Question: Sketch a rough polar power density plot for a coherently excited linear array composed of 16 square elements, each 1 mm wide with a center-to-center

Sketch a rough polar power density plot for a coherently excited linear array composed of 16 square elements, each 1 mm wide with a center-to-center spacing of 2 mm. The frequency is 2.25 MHz. Calculate the following three important features: width of the main lobe; angular positions of the grating lobe(s); and ratio of peak power density in first grating lobe to peak power density in main lobe

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