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Frequency Response damping with external voltage supply

Question asked by jaz on Nov 14, 2011

I have designed PCB Traces with a Tee connection. One input is for AC signal input (with blocking capacitor) and another is for DC signal input (with blocking inductor). Both AC and DC signal combines and enters my DUT. Similar concept as in Bias tee. However, the frequency response is damping. I do not get smooth/flat response as shown in the attached file. I have simulated the circuit prior of designing and i do not find any damping problem. May i know what is the possible reasons this occur and any method to troubleshoot this problem?