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Ultra wideband buoyant cable antenna element

  • US 7,868,833 B2
  • Filed: 08/20/2008
  • Issued: 01/11/2011
  • Est. Priority Date: 08/20/2008
  • Status: Expired due to Fees
First Claim
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1. A buoyant cable antenna for use with an underwater vehicle comprising:

  • a plurality of N segments of straight wire of uniform diameter, each segment being of equal length d/2, wherein the number of segments, N, is dictated by the frequency band of operation of said buoyant cable antenna;

    a plurality of capacitors coupled in series between every other segment of the plurality of N segments of straight wire such that each of said plurality of capacitors is separated by a distance d;

    a plurality of shunt inductors coupled to the adjoining segments of the plurality of N segments of straight wire that are not separated by a capacitor such that the each of said plurality of shunt inductors is separated by a distance d;

    a cylindrical layer of buoyant dielectric material surrounding said plurality of N segments of straight wire, capacitors and shunt inductors wherein said cylindrical sheath of dielectric material serves to insulate said N segments of straight wire;

    a cylindrical jacket of a non-conducting water proof material disposed over said cylindrical layer of buoyant dielectric material that serves to shield the N segments of straight wire from water;

    a coaxial feed line having a first end and a second end, said first end being joined to said underwater vehicle and said second end joined to a first end of one of said plurality of N segments of straight insulated wire, wherein said coaxial feed line serves as a transmission line; and

    a terminating cap joined to a second end of said straight insulated wire.

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