Data link antenna system
First Claim
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1. An antenna system having omni-directional radiation coverage, comprising:
- a plurality of antennas, each disposed to illuminate only a respective sector relative to a desired omnidirectional radiation coverage;
means for selectively coupling an RF drive signal to only a selected one of said antennas to radiate said signal only to the sector illuminated by said selected antenna; and
wherein each of said antennas comprises;
a parabolic cylindrical reflector surface characterized by a focus disposed above said surface;
a dipole structure arranged such that the back radiation of said dipole illuminates said reflector surface, the forward radiation of said dipole being free to radiate away from said surface without being redirected to said surface; and
means for supporting said dipole structure above said surface for feeding said drive signal to said dipole structure, said supporting and feeding means comprising an electrically conductive hollow support mast extending from said surface and to which said dipole structure is attached, and a center conductor element which extends through said hollow support mast to define a coaxial transmission line.
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Abstract
An antenna employs the back radiation of a crossed-dipole to illuminate a parabolic cylindrical reflector. The crossed dipole is supported by a feed network mast which simplifies the feed network and eliminates the need for other supporting structure and its electrical blockage. To form an antenna system having omni-directional radiation coverage, four of these antennas are located at the four quadrants, each covering one quadrant in the azimuth direction. The RF signal is fed through a single pole four throw switch to the selected antenna to be radiated to the desired direction.
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Citations
21 Claims
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1. An antenna system having omni-directional radiation coverage, comprising:
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a plurality of antennas, each disposed to illuminate only a respective sector relative to a desired omnidirectional radiation coverage; means for selectively coupling an RF drive signal to only a selected one of said antennas to radiate said signal only to the sector illuminated by said selected antenna; and wherein each of said antennas comprises; a parabolic cylindrical reflector surface characterized by a focus disposed above said surface; a dipole structure arranged such that the back radiation of said dipole illuminates said reflector surface, the forward radiation of said dipole being free to radiate away from said surface without being redirected to said surface; and means for supporting said dipole structure above said surface for feeding said drive signal to said dipole structure, said supporting and feeding means comprising an electrically conductive hollow support mast extending from said surface and to which said dipole structure is attached, and a center conductor element which extends through said hollow support mast to define a coaxial transmission line. - View Dependent Claims (2, 3, 4, 5)
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6. An antenna system having omni-directional radiation coverage, comprising:
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a plurality of antennas, each disposed to illuminate only a respective sector relative to the desired omni-directional radiation coverage; means for selectively coupling an RF drive signal only to a selected one of said antennas to radiate said signal only to the sector illuminated by said selected antenna; and
wherein each of said antennas comprises;a parabolic cylindrical reflector surface characterized by a focus disposed above said surface; a crossed-dipole structure arranged such that the back radiation of said crossed-dipole illuminates said reflector surface, the forward radiation of said crossed-dipole structure being free to radiate away from said surface without being redirected to said surface; and means for supporting said crossed-dipole structure above said surface and for feeding said drive signal to said crossed-dipole structure, said supporting and feeding means comprising an electrically conductive hollow support mast extending from said surface and to which said crossed-dipole structure is attached, and a center conductor element which extends through said hollow support mast to define a coaxial transmission line. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. An antenna system having omni-directional radiation coverage, comprising:
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first, second, third and fourth quadrant sector antennas disposed in a circularly symmetric fashion at respective quadrants relative to the desired azimuth omnidirectional radiation coverage; means for selectively coupling an RF drive signal only to a selected one of said antennas to radiate said signal only to a desired quadrant direction; and wherein each of said antennas comprises; a parabolic cylindrical reflector surface; a crossed-dipole structure arranged such that the back radiation of said crossed-dipole illuminates said reflector surface; and means for supporting said structure above said surface and for feeding said drive signal to said crossed-dipole structure, said supporting and feeding means comprising an electrically conductive hollow support mast extending from said surface and to which said crossed-dipole structure is attached, and a center conductor element which extends through said hollow support mast to define a coaxial transmission line. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification