Digital terrestrial television Archives – The Green Optimistic green tech news, since 2008 Fri, 05 Aug 2011 16:31:27 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 2667534 Dengyo Unveils "Rectenna" Device That Harvests WiFi and DVB Signals https://www.greenoptimistic.com/dengyo-rectenna-wifi-dvb-20110805/ https://www.greenoptimistic.com/dengyo-rectenna-wifi-dvb-20110805/#respond Fri, 05 Aug 2011 16:31:27 +0000 https://www.greenoptimistic.com/?p=20002 Radio signals are mostly used for information transfer purposes, but the energy they contain is mostly left unused, bouncing off the various obstacles until all of it is transformed into lost heat. Nihon Dengyo Kosaku, a Japanese company, has come up with a device that harvests radio signals and uses their power.

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