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Which of the following instrument measures the amplitude and phase of the signal?

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Which of the following instrument measures the amplitude and phase of the signal?

(a) Network analyzer

(b) Spectrum analyzer

(c) Oscilloscope

(d) Klystron

This question was addressed to me at a job interview.

The above asked question is from Spectrum Analyzer in chapter Modern Antennas & Antenna Measurements of Antennas

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The correct option is (a) Network analyzer

To elaborate: Network analyzer is used to measure the amplitude of signal and phase over a frequency. Spectrum analyzer which is a frequency domain instrument gives the plot of signal amplitude versus the frequency. Oscilloscope is a time domain instrument. Klystron acts as a source for the microwave signal.

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