3081\u306e\u5bfe\u7b56\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u9ad8\u54c1\u8cea\u306a\u6750\u6599\u306e\u4f7f\u7528<\/strong>: \u3088\u308a\u900f\u660e\u306a\u30ac\u30e9\u30b9\u3084\u3001\u7279\u6b8a\u306a\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u65bd\u3057\u305f\u30d5\u30a1\u30a4\u30d0\u30fc\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u9069\u5207\u306a\u8a2d\u7f6e\u3068\u7ba1\u7406<\/strong>: \u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u66f2\u3052\u3084\u63a5\u7d9a\u90e8\u5206\u3067\u306e\u640d\u5931\u3092\u6700\u5c0f\u9650\u306b\u3059\u308b\u305f\u3081\u306e\u9069\u5207\u306a\u8a2d\u7f6e\u3068\u7ba1\u7406\u304c\u91cd\u8981\u3067\u3059\u3002<\/li>\n<li><strong>\u5897\u5e45\u5668\u306e\u4f7f\u7528<\/strong>: \u9577\u8ddd\u96e2\u901a\u4fe1\u3067\u306f\u3001\u4e2d\u7d99\u5730\u70b9\u306b\u5149\u5897\u5e45\u5668\u3092\u8a2d\u7f6e\u3057\u3066\u4fe1\u53f7\u5f37\u5ea6\u3092\u88dc\u5f37\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\u307e\u3068\u3081<\/h3>\n<p>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u306f\u3001\u901a\u4fe1\u6027\u80fd\u306b\u76f4\u63a5\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u6e1b\u8870\u306e\u8a08\u7b97\u65b9\u6cd5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6027\u80fd\u3092\u8a55\u4fa1\u3057\u3001\u6700\u9069\u306a\u901a\u4fe1\u74b0\u5883\u3092\u69cb\u7bc9\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u9069\u5207\u306a\u5bfe\u7b56\u3092\u8b1b\u3058\u308b\u3053\u3068\u3067\u3001\u6e1b\u8870\u3092\u6291\u3048\u3001\u9ad8\u54c1\u8cea\u306a\u901a\u4fe1\u3092\u5b9f\u73fe\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u6e1b\u8870\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3001\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u3092\u5177\u4f53\u7684\u306a\u4f8b\u3092\u7528\u3044\u3066\u8aac\u660e\u3002\u6e1b\u8870\u306e\u539f\u56e0\u3084\u5bfe\u7b56\u3082\u8a73\u7d30\u306b\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209247","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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