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54 DESIGN007 MAGAZINE I JUNE 2025 (Editor's note: is paper was presented at the Pan-European Electronics Design Conference in Vienna, Austria, in January 2025.) Abstract Inherent cavity resonant modes oen lead to significant degradation of shielding effective- ness, responsible for unwanted electromag- netic coupling. Cavity resonant modes of the metal shielding enclosure can produce two adverse problems: the mutual coupling among different RF modules and shielding effective- ness reduction of the metal enclosure. e cab- inets serve to shield certain components from electromagnetic interference (EMI). How- Study on Resonance Mitigation in Metallic Shielding for Integrated Circuits ever, these cavities present some resonance peaks at 5 GHz, making it impossible to use them at higher frequencies. By incorporating absorber sheets inside the lid of the cabinet, these resonances are attenu- ated or even eliminated, allowing the use of the cabinets as a protective element in PCB at higher frequencies. In this study, it has been calculated theoretically, simulated using a commercial EM field solver, and tested in the laboratory in differ- ent cabinets to find their resonance frequencies, as well as tested incorporating a ferromagnetic material inside them to see if this can help to attenuate the effect of resonances. In addition, thermal simulations and laboratory tests have Article by Maria Cuesta-Martin, Victor Martinez, and Vidal Gonzalez Aguado WÜRTH ELEKTRONIK, WALDENBURG, BADEN WURTTEMBERG, GERMANY