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.
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