Log-periodic monopole antenna

A log-periodic vertically polarized monopole antenna comprising

• first and second juxtaposed arrays spaced proximate to and perpendicular to an electrically conductive ground plane,
• each array comprising a plurality of radiating elements electrically connected in series with and at predetermined longitudinally spaced intervals, each of said elements being open adjacent to the ground plane,
• the space between adjacent elements of one of said arrays being opposite an element of the other of said arrays,
• the dimensions of and spacing between said elements of each array increasing from one end to the other in progressive increments of a predetermined ratio, and
• balanced feeding means connected to said one end of each of said first and second arrays for feeding same out of phase.

A log-periodic vertically polarized monopole antenna comprising

• first and second juxtaposed arrays closely spaced from and perpendicular to one side of an electrically conductive ground plane whereby to produce mirror images of said arrays on the opposite side of the ground plane,
• each array having a transmission line comprising a plurality of longitudinally spaced radiating elements and connectors electrically connecting adjacent elements,
• the elements of each array having dimensions and interelement spacings increasing from one end to the other in progressive increments of a predetermined ratio,
• balanced feed means comprising a feed line connected to each of said one ends of said transmission lines whereby said arrays and said images thereof have four feed points, respectively, and
• utilization apparatus connected to said feed means.