aparture coupled patch antenna bandwidth problem

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yef smith

Joined Aug 2, 2020
348
Hello,I have tried to create a wideband patch antenna using aparture coupled feeding.
e_r=2.2 and h=0.787mm was used for both layers with the measues shown bellow for central frequency of 10GHz.
I have tried to use bowtie and straight slots and to play with the width .
but nothing makes it wide band.
In one manual i red that one layer needs to be with higher dielectric constant then the other.
but i cant see why?
how can i physicaly investigateusing current of field to see where exactly did i go wrong in the aparture coupling mechnism?
Thanks

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