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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 hornThe question was posed to me in class test.My doubt stems from Antenna Tradeoffs topic in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio

Answer»

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.



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