Discussion
In a uniform linear array, what does uniform refer to?
Answer: D
A uniform linear array has elements equally spaced along a line, fed with equal amplitudes and with a constant phase increment from one to the next. That combination gives the highest directivity for a given aperture but also the worst side lobe level, about minus thirteen decibels. Equal cable lengths are one way of achieving equal phase but are not the definition, and the other options describe properties that no array possesses. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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