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Negative port impedance

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Hi All,

I am currently doing some antenna modeling. The antenna is excited by a 50 Ohm coaxial port. I get reasonable S11 results at resonance but the lumped port impedance is negative e.g. -5 Ohms. This doesn't comply with the S11 value and how can a port impedance become negative at all?

Meshing?

Cheers
Edgar


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