Discussion
What is a polarisation efficiency?
Answer: A
When the incident and receiving polarisations differ, only part of the available power is captured, and that fraction is the polarisation efficiency, unity for a perfect match and zero for orthogonal linear polarisations. A linear antenna in a circular field captures half, which is the familiar three decibel loss. The other options describe cross polar discrimination and component performance. A mismatch loss that depends only on the geometry of two vectors is easy to compute once it is recognised as such.
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