Accession Number : AD0776542

Title :   Two-Element Quadrifilar Array,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Domer,Frederick R.

Report Date : 08 MAR 1974

Pagination or Media Count : 18

Abstract : Several quadrifilar helices were built and tested, and a three-quarter-turn, quadrifilar helix was selected for use in a two-element vertical array as a fixed satellite ground antenna. A vertical array of two of the helices was then designed and tested. The pattern provided hemisphere coverage and has a fairly sharp cutoff at the horizon to reduce multipath effects. Impedance measurements, polar patterns, and radiation distribution plots of axial ratio, tilt angle, and polarization loss further verify that this antenna is applicable to satellite tracking. (Author)

Descriptors :   *Antenna arrays, Helical antennas, Tracking, Satellite tracking systems, Antenna radiation patterns

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE