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N Element Array

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## N Element Array

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**d**d θ N Element Array**δ=kdsinθ**nδ nδ/2 G M δ/2 δ a A B Phasor Addition**Linear Array**Nulls:**q**D Piston Array Bessel Function J1(pDsinq/l) pDsinq/l J1(pDsinq/l) has zero crossings (nulls) at pDsinq/l = 3.83, 7.02, 10.17, 13.32, 16.47, .... J1(pDsinq/l) has extremes (side lobes) at pDsinq/l = 1.84, 5.33, 8.54, 11.71, 14.86, ....