MODEL TESTS OF A SURFACE-WAVE TRANSMISSION LINE FOR LONG DISTANCE COMMUNICATION,

Abstract

It appears entirely possible to construct a Surface-Wave Transmission Line (SWTL) for long distance transmission with 100 Mc or more bandwidth having an average loss of 3 to 5 db per mile. For instance, if the conductor diameter is 0.4 inch and the outer diameter of the line 1 inch, and if the dielectric layer consists of natural polyethylene with a light protecting coat, the calculated loss is 2.2 db/mile at 100 Mc/s and 3.4 db/mile at 200 Mc/s. The actual loss will be about 10% higher due to imperfections of the conductor surface which are always present. If the supporting loss is 0.5 db/mile then the loss of a straight line section will be about 3 db/mile at 100 Mc/s and 4.2 db/mile at 200 Mc/s. At these frequencies the line is not affected by rain. Dry snow and thin layers of ice have little effect on the transmission loss. Therefore such a line should be applicable in areas where severe icing conditions occur rarely or not at all.

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1955
Accession Number
AD0656316

Entities

People

  • C. E. Sharp
  • G. Goubau

Tags

DTIC Thesaurus Topics

  • Bandwidth
  • Diameters
  • Dielectric Polymers
  • Frequency
  • Frequency Shift
  • Losses
  • Model Tests
  • Surface Waves
  • Transmission Lines
  • Transmission Loss
  • Wave Propagation
  • Waves

Readers

  • Microwave Engineering.
  • Polar and Arctic Studies
  • Thin Film Deposition Science.