How to use the Wizfi310_CON with an external antenna

Hello,

I am currently using the Wizfi310_CON, with the SMA connector built in.

For a new design, we want to use an external antenna on the PCB where the module is going to be soldered.

In the Wizfi310 datasheet it is stated that “if you want to use an external antenna, please contact Wiznet before designing the circuit”.

What do I have to take into account to design it?

Best Regards.