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Drawbacks of the normal mode of radiation in helical antenna are _______

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Drawbacks of the normal mode of radiation in helical antenna are _______

(a) low radiation efficiency and narrow bandwidth

(b) high radiation efficiency and narrow bandwidth

(c) low radiation efficiency and Broad bandwidth

(d) high radiation efficiency and broad bandwidth

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This intriguing question comes from Frequency Independent Antenna topic in division Frequency Independent Antenna of Antennas

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Correct option is (a) low radiation efficiency and narrow bandwidth

Explanation: In normal mode, the radiation is perpendicular to axis. 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.

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