Accession Number : AD0822786

Title :   SELECTION AND DEVELOPMENT OF AN EXTENDABLE, FLAT, CAVITY-BACKED SPIRAL ANTENNA.

Descriptive Note : Rept. for May-Dec 65,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA EL SEGUNDO TECHNICAL OPERATIONS

Personal Author(s) : Farran, Richard A. ; Yee, George

Report Date : JUL 1967

Pagination or Media Count : 30

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)

Descriptors :   (*SPIRAL ANTENNAS, SPACECRAFT), EXPANDABLE STRUCTURES, SPRINGS, EXTENDABLE STRUCTURES, LAMINATES, MODEL TESTS, INFLATABLE STRUCTURES, DISKS, EXPANDED PLASTICS, SANDWICH CONSTRUCTION, ALUMINUM, FOILS(MATERIALS).

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE