Quadrifilar Helical Antenna Array for Line-of-Sight Communications Above the Ocean Surface

Abstract

This report describes the development of a linear array consisting of four quadrifilar helical antennas (QHAs) that is mounted on a buoy to support transmit and receive communications at 2.45 GHz along line-of-sight (LOS) paths above a sea water half-space. The array elements are designed to be immune to the multipath interference created by reflections of an incident signal from the surface of the ocean. A novel feed design for the array is described. The circuit and radiation characteristics of each QHA element measured in free space are presented. The predicted radiation pattern of each QHA element at its nominal height above a flat ocean surface is determined from the measured element pattern in free space.

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Document Details

Document Type
Technical Report
Publication Date
Jun 25, 2007
Accession Number
ADA473039

Entities

People

  • John P. Casey
  • Michael J. Josypenko
  • Stephen M. Davis

Organizations

  • Naval Undersea Warfare Center

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Antenna Arrays
  • Antennas
  • Coaxial Cables
  • Coordinate Systems
  • Frequency Bands
  • Geometry
  • Global Positioning Systems
  • Helical Antennas
  • Impedance
  • Line Of Sight
  • Linear Arrays
  • Multipath Interference
  • Radiation
  • Radiation Patterns
  • Radio Frequency
  • Standing Waves
  • Undersea Warfare

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Tactical Satellite Communications Systems Engineering.

Technology Areas

  • Space