Hi all,
I measured a circuit with input/output SMA connectors. But the measured results are much different from (worse than) the simulation results using WavePort.
To find out the reason, I compare the simulation results between WavePort(rectangular), LumpedPort, and Coax(using waveport).
I found the measured results are much similar with the simulation results using Coax excitation (waveport on coax face).
The Discontinuity from the SMA connectors to the PCB board causes impedance mismatch and result in the worse reflection coefficients (S11).
Is the Discontinuity ONLY reason for the worse performance?
The simulation results using WavePort is reliable or not?
The problem is that if the WavePort (rectangular) is correct and reliable, we cannot measure it since the connectors must be used.
The simulation results are attached for review. Thