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In which of the following mode, the helical antenna has narrow bandwidth?(a) Normal mode(b) Axial mode(c) Beam mode(d) End-fire modeThis question was addressed to me by my college director while I was bunking the class.This key question is from Frequency Independent Antenna topic in chapter Frequency Independent Antenna of Antennas

Answer»

Correct option is (a) Normal mode

Explanation: The radiation pattern of a helical antenna is a COMBINATION of small dipole and loop antenna. In normal mode of radiation, it provides NARROW BANDWIDTH and low radiation efficiency. AXIAL mode is ALSO known as beam mode or end-fire mode.



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