General exam question G9C01
Subelement G9, ANTENNAS AND FEED LINES· Group G9C
Which of the following would increase the bandwidth of a Yagi antenna?
- A.Larger-diameter elements (correct answer)
- B.Closer element spacing
- C.Loading coils in series with the element
- D.Tapered-diameter elements
WhyLarger-diameter elements would increase the bandwidth of a Yagi antenna. Using larger-diameter elements on a Yagi lowers the element's Q, which flattens out how sharply its reactance changes with frequency, broadening the range of frequencies over which the antenna stays reasonably matched, answer A. Closer element spacing, series loading coils, and tapered-diameter elements are generally used to adjust gain, physical size, or mechanical requirements rather than specifically to widen bandwidth, so B, C, and D are wrong.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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