https://blog.naver.com/sekiho007/222708703855
아마존에서 파는 상품도 있네요.
https://www.amazon.com/Shielding-Bluetooth-MILITARY-SHIELDING-CONDUCTIVE/dp/B01M294MGK/ref=sr_1_9?crid=34DBQUM1EV8GR&keywords=faraday&qid=1679106662&sprefix=faraday%2Caps%2C345&sr=8-9&th=1