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HFSS Z parameter anomaly

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EngrN

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Hi all,

I am simulating a pretty simple monopole antenna and aground plane place after a gap. I have simulated the results with waveport and lumped port - got VSWR = 1.6, and required gain patterns but when I check the Z11 - real and imaginary , I get around 0+5j. What have I done wrong? I need the input impedance of the antenna.

Please advise.
 

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