Retrofit Louvers for Suppression of EM fields from an Enclosure
Publication Date: 2013-Jul-09
The IP.com Prior Art Database
Described is a new louver configuration that, in one polarization, suppresses the radiated emissions from a source located within an enclosure. The configured louvers both reflect and absorb the radiated emissions while allowing air flow for thermal relief.
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Frequencies utilized, in current and future systems, continue to get higher in the frequency range. The result of this is existing devices used to reduce these higher emissions from the system do not work as well as they do on emissions from lower frequencies. To get these existing devices to lower these higher emissions can require an excess of the devices to be used, which could increase the cost to be prohibitive to the system. This invention could eliminate the excessive amount of the existing devices that would be required to lower the emissions from the systems.
The louvers shown are arranged such that the impending electromagnetic plane wave first encounters an off axis 45 degree reflection. This reflection vectors the energy towards the upper or lower RF absorbing material that covers the surface of the louvers that face the oncoming radiation. The energy that reaches the short edge of the pattern is diminished by the absorber and diffused. The energy that travels along the longer edge is diminished and pointed downward. Part of the advantage of the pattern is that the emission itself is diminished and pointed downward towards the floor forcing the received measured energy to be reflected from the floor. The overlapping of the short and long edge forces the impending wave to strike an RF absorber surface before passing through the barrier. The trade off, of course, is in the length of the louvers. Longer louvers provide more attenuation along its length....