{"id":209203,"date":"2024-03-21T14:06:36","date_gmt":"2024-03-21T14:06:36","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e4%bc%9d%e9%80%81%e6%90%8d%e5%a4%b1%e3%81%ae%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%80%81%e9%81%a9%e7%94%a8\/"},"modified":"2024-05-17T15:08:51","modified_gmt":"2024-05-17T15:08:51","slug":"%e4%bc%9d%e9%80%81%e6%90%8d%e5%a4%b1%e3%81%ae%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%80%81%e9%81%a9%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e4%bc%9d%e9%80%81%e6%90%8d%e5%a4%b1%e3%81%ae%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%80%81%e9%81%a9%e7%94%a8\/","title":{"rendered":"\u4f1d\u9001\u640d\u5931\u306e\u5f0f | \u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u9069\u7528"},"content":{"rendered":"<p class=\"sidekick\">\u4f1d\u9001\u640d\u5931\u306e\u5b9a\u7fa9\u3001\u30c7\u30b7\u30d9\u30eb\u3067\u306e\u8a08\u7b97\u65b9\u6cd5\u3001\u96fb\u6c17\u3084\u78c1\u6c17\u3001\u901a\u4fe1\u3001\u96fb\u529b\u4f1d\u9001\u3001\u97f3\u97ff\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u9069\u7528\u4f8b\u3092\u7c21\u6f54\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>\u4f1d\u9001\u640d\u5931\u306e\u5f0f | \u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u9069\u7528<\/h2>\n<p>\u96fb\u6c17\u3068\u78c1\u6c17\u306e\u4e16\u754c\u3067\u306f\u3001\u4f1d\u9001\u640d\u5931\uff08Transmission Loss\uff09\u306f\u975e\u5e38\u306b\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u4f1d\u9001\u640d\u5931\u306e\u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u305d\u3057\u3066\u9069\u7528\u306b\u3064\u3044\u3066\u308f\u304b\u308a\u3084\u3059\u304f\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h2>\u4f1d\u9001\u640d\u5931\u306e\u5b9a\u7fa9<\/h2>\n<p>\u4f1d\u9001\u640d\u5931\u3068\u306f\u3001\u96fb\u529b\u304c\u9001\u4fe1\u5143\u304b\u3089\u53d7\u4fe1\u5143\u306b\u4f1d\u9001\u3055\u308c\u308b\u969b\u306b\u5931\u308f\u308c\u308b\u96fb\u529b\u306e\u91cf\u3092\u6307\u3057\u307e\u3059\u3002\u3053\u306e\u640d\u5931\u306f\u3001\u4fe1\u53f7\u304c\u30b1\u30fc\u30d6\u30eb\u3084\u305d\u306e\u4ed6\u306e\u4f1d\u9001\u30e1\u30c7\u30a3\u30a2\u3092\u901a\u904e\u3059\u308b\u969b\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u4f1d\u9001\u640d\u5931\u306f\u3001\u30c7\u30b7\u30d9\u30eb\uff08dB\uff09\u3067\u6e2c\u5b9a\u3055\u308c\u3001\u4fe1\u53f7\u306e\u6e1b\u8870\u3092\u793a\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u4f1d\u9001\u640d\u5931\u306e\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u4f1d\u9001\u640d\u5931\u306f\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u305f\u3081\u3001\u5834\u5408\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u8a08\u7b97\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u822c\u7684\u306b\u306f\u6b21\u306e\u5f0f\u3092\u4f7f\u7528\u3057\u307e\u3059\uff1a<\/p>\n<pre>\n\\[\nTL = 10 \\log \\left( \\frac{P_{in}}{P_{out}} \\right)\n\\]\n<\/pre>\n<p>\u3053\u3053\u3067\u3001<\/p>\n<ul>\n<li><b>\\(TL\\)<\/b>: \u4f1d\u9001\u640d\u5931\uff08dB\uff09<\/li>\n<li><b>\\(P_{in}\\)<\/b>: \u5165\u529b\u96fb\u529b\uff08W\uff09<\/li>\n<li><b>\\(P_{out}\\)<\/b>: \u51fa\u529b\u96fb\u529b\uff08W\uff09<\/li>\n<\/ul>\n<p>\u4f8b\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u5165\u529b\u96fb\u529b\u304c100W\u3001\u51fa\u529b\u96fb\u529b\u304c80W\u306e\u5834\u5408\u3001\u4f1d\u9001\u640d\u5931\u306f\u6b21\u306e\u3088\u3046\u306b\u8a08\u7b97\u3055\u308c\u307e\u3059\uff1a<\/p>\n<pre>\n\\[\nTL = 10 \\log \\left( \\frac{100}{80} \\right) = 10 \\log (1.25) \\approx 10 \\times 0.0969 \\approx 0.97 dB\n\\]\n<\/pre>\n<p>\u3053\u306e\u7d50\u679c\u304b\u3089\u3001\u3053\u306e\u30b7\u30b9\u30c6\u30e0\u306e\u4f1d\u9001\u640d\u5931\u306f\u7d040.97 