Log-periodic slot antennas

摘要

A log-periodic slot antenna has adjacent radiating elements connected by off-center co-planar lines thereby providing the required phase reversal and modifying the element impedance to match that of the co-planar line. By providing a ground plane restricted in size to that of the element array a difference pattern can be formed by the single antenna giving a sharp null in the longitudinal direction of the antenna. A dual log-periodic antenna formed from two such single antennas can be fed in-phase and produce two difference patterns one in the co-planar plane and one in the cross-polar plane.