Discussion
How is a broadside array excited?
Answer: A
Feeding every element in phase makes the contributions add in the direction perpendicular to the array line, where all path lengths are equal, giving the broadside beam. A progressive phase matching the inter-element delay gives end fire instead. Antiphase excitation produces a null broadside, and amplitude tapering is a side lobe control applied on top of whichever phase distribution is chosen. Phase decides where the beam points; amplitude decides what the side lobes look like.
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