Very Broad Band VHF/UHF Omnidirectional Antenna Design Study

Abstract

This investigation examines a number of broad band VHF/UHF antennas with respect to their suitability for a small pilotless air vehicle (A/V). Specifically, the objective of this research was to find a vertically polarized omnidirectional VHF/UHF antenna having a bandwidth of at least 4:1, and whose dimensions are compatible with the size limitations of a small A/V. This investigation includes an extensive literature review, a computer analysis of a modified log-periodic dipole array, and an analysis of a number of thin-wire open-sleeve dipole antennas. The objective of the open-sleeve dipole analysis was to determine how the impedance bandwidth can be broadened by adjusting sleeve length, sleeve spacing, and transmission line impedance. Results indicate that the thin wire open-sleeve antenna can, theoretically, attain a 3.6:1 bandwidth for a VSWR of 3.0:1 or a 1.6:1 bandwidth for a 2.0:1 VSWR. Theses. (rrh)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1989
Accession Number
ADA215358

Entities

People

  • Gregory S. Clute

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Antenna Radiation Patterns
  • Broadband Antennas
  • Computer Programs
  • Computers
  • Discone Antennas
  • Electrical Engineering
  • Engineering
  • Helical Antennas
  • Literature Surveys
  • Log Periodic Antennas
  • Monopole Antennas
  • Omnidirectional Antennas
  • Radiation Patterns
  • Spiral Antennas
  • Transmission Lines

Readers

  • Phased Array Antenna Design.

Technology Areas

  • Space
  • Space - Satellites