Hi,
So this is a project that's on its second iteration, having trusted the previous PCB designer and ending up with some expensive PCB-shaped coasters, have learned quite a bit myself and also asked for help from another more experienced engineer. Looking for some feedback on this RF feedline and antenna area:
- Murata RF connector with integrated switch (MM81302600) - for inserting the VNA and tuning the PI network
- PI network
- Extra in-series 0402 footprint (C14/C15) to route the signal to J3 (UFL connector), in case I want to use an external antenna instead of the one on the PCB.
- Chip antenna: 2450AT42A100
Thanks!
You make some serious mistakes in this circuit.
-Antennas are never connected in parallel because RF cannot be considered low frequency.Instead, you should use a Antenna Switch to change over the antennas
-Similarly using a Connector on the Antenna Path is not a good idea because it will disturb the Characteristic Impedance of the Transmission Line.In additional to, VNA Measurements will also be very erroneous due to Loading Effect of the IC. You have to separate the Path by using-for instance- directional coupler.Or another switch..
-Layout does not conform the RF specifications. You designed it as usual Low Frequency circuit.I don't know which IC you intend to use but if there are some TL specifications about Output Circuit, you should track that because TL might be a part of Matching Circuit.