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Coupled multi-segment helical antenna

  • US 5,990,847 A
  • Filed: 04/30/1996
  • Issued: 11/23/1999
  • Est. Priority Date: 04/30/1996
  • Status: Expired due to Term
First Claim
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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:

  • 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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