Hi @rtk - If you want to measure the impedance of an antenna at a specific frequency or at its design frequency you can check the results of the antenna's return loss or S11. If the antenna is matched at this frequency you will see a minimum at this point. You can also look at the Smith Chart to view the input impedance at a specific frequency. In a Smith Chart a perfect 50 ohm match will be at the center of the Smith Chart. If your antenna impedance is not at the value you designed for than a matching network will be necessary.
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