Broad band dipole element and array
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United States of America Patent
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-
Apr 6, 1999
Grant Date -
N/A
app pub date -
Oct 11, 1996
filing date -
Oct 11, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved dipole antenna array with high radiation directivity and broad bandwidth is disclosed. Each dipole antenna is driven by a balun structure composed of an unbalanced J-shaped transmission line placed over a pair of ground plane extensions that are separated by a channel. The dipole antenna arms are connected to an intermediate point on the ground plane extensions so that the balun structure extends beyond the dipole antenna. The length of the dipole arms, their position on the ground plane extensions, and the extent to which the balun extends beyond the dipole antenna can be chosen to determine the desired operating frequency range. The antennas are fabricated on ground and circuit planes separated by a dielectric material and composed of conducting material deposited on dielectric sheets. A planar array of dipole antennas is formed with the ground plane circumscribing each antenna in the array to improve directivity. An electromagnetic reflecting plane is placed parallel to the array to increase radiation efficiency.
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