ELECTRICAL AND ENVIRONMENTAL TEST OF MATERIALS USED ON THE PENCIL BEAM REFLECTOR OF THE REINS ANTENNA
Abstract
Tests were conducted to determine the amount of water absorption and its effect on the electrical properties (the dielectrc constant and loss tangent) of the materials presently used on and the materials proposed for the pencil beam reflector of the Reins antenna. The 3 types of materials tested were designated as types A, B and C. Type A material was NOPCO Lockfoam A-603 with fire retardant added. One layer of 0.004 inch thick fiberglass was bonded to 2 parallel surfaces with Epocast 2 epoxy resin. These 2 surfaces represent the front and back surfaces of the Reins pencil beam reflector. Type B samples were the same as type A except the bonding agent was polyurethane resin. Type C sample was the same as type B except that only one surface representing the outer surface of the pencil beam reflector was covered. All of the samples were sealed on all surfaces with their respective resins. The results of the tests were that the type A samples exhibited a 2.0% change in dielectric constant while types B and C exhibited 0.8% and 0.3% change, respectively. The % change in the weight of these samples was 2.6% for type A, 0.8% for type B, and 0.3% for type C. The percent change in thickness was 2.2% for type A, 1.6% for type B and 1.4% for type C. The loss tangent measurements are also presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1961
- Accession Number
- AD0259647
Entities
People
- James R. Taber
Organizations
- General Dynamics