Discussion
What is the Fresnel region of an aperture antenna?
Answer: C
Between the reactive near field and the far field lies the Fresnel or radiating near field, where power flows outward but the pattern has not settled into its final shape. Near field scanners work in it and transform the result. The far field is Fraunhofer, the storage zone is reactive, and the focal region is a separate idea belonging to focused apertures. Naming the three regions and knowing what changes between them prevents most confusion about where a measurement is valid.
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