Discussion
How is impedance measured on a modern antenna?
Answer: B
A vector network analyser sweeps the band and reports complex reflection coefficient, provided it has been calibrated with known standards at the plane where the antenna connects. The slotted line is the classical method it replaced and is still instructive. Power comparison and resistor substitution do not give phase. The essential discipline is that the calibration plane must be where the measurement is meant to apply, or the cable becomes part of the antenna.
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