Abstract
Abstract. Metallic rooms as part of a complex system, like a ship, are necessarily connected electromagnetically via apertures and cables to the outside. Therefore, their electromagnetic shielding effectiveness (SE) is limited by ventilation openings, cable feed-throughs and door gaps. Thus, electronic equipment inside these rooms is susceptible to outer electromagnetic threats like IEM (Intentional Electromagnetic Interference). Dielectric or magnetic absorber inside such a screened room can be used in order to prevent the SE from collapsing at the resonant frequencies. In this contribution, the effect of different available absorber materials is compared, as well as other properties like weight and workability. Furthermore, parameter variations of the absorber as well as the effect of loading in form of metallic and dielectric structures on the SE are analyzed.
Highlights
Empty, perfectly conducting and cuboid rooms or enclosures, resonances are excited by external fields at the frequencies c m2 n2 p2
Different absorber materials are compared with respect to their damping property, flammability, workability, weight and price
The inner back side is tiled with a layer of different absorber materials: polyurethane-carbon foam, ferrite tiles and two different types of ferrite composite absorber
Summary
Empty, perfectly conducting and cuboid rooms or enclosures, resonances are excited by external fields at the frequencies c m2 n2 p2. A cuboid screened enclosure with dimensions of 40 cm is analyzed in the frequency range of 400 to 1000 MHz via simulation and measurement. It is illuminated by a TEM wave which couples in through an aperture at its front side. Knowledge about the dielectric and magnetic properties of the absorber materials is necessary This is provided by a reflection and transmission measurement inside a coaxial transmission line. Different parameter variations of the absorber like thickness and number are carried out in the frequency range from 40 to 100 MHz. the impact of metallic and dielectric loading inside the enclosure on SE is determined
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