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The Thru Response after Calibration

Question asked by garypang on Aug 18, 2011

Attached herewith the thru response after calibration. The response is taken when the Port 1 and Port 2 are probing at a "thru" pad of a calibration substrate.

Do anyone know why the S11 and S22 are not the same at the low frequency. Its about 20dB difference. Will that difference bring significant effect to the measurement results later?

Thank you and hope that someone can help in this matter.