I cannot change the substrate material and its height. I have kept the flaring angle around 30 degrees and pitch as 4.7mm and diameter of via holes as 1mm. I tried adding dielectric loading but there was not any significant change in the gain? Currently I am getting negative gain, what changes can I do so that I get a gain of at least 3-5db?

I have also attached the hfss file, can anyone help me please?

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