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Convergence is a concept in simulators. Are you using a simulator? When it evaluates your circuit, it runs the values through calculations, and repeats the process, until it converges on a stable output (for that timeframe). Then the simulator goes on to calculate the next timeframe.
If it cannot reach convergence, then it creates an error.
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'Poor' convergence suggests your circuit (or settings you chose) is causing incorrect results.
I have a problem when simulating my structure using HFSS. It keeps giving me the warning : poor convergence in computing port despersion.
When i do simulations, i do not find major effects to the changes i add to antenna structure. Can this be due to the poor convergence in computing port despersion? does it prevent HFSS from finding the correct results? how can i get rid of this problem?