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Radiating coaxial cable and radio communication system using same

  • US 5,809,429 A
  • Filed: 09/22/1995
  • Issued: 09/15/1998
  • Est. Priority Date: 09/22/1995
  • Status: Expired due to Fees
First Claim
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1. A radiating coaxial cable having a longitudinal axis and adapted for use in communication systems requiring long lengths of cable, said cable comprisingan elongated smooth-surfaced, cylindrical inner conductor having a longitudinal axis, the axis of said inner conductor defining the axis of the cable,a dielectric material surrounding the inner conductor,a continuous outer conductor surrounding the dielectric in direct contact therewith and spaced from said inner conductor,said outer conductor forming at least one row of straight axially extending slots comprising elongated edges and located and dimensioned to produce a radiated field polarized perpendicularly to the axis of the cable when said cable is fed with electromagnetic energy, said slots also being configured, to substantially avoid the radiation of a field polarized parallel to the axis of the cable, and to avoid any significant radiation-attenuation of signals propagated longitudinally through the cable, said slots being spaced from each other by a center-to-center slot spacing which is a maximum of one-half free-space wave length, anda respective tab comprising an integral part of a respective one of said elongated edges of each slot for coupling energy between a space inside said outer conductor and the slots so that said energy is radiated outside said outer conductor.

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