I cannot believe I cannot find a solution!
I am trying to find a way of calibrating small tiny semirigid coax cables ( 1.2mm diameter ) for measuring S param. on RF boards populated with 0402 components. I tried soldering one end of this semirigid on a SMA connector already mounted on RF board, to use it as a reliable way of connecting my calibration kit and use it for reflection calibration.
Then I use a semirigid coax cable ( both ends SMA terminated ) to calibrate the trasmission, but at the end of calibration procedure, the measurements I took, differ a lot from "clasical calibration" ( the one which is using just simple coax cables ).
Where am I wrong ? What is going on?
ADS said that is very difficult to calibrate such stuff on 8753E unless I am using an additional software.
Please advise. Your help will be greatly appreciated.