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In which of the following mode, there are no minor lobes at oblique angles in radiation pattern?

(a) Normal mode

(b) Axial mode

(c) Conical mode

(d) Beam mode

This question was addressed to me in semester exam.

This intriguing question comes from Frequency Independent Antenna in portion Frequency Independent Antenna of Antennas

1 Answer

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Correct choice is (a) Normal mode

Best explanation: In normal mode of radiation, it provides narrow bandwidth and low radiation efficiency. In Axial mode of radiation, the radiation is in end-fire direction along the helical axis. The radiation pattern of the antenna is broad, directional along axis and produces minor lobes at oblique angles.

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