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The type of dipole antenna that has a higher band width is called as?

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The type of dipole antenna that has a higher band width is called as?

(a) Conical antenna

(b) Yagi antenna

(c) Helical antenna

(d) Marconi antenna

I had been asked this question during an internship interview.

This is a very interesting question from Types of Antenna topic in division Antennas and Wave Propagation of Avionics

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The correct choice is (a) Conical antenna

The explanation: A common way to increase bandwidth in the antenna is to use a version of the dipole antenna known as the conical antenna. The overall length of the antenna is 0.73λ or 0.73(984)/f = 718.32/f. This is longer than the traditional one-half wavelength of a dipole antenna, but the physical shape changes the necessary dimensions for resonance.

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