Two-element driven array with improved tuning and matching

摘要

A two-element driven array with improved tuning and matching. First and second elongate conductive elements are provided having respective feed point gaps disposed substantially at their centers, the second elongate element being substantially coplanar and parallel with the first elongate element and spaced a predetermined distance therefrom. A phasing transmission line is connected between the feed point gap of the first elongate element and the feed point gap of the second elongate element so as to reverse the polarity there between. A variable transmission line having a movable shorting member is connected at one end thereof to the second end of the phasing transmission line. The first end of the phasing transmission line is the feed point for the antenna. A combined balun and impedance matching network is providing for coupling the antenna to an unbalanced, coaxial feed line. The combined network includes a shorting stub to adjust the impedance match between the antenna and the feed line.