dB\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h2>\u4f1d\u9001\u640d\u5931\u306e\u9069\u7528<\/h2>\n<p>\u4f1d\u9001\u640d\u5931\u306e\u6982\u5ff5\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u5206\u91ce\u3067\u5e83\u304f\u9069\u7528\u3055\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n<h3>\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0<\/h3>\n<p>\u643a\u5e2f\u96fb\u8a71\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306a\u3069\u306e\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u4fe1\u53f7\u304c\u9577\u8ddd\u96e2\u3092\u4f1d\u9001\u3059\u308b\u969b\u306e\u640d\u5931\u3092\u6700\u4f4e\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u4f1d\u9001\u640d\u5931\u3092\u77e5\u308b\u3053\u3068\u3067\u3001\u30b7\u30b9\u30c6\u30e0\u304c\u3069\u308c\u3060\u3051\u52b9\u7387\u7684\u306b\u52d5\u4f5c\u3057\u3066\u3044\u308b\u304b\u3092\u8a55\u4fa1\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u96fb\u529b\u4f1d\u9001<\/h3>\n<p>\u96fb\u529b\u7db2\u3067\u3082\u4f1d\u9001\u640d\u5931\u306f\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u767a\u96fb\u6240\u304b\u3089\u5bb6\u5ead\u3084\u4f01\u696d\u307e\u3067\u96fb\u529b\u3092\u9001\u308b\u969b\u306b\u3069\u308c\u3060\u3051\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u5931\u308f\u308c\u3066\u3044\u308b\u304b\u3092\u6e2c\u5b9a\u3057\u3001\u305d\u306e\u52b9\u7387\u3092\u6539\u5584\u3059\u308b\u305f\u3081\u306e\u624b\u304c\u304b\u308a\u3068\u3057\u307e\u3059\u3002<\/p>\n<h3>\u97f3\u97ff\u30b7\u30b9\u30c6\u30e0<\/h3>\n<p>\u30b9\u30d4\u30fc\u30ab\u30fc\u30b7\u30b9\u30c6\u30e0\u3084\u9632\u97f3\u5bfe\u7b56\u306b\u304a\u3044\u3066\u3082\u4f1d\u9001\u640d\u5931\u306f\u91cd\u8981\u3067\u3059\u3002\u97f3\u304c\u3069\u308c\u3060\u3051\u52b9\u7387\u7684\u306b\u4f1d\u308f\u308b\u304b\u3001\u307e\u305f\u306f\u3069\u308c\u3060\u3051\u906e\u97f3\u3067\u304d\u308b\u304b\u3092\u6e2c\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u4f1d\u9001\u640d\u5931\u306f\u96fb\u529b\u3084\u4fe1\u53f7\u306e\u4f1d\u9001\u306b\u304a\u3044\u3066\u4e0d\u53ef\u6b20\u306a\u6982\u5ff5\u3067\u3059\u3002\u305d\u306e\u5b9a\u7fa9\u3084\u8a08\u7b97\u65b9\u6cd5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u30b7\u30b9\u30c6\u30e0\u306e\u52b9\u7387\u3092\u8a55\u4fa1\u3057\u3001\u6539\u5584\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u65e5\u5e38\u751f\u6d3b\u304b\u3089\u7523\u696d\u5206\u91ce\u306b\u81f3\u308b\u307e\u3067\u3001\u4f1d\u9001\u640d\u5931\u306e\u7406\u89e3\u306f\u591a\u5c90\u306b\u308f\u305f\u308b\u5fdc\u7528\u3092\u6301\u3061\u3001\u4eba\u3005\u306e\u751f\u6d3b\u3092\u3088\u308a\u826f\u304f\u3059\u308b\u624b\u52a9\u3051\u3092\u3057\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u8a73\u3057\u304f\u5b66\u3073\u305f\u3044\u65b9\u306f\u3001\u5177\u4f53\u7684\u306a\u30b1\u30fc\u30b9\u30b9\u30bf\u30c7\u30a3\u3084\u5fdc\u7528\u4e8b\u4f8b\u3092\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u4f1d\u9001\u640d\u5931\u306e\u7406\u89e3\u304c\u6df1\u307e\u308b\u3053\u3068\u3067\u3001\u7269\u7406\u3084\u5de5\u5b66\u306e\u4e16\u754c\u304c\u307e\u3059\u307e\u3059\u9762\u767d\u304f\u611f\u3058\u3089\u308c\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f1d\u9001\u640d\u5931\u306e\u5b9a\u7fa9\u3001\u30c7\u30b7\u30d9\u30eb\u3067\u306e\u8a08\u7b97\u65b9\u6cd5\u3001\u96fb\u6c17\u3084\u78c1\u6c17\u3001\u901a\u4fe1\u3001\u96fb\u529b\u4f1d\u9001\u3001\u97f3\u97ff\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u9069\u7528\u4f8b\u3092\u7c21\u6f54\u306b\u89e3\u8aac\u3057\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-209203","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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