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Cantenna : ウィキペディア英語版
Cantenna

A cantenna (a portmanteau blending the words ''can'' and ''antenna'') is a homemade directional waveguide antenna, made out of an open-ended metal can.
Cantennas are typically used to increase the range of (or discover) Wi-Fi networks.
== Construction ==

The cylinder portion of the can may consist of metal-coated paperboard.
Although some designs are based on a Pringles potato chips can, this tube is too narrow to increase the 2.4 GHz signal by a useful amount, although at 5 GHz it would be about the right size.〔(【引用サイトリンク】url=http://www.pelaginox.com/pc/pc-cantenna.html )〕 However, a cantenna can be made from various cans or tubes of an appropriate diameter.〔(【引用サイトリンク】url=http://www.saunalahti.fi/elepal/antenna2.html )〕 Some designs include a pole mount to elevate the cantenna.〔(【引用サイトリンク】title=Cantenna build on a pole (includes construction plans) )
At 2.4 GHz, losses can occur if the cable from the cantenna to the Wi-Fi circuitry is too long. A more efficient cantenna can be made by minimising this length or connecting the cantenna directly to the Wi-Fi circuitry.〔(Amateurlogic Episode 3 (Construction details for a more efficient cantenna) )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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