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Microstrip patch antenna inset feed width -HFSS

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Vagish Rajan

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Hi,
We designed a microstrip patch antenna using HFSS having the following parameters shown in fig.
fig1.png
In this fig, when the inset distance is varied slightly ie even by 0.001mm also, the impedance decreases drastically.
This could be pretty dangerous when manufacturing the antenna is in question.
Is there any solution for this?
Thanks in advance.
 

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