Compensation of antenna tilt of radiation pattern

Hi all
i am desining a kind of antenna array in multilayer structures 6x6 elements
i have a problem with the total gain/radiation pattern.
it has 12 degree tilt i want to keep the broadside beam in 0 degree
How can i compensate this 12 degree?

Thanks in advance for your answer
Mohamed

This is a common issue on most of the two-dimensional arrays where all the antenna elements are fed from a single side.
For example, a multi-patch array antenna with all the patch elements fed from their bottom side.
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSfxoRyGQrekBnsDK07aNeNUY8xGEhh1Md8OQ&usqp=CAU
If look to the antenna pattern of a single antenna element is hard to see any change of the pattern from an ideal broadside shape (even there is a very small change due to the feed). But when put together many patches into an array, the overall array pattern change from an ideal broadside, mainly due to the multiplied pattern, but also due to different coupling between antenna elements (due to the antenna feed position).
Array pattern = Element pattern x Array factor.

An option to compensate for this tilt in the pattern, is to change the shape of all elements. Also the coupling between neighbor antenna elements should be verified.
Generally a patch antenna have the width W greater than the length L (mainly to improve radiation), but I've seen many patch arrays using the patch dimensions in the other way (L>W), just to compensate this array tilt.
https://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Feedingstrips.jpg/1200px-Feedingstrips.jpg
If your array is not made from patch elements, also have to think to the elements shape and feed.

Thanks vfone for your valuable answer.
Do think that i have to change the shape of all elements?
i was thinking to change the shape and/or orientation of some elements of the only the last row in my case the 6th row

Yes, you can try tuning only few elements of the array. Changing a bit the elements shape is recommended because changing the element orientation (or their spacing) usually results in increasing the grating lobes. Spending some time with the EM simulator is inevitable in this case.

Thanks vfone for your kind reply.
i have 6 x6 elements and i used to have in the x-direction for example half wavelength distance between the elements.
but what about the distance between the elements in the y-direction i started form the minimum distance between each two elements which depend on the patch size.
or should i also keep this distance as half wavelength too?

To get minimum grating lobes on elevation the distance between antenna elements should be half wavelength also in Y direction.