real life distance between elements consederation in phased array for beam steering

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yefj

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Hello, i have built a 1D phased array with certain radiation pattern which is fed by passive
i want to create a 2D from my 1D phased array by connecting 9 such columns together so i will have a 2D pattern.
we need to steer my radiation pattern of the 1D array at most +-30 degrees.
so basicly i have and array of 9 elements.
but i was told that the grating lobe formula shown bellow is not enough,that in real life there are more considerations for
choosing the distance between 1D arrays?
What are they?
Thanks.
 

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