Multiple frequency antenna feed
First Claim
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1. A antenna feed comprising:
- an outer circular waveguide having a central axis and cross-sectional dimension;
an inner circular waveguide having a central axis, a cross-sectional dimension less than the cross-sectional dimension of the outer waveguide, and positioned inside of the outer waveguide so that the outer waveguide central axis is aligned with the inner waveguide central axis;
a plurality of patch elements arranged as a circular array about an array center point and positioned adjacent a forward end of the outer waveguide; and
a conical horn, having a small openings and a large opening, the small opening positioned adjacent the forward end of the outer waveguide and the large opening adjacent and coaxial with the array center point.
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Abstract
A multiple band antenna feed used with parabolic reflector antennas and the like. The feed is arranged as two coaxially disposed waveguides. A planar array of patch elements is disposed at the end of the coaxial waveguides so the energy in each band radiates from a common phase center. This simplifies the arrangement of associated subreflectors.
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Citations
22 Claims
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1. A antenna feed comprising:
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an outer circular waveguide having a central axis and cross-sectional dimension; an inner circular waveguide having a central axis, a cross-sectional dimension less than the cross-sectional dimension of the outer waveguide, and positioned inside of the outer waveguide so that the outer waveguide central axis is aligned with the inner waveguide central axis; a plurality of patch elements arranged as a circular array about an array center point and positioned adjacent a forward end of the outer waveguide; and a conical horn, having a small openings and a large opening, the small opening positioned adjacent the forward end of the outer waveguide and the large opening adjacent and coaxial with the array center point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An antenna feed comprising:
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an outer circular waveguide having a central axis and cross-sectional dimension; an inner circular waveguide having a central axis, a cross-sectional dimension less than the cross-sectional dimension of the outer waveguide, and positioned inside of the outer waveguide so that the outer waveguide central axis is aligned with the inner waveguide central axis; a plurality of patch elements arranged as a circular array about an array center point, and positioned adjacent a forward end of the outer waveguide. a conical horn, having a small opening and large opening, the small opening positioned adjacent the forward end of the outer waveguide and the large opening adjacent and coaxial with the array center point; a dielectric matching ring positioned inside of the outer waveguide in a space between the inner and outer waveguides, near the outer waveguide forward end and the small opening of the conical horn; polarizing means, positioned adjacent a rear end of the outer waveguide opposite the forward end, for coupling energy from an energy source to the inner waveguide, and for converting the energy from a first polarization as received to a second polarization inside the inner waveguide; transition means, positioned in a middle portion of the outer waveguide between the forward end and a rear end opposite the forward end, for coupling energy from an energy source to the outer waveguide; a dielectric card polarizer, positioned in the space between the inner and outer waveguides and between the outer waveguide forward end and the transition means; and means, positioned adjacent the patch elements, for preventing radiation from interfering with operation of the antenna feed.
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16. An antenna comprising:
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a. a parabolic reflector having a focal point; b. a subreflector positioned adjacent the focal point of the parabolic reflector and having its own focal point; and c. an antenna feed positioned with a forward end adjacent the subreflector focal point, the antenna feed comprising; an outer circular waveguide having a central axis; an inner circular waveguide having a central axis and positioned inside of and coaxially with the outer waveguide; and a circular array of circular patch elements, formed on a microstrip circuit board, and arranged near the forward end of the feed. - View Dependent Claims (17, 18)
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19. An antenna comprising:
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a. a parabolic reflector having a focal point; and b. an antenna feed positioned adjacent the focal point and facing the reflector, the antenna feed comprising; an outer circular waveguide having a central axis; an inner circular waveguide having a central axis and positioned inside of and coaxially with the outer waveguide; and a circular array of circular patch elements, formed on a microstrip circuit board, and arranged near the forward end of the feed. - View Dependent Claims (20, 21)
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22. An antenna array comprising:
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a plurality of circular patch elements, arranged as a circular array, the circular array having an array center point, each patch element having a center point, each of said patch element center points being equally distant from the array center point; and a plurality of polarizing means, at least one polarizing means coupled to each circular patch element, for circularly polarizing the circular patch element, said at least one polarizing means comprising first and second feed probes connected to the patch element and disposed substantially orthogonally with respect to the patch element, wherein the at least one polarizing means additionally comprises; a central ground plated through feed, connected to the patch element at the patch element center point; and transmission line ring means, connected to the first and second feed probes and the ground feed, for providing a combined patch signal.
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Specification