Discussion
Why is a triangular lattice sometimes preferred to a rectangular one in a planar array?
Answer: D
The triangular arrangement packs the array's spatial frequency cells more efficiently, so about thirteen per cent fewer elements cover the same scan volume without grating lobes. On an array of thousands of modules that is a substantial saving. It is rather harder to lay out and feed than a rectangular grid, side lobe level depends on the taper, and element bandwidth is a property of the element. Efficiency in element count is the whole justification.
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