{"id":140,"date":"2015-06-19T14:35:59","date_gmt":"2015-06-19T21:35:59","guid":{"rendered":"http:\/\/wiki.lillerant.com\/?p=140"},"modified":"2015-11-25T14:51:45","modified_gmt":"2015-11-25T21:51:45","slug":"blocking-or-shielding-bluetooth","status":"publish","type":"post","link":"http:\/\/wiki.lillerant.com\/?p=140","title":{"rendered":"Blocking or shielding Bluetooth"},"content":{"rendered":"<p>Here&#8217;s the math for those interested:<\/p>\n<p><!--more--><\/p>\n<p>Over on <a href=\"http:\/\/www.instructables.com\/\" target=\"_blank\">instructables<\/a>, user <a href=\"http:\/\/www.instructables.com\/member\/kelseymh\/\" target=\"_blank\">kelseymh<\/a> states:<\/p>\n<blockquote><p>Aluminum foil may not do it. The <a href=\"http:\/\/en.wikipedia.org\/wiki\/Skin_depth\" rel=\"nofollow\">skin depth<\/a> for aluminum at ~1 MHz (WiFi) is about 100 \u00b5m. Since that is also a typical thickness for retail foil, you&#8217;ll only get about 37% (1\/e) attenuation or so.<\/p>\n<p>For a decent Faraday cage, he&#8217;ll want to use perforated aluminum sheet, at least 500 \u00b5m thick, which will give five e-foldings of attenuation (0.0067).<\/p><\/blockquote>\n<p>On using multiple layers of aluminum foil:<\/p>\n<blockquote><p>You can treat each layer independently, and the attenuation simply multiplies.<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Here&#8217;s the math for those interested:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=\/wp\/v2\/posts\/140"}],"collection":[{"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=140"}],"version-history":[{"count":4,"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=\/wp\/v2\/posts\/140\/revisions"}],"predecessor-version":[{"id":160,"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=\/wp\/v2\/posts\/140\/revisions\/160"}],"wp:attachment":[{"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=140"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wiki.lillerant.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}