Apti Inc.

Paul G Elliot

A folded crossed grid dipole antenna element includes one or more partially or fully conductive areas in the antenna element. The conductive areas are defined by a group of conductors of the antenna element. In a further configuration, upper and lower tiers of a conventional antenna element are essentially switched and a transmission feed line is provided to the upper tier via an opening in the lower tier.

Folded cross grid dipole antenna

The antenna array element provides an active element input impedance with a practical tuning frequency range of 3.6:1 (almost two octaves) and a wide instantaneous bandwidth. The balanced feed inputs to the element may be phased to produce any desired polarization. The antenna element is formed from two stacked crossed grid dipole elements with carefully optimized dimensions. The interelement array spacing is the maximum possible for/grating lobe free operation using a rectangular array lattice.

Stacked crossed grid dipole antenna array element

A wide bandwidth, wide scan, antenna array element provides an active element impedance close to 350 ohms over a bandwidth approaching one octave in a periodic equilateral triangular array lattice. The two balanced feed inputs to each element may be phased to produce any desired polarization. The interelement spacing is the maximum possible for grating lobe free operation. This antenna element combines features of a crossed grid dipole with a folded dipole. The antenna structure consists of conductors lying in two planes which are parallel to a ground plane. These are joined by a limited number of perpendicular conductors. The VSWR remains below 2:1 in a 300 or 350 ohm system for scan in any direction out to 30 degrees off of broadside over a bandwidth approaching one octave.

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Vienna, VA, United States of America

Paul G Elliot