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Why antenna factor AF is not maximum at 90 deg when spacing is different from lambda?

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Terminator3

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Hello! I am learning antenna factor for 2d microstrip array (www.antenna-theory.com/arrays/weights/twoDuniform.html). I am using weighs = 1 for all patches. When i am using wavelength spacing dx=lambda, dy=lambda, then AF graph looks okay (maximum at 90 deg). But any spacing different that lambda gives sidebeams. I can provide images later.
 

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