Characteristics of 5- to 35- Turn Uniform Helical Antennas
AEROSPACE CORP EL SEGUNDO CA IVAN A GETTING LABS
Pagination or Media Count:
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 Llambda and circumference Clambda 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 Llambda and Clambda. 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.
- Electrical and Electronic Equipment