I am using the Quectel M95 GPRS Modem on my PCB. The hardware reference guide says "pin 39 is the RF antenna pad. The RF interface has an impedance of 50Ω."
I am using a u.efl connector and connecting a QuadBand PCB antenna to the connector. The antenna spec says impedance: 50 ohm.
Now I am confused. My layout designer is saying the manufacturer has to put a 50 ohm trace for the u.efl connector while manufacturing.
There is a Pi circuit on the PCB for RF tuning. How do I use that?
For now only a 0R is put there, but if tuning is required the values were to be put in accordingly.
If the antenna already has 50 Ohm impedance, why does the PCB trace also have be to 50 ohm?