Author Topic: How to distinguish cell/wifi/bt/gps/nfc antennas with only eyes and multimeter?  (Read 309 times)

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Offline 5au12Topic starter

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Many phones/tablets or other devices don't have a reliable source of schematics, is it possible to tell each antenna's purpose myself?
 

Offline ftg

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I think the only even semi-reliable way is with a VNA and a pile of adapters. Even then the antennas are meant to work with the device closed and in hand.
THere is a chance that the NFC antenna will show a few ohms resistance instead of open or dead short, as it is likely a fairly large coil with some matching to resonate it on 13.56 MHz.
But all other antennas can be either open or shorted to ground, depending on their construction.
It does not help that all of them are multiband antennas.
 


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