Active Network Techniques for Improving Antenna Performance

Abstract

This study was concerned with improving the performance of electrically small antennas through the use of active-network techniques. Only antennas for the range 30-80 MHz were considered, and means were sought for reducing the noise figure of a receiving system employing such an antenna. Two types of active coupling networks were studied: negative-immittance converters (NIC), and feedback amplifiers. The results obtained show that an FET with feedback appears useful, whereas a NIC is impractical because of its excessive noise and its high sensitivity to changes in circuit and bias parameters.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 12, 1977
Accession Number
ADA045728

Entities

People

  • Alan C. Phillips
  • Alfred J. Bahr
  • Ulrich H. Gysel

Organizations

  • SRI International

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Antennas
  • Circuits
  • Couplings
  • Electrically Small Antennas
  • Feedback
  • Feedback Amplifiers
  • Frequency
  • Impedance
  • Negative Impedance Converters
  • Networks
  • Noise
  • Radiation
  • Schematic Diagrams
  • Scientists
  • Transistor Amplifiers
  • Transistors

Readers

  • Computer Networking
  • Electrical Engineering
  • Systems Analysis and Design