Extra exam question E9E03
Subelement E9, ANTENNAS AND TRANSMISSION LINES· Group E9E
What matching system uses a short length of transmission line connected in parallel with the feed line at or near the feed point?
- A.Gamma match
- B.Delta match
- C.T-match
- D.Stub match (correct answer)
WhyA stub match uses a short length of transmission line connected in parallel with the feed line at or near the feed point. A stub match uses a short length of transmission line connected in parallel with the main feed line at or near the antenna's feed point, its length and position tuned to cancel unwanted reactance and bring the impedance to the desired match, answer D. Gamma, delta, and T-match systems use different matching mechanisms, they don't rely on this specific parallel stub arrangement.
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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