How to separate PCB antenna and SMA connector?
They usually put a 3-pad solder jump.
The central pad is connected to the LORA integratated circuit.
The left pad is connected to your SMA connector.
The right pad is connected to the printed antenna.

Look at this example:


Please note that your antenna is not a patch antenna.
It's just a PCB printed antenna where the PCB works as a mechanical support.