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Effective Length |
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effective length [ə¦fek·tiv ′leŋkth]
(naval architecture) Mean length of that portion of the ship's hull below the waterline. effective length Of a column, the distance between inflection points in the column when it bends. Effective Length (of an antenna), a parameter of wire antennas that characterizes the antenna’s efficiency in transmitting and receiving electromagnetic waves. The effective length for a receiving antenna is defined as the ratio of the electromotive force at the receiver input to the intensity of the electric field incident on the antenna; for a transmitting antenna, it is defined as the length in free space of a conductor with a uniform and inphase current distribution along its entire length that generates the same field intensity in the direction of maximum radiation as a real antenna under conditions of equal current amplitudes in the conductor and the real antenna. The effective antenna length is numerically identical in transmission and reception. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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