SELECTION AND DEVELOPMENT OF AN EXTENDABLE, FLAT, CAVITY-BACKED SPIRAL ANTENNA.
Abstract
The use of flat cavity-backed spiral antennas with diameters of approximately five to ten feet was investigated in conjunction with a space vehicle study. Storage volume limitation during launch necessitated the use of expandable antennas. Thirteen designs were considered, including many which utilize the latest expandable material technology as well as several mechanical designs. The configuration selected for detailed investigation was a spring-actuated erection framework design (extendable arm concept) to which foldable antenna and reflector surfaces are attached. These surfaces are fabricated, typically, of a laminate of Kapton/aluminum/Nomex fabric. The mechanical feasibility of this concept was tested on a simplified 36-inch antenna model. Tests were performed using various erecting member sizes, spring designs, and spring tension levels. A preferred folding sequence for the antenna surfaces was evolved and a method was established for stretching the fabric to provide minimum surface waviness and deflection. High-speed films, which were taken for detailed observation of antenna deployment, permitted incorporation of subsequent design improvements in the prototype. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1967
- Accession Number
- AD0822786
Entities
People
- George Yee
- Richard A. Farran
Organizations
- The Aerospace Corporation