The LPDA has several dipoles arranged in echelon and criss-cross fed from the front. The name comes from the geometric growth, which is logarithmic.
[img]http://www.hdtvprimer.com/ANTENNAS/lpda.gif[/img]
This is a very wideband antenna of medium gain. Usually only about three of the dipoles are carrying much current. The other elements are mostly inactive. As frequency increases, the active elements
Log-Periodic antenna (Log Periodic Dipole Array, LPDA)
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