ANTENNA SYSTEM FOR COMMUNICATING SIMULTANEOUSLY WITH A SATELLITE AND A TERRESTRIAL SYSTEM
First Claim
1. An antenna system comprising:
- (a) a high impedance surface having a relatively higher impedance at a frequency of interest and having a relatively lower impedance at frequencies higher and lower than the frequency of interest;
(b) a set of elongate wire antennas disposed on said high impedance surface with their major axes disposed immediately adjacent said high impedance surface, each elongate antenna having a feed end arranged such that the feed end of each elongate wire antenna is disposed closer to a central portion of said high impedance surface than to a peripheral portion of said high impedance surface, each elongate wire antenna having a distal end directed towards the peripheral portion of said high impedance surface;
(c) each elongate wire antenna being associated with an impedance matching stub attached by a first end of the stub at the feed end the associated wire antenna, each impedance matching stub having a distal end remote from the first end thereof, the distal ends of said stubs being disposed closer to the central portion of the high impedance surface than are the first ends thereof, and (d) an antenna coupling arrangement coupled to the feed ends of said antennas for passing circularly polarized electromagnetic signals received by the antenna system to a first output thereof and for passing vertically polarized electromagnetic signals received by the antenna system to a second output thereof.
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Accused Products
Abstract
An antenna system for receiving both circularly polarized electromagnetic signals and linearly polarized electromagnetic signals, the circularly polarize signals arriving at the antenna system from a direction normal or oblique to a major surface of the antenna system and the linearly polarized signals arriving at the planar antenna system from a direction acute to said major surface. The antenna system includes a high impedance surface and a plurality of antenna elements disposed on said high impedance surface, the plurality antenna elements arranged in a pattern on said surface such first selected ones of said antenna elements are responsive to circular polarization and second selected ones of said antenna elements are responsive to linear polarization.
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Citations
25 Claims
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1. An antenna system comprising:
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(a) a high impedance surface having a relatively higher impedance at a frequency of interest and having a relatively lower impedance at frequencies higher and lower than the frequency of interest;
(b) a set of elongate wire antennas disposed on said high impedance surface with their major axes disposed immediately adjacent said high impedance surface, each elongate antenna having a feed end arranged such that the feed end of each elongate wire antenna is disposed closer to a central portion of said high impedance surface than to a peripheral portion of said high impedance surface, each elongate wire antenna having a distal end directed towards the peripheral portion of said high impedance surface;
(c) each elongate wire antenna being associated with an impedance matching stub attached by a first end of the stub at the feed end the associated wire antenna, each impedance matching stub having a distal end remote from the first end thereof, the distal ends of said stubs being disposed closer to the central portion of the high impedance surface than are the first ends thereof, and (d) an antenna coupling arrangement coupled to the feed ends of said antennas for passing circularly polarized electromagnetic signals received by the antenna system to a first output thereof and for passing vertically polarized electromagnetic signals received by the antenna system to a second output thereof. - View Dependent Claims (2)
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3. A planar antenna system for receiving both circularly polarized electromagnetic signals and linearly polarized electromagnetic signals, the circularly polarized signals arriving at the planar antenna system from a direction normal or oblique to a major surface of the antenna system and the linearly polarized signals arriving at the planar antenna system from a direction acute to said major surface, the antenna system comprising:
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a high impedance surface;
a plurality of antenna elements disposed on said high impedance surface, the plurality of antenna elements arranged in a pattern on said surface such that selected pairs of said antenna elements occur either (i) on one half of one side of said surface or (ii) in a linear relationship on one side of said surface; and
an antenna coupling arrangement coupled to said antenna elements for passing circularly polarized electromagnetic signals received by the antenna system to a first output thereof and for passing linearly polarized electromagnetic signals received by the antenna system to a second output thereof. - View Dependent Claims (4, 5)
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6. An antenna system for receiving both circularly polarized electromagnetic signals and linearly polarized electromagnetic signals, the circularly polarized signals arriving at the antenna system from a direction normal or oblique to a major surface of the antenna system and the linearly polarized signals arriving at the planar antenna system from a direction acute to said major surface, the antenna system comprising:
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a high impedance surface; and
a plurality of antenna elements disposed on said high impedance surface, the plurality of antenna elements arranged in a pattern on said surface such that first selected ones of said antenna elements are responsive to circular polarization and second selected ones of said antenna elements are responsive to linear polarization. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of receiving circularly polarized signals from a position relatively high in the sky and at the same time linearly polarized signals from a position relatively lower in the sky and closer to the horizon, the method comprising the steps of:
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(a) providing a high impedance surface; and
(b) disposing a plurality of antenna elements on said high impedance surface and arranging the plurality of antenna elements in a pattern on said surface such that first selected ones of said antenna elements are responsive to circular polarization and second selected ones of said antenna elements are responsive to linear polarization. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A antenna for receiving circularly polarized signals from a position relatively high in the sky and at the same time linearly polarized signals from a position relatively lower in the sky and closer to the horizon, the antenna comprising:
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a high impedance surface; and
a plurality of antenna elements disposed on said high impedance surface and arranged in a pattern on said surface, first selected ones of said antenna elements being responsive to circular polarization and second selected ones of said antenna elements being responsive to linear polarization. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification