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56 DESIGN007 MAGAZINE I JUNE 2025 been carried out to prove that this material can have a dual function as a resonance attenuator and as an element to direct the heat flow from inside the cabinet to the outside. e calculated, simulated, and tested data in most cases differ by 1–7% error, and a significant reduction in resonances has been demonstrated. Extending the frequency range of these cavities will make a difference for IoT applications, 5G, and future functionalities that require the use of a higher frequency range. Introduction e technological development over the past decades has been unprecedented, starting in the 2000s with phones just capable of making calls, to the present day, with augmented real- ity glasses, hyper-connectivity, and high-speed devices. To achieve this development, it has been necessary to design the hardware of all operating systems to be smaller and more opti- mal. Consumers and the technology industry demand higher portability, faster speeds, and high-quality performance. With this chal- lenge in mind, and assuming that designs will not only remain as they are, but will become smaller and smaller, the industry faces a major challenge of EMI. Industry is no longer talking about eliminat- ing electromagnetic interference effects, but rather, assuming that such problems will occur, looking for a method to mitigate their effect. Many designers are opting to include shielding cabinets, a product used to isolate components from EMI. However, this solution may not be 100% effective at certain frequencies, resulting in a resonant cavity effect and therefore not achieving the desired isolation. Background When talking about shielding, the first term that oen comes to mind is the Faraday cage. At low frequency, the electrons can move suf- ficiently far between the peak and valley of the wave to allow a redistribution of charge: an electric field appears which opposes the exter- nal one, achieving a zero electric field in the region surrounded by the screen. However, in this work, the ranges of inter- est are high-frequency ranges, so the elec- trons do not have as much freedom of move- ment, and therefore, the Faraday cage effect is much smaller. In these frequency ranges, two main effects must be considered: reflection and absorption, and secondly, the absorption inside the cavity walls must be considered. DESIGN007 To read this entire paper, which was presented at the Pan-European Electronics Design Conference in Vienna, Austria, click here.