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@redfast00
redfast00 committed Jan 14, 2024
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Expand Up @@ -24,7 +24,7 @@ I also tried putting my phone in a (turned off!) microwave, but this did not wor
# Proper Faraday cage

While researching on how to build a proper Faraday cage that is also affordable, I came across the paper 'Building and Testing an Economic Faraday Cage for Wireless, IoT
Computing Education and Research' that seemed pretty good: for 793&nbsp;USD, they built a Faraday cage with data and power passthrough: they accomplished the data passthrough by using an Ethernet-to-fiber converter; they accomplished the power passthrough by using buying a used power line filter from a MRI chamber. Simply explained, the paper proposes having two cabinets: an inner cabinet, covered in conductive fabric except where the door is, and an outer one, where the door is covered in fabric, sealing against the inner cabinet when the door is closed. If this is not entirely clear, don't worry, I'll have pictures later.
Computing Education and Research' that seemed pretty good: for 793&nbsp;USD, they built a Faraday cage with data and power passthrough: they accomplished the data passthrough by using an Ethernet-to-fiber converter; they accomplished the power passthrough by using a second-hand power line filter from a MRI chamber. Simply explained, the paper proposes having two cabinets: an inner cabinet, covered in conductive fabric except where the door is, and an outer one, where the door is covered in fabric, sealing against the inner cabinet when the door is closed. If this is not entirely clear, don't worry, I'll have pictures later.

There are, in my opinion, some flaws in that paper:

Expand Down Expand Up @@ -105,7 +105,7 @@ The weakest signal my wireless dongle could still receive was -81&nbsp;dBm. The
| copper pipe, 15mm outer diameter, 1m (although you only need about 0.5m) | 10.99 | |
| hinges (could likely also be 3D printed) | 7.78 | |
| (optional) handles for outer cube | 10.69 | |
| wood screws; I used 4mm × 40mm for outer MDF cube; 4mm × 60mm screws for inner cube<br>I didn't have any wood screws before this project, so I bought in bulk for future projects<br>the 10 EUR here is an upper bound estimate | 10 | |
| wood screws; I used 4mm × 40mm for outer MDF cube; 4mm × 60mm screws for inner cube. I didn't have any wood screws before this project, so I bought in bulk for future projects. The 10 EUR here is an upper bound estimate | 10 | |
| foam tape: I used 20 mm width × 3 mm height × 10 m length tape | 7.45 | https://web.archive.org/web/20240113175203/https://www.amazon.com.be/dp/B09KBH7WT1 |
| conductive fabric, 3× 110 cm by 91 cm. I used TitanRF fabric, this was the only fabric that came with a test report | 84 | https://web.archive.org/web/20240113174610/https://www.amazon.com.be/-/nl/Darkness-Military-geleidende-RF-signalen-Bluetooth/dp/B01M294MGK/ |
| conductive tape; 2.54 cm × 3.05 m | 12 | https://web.archive.org/web/20240113174817/https://www.amazon.com.be/-/nl/TitanRF-Faraday-Tape-High-Shielding-RF-sluitingen/dp/B07CRLCGCH/ |
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