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Broadband dipole antenna system with coaxial feed-line coated with ferrite particles to reduce line currents

  • US 4,218,687 A
  • Filed: 10/31/1977
  • Issued: 08/19/1980
  • Est. Priority Date: 03/19/1976
  • Status: Expired due to Term
First Claim
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1. A broadband antenna operable with substantially uniform coverage over a band of frequencies f1 -f2, where f2 :

  • f1 is of the order of at least 2;

    1, having, in combination, successive in-line antenna elements with gaps defined therebetween; and

    coaxial feed-line means disposed along the elements and connected therewith, the outer line thereof being susceptible to induced extraneous currents that reduce the performance of the antenna, at least part of said outer line external to the elements having a continuous absorbing composition formed directly on the outer line by a continuous coating of the same with a dielectric layer containing ferrite particles, the coating having length and thickness dimensions sufficient to reduce substantially said extraneous line currents, so as to permit operation of said antenna with substantially uniform coverage over said band of frequencies.

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