General exam question G9C08
Subelement G9, ANTENNAS AND FEED LINES· Group G9C
What is meant by the “main lobe” of a directive antenna?
- A.The magnitude of the maximum vertical angle of radiation
- B.The point of maximum current in a radiating antenna element
- C.The maximum voltage standing wave point on a radiating element
- D.The direction of maximum radiated field strength from the antenna (correct answer)
WhyThe main lobe of a directive antenna is the direction of maximum radiated field strength from the antenna. A directive antenna's main lobe is simply the direction in which it radiates (or receives) the strongest signal, its direction of maximum field strength, answer D. It isn't defined by a vertical radiation angle, a current maximum point on the element, or a voltage standing-wave maximum, those are different antenna-analysis concepts entirely, so A, B, and C 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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