Compact antenna for low and medium earth orbit satellite communication systems
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Apr 11, 2000
Grant Date -
N/A
app pub date -
Sep 30, 1998
filing date -
Sep 30, 1998
priority date (Note) -
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Abstract
A compact, low cost antenna communicates with low and medium earth orbit satellites. The antenna includes a plurality of micro-strip elements arranged about an axis and positioned to illuminate upper elevation angles. The micro-strip elements are perpendicular to each other and are oriented toward the horizon at 90 degree increments. Furthermore, the micro-strip elements are tilted at a 50 degree angle. A quadrifilar helix is positioned at the center of the micro-strip elements and positioned to illuminate lower elevation angles. The micro-strip elements generate an omni-directional field pattern in the azimuth plane. The quadrifilar helix generates a high-gain, narrow beam-width field pattern that is also omni-directional in the azimuth plane. The antenna provides improved immunity to specular ground reflections by limiting reception of signals below a threshold elevation angle. Also, the antenna provides continuous, uninterrupted communications by eliminating 'dead' period associated with conventional parabolic dish antennas.
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