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Far from an antenna the power density falls as

  • A.the inverse cube of the distance
  • B.a constant
  • C.the inverse square of the distance
  • D.the inverse first power of the distance

Answer: C

The power spreads over a spherical surface growing as the square of the radius, so the density falls accordingly and the field amplitude as the inverse first power. This is the free space path loss that every radio link budget begins with.

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