measure impedance of differential antenna

hi,

i have a differential dipole antenna (86.5+j43) and would like to measure its S-parameters. im using ADS momentum in my simulation.
1. how to use standard network analyzer to measure S-parameter?
2. do i need calibration for the different input port impedances?

thanks[/b]

I believed you need to be clearer. What is your refernce impedance?

I dont think you design your antenna for 86.5 +j43 ohm rite?

Usually it is either 50 or 100 ohm for most system.

In that case you calibrate accordingly.

Added after 59 seconds:

Sorry I mean either 50 or 75 ohm not 100 ohm. Typo.

To measure the impedance of a dipole using a standard Network Analyzer you need a balun (balanced to unbalanced)