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Helical antennas

  • US 4,148,030 A
  • Filed: 06/13/1977
  • Issued: 04/03/1979
  • Est. Priority Date: 06/13/1977
  • Status: Expired due to Term
First Claim
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1. An antenna comprising:

  • a pliable, electrically insulating substrate in the form of a sheet;

    a first group of coupled metal resonating elements deposited upon said sheet to define a first spiral, said elements resonating at frequencies within a first pass band;

    a second group of coupled metal resonating elements fixedly disposed upon said sheet to define a second spiral, said elements resonating at frequencies within a second pass band; and

    a cylindrical insulator having one end that is adapted for connection to a surface of an electrically conductive ground plate, said sheet being wound on said cylindrical insulator to cause said first and second groups of resonating elements to define first and second helixes, respectively.

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