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Antenna & Wave PropagationDirectivity & Gain

The directivity of an isotropic radiator is?

  • A1 or 0 dBi
  • B2 or 3 dBi
  • C1.64 or 2.15 dBi
  • DInfinite
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Correct Answer: A. 1 or 0 dBi
Explanation: By definition, an isotropic radiator has directivity 1, corresponding to 0 dBi.
Reference: Standard antenna and wave propagation: directivity & gain
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