Metal covers on wifi chips

Discussion in 'Wireless & RF Design' started by electrophile, Feb 4, 2016.

  1. electrophile

    Thread Starter Member

    Aug 30, 2013
    100
    1
    I'm looking at a couple of low-cost Wifi modules that work with Arduinos. I was wondering what purpose does the metal cover on the board serve? (with the WiFi consortium markings). I'm guessing they cover the chip from physical damage but do they also act as an antenna? I've attached a few images I found off Sparkfun and Aliexpress. I've found it on almost all Wifi modules that are available on the market.

    Screen Shot 2016-02-04 at 16.48.36.png 13345-06.jpg
     
  2. ISB123

    Well-Known Member

    May 21, 2014
    1,239
    527
    They block EMI.
     
  3. electrophile

    Thread Starter Member

    Aug 30, 2013
    100
    1
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