Accession Number:

ADA231428

Title:

Tactical HF Field Expedient Antenna Performance. Volume 2

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1990-03-01

Pagination or Media Count:

58.0

Abstract:

This thesis investigates the performance of various configurations of tactical High Frequency HF field deployable antennas in the presence of lossy earth. Antennas investigated include horizontal dipoles, short sloping wires, inverted vees, and monopoles with buried and elevated radials. Numerical models of the antennas are exercised via the Numerical Electromagnetic Code NEC for radiation pattern performance. Antennas are analyzed for applicability to 1 short-range Near Vertical Incident Skywave NVIS, where high elevation radiation angles are required, 2 medium-and long-range low radiation angle use, and 3 vertically polarized low-angle radiation for ground wave communication. Good NVIS and ground wave performance occurs for horizontal dipoles. Sloping wires and sloping dipoles are similar to horizontal dipoles but exhibit a moderate amount of azimuth plane directivity. Vertical monopoles with at least 15 buried radials produce medium-and long-range skyware coverage and good ground wave performance. Four elevated radials for quarter-wavelength monopoles are shown to out-perform 15 buried radials and are much easier to erect. The larger and more difficult-to-erect inverted vee dipole slightly outperforms a monopole by virtue of modest azimuth plane directivity. The results of this study can be included in an antenna engineering handbook and can be used to interface with existing ionospheric propagation codes in order to obtain optimum communication effectiveness.

Subject Categories:

  • Soil Mechanics
  • Electrical and Electronic Equipment
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE