| 摘要 |
A satellite adapted antenna system has at least spaced apart first and second elements (104, 106), the first and second elements (104, 106) having substantially a common first polarization. A third element (108) has a second polarization that is opposite the first polarization of the first element (104). An antenna mode selector system selects between operatively connecting the first and second elements (104, 106) to form a specular antenna and operatively connecting the first and third elements (104, 108) to form a diversity antenna. Each of the first, second and third elements (104, 106, 108) are quadrifilar helix antennas. The first and second elements (104, 106) are quadrifilar helix antenna having right hand circuit polarization, and the third element (108) is a quadrifilar helix antenna having a left hand circuit polarization. The method for adapting a satellite antenna system has the steps of providing a diversity antenna having a polarization diversity mode defined by the first and third elements (104, 108); providing a specular antenna having a pattern gain mode defined by the first and second elements (104, 106); using the diversity mode for communicating with a satellite; and switching to the specular mode for communicating with the satellite in response to at least one predetermined characteristic.
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