Coupled multi-segment helical antenna
First Claim
1. A helical antenna comprising a radiator portion having a helically wound radiator extending from a first end of the radiator portion to a second end of the radiator portion, said radiator comprising:
- a first radiator segment of a length substantially equal to an odd multiple of a quarter wavelength extending in a helical fashion from the first end of the radiator portion toward the second end of the radiator portion, wherein said first radiator segment is a driven radiator segment, configured for connection to a feed; and
a second radiator segment of a length substantially equal to an odd multiple of a quarter wavelength extending in a helical fashion from the second end of the radiator portion toward the first end of the radiator portion and partially overlapping said first radiator segment, wherein said second radiator segment is a parasitic radiator;
wherein said first radiator segment is in proximity with said second radiator segment in the area of overlap such that said first and second radiator segments are electromagnetically coupled to one another such that said first and second radiator segments resonate at the same selected frequency.
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Accused Products
Abstract
A coupled multi-segment helical antenna is provided having a length that is shorter than otherwise obtainable for a conventional half-wavelength antenna. The coupled multi-segment helical antenna includes radiator portion having a plurality of helically wound radiators extending from one end of the radiator portion to the other end of the radiator portion. Each radiator is made up of a set of two or more segments. A first segment extends in a helical fashion from the first end of the radiator portion toward the second end of the radiator portion. The second segment extends in a helical fashion from the second end of the radiator portion toward the first end of the radiator portion, wherein a portion of the first radiator segment is in proximity with a portion of the second radiator segment such that the first and second radiator segments are electromagnetically coupled to one another.
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Citations
29 Claims
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1. A helical antenna comprising a radiator portion having a helically wound radiator extending from a first end of the radiator portion to a second end of the radiator portion, said radiator comprising:
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a first radiator segment of a length substantially equal to an odd multiple of a quarter wavelength extending in a helical fashion from the first end of the radiator portion toward the second end of the radiator portion, wherein said first radiator segment is a driven radiator segment, configured for connection to a feed; and a second radiator segment of a length substantially equal to an odd multiple of a quarter wavelength extending in a helical fashion from the second end of the radiator portion toward the first end of the radiator portion and partially overlapping said first radiator segment, wherein said second radiator segment is a parasitic radiator; wherein said first radiator segment is in proximity with said second radiator segment in the area of overlap such that said first and second radiator segments are electromagnetically coupled to one another such that said first and second radiator segments resonate at the same selected frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A helical antenna comprising a radiator portion having a plurality of helically wound multi-segment radiators extending from a first end of the radiator portion to a second end of the radiator portion, said multi-segment radiators each comprising at least first and second substantially parallel and overlapping segments, each of said segments being of a length substantially equal to an odd multiple of a quarter wavelength, wherein said first segment is physically separate from but electromagnetically coupled to said second segment, and wherein said first and second segments resonate at the same selected frequency.
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25. A helical antenna comprising a radiator portion having a plurality of helically wound multi-segment radiators extending from a first end of the radiator portion to a second end of the radiator portion, said multi-segment radiators each comprising an elongated driven segment extending from said first end and a plurality of elongated parasitic segments, wherein each segment of said parasitic segments is substantially parallel to and overlaps an adjacent segment and said plurality of parasitic segments axially extend substantially parallel to and beyond said driven segment, wherein each of said driven segment and a last parasitic segment extending from said second end is of a length substantially equal to an odd multiple of a quarter wavelength and each of said parasitic segments intermediate said driven and last parasitic segments is of a length substantially equal to an integer multiple of a half wavelength, and wherein said driven and parasitic segments resonate at the same selected frequency.
- 26. A helical antenna comprising a radiator portion having a plurality of helically wound multi-segment radiators extending from a first end of the radiator portion to a second end of the radiator portion, said multi-segment radiators each comprising at least first and second segments, wherein each of said first and second segments has a length substantially equal to an odd multiple of a quarter wavelength and said first segment is physically separate from but electromagnetically coupled to said second segment, wherein said radiators further comprise one or more intermediate radiator segments positioned between said first and second segments, and wherein each of said first, second, and intermediate radiator segments resonate at the same selected frequency.
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29. A helical antenna comprising a radiator portion having a helically wound radiator extending from a first end of the radiator portion to a second end of the radiator portion, said radiator comprising:
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a plurality of first radiator segments of a length substantially equal to an odd multiple of a quarter wavelength extending in a helical fashion from the first end of the radiator portion toward the second end of the radiator portion, wherein said first radiator segments are driven radiator segments, configured for connection to a feed; a plurality of second radiator segments of a length substantially equal to an odd multiple of a quarter wavelength extending in a helical fashion from the second end of the radiator portion toward the first end of the radiator portion and partially overlapping said first radiator segments, wherein said second radiator segments are parasitic radiators; and means for shorting said plurality of second radiator segments; wherein said first radiator segments are in proximity with said second radiator segments in the area of overlap such that said first and second radiator segments are electromagnetically coupled to one another such that said first and second radiator segments resonate at the same selected frequency.
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Specification