Discussion
What is a compact antenna test range?
Answer: A
A shaped reflector illuminated by a feed collimates the wave so that a plane wave front exists across a quiet zone only a few metres away, allowing far field measurement in a room. It replaces distance with optics. Measuring at half the far field distance would simply give wrong results, portability is not the definition, and scaling the frequency changes the antenna under test rather than the range. Near field scanning with a mathematical transformation is the other standard answer to the same problem.
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