Question
What do the subscripts of S parameters represent?
Answer Options
- A) The port or ports at which measurements are made
- B) The relative time between measurements
- C) Relative quality of the data
- D) Frequency order of the measurements
Correct Answer: A
Explanation
S-parameters are always noted using the notation S_{ij}, where the two subscripts hold specific meaning related to the input and output ports of the device being measured. This notation is standardized across all RF engineering to clearly indicate the signal flow direction.
The subscripts of S parameters represent the port or ports at which measurements are made. The first subscript, ‘i’, denotes the output port where the signal is measured, and the second subscript, ‘j’, denotes the input port where the stimulus (source signal) is applied. For example, S_{21} means a signal input at Port 1 and measured at Port 2.
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