cst radiation efficiency

Hi,

I have simulated a simple probe fed circular patch antenna using CST on two different substrate - FR4 and R03010. The resonant frequency (S11) results look fine with both having resonant frequency around 867MHz.

But, I notice that the radiation efficiency / total efficiency from the far field result at the resonant frequency is very low (which leads to very low gain). Therefore, may I know whether I am doing the correct far field simulation? Is there any setting which I have done wrong? Please help.

Attached is the CST file with the results. Thanks.

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