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

Answer 1

Correct answer is (b) Log-periodic and Equiangular Spiral

To elaborate: 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.