Question

Which of the following are frequency independent antennas?

a.

Dielectric rod and Yagi

b.

Log-periodic and Equiangular Spiral

c.

Half-wave dipole and Half-wave slot

d.

Axial mode helix and Pyramidal horn

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Answer: (b).Log-periodic and Equiangular Spiral Explanation:Log-periodic and Equiangular spiral antennas are frequency independent antennas. Log – periodic antenna operates over the range 10 MHz – 12 GHz. Equiangular spiral operates over the range 100 MHz – 35 GHz.

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