Broadband quardifilar helix with high peak gain on the horizon
First Claim
1. A quadrifilar helix antenna, comprising:
- a radiating member comprising four orthogonal conductive elements helically wound around a common axis, each said conductive element comprising between 3 to 7 turns about said common axis at a pitch of between 45 to 65 degrees, each said turn having a diameter of approximately 0.13 wavelengths to 0.27 wavelengths;
a feed coupler exciting each of said orthogonal conductive elements in phase quadrature at a feed point located at a first end of said antenna adjacent to a ground plane;
an opposing end of each of said conductive elements distal from said feed point forming an open circuit; and
wherein said antenna has a peak gain on horizon when said common axis is oriented vertically.
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Abstract
The invention concerns a quadrifilar helix antenna that has four orthogonal conductive elements helically wound around a common axis. Each of the conductive elements can have between 3 to 7 turns about the common axis at a pitch of between 45 to 65 degrees. Further, each turn has a diameter of about 0.13 wavelengths to 0.27 wavelengths. A feed coupler excites each of the orthogonal conductive elements in phase quadrature at a feed point located at a first end of the antenna adjacent to a ground plane. The resulting antenna can have an axial length of about 2.3 wavelengths to 6.9 wavelengths. Unlike conventional quadrifillar helix antennas, an opposing end of each of the conductive elements distal from the feed point forms an open circuit. The antenna configured as described can have a peak gain on horizon when the common axis is oriented vertically.
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Citations
32 Claims
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1. A quadrifilar helix antenna, comprising:
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a radiating member comprising four orthogonal conductive elements helically wound around a common axis, each said conductive element comprising between 3 to 7 turns about said common axis at a pitch of between 45 to 65 degrees, each said turn having a diameter of approximately 0.13 wavelengths to 0.27 wavelengths;
a feed coupler exciting each of said orthogonal conductive elements in phase quadrature at a feed point located at a first end of said antenna adjacent to a ground plane;
an opposing end of each of said conductive elements distal from said feed point forming an open circuit; and
wherein said antenna has a peak gain on horizon when said common axis is oriented vertically. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A quadrifilar helix antenna, comprising:
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a radiating member comprising four orthogonal conductive elements helically wound around a common axis, each said conductive element comprising 3 to 7 turns about said common axis; and
a feed coupler exciting each of said orthogonal conductive elements in phase quadrature at a feed point located at a first end of said antenna adjacent to a ground plane;
an opposing end of each of said conductive elements distal from said feed point forming an open circuit; and
wherein said antenna has a peak gain on horizon when said common axis is oriented vertically. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A quadrifilar helix antenna, comprising:
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a radiating member comprising four orthogonal conductive elements helically wound around a common axis, each turn having a diameter of about 0.13 wavelengths to 0.27 wavelengths; and
a feed coupler exciting each of said orthogonal conductive elements in phase quadrature at a feed point located at a first end of said antenna adjacent to a ground plane;
an opposing end of each of said conductive elements distal from said feed point forming an open circuit; and
wherein said antenna has a peak gain on horizon when said common axis is oriented vertically. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A quadrifilar helix antenna, comprising:
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a radiating member comprising four orthogonal conductive elements helically wound around a common axis, each said conductive element comprising approximately 5 turns about said common axis at a pitch of approximately 55 degrees, each said turn having a diameter of approximately 0.18 wavelengths to 0.2 wavelengths;
a feed coupler exciting each of said orthogonal conductive elements in phase quadrature at a feed point located at a first end of said antenna adjacent to a ground plane;
an opposing end of each of said conductive elements distal from said feed point forming an open circuit; and
wherein said antenna has a peak gain on horizon when said common axis is oriented vertically. - View Dependent Claims (31, 32)
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Specification