routh
Newbie level 4
The VNA I was trying to calibrate is with N-type output port and I added an N-type to SMA adaptor so the cal kit can be applied. What I am trying to do is a SOL full one-port calibration over the band of 2.3-2.6GHz.
After I completed the cablibration, I put the O and S cal kit back to the port that had been calibrated and found the S11 of open and short are not at 0 and 180 degrees on the Smith Chart. However, they are at -90 and -270 degrees accordingly, which means rotating clockwise.
Another thing is when I did the same calibration over the band of 230-260MHz, everything looks ok. The S11 of open and short sits where it should be.
What is the possible reason for this problem?
Can it be because the calibation kit is not good enough? (The kit I am using is not from the manufacturer of the VNA)
Or there is something wrong with the VNA, which needs to be inspected?
Thanks.
After I completed the cablibration, I put the O and S cal kit back to the port that had been calibrated and found the S11 of open and short are not at 0 and 180 degrees on the Smith Chart. However, they are at -90 and -270 degrees accordingly, which means rotating clockwise.
Another thing is when I did the same calibration over the band of 230-260MHz, everything looks ok. The S11 of open and short sits where it should be.
What is the possible reason for this problem?
Can it be because the calibation kit is not good enough? (The kit I am using is not from the manufacturer of the VNA)
Or there is something wrong with the VNA, which needs to be inspected?
Thanks.