Tag Archives: Faraday Cages

Protecting Electronics with Faraday Cages

I have done a lot of research on Faraday Cages and feel like I am finally beginning to understand them. A Faraday Cage is designed to protect electronics from EMP (electromagnetic pulse) that can be created by high altitude nuclear explosions or solar storms.  See  previous posts on EMP. Some simple examples of Faraday cages are shown below.

  • A booster bag (shopping bag lined with aluminum foil) acts as a Faraday cage. It is often used by shoplifters to steal RFID-tagged (radio-frequency identification) items.
  • The cooking chamber of a microwave oven is a Faraday cage, made to contain the RF (radio-frequency) signals of the cavity magnetron which cooks the food.
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