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In the contexte of my reaserch about antenna conceptions, I'm trying to simulate using CST Microwave a cavity antenna based on metamaterial structure and a slot antenna as a GND,However I got as a results:

  • Total efficiency near to 130%.
  • The impedance decreased from 50 ohm to 28 ohm.

Are those results correct [note that I used a cavity] ? or not?

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    $\begingroup$ Hi there! It might be helpful if you would upload the specific inputs & outputs for your simulation so that you can get specific answers to you question :-) $\endgroup$ – webmarc Oct 16 '20 at 12:43
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Antenna efficiency over 130% would mean a perpetual motion machine, so probably not.

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