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Thanks, but I plot |s11| in dB and it is lower than 0 on the whole frequency band, I don't think it is |s11| that causes the problem, also all the projects that work well show the same problem, it maybe impossible they all go wrong...
Hi, I use HFSS to draw impedance smith chart and get a strange chart, from previous post somebody also meet with such problem and said it was due to |s11|>1, in my case I don't think so,because all my simulation projects show such strange chart...
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