LINEAR HIGH FREQUENCY ANTENNAS OVER A FINITELY CONDUCTING SPHERICAL EARTH

Abstract

Vertical radiation patterns of vertical quarter-wave monopoles, and of vertical and horizontal half-wave dipoles located at various heights up to twenty wavelengths over several typical types of ground are shown. Vertical antennas have the best low-angle patterns at low heights and at medium heights over land. For low and medium antenna heights, only vertically polarized antennas over water radiate appreciable energy at zero or negative elevation angles. The propagation factor used to calculate the antenna patterns can be accurately evaluated with the simple two-ray theory for elevation angles greater than one or two degrees. For smaller, and negative, elevation angles the full wave theory for diffraction by a sphere must be used.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1966
Accession Number
AD0809305

Entities

People

  • Leslie A. Berry
  • Mary E. Chrisman

Organizations

  • Institute for Telecommunication Sciences

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Coordinate Systems
  • Earth Sciences
  • Ecology
  • Electromagnetic Wave Propagation
  • Equations
  • Frequency
  • Fresh Water
  • Fresnel Zones
  • Geometry
  • Ice
  • Low Angles
  • Radiation Resistance
  • Radio Waves
  • Sea Ice
  • Sea Water
  • Standing Waves
  • Water

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering