Far-Field Electromagnetic Interference (EMI) Shielding Using Aperture-Controlled Skin-Core Beads Composite
Abstract
Electromagnetic interference (EMI) shielding is the final defense for EMI problems that could impact almost all electrical and electronic systems from daily life to military activity and aerospace exploration. Although metallic barrier has been used for EMI shielding as a most popular way, it cannot ultimately eliminate EM waves but reflect and/or redirect them, which may very well impact the surrounding devices or bounce back to the detectors in the case of counter system development. Therefore, we believe that the EM-wave reflecting materials should be used along with the EM-wave absorbing materials to eliminate the reflected EM waves. For this purpose, we propose a mixture of two types of spherical skin-core beads, where the core bead is covered with either diffuse-reflection material (conductor@bead) or wave-absorbing material (absorber@bead). The spherical beads are quite advantageous in the task of EMI shielding because they redirect the waves repeatedly among the adjacent beads in the random direction until the EM wave sinks into the absorber. Furthermore, according to the theory of aperture shielding, the incident wave will be selectively prevented by the size-controlled aperture barrier, which can be ensured by the conformational arrangement of packed beads. The packed beads will be embedded in UV- or microwave curable high-performance polymers, which would substantially increase the long-term durability of the EMI-shielding cover layer. Conclusively, we propose here a fundamental research on two different types of skin-core bead and the EMI shieling aperture of the bead incorporated composite providing a wide spectrum of material selection and fundamental knowledge in the various EMI shieling issues.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 06, 2022
- Accession Number
- AD1189155
Entities
People
- Jae-Do Nam
Organizations
- Sungkyunkwan University