Discussion
Why does the calibration plane matter in an antenna impedance measurement?
Answer: C
Calibration removes the effect of everything between the instrument and the reference plane, so any cable beyond that plane is measured as part of the antenna and rotates the impedance on the chart. Measuring at the instrument port rather than at the antenna is a classic error that makes a bad match look acceptable. Frequency range and delivered power are set by other considerations. Knowing exactly what is included in a measurement is half of interpreting it.
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