I am designing a compact custom BLE board with the MKW41Z controller for wearable application. I have some recommendations from the antenna datasheet on the RF matching circuit and also the 50 Ohm transmission line impedance matching from the NXP FRDM-KW41Z schematic.
Of course I have replaced the "J5 and ANT1" part of the circuit from the FRDM-KW41Z schematic with the Molex MID SMT antenna [with its recommended 1.3pF and 1.8nH RF matching circuit].
And routed the PCB as close as possible to the recommended working layout in the application notes:
My problem is I cannot figure out a specific trace width to use on the RF trace from the MCU ANT pad to the antenna
If I was to pick a PCB manufacturer who makes PCBs using FR4 boards of a specific dielectric constant, board thickness and top copper thickness, like OSHPark 2oz Copper with 0.8mm FR4, how do I figure out the width of the trace required and distance between the trace and the top ground plane. I need to fix this final part in order to do via stitching and make prototypes. Any assistance will be greatly appreciated.