FREQUENCY-SELECTIVE ELECTROMAGNETIC INTERFERENCE (EMI) SHIELDING MATERIALS TO BE USED IN THE SPACE ENVIRON
Abstract
In the space environment, the active space aircrafts and satellites have various threats of not only hostile and hazardous space weather, and risk of collision with space debris, but also electromagnetic (EM) pollutions. In performing space missions, the core control systems of the Space Situational Awareness (SSA) sensors, navigation, communication, etc. are vulnerable to the adversaries, and thus they should be protected effectively. We believe that it could be achieved by covering the exterior surface of installed parts and assembled devices using electromagnetic interference (EMI) shielding materials directly on site. For this purpose, we propose a smart and robust EMI shielding materials with frequency-selective absorption capabilities, which could endure extremely-hostile temperature cycles. The composite system contains a mixture of two types of spherical skin-core beads, where the densely crosslinked polymer-core bead is covered with either diffuse reflecting material ( conductor@bead ) or wave-absorbing material ( absorber@bead ). In addition, we would like to propose a spray coating methodology, to apply the materials to the satellite’s parts installed in a highly integrated manner in a limited space, which could ensure a continuous coverlay. Since the EMI shielding coverlay is in touch with various materials having different coefficient of thermal expansion (CTE), most likely resulting in altered shielding frequencies, anisotropic signal jamming, mechanical delamination, permanent deformation, etc., the peel-off stress analysis and prediction will be conducted for the design of the EMI shielding coverlay. Conclusively, the fundamental research proposed in this proposal will provide a significant knowledge that the precisely controlled fillers could give a frequency selective EMI shielding characteristics based on a wide spectrum of material selection and structural speculation of composite materials to be used in the space environment.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2023
- Source ID
- FA23862210041
Entities
People
- Jae-Do Nam
Organizations
- Air Force Office of Scientific Research
- Sungkyunkwan University
- United States Air Force