A freshly calibrated HP8753ES Network Analyzer measured a positive S11 on a passive PCB. The blank PCB will be used for an amplifier, and is composed of input and output matching networks. The only mounted components on the board are 0402 capacitors and SMA connectors. What am I missing?
Thank you SunnySkyguy. I calibrated the VNA to the end of the test cables, and I have SMA connectors soldered directly to the PCB. Do I need to include the SMA connectors in the calibration? If so, how?
Are you seeing positive |S11| using the factory calibration, or user calibration (with passive networks attached)? If the former, then something is either wrong with the instrument or the factory calibration.
I used the Agilent 85033C Cal Kit. When I finished the Cal procedure, I re-checked the short, open and load terminations on the VNA's Smith Chart, and they were correct.
I used the Agilent 85033C Cal Kit. When I finished the Cal procedure, I re-checked the short, open and load terminations on the VNA's Smith Chart, and they were correct.
Sure it matches because you used them for calibration, but I think it's not a broken standard, otherwise s22 would be strange too. Try to change cable and connectors of port 1.