I have created an 5.8GHz patch antenna with complex impedance for my research (in CST MW Studio). But I have got a problem with the efficiencies (see picture). I think it's because the antenna is complex, but the port is not. I have already created a matching network (in schemetic) so the s-parameter seems to be good now. But how do I do the same with the efficiency so that it is matched for the complex antenna? Thank you in advance.

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