Skin depth question

  • Thread starter Thierry12
  • Start date
  • #1
25
0

Main Question or Discussion Point

I placed a cellphone in 2 half-spheres that i closed afterwards to create a metal cavity (aliminium 1mm) and called it (with another cellphone). The phone rang even if it wasn't supposed to considering the skin effect (wavelenght were about 0,04m and i couldn't see any holes). Anyone has a clue why?
 

Answers and Replies

  • #2
mgb_phys
Science Advisor
Homework Helper
7,774
12
RF can get through very small gaps.
When you said you 'closed them' unless you made an airtight seal (difficult without some fancy machining) you didn't really close them.
Cell phones are designed to pick up very-very weak signals.
 
  • #3
1,041
4
When you're designing enclosures for EMI/EMC, particularly at those frequencies, aluminum touching aluminum doesn't count. You have to use things like contact fingers, solder, mechanical pressure, conducting gels, and so on.
This link will give you some considerations and examples
http://www.cotsjournalonline.com/home/article.php?id=100057 [Broken]
 
Last edited by a moderator:
  • #4
25
0
Next time i will close them proplerly! ty
 

Related Threads for: Skin depth question

  • Last Post
Replies
1
Views
490
Replies
3
Views
538
Replies
3
Views
4K
Replies
3
Views
2K
Replies
3
Views
562
Replies
4
Views
675
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
9
Views
8K
Top