Feed Region Modes in Dipole Phased Arrays.

Abstract

Feed region modes are derived for a class of dipole phased arrays. The dipole and its balun are a linearly polarized version of the PAR antenna element, and are modeled in strip-line geometry. Knowledge of the feed region modes is essential in determining the influence of supports on the element scan performance, and should shed light on the formation of blind-spots in dipole arrays. It is shown that for practical spacings the balanced, strip-line feed structure supports a propagating TM mode, in addition to two TEM modes. The propagation constant of this mode is scan dependent, and under inappropriate conditions its cut-off occurs before the onset of the grating lobe. Pending further analysis, it is conjectured that this mode cut-off may cause the blind spots which limit the array scan coverage. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 01, 1979
Accession Number
ADA096469

Entities

People

  • A. Hessel
  • E. Mayer

Tags

Communities of Interest

  • Air Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Arrays
  • Charge Density
  • Current Density
  • Dielectric Waveguides
  • Dispersion Relations
  • Eigenvalues
  • Eigenvectors
  • Electric Fields
  • Equations
  • Geometry
  • Integral Equations
  • Numerical Analysis
  • Phase Shift
  • Phased Arrays
  • Strip Transmission Lines
  • Transmission Lines
  • Waveguides

Fields of Study

  • Physics

Readers

  • Microwave Engineering.
  • Phased Array Antenna Design.
  • Theoretical Analysis.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster
  • Space - Space Objects