Dual-band quadrifilar helix antenna
First Claim
Patent Images
1. A dual-band quadrifilar helix antenna, comprisingfour helical radiating elements each having an upper portion and a lower portion and a gap therebetween, each upper portion having an open end, and each lower portion having a feed point for receiving feed signals in phase quadrature;
- four traps, one corresponding trap each disposed in the gap and electrically connected to the upper portion and lower portion of a corresponding one of the four radiating elements equidistant from the corresponding open end, the traps configured to have a first impedance at a first frequency, and a second impedance greater than the first impedance, at a second frequency; and
at least one feed network providing 0°
, 90°
, 180° and
270°
signals to the feed points.
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Abstract
Dual-band quadrifilar helix antennas, comprising four radiating elements arranged helically to define a cylinder of constant radius, each radiating element having an upper portion and a lower portion and a gap there between, each upper portion having an open end, and each lower portion having a feed point for receiving feed signals in phase quadrature. Disposed within each gap and electrically connected to each upper and lower portion is a corresponding parallel LC circuit configured to have a first impedance at a first frequency, and a second impedance greater than the first impedance, at a second frequency. Alternative embodiments include structures with ground planes and top-fed helices without ground planes.
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Citations
35 Claims
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1. A dual-band quadrifilar helix antenna, comprising
four helical radiating elements each having an upper portion and a lower portion and a gap therebetween, each upper portion having an open end, and each lower portion having a feed point for receiving feed signals in phase quadrature; -
four traps, one corresponding trap each disposed in the gap and electrically connected to the upper portion and lower portion of a corresponding one of the four radiating elements equidistant from the corresponding open end, the traps configured to have a first impedance at a first frequency, and a second impedance greater than the first impedance, at a second frequency; and
at least one feed network providing 0°
, 90°
, 180° and
270°
signals to the feed points.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
a 180°
hybrid for providing from an input signal first and second output signals that differ from each other by 180°
;
a first 90°
hybrid having an input arm for accepting said first output signal from said 180°
hybrid and further having a first output arm for providing a third output signal and a second output arm for providing a fourth output signal, wherein said third and fourth output signals differ from one another by 90°
; and
a second 90°
hybrid having an input arm for accepting said second output signal from said 180°
hybrid and further having a third output arm for providing a fifth output signal and a fourth output arm for providing a sixth output signal, wherein said fifth and sixth output signals differ from one another by 90°
.
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18. The dual-band quadrifilar antenna of claim 1, further comprising a protective radome covering the radiating elements.
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19. The dual-band quadrifilar antenna of claim 1, further comprising means for supporting the helical structure of the radiating elements.
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20. A dual-band quadrifilar helix antenna, comprising
four radiating elements arranged helically to define a cylinder of constant radius, each radiating element having an upper portion and a lower portion and a gap therebetween, each lower portion having an open end, and each upper portion having a feed point for receiving feed signals in phase quadrature; -
four traps, one corresponding trap each disposed in the gap and electrically connected to the upper portion and lower portion of a corresponding one of the four radiating elements equidistant from the corresponding open end, the traps configured to have a first impedance at a first frequency, and a second impedance greater than the first impedance, at a second frequency;
conduit means disposed along the axis of the cylinder through which the feed signals are fed; and
a feed network providing 0°
, 90°
, 180° and
270°
feed signals to the feed points.- View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
a 180°
hybrid for providing from an input signal first and second output signals that differ from each other by 180°
;
a first 90°
hybrid having an input arm for accepting said first output signal from said 180°
hybrid and further having a first output arm for providing a third output signal and a second output arm for providing a fourth output signal, wherein said third and fourth output signals differ from one another by 90°
; and
a second 90°
hybrid having an input arm for accepting said second output signal from said 180°
hybrid and further having a third output arm for providing a fifth output signal and a fourth output arm for providing a sixth output signal, wherein said fifth and sixth output signals differ from one another by 90°
.
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34. The dual-band quadrifilar antenna of claim 20, further comprising a protective radome covering the radiating elements.
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35. The dual-band quadrifilar antenna of claim 20, further comprising means for supporting the helical structure of the radiating elements.
Specification
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Current AssigneeMitre Corporation
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Original AssigneeMitre Corporation
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InventorsSmolinski, Michael, Rosario, Eddie, Lamensdorf, David
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Primary Examiner(s)Nguyen, Hoang V.
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Application NumberUS10/174,330Time in Patent Office525 DaysField of Search343/895, 343/850, 343/853, 343/702, 343/796US Class Current343/895CPC Class CodesH01Q 1/38 formed by a conductive laye...H01Q 11/08 Helical antennasH01Q 5/321 within a radiating element ...
