I am designing a PCB for a Bluetooth 5 device using Qualcomm chip and a Murata BP filter. The RF circuit is composed of:
- an SMT antenna that has a 50 Ohm unbalanced feed point impedance,
- a Murata 2.45GHz Bandpass filter that has a characteristic nominal impedance of 50 Ohm
- a BT IC which has a 50 Ohm port impedance for BT_RF.
ANTENNA>>---(1 w/ P1&P2)--->>BP Filt>>---(2 w/ Pi-LC)--->>BT_RF
With all these components having a 50 Ohm impedance, how should I design the PCB traces (1) and (2) and their matching networks? Should (1) and (2) individually have a 50 Ohm impedance or should the whole transmission line from SMT antenna feed point to BT_RF have a 50 Ohm impedance?