Discussion
What is scan blindness in a phased array?
Answer: C
At certain scan angles, a surface wave supported by the array structure couples strongly and the active reflection coefficient approaches unity, so almost no power is radiated. It is a resonance of the whole periodic structure rather than a failure of any element. Grating lobes are a distinct problem caused by element spacing exceeding about half a wavelength, and physical obstruction and feed cancellation are not the mechanism. Both effects limit the usable scan volume.
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