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What is space diversity on a microwave link?

  • A.Two links following geographically separated routes to the same place
  • B.Two antennas pointing in different directions from the same site
  • C.Two polarisations received simultaneously on one antenna
  • D.Two receiving antennas at different heights on the same tower

Answer: D

Vertically separated antennas experience different path differences to the reflection point, so when one is in a fade the other generally is not, and combining or switching between them restores availability. Route diversity, sector antennas and polarisation diversity are different arrangements serving different purposes. Diversity works only where the two signals fade independently, and vertical separation on a reflective path is one of the situations where that independence is reliable.

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