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Microstrip patch antenna representation as an array of two slots

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yefj

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hello,from the article bellow we can see the microstrip antenna as an array of two radiating slots which are separated by half a wavelength As shown in the photo bellow.these Electric fields cause magnetic current in the same direction at every slot.

Why becase of the same magnetic direction we get a stronger radiation pattern? i cant see it in the equation bellow. Why we get constructive sum of both radiations? Thanks. https://www.ece.mcmaster.ca/faculty/nikolova/antenna_dload/current_lectures/L21_Mstrip2.pdf

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