I recently came across a phone (Samsung Galaxy Grand Prime SM-G530f) with trouble getting any network signal, I did some troubleshooting and ended up finding out that one of the pin(the GSM pin) to the antenna was torn and it ripped two traces connected to it, I have never worked on any antenna related task before therefore this was new to me.
I googled and found the schematics for the phone in order to see where the traces lead to, but I am not able to make sense of how the antenna is connected to the motherboard.
Here are the pins that connect to the antenna + the antenna (I don't have the phone right now so I am using the closest images I could get for context)
The pin ANT101 (GND pin) is supposed to be ground which makes sense but what I can't figure out is the ANT102 pin (GSM pin) , it seems to me that it is also essentially connected to the ground and any circuitry beyond it is useless.
How then is the signal from the antenna received?, is this how all antennas are connected?
The full schematics are available here for anyone interested, page 25 and 27 show the complete Antenna circuitry.