COMPACT H-F AIRCRAFT ANTENNAS (2-30 MC)
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 1/5-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 1/5-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 1/5-scale exploratory and the full-scale advanced development models were written and delivered during this period.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1966
- Accession Number
- AD0481712
Entities
People
- J. H. Hendershot
- R. K. Thomas
Organizations
- Glenn L. Martin Company