Characteristics of 5- to 35- Turn Uniform Helical Antennas
Abstract
The measured VSWR, gain, pattern and axial ratio characteristics of a uniformly wound helical antenna are presented. Experimental parametric studies were made of (1) fixed length helices with variable diameter and pitch angle (8. 6 to 10 turns), and (2) variable length helices with constant diameter and pitch angle (5 to 35 turns). Simplified design relations are given for the antenna gain and half-power beamwidth (HPBW) as a function of axial length L/lambda and circumference C/lambda for helices consisting of approximately 10 turns. Parametric curves are presented to show the gain and HPBW of a constant pitch helix as a function of L/lambda and C/lambda. An empirical expression is derived for the antenna gain as a function of frequency and the helix design parameters. In addition, the bandwidth characteristics are analyzed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1977
- Accession Number
- ADA046487
Entities
People
- H. E. King
- J. L. Wong
Organizations
- The Aerospace Corporation