# special kind of 1D grating lobe formula

#### yef smith

Joined Aug 2, 2020
366
Hello, I have an array with only 9 elements. need to find its grating lobe formula.
i was told that the formulas shown bellow are for very large N.
the last expression is for very large N?
is there more accurate formulas for grating lobes with N=9 (not very large number)

maybe i am confusing something ,but i was told that there is another formula for grating lobes specific for finite number of elements.

basicly i was told that this textbook formula is for college tasks and for real world array design there more considerations.
what other consideration i need to think consider when designing the distance between elements?
thanks.

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