I'm struggling with impedance matching on a small PCB we have designed for a 2.4GHz MIFA antenna. I assume my issues come from bad calibration of the VNA.
I've attached the RF path schematic and a picture.
I've removed all of the components from the RF path, then I've attached a semi-rigid cable to C5's pads.
I've calibrated the VNA by connecting to the cable, putting 0 ohm resistor at L2, and then using C43 as Open\Short\Load. After which I placed Short again and added time delay to set the Smith Chart.
Once done with calibration I put 0 ohm resistors on L4 and C46 and start the impedance match, however the PI filters that I'm using do not move the Smith Chart according to theory (not even close).
Am I doing something wrong or is there something wrong with my approach?