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Which of the following cannot be the separation between elements in a broadside array to avoid grating lobes?

Which of the following cannot be the separation between elements in a broadside array to avoid grating lobes? Correct Answer 4λ/2

The spacing between elements should not equal to integral multiples of λ to avoid grating lobes. The option 4λ/2=2λ So when d=2λ grating lobes occurs which means maxima are found at other angles also. So this is not a desired spacing.

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