Modification of Standard Alford Loop Antenna for Use on Doppler Vor

Abstract

The standard Alford loops used in the Doppler VHF omnidirectional range (VOR) antenna array were modified and tests conducted to determine the reduction in parasitic current achieved as a result of the modification. It is concluded that the parasitic currents in the Alford loops of the Doppler VOR antenna array can be reduced appreciably by tuning the transmission line portions of the individual loops with a parallel plate capacitor. A further reduction in parasitic current can be effected by positioning the loops so that the transmission line crossovers are in line with the periphery of a circle through the centers of the loops and by alternating crossovers on either side of loop centers. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1961
Accession Number
AD0258735

Entities

People

  • S. E. Taggart

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Navigation
  • Antenna Arrays
  • Antennas
  • Arrays
  • Capacitors
  • Direction Finding
  • Frequency
  • Government Procurement
  • Loop Antennas
  • Orientation (Direction)
  • Position Finding
  • Radio Frequency
  • Radio Navigation
  • Sidebands
  • Standards
  • Standing Wave Ratios
  • Transmission Lines

Readers

  • Aviation Safety and Air Traffic Management
  • Phased Array Antenna Design.