Extra exam question E4B04
Subelement E4, AMATEUR PRACTICES· Group E4B
E4B04
Which S parameter represents input port return loss or reflection coefficient (equivalent to VSWR)?
- A.S11 (correct answer)
- B.S12
- C.S21
- D.S22
WhyS11 represents input port return loss or reflection coefficient, equivalent to VSWR. S11 represents the input port's return loss, or reflection coefficient, the same quantity that corresponds directly to VSWR at that port, answer A. S12 and S21 describe reverse and forward gain between the two ports, and S22 is the output port's return loss, not the input port's.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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