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Dual-band octafilar helix antenna

  • US 5,828,348 A
  • Filed: 09/22/1995
  • Issued: 10/27/1998
  • Est. Priority Date: 09/22/1995
  • Status: Expired due to Term
First Claim
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1. A dual-band octafilar helix antenna, comprising:

  • a first set of four helical radiators matched to a first frequency and disposed on a radiator portion of a support substrate;

    a second set of four helical radiators matched to a second frequency and disposed on said radiator portion of said support substrate and interleaved with said first set of radiators;

    wherein one of said first and second sets of radiators has a greater length than the other and uses a variable pitch for the helical shape along the portion of its length which extends beyond said other set of radiators; and

    at least one feed network formed on a feed portion of said support substrate providing 0°

    , 90°

    , 180° and

    270°

    signals to at least one of said first and second sets of radiators.

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