Analysis of the log-periodic folded slot array

In recent years then has been significant interest in conformal, low-profile, very wideband antennas. To this end various configurations of log-periodic antenna structures have been developed, mostly consisting of planar logarithmic spirals, toothed planar and wire structures, and the ubiquitous dipole array. Unfortunately, none of these designs easily lend themselves to low-profile, conformal mounting. A log-periodic antenna structure more suited to this type of mounting has been developed by Greiser and is called the log-periodic folded slot array (LPFSA). Accurate knowledge of the radiation patterns and impedance characteristics would facilitate the development and optimization of a design procedure for the LPFSA. The purpose of this investigation is to gain a more complete understanding of the LPFSA, with the goal of developing an optimized design procedure.<>