{"id":1918,"date":"2010-02-08T22:11:28","date_gmt":"2010-02-09T03:11:28","guid":{"rendered":"http:\/\/rbachnet.wwwmi3-ss40.a2hosted.com\/?p=1918"},"modified":"2022-12-30T12:41:53","modified_gmt":"2022-12-30T17:41:53","slug":"wi-fi-harvester","status":"publish","type":"post","link":"https:\/\/rbach.net\/index.php\/wi-fi-harvester\/","title":{"rendered":"Wi-Fi Harvester"},"content":{"rendered":"<p><a title=\"Wi-Fi Harvester\" href=\"https:\/\/danspapers.com\/2012\/11\/doctor-gadget-after-sandy-the-pros-cons-of-a-wired-world\/\" target=\"_blank\" rel=\"noopener noreferrer\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-2082\" style=\"border: 0pt none; margin: 0px 2px;\" title=\"Wi-Fi Harvester\" src=\"https:\/\/i0.wp.com\/rbach.net\/wp-content\/uploads\/2010\/02\/electricity-150x150-e1561687773217.jpg?resize=85%2C85&#038;ssl=1\" alt=\"Wi-Fi Harvester\" width=\"85\" height=\"85\" \/><\/a> <em><a href=\"https:\/\/www.computerworld.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Computerworld<\/a> <\/em><a href=\"https:\/\/web.archive.org\/web\/20120119200121\/http:\/\/www.computerworld.com\/s\/article\/9146638\/Airnergy_s_Wi_Fi_power_harvester_Is_it_real_or_not_?taxonomyId=79\" target=\"_blank\" rel=\"noopener noreferrer\">reports<\/a> that RCA demonstrated a prototype device that converts Wi-Fi radio signals into DC power to charge wireless devices. The W-iFi Hotspot Power Harvester, also known as Airnergy, was shown at the 2010 Consumer Electronics Show. RCA&#8217;s device was able to charge a BlackBerry Bold with about 30 percent power in 90 minutes using Wi-Fi access points located nearby, according to an RCA official recorded on <a title=\"Geeky Gadgets\" href=\"http:\/\/www.geeky-gadgets.com\/airnergy-battery-charger-uses-wifi-signals-to-charge-11-01-2010\/\" target=\"_blank\" rel=\"noopener noreferrer\">video<\/a> by <a title=\"Geeky Gadgets\" href=\"https:\/\/www.geeky-gadgets.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Geeky-Gadgets.com<\/a>. The amount of charging time depends on a user&#8217;s proximity to the Wi-Fi hot spot.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/IMMbihbeIls\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>The Airnergy unit stores the charge in an internal lithium battery, so you don\u2019t necessarily have to be in a Wi-Fi hot spot to recharge your device. The device is about 2 in. by 3 in. in size and will sell for $39 to $49 this summer. RCA said it is developing a smaller version that would replace a battery inside a hand-held device and sell for about $60. That smaller version could ship in 2011.<\/p>\n<h3>Other wireless chargers<\/h3>\n<p>Demonstrations of wireless chargers have been a staple of CES for several years, and some products promised in 2008 have not materialized. Some products, such as the Dell Latitude Z laptop, allow charging by placing the laptop directly on a wireless charging stand. Fulton Innovation LLC, (<a href=\"https:\/\/wp.me\/p2wgaW-4n\" target=\"_blank\" rel=\"noopener noreferrer\">I wrote about here<\/a>) showed products and prototypes at CES. One Fulton technology concept powers a 12-watt light bulb from a transmitter placed 35 inches away. Powermat USA showed new wireless charging mats for handheld computers at prices ranging from $39 to $149, and the company&#8217;s CEO said Powermat has sold 750,000 devices since the company launched two months ago.<\/p>\n<p>There is much skepticism over this product. The <a href=\"http:\/\/en.wikipedia.org\/wiki\/Inverse-square_law\">inverse-square law<\/a> roughly says in this case that the signal would decrease in intensity inversely proportional to the square of the distance. Double the distance and signal strength drops by a fourth and so on. Thus at the distance at which most people find themselves from access points, the amount of energy available is minute.<\/p>\n<p>Here is an <a href=\"https:\/\/web.archive.org\/web\/20161230014418\/http:\/\/www.sensorsmag.com:80\/sensors-mag\/rf-energy-harvesting-enables-wireless-sensor-networks-6175\" target=\"_blank\" rel=\"noopener noreferrer\">article<\/a> from <em><a href=\"https:\/\/web.archive.org\/web\/20190420052325\/https:\/\/www.sensorsmag.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">SensorMag.com<\/a><\/em> that describes how RF energy harvesting works.<\/p>\n<p>&nbsp;<\/p>\n<p><em><a title=\"Ralph Bach\" href=\"https:\/\/rbach.net\/index.php\/new-resume\/\" target=\"_blank\" rel=\"noopener noreferrer\">Ralph Bach<\/a>\u00a0has been in IT long enough to know better and has blogged from his\u00a0<a title=\"Bach Seat\" href=\"https:\/\/rbach.net\/\" target=\"_blank\" rel=\"noopener noreferrer\">Bach Seat<\/a> about IT, careers, and anything else that catches his attention since 2005. You can follow him on <a class=\"broken_link\" href=\"http:\/\/www.linkedin.com\/in\/rb48334\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">LinkedIn<\/a>,\u00a0<a href=\"https:\/\/www.facebook.com\/ralph.bach.14\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>,\u00a0and\u00a0<a href=\"https:\/\/twitter.com\/rbach48334\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>. Email the Bach Seat\u00a0<a href=\"mailto:\/\/bach.seat@gmail.com\" target=\"_blank\" rel=\"noopener noreferrer\">here<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>RCA demo&#8217;d a power harvesting device called Airnergy at CES 2010 that converts Wi-Fi radio signals into DC power to charge wireless devices<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,3],"tags":[3240,1841,3371,17,1234,14,1784,352,132,579,25],"class_list":["post-1918","post","type-post","status-publish","format-standard","hentry","category-electricity","category-wi-fi","tag-3240","tag-airnergy","tag-ces","tag-electricity","tag-energy","tag-green","tag-harvesting","tag-powermat","tag-rca","tag-wi-fi-2","tag-wireless"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"RCA demo&#039;d 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