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1. Your lumped port was too big. Look at the picture for a proper lumped port.
2. Your frequency sweep was improperly set for the radiation boundary, since it was 7.5mm from the structure -> solution frequency from 10GHz and above, so for the 7.5GHz the radiation boundary was too close
Either enlarge the radiation boundary (airbox), or change the sweep to 10-15GHz.
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