Question
Which of the following can be measured by a two-port vector network analyzer?
Answer Options
- A) Phase noise
- B) Filter frequency response
- C) Pulse rise time
- D) Forward power
Correct Answer: B
Explanation
A Vector Network Analyzer (VNA) is designed to measure the frequency domain performance of components by characterizing their input and output signal scattering (S-parameters). It measures how a signal is reflected and transmitted through a device as a function of frequency and phase.
Because the VNA sweeps a test signal across a range of frequencies and measures the complex transmission coefficient (S_{21}), its core capability is measuring the magnitude and phase response of linear components. This means it can precisely measure a filter’s frequency response, including its passband, stopband rejection, and ripple characteristics, which are derived directly from the measured S_{21} parameter across the test frequencies.
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