The unbalanced interface of a VNA is not very well suited for measuring balanced circuits like antennas, transmission lines or chip impedances. In fact it is nearly impossible to get a decent calibration on a balanced 2-port measurement using coax cables.
MegiQ has created a toolkit that contains a unique system of balanced adapters and a balanced calibration kit. A pinheader to connect to the circuit is part of the calibration so that we are measuring at the very tip of the pins. Calibration is even quicker than with our UFL calibration kit.
Check out our Balanced Calibration Kit