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Explain operating modes of helical antennas.

Mumbai University > Electronics Engineering > Sem 5 > Electromagnetic Engineering

Marks: 4 Marks

Year: Dec 2014

1 Answer
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There are two operating modes of helical antenna-

  1. Normal mode of radiation – In normal mode the maximum radiation is in the direction normal to the axis of helix and minimum along its axis for this mode the dimension of helix must be small compared to the wavelength i.e D << λ.

  2. Axial mode of radiation – In axial mode of radiation, the maximum radition is in the direction of axis of helix.

    For axial mode pitcg angle (α) varies from 12° to 18°.

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