{"id":209470,"date":"2024-03-21T14:08:15","date_gmt":"2024-03-21T14:08:15","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e3%83%95%e3%83%aa%e3%82%b9%e3%81%ae%e4%bc%9d%e9%80%81%e5%85%ac%e5%bc%8f-%e6%a6%82%e8%a6%81%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%83%95%e3%83%aa%e3%82%b9%e3%81%ae%e4%bc%9d%e9%80%81%e5%85%ac%e5%bc%8f-%e6%a6%82%e8%a6%81%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%83%95%e3%83%aa%e3%82%b9%e3%81%ae%e4%bc%9d%e9%80%81%e5%85%ac%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\u306f\u3001\u7121\u7dda\u901a\u4fe1\u306b\u304a\u3051\u308b\u9001\u4fe1\u6a5f\u304b\u3089\u53d7\u4fe1\u6a5f\u3078\u306e\u96fb\u529b\u4f1d\u9001\u3092\u4e88\u6e2c\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u516c\u5f0f\u3067\u3042\u308a\u3001\u30a2\u30f3\u30c6\u30ca\u9593\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u5206\u6790\u3059\u308b\u969b\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\uff08Friis transmission equation\uff09\u306f\u3001\u7121\u7dda\u901a\u4fe1\u306e\u5206\u91ce\u3067\u975e\u5e38\u306b\u91cd\u8981\u306a\u516c\u5f0f\u3067\u3059\u3002\u3053\u306e\u516c\u5f0f\u306f\u9001\u4fe1\u6a5f\u304b\u3089\u53d7\u4fe1\u6a5f\u3078\u306e\u96fb\u529b\u4f1d\u9001\u3092\u4e88\u6e2c\u3057\u3001\u30a2\u30f3\u30c6\u30ca\u9593\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u7279\u306b\u30de\u30a4\u30af\u30ed\u6ce2\u3084\u885b\u661f\u901a\u4fe1\u3001\u7121\u7ddaLAN\u306a\u3069\u306e\u89e3\u6790\u306b\u304a\u3044\u3066\u5e45\u5e83\u304f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\u306e\u6982\u8981<\/h2>\n<p>\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n\\[ P_r = P_t \\cdot G_t \\cdot G_r \\cdot \\left( \\frac{\\lambda}{4\\pi R} \\right)^2 \\]\n<\/p>\n<p>\u3053\u3053\u3067\u3001\u5404\u5909\u6570\u306e\u610f\u5473\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<ul>\n<li>\\( P_r \\): \u53d7\u4fe1\u96fb\u529b (W)<\/li>\n<li>\\( P_t \\): \u9001\u4fe1\u96fb\u529b (W)<\/li>\n<li>\\( G_t \\): \u9001\u4fe1\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3 (\u7121\u6b21\u5143)<\/li>\n<li>\\( G_r \\): \u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3 (\u7121\u6b21\u5143)<\/li>\n<li>\\( \\lambda \\): \u6ce2\u9577 (m)<\/li>\n<li>\\( R \\): \u9001\u4fe1\u6a5f\u3068\u53d7\u4fe1\u6a5f\u9593\u306e\u8ddd\u96e2 (m)<\/li>\n<\/ul>\n<p>\u3053\u306e\u516c\u5f0f\u306f\u3001\u4f1d\u9001\u8def\u4e2d\u3067\u306e\u640d\u5931\u3084\u969c\u5bb3\u7269\u306b\u3088\u308b\u6e1b\u8870\u3092\u8003\u616e\u3057\u306a\u3044\u3001\u7406\u60f3\u7684\u306a\u81ea\u7531\u7a7a\u9593\u306b\u304a\u3051\u308b\u96fb\u6ce2\u4f1d\u64ad\u3092\u524d\u63d0\u3068\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\u306e\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\u3092\u4f7f\u3063\u3066\u9001\u4fe1\u96fb\u529b\u3068\u53d7\u4fe1\u96fb\u529b\u3092\u8a08\u7b97\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u5177\u4f53\u7684\u306a\u30b9\u30c6\u30c3\u30d7\u3067\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30c6\u30c3\u30d71: \u5909\u6570\u306e\u53ce\u96c6<\/h3>\n<p>\u307e\u305a\u3001\u516c\u5f0f\u306b\u5fc5\u8981\u306a\u5168\u3066\u306e\u5909\u6570\u3092\u53ce\u96c6\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n<ul>\n<li>\u9001\u4fe1\u96fb\u529b \\( P_t = 1 \\text{ W} \\)<\/li>\n<li>\u9001\u4fe1\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3 \\( G_t = 10 \\)<\/li>\n<li>\u53d7\u4fe1\u30a2\u30f3\u30c6\u30ca\u30b2\u30a4\u30f3 \\( G_r = 15 \\)<\/li>\n<li>\u5468\u6ce2\u6570 \\( f = 2.4 \\text{ GHz} \\)  (\u7121\u7ddaLAN\u306e\u5468\u6ce2\u6570\u5e2f\uff09<\/li>\n<li>\u9001\u53d7\u4fe1\u9593\u306e\u8ddd\u96e2 \\( R = 50 \\text{ m} \\)<\/li>\n<\/ul>\n<h3>\u30b9\u30c6\u30c3\u30d72: \u6ce2\u9577\u306e\u8a08\u7b97<\/h3>\n<p>\u6ce2\u9577 \\( \\lambda \\) \u306f\u3001\u5149\u901f \\( c \\) \u3068\u5468\u6ce2\u6570 \\( f \\) \u3092\u4f7f\u3063\u3066\u6c42\u3081\u3089\u308c\u307e\u3059\uff1a<\/p>\n<p>\n\\[ \\lambda = \\frac{c}{f} \\]\n<\/p>\n<p>\u5149\u901f \\( c \\) \u306f\u7d04 \\( 3 \\times 10^8 \\text{ m\/s} \\) \u3067\u3059\u3002\u3088\u3063\u3066\u3001<\/p>\n<p>\n\\[ \\lambda = \\frac{3 \\times 10^8}{2.4 \\times 10^9} = 0.125 \\text{ m} \\]\n<\/p>\n<h3>\u30b9\u30c6\u30c3\u30d73: \u516c\u5f0f\u3078\u306e\u4ee3\u5165<\/h3>\n<p>\u5fc5\u8981\u306a\u5024\u304c\u3059\u3079\u3066\u96c6\u307e\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\u306b\u4ee3\u5165\u3057\u307e\u3059\uff1a<\/p>\n<p>\n\\[ P_r = 1 \\text{ W} \\cdot 10 \\cdot 15 \\cdot \\left( \\frac{0.125}{4\\pi \\cdot 50} \\right)^2 \\]\n<\/p>\n<p>\u3053\u308c\u3092\u8a08\u7b97\u3059\u308b\u3068\u3001<\/p>\n<p>\n\\[ P_r = 1 \\cdot 10 \\cdot 15 \\cdot \\left( \\frac{0.125}{628.318} \\right)^2 \\approx 0.015 \\text{ W} \\]\n<\/p>\n<p>\n\u3064\u307e\u308a\u3001\u53d7\u4fe1\u96fb\u529b\u306f0.015W\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30a2\u30f3\u30c6\u30ca\u9593\u306e\u96fb\u529b\u4f1d\u9001\u91cf\u304c\u7406\u89e3\u3067\u304d\u307e\u3059\u3002\n<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\u306f\u3001\u7121\u7dda\u901a\u4fe1\u306b\u304a\u3044\u3066\u96fb\u529b\u4f1d\u9001\u3092\u4e88\u6e2c\u3059\u308b\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u3053\u306e\u516c\u5f0f\u3092\u7406\u89e3\u3057\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30a2\u30f3\u30c6\u30ca\u306e\u914d\u7f6e\u3084\u96fb\u529b\u7ba1\u7406\u3092\u52b9\u679c\u7684\u306b\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u96fb\u6ce2\u306e\u7279\u6027\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u8a2d\u8a08\u3055\u308c\u305f\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u901a\u4fe1\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30d5\u30ea\u30b9\u306e\u4f1d\u9001\u516c\u5f0f\u306f\u3001\u7121\u7dda\u901a\u4fe1\u306b\u304a\u3051\u308b\u9001\u4fe1\u6a5f\u304b\u3089\u53d7\u4fe1\u6a5f\u3078\u306e\u96fb\u529b\u4f1d\u9001\u3092\u4e88\u6e2c\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u516c\u5f0f\u3067\u3042\u308a\u3001\u30a2\u30f3\u30c6\u30ca\u9593\u306e\u76f8\u4e92\u4f5c\u7528\u3092\u5206\u6790\u3059\u308b\u969b\u306b\u4f7f\u7528\u3055\u308c\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-209470","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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