olemus
raadiosageduslikku kiirgust tõkestav varjestus
= electromagnetic shielding used for blocking radio frequency interference

ülevaateid
https://en.wikipedia.org/wiki/Electromagnetic_shielding

https://incompliancemag.com/article/the-basic-principles-of-shielding/

https://www.digikey.ee/en/articles/techzone/2013/jan/rf-shielding-the-art-and-science-of-eliminating-interference