Discussion
Assertion (A): A thick dipole has a wider impedance bandwidth than a thin one.
Reason (R): Increasing the conductor diameter lowers the Q of the resonant structure.
Select the correct answer from the options below.
Answer: A
Both are true and the second is the reason. A fatter element has a lower ratio of stored to dissipated energy, so the impedance varies more slowly with frequency and the useful band widens. The same idea explains cage dipoles, biconical antennas and the whole family of broadband structures, whose common feature is a large effective diameter. The limiting case is the biconical antenna, whose impedance is frequency independent because its geometry is defined entirely by angles.
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