iPhone4 Disassembly - What is this part?

[Pogopuschel]

Hey,

I *tried* to disassemble my iPhone to get out a stuck SIM card. The good news is, I got the SIM card. The bad news, my WiFi doesn't work anymore. Now, while I took the phone apart some part unintentionally came off and I have no idea what it is, where it's supposed to be, or if it's even related to the WiFi problem. See the following picture.

Any ideas??

 

[Gav2k]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)

http://www.ifixit.com/Teardown/iPhone-4-Teardown/3130/1

Step 6