How to decrease the sidelobe for this antenna array?

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tony_lth

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Hi, Gurus,
I opted an antenna array, as the antenna picture.
And its spec is as the attachemnt sidelobe.
You can notice the sidelobe is only -13dBc. Someone said it better be -15dBc.
So how to config the opt to decrease the sidelobe of the antenna array? Especially the left side sidelobe?
Thanks a lot.
Tony Liu
 

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Decrease a bit the spacing between elements (from λ/2) and the grating lobes should minimize.
 

    tony_lth

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