Accession Number:

AD0235571

Title:

Scanning Techniques for Large Flat Communication Antenna Arrays

Descriptive Note:

[Technical Report, Technical Report]

Corporate Author:

AERO GEO ASTRO ALEXANDRIA VA

Report Date:

1960-01-31

Pagination or Media Count:

74

Abstract:

This report is a summary of the scientific progress on scanning techniques for large flat communication arrays during the first half of an eighteen-month study. The effort has been divided into experimental and theoretical projects. The experimental program has included phase shift techniques in open two-wire line and enclosed transmission line. The most promising results have been obtained with a circularly polarized coaxial configuration using the TE11 mode. Theoretical studies have been made in three areas - circularly polarized phase shifters, multiple beams from linear arrays, and elimination of broadside resonance in traveling-wave arrays. It has been found that any circularly polarized component should be fed by a hybrid junction, the fourth output being terminated to absorb any reflected waves. Multiple-feed systems for arrays have been analyzed, and networks for connecting N inputs to N elements are presented, N being limited to 2 exp 1 3 exp m. A method for eliminating the broadside resonance in traveling-wave arrays in which the junction may be separated from the element is described. A tentative program for completion of the scanning systems study is given.

Descriptors:

Subject Categories:

  • Radio Communications

Distribution Statement:

[A, Approved For Public Release]