ANTENNA RESEARCH.

Abstract

A study was made of electrically small antennas with top capacity and a transistor circuit between the top capacity and the main rod of the radiator. We find broadband characteristics, semi-directivity, good matching to standard output cables and the possibility to vary the antenna characteristics by changing the bias of the transistors were found. The noise of such antennas was measured. Extended measurements were made on plane Archimedean spiral antennas to improve the knowledge of antenna currents and nearfield. Measurements on the backing cavity resonances led to the development of lossy foils to avoid unwanted resonances within the cavity. It was demonstrated that lossy foils improved the radiation patterns and the broadband matching of the input impedance at the resonance frequencies of the cavity. (Author)

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1966
Accession Number
AD0648850

Entities

People

  • H. H. Meinke

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Antenna Radiation Patterns
  • Antennas
  • Broadband
  • Electrically Small Antennas
  • Frequency
  • Impedance
  • Measurement
  • Radiation
  • Radiation Patterns
  • Resonance
  • Spiral Antennas
  • Standards
  • Transistors

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Electronics Engineering