Discussion
Why is a plane reflector behind a dipole less effective than a corner reflector?
Answer: C
A single plane gives one image and about three decibels of gain, whereas the two planes of a corner produce three images whose combination gives ten decibels or more. Size, polarisation and spacing are not the distinguishing factors, since a plane reflector must also be a wavelength or two across and preserves polarisation in the same way. Counting images is the quickest route to understanding any reflecting geometry made of flat conducting sheets.
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