{"id":209469,"date":"2024-03-21T14:08:15","date_gmt":"2024-03-21T14:08:15","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e3%82%a2%e3%83%b3%e3%83%86%e3%83%8a%e3%82%b2%e3%82%a4%e3%83%b3%e3%81%ae%e5%85%ac%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":"2024-05-17T15:13:23","modified_gmt":"2024-05-17T15:13:23","slug":"%e3%82%a2%e3%83%b3%e3%83%86%e3%83%8a%e3%82%b2%e3%82%a4%e3%83%b3%e3%81%ae%e5%85%ac%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\/%e3%82%a2%e3%83%b3%e3%83%86%e3%83%8a%e3%82%b2%e3%82%a4%e3%83%b3%e3%81%ae%e5%85%ac%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":"\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306e\u516c\u5f0f | \u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306e\u516c\u5f0f\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u3068\u306f\u4f55\u304b\u3001\u30c7\u30b7\u30d9\u30eb\u8868\u8a18\u3001\u5b9f\u52b9\u9762\u7a4d\u306e\u89e3\u8aac\u3092\u901a\u3057\u3066\u3001\u60c5\u5831\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u63d0\u4f9b\u3002<\/p>\n<h2>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306e\u516c\u5f0f | \u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u96fb\u6c17\u78c1\u6c17\u5b66\u3084\u901a\u4fe1\u5de5\u5b66\u306b\u304a\u3044\u3066\u3001\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306f\u975e\u5e38\u306b\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u3068\u306f\u4f55\u304b\u3001\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u3068\u306f\uff1f<\/h2>\n<p>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\uff08\u30a2\u30f3\u30c6\u30ca\u5229\u5f97\uff09\u3068\u306f\u3001\u3042\u308b\u30a2\u30f3\u30c6\u30ca\u304c\u7279\u5b9a\u306e\u65b9\u5411\u306b\u3069\u308c\u3060\u3051\u52b9\u7387\u3088\u304f\u96fb\u6ce2\u3092\u653e\u5c04\u307e\u305f\u306f\u53d7\u4fe1\u3067\u304d\u308b\u304b\u3092\u793a\u3059\u6307\u6a19\u3067\u3059\u3002\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306f\u4e00\u822c\u306b\u30c7\u30b7\u30d9\u30eb\uff08dB\uff09\u3067\u8868\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306e\u516c\u5f0f<\/h2>\n<p>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306f\u3001\u7406\u8ad6\u4e0a\u306e\u5168\u65b9\u5411\u6027\u30a2\u30f3\u30c6\u30ca\uff08\u7b49\u65b9\u6027\u30a2\u30f3\u30c6\u30ca\uff09\u306b\u6bd4\u3079\u3066\u3001\u3042\u308b\u65b9\u5411\u3078\u306e\u653e\u5c04\u52b9\u7387\u304c\u3069\u308c\u304f\u3089\u3044\u9ad8\u3044\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u5177\u4f53\u7684\u306a\u8a08\u7b97\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059:<\/p>\n<p>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3 G \u306f\u6b21\u306e\u516c\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n\\[<br \/>\nG = \\frac{4 \\pi A_{eff}}{\\lambda^2}<br \/>\n\\]\n<\/p>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li>G \u306f\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\uff08\u7121\u6b21\u5143\u91cf\uff09<\/li>\n<li>4\u03c0 \u306f\u5168\u65b9\u5411\u6027\u30a2\u30f3\u30c6\u30ca\u306e\u7403\u9762\u56fa\u6709\u9762\u7a4d<\/li>\n<li>A_{eff} \u306f\u30a2\u30f3\u30c6\u30ca\u306e\u5b9f\u52b9\u9762\u7a4d\uff08square meters\uff09<\/li>\n<li>\u03bb \u306f\u96fb\u6ce2\u306e\u6ce2\u9577\uff08meters\uff09<\/li>\n<\/ul>\n<h2>\u30a2\u30f3\u30c6\u30ca\u306e\u5b9f\u52b9\u9762\u7a4d<\/h2>\n<p>\u30a2\u30f3\u30c6\u30ca\u306e\u5b9f\u52b9\u9762\u7a4d\uff08A_{eff}\uff09\u306f\u3001\u30a2\u30f3\u30c6\u30ca\u304c\u53d7\u4fe1\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u96fb\u529b\u3092\u8868\u3059\u9762\u7a4d\u3067\u3059\u3002\u3053\u308c\u3082\u30a2\u30f3\u30c6\u30ca\u306e\u8a2d\u8a08\u3084\u7528\u9014\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306e\u30c7\u30b7\u30d9\u30eb\u8868\u8a18<\/h2>\n<p>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306f\u3057\u3070\u3057\u3070\u30c7\u30b7\u30d9\u30eb\uff08dB\uff09\u3067\u8868\u3055\u308c\u307e\u3059\u3002\u30c7\u30b7\u30d9\u30eb\u306f\u5bfe\u6570\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u8a08\u7b97\u3055\u308c\u3001\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n\\[<br \/>\nG_{dB} = 10 \\log_{10} \\left( \\frac{P_{out}}{P_{in}} \\right)<br \/>\n\\]\n<\/p>\n<p>\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li>G_{dB} \u306f\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\uff08\u30c7\u30b7\u30d9\u30eb\uff09<\/li>\n<li>P_{out} \u306f\u30a2\u30f3\u30c6\u30ca\u304c\u653e\u5c04\u3059\u308b\u51fa\u529b\u96fb\u529b<\/li>\n<li>P_{in} \u306f\u30a2\u30f3\u30c6\u30ca\u304c\u53d7\u4fe1\u3059\u308b\u5165\u529b\u96fb\u529b<\/li>\n<\/ul>\n<h2>\u8a08\u7b97\u4f8b<\/h2>\n<p>\u5177\u4f53\u7684\u306a\u8a08\u7b97\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001\u6ce2\u9577\u304c 0.5 \u30e1\u30fc\u30c8\u30eb\uff08\u03bb = 0.5\uff09\u3067\u3001\u5b9f\u52b9\u9762\u7a4d\u304c 1 \u5e73\u65b9\u30e1\u30fc\u30c8\u30eb\u306e\u30a2\u30f3\u30c6\u30ca\u3092\u8003\u3048\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\uff08\u7121\u6b21\u5143\u91cf\uff09\u306e\u8a08\u7b97\u3092\u884c\u3044\u307e\u3059\uff1a<\/p>\n<p>\n\\[<br \/>\nG = \\frac{4 \\pi A_{eff}}{\\lambda^2} = \\frac{4 \\pi \\times 1}{0.5^2} = \\frac{4 \\pi}{0.25} = 16 \\pi \u2248 50.27<br \/>\n\\]\n<\/p>\n<p>\u6b21\u306b\u3001\u3053\u306e\u30b2\u30a4\u30f3\u3092\u30c7\u30b7\u30d9\u30eb\u8868\u8a18\u306b\u5909\u63db\u3057\u307e\u3059\uff1a<\/p>\n<p>\n\\[<br \/>\nG_{dB} = 10 \\log_{10}(50.27) \u2248 10 \\log_{10}(50) = 10 \\times 1.69897 \u2248 16.99 dB<br \/>\n\\]\n<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306f\u8a08\u7b97\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306f\u3001\u7279\u5b9a\u306e\u65b9\u5411\u306b\u5bfe\u3057\u3066\u30a2\u30f3\u30c6\u30ca\u304c\u3069\u308c\u3060\u3051\u52b9\u7387\u7684\u306b\u96fb\u6ce2\u3092\u9001\u53d7\u4fe1\u3067\u304d\u308b\u304b\u3092\u793a\u3059\u91cd\u8981\u306a\u6307\u6a19\u3067\u3059\u3002\u7269\u7406\u7684\u306a\u5b9f\u52b9\u9762\u7a4d\u3084\u6ce2\u9577\u306b\u57fa\u3065\u3044\u3066\u8a08\u7b97\u3055\u308c\u3001\u305d\u306e\u7d50\u679c\u3092\u30c7\u30b7\u30d9\u30eb\u3067\u8868\u3059\u3053\u3068\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7570\u306a\u308b\u30a2\u30f3\u30c6\u30ca\u306e\u6027\u80fd\u3092\u6bd4\u8f03\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305c\u3072\u3001\u7686\u3055\u3093\u3082\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306e\u6982\u5ff5\u3092\u7406\u89e3\u3057\u3001\u5b9f\u969b\u306e\u8a08\u7b97\u306b\u6311\u6226\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u306e\u516c\u5f0f\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3\u3068\u306f\u4f55\u304b\u3001\u30c7\u30b7\u30d9\u30eb\u8868\u8a18\u3001\u5b9f\u52b9\u9762\u7a4d\u306e\u89e3\u8aac\u3092\u901a\u3057\u3066\u3001\u60c5\u5831\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u63d0\u4f9b\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-209469","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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