an issue about Directivity

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microantenna

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this shows the relationship between gain and A,my antenna frequency is 15.6GHz,A=35,4*pi*35/(300/15.6)^2=1.22，convert it to db is a very small value,can anyone tell me how to deal with it,or how to assess the gain of an antenna using its area
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microantenna said:
this shows the relationship between gain and A,my antenna frequency is 15.6GHz,A=35,4*pi*35/(300/15.6)^2=1.22，convert it to db is a very small value,can anyone tell me how to deal with it,or how to assess the gain of an antenna using its area
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The effective antenna aperture Aeff in your equation is not identical to the area of your patch antenna. That only works for horn antennas and similar aperture antennas.
 

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I would not even try to estimate Aeff, and simply simulate gain.

That said, your model looks strange. The patch has a small microstrip notch for microstrip feed that you have not used, and it seems that you try a probe feed instead. From your screenshot it is not clear if that is modelled properly, with only the center conductor passing through the substrate and touching the pad.

I recommend to look again at tutorials on patch antenna modelling.
 

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