Specifications

FPC antenna specification
You can see antenna size is 33.92mm*15.56mm* From below
Specification.
Please refer to the chart below for PCB size of RF line terminal.
Scrape a GND off the side of the J12 ,J13 and ANT2,connect the FPC antenna to the PCB at the
position of the J12 ,J13 and ANT2 connector.
[The line between the FPC antenna and the WiFi module] must be 50 ohm.
C57 ,C58 and C197 are 0R resistors.