Accession Number:

AD0481712

Title:

COMPACT H-F AIRCRAFT ANTENNAS (2-30 MC)

Descriptive Note:

Semi-annual rept. 21 Jul 1965-21 Feb 1966

Corporate Author:

MARTIN CO BALTIMORE MD

Personal Author(s):

• Hendershot, J. H.
• Thomas, R. K.

Report Date:

1966-02-01

Pagination or Media Count:

23.0

Abstract:

The program effort is concerned with the design and development of a broadband, compact, omnidirectional airborne antenna in the H-F communications range 2 to 30 Mc. The antenna will be used on several U. S. Army aircraft, both fixed and rotary wing. The antenna element configuration is a loop-type structure intended to induce currents on the airframe for a predominantly vertical polarized system. All work on the 15-scale exploratory development model antennas has been completed. Impedance, pattern and relative gain measurements have been thoroughly investigated. The selected element configuration for the H-F Compact Antenna is a 2-turn grounded loop. The major effort was spent on the gain measurements of 15-scale antennas relative to a 3- ft monopole. An element size reduction to a 2-turn loop from an original 4-turn loop was justified from the measured gain data. The application of ferrite to the H-F antenna was considered. Measured field strength of a matched transmitting coil, with and without ferrite material, is presented. A full-scale breadboard model antenna of the 2-turn loop was fabricated. Preliminary impedance tests were made, and a successful marriage power test with the automatic tuner was performed. The test plans for the 15-scale exploratory and the full-scale advanced development models were written and delivered during this period.

Descriptors:

• *AIRCRAFT ANTENNAS
• *OMNIDIRECTIONAL ANTENNAS
• *LOOP ANTENNAS
• HIGH FREQUENCY
• GAIN
• ELECTRIC CONNECTORS
• ANTENNA FEEDS
• FERRITES
• ARMY AIRCRAFT
• ELECTRICAL IMPEDANCE

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE