Discussion
What limits the useful upper frequency of a terrestrial microwave link?
Answer: B
Above about ten gigahertz rain begins to attenuate seriously, and specific absorption bands of oxygen and water vapour add further loss, so link availability rather than equipment capability sets the limit. Antenna gain and available bandwidth both improve with frequency, and receiver noise temperature is manageable. The design response is shorter hops, higher fade margins and site diversity, which is why millimetre wave links are measured in hundreds of metres rather than tens of kilometres.
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