I am designing a PCB with the transceiver SX1231 (868MHz) with a SMA connector for the antenna. I don't know much about antennas. I would like to know if there is some parameters I need to be careful to keep the circuit adapted (to reduce reflections of the signal's power).
In another PCB that a friend developed, I see a lot of Vias (a bunch of them, one after the other) around the pads of the SMA connector, what is the reason of this?
Do I need to consider the width of the traces that connect the capacitors and inductors between the transceiver and the SMA connector? How can I calculate this? Do I need to take in consideration the material of the PCB?
Is there something I need to take in consideration about the ground planes?
Thanks for your help.