Driving-Point-Impedance Measurement and Balun Design for Spiral Antennas

Abstract

Measured impedance data are presented for two planar, equiangular, printed-circuit, two-arm, spiral antennas not mounted over cavities. Compact baluns with flat form factors were designed to match the average antenna impedance over the radiating frequency band found from these measurements, to an unbalanced 50-ohm impedance. The measured impedance and loss characteristics of the compact baluns, data showing the effect on antenna impedance of running a twin-lead transmission line close to the antenna, and impedance data for two complete balun/antenna configurations in free space are also presented.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1972
Accession Number
AD0756706

Entities

People

  • Lloyd A. Robinson
  • William B. Weir

Organizations

  • SRI International

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Antenna Configurations
  • Antenna Feeds
  • Antennas
  • Artificial Intelligence
  • Capacitance
  • Circuit Boards
  • Coaxial Cables
  • Connectors
  • Electrical Properties
  • Equivalent Circuits
  • Frequency
  • Frequency Bands
  • Materials
  • Printed Circuits
  • Resistance
  • Short Circuits
  • Transmission Lines

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Phased Array Antenna Design.

Technology Areas

  • Space