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Microstrip Dual Band Antenna Directivity Problem HFSS

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metrika

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Hello,

I am trying to design dual band microstrip patch antenna but I calculate very low directivity, gain values. I am trying to solve this for few days but I couldn't. Could you please help me?

Thanks...

View attachment Ansoft.rar
 

You need to increase the Ground plane size to increase the directivity. I changed the expression to -30*h + PatchX
 

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