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About: Radiation resistance     Goto   Sponge   NotDistinct   Permalink

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Radiation resistance, or , is proportional to the part of an antenna's feedpoint electrical resistance that is caused by power loss from the emission of radio waves from the antenna. Radiation resistance is an effective resistance, due to the power carried away from the antenna as radio waves. Unlike conventional resistance or "Ohmic resistance", radiation resistance is not due to the opposition to current (resistivity) of the imperfect conducting materials the antenna is made of. The radiation resistance is conventionally defined as the value of loss resistance that would dissipate the same amount of power as heat, as is dissipated by the radio waves emitted from the antenna, when fed at a minimum-voltage / maximum-current point ("voltage node"). From Joule's law, it is equal to the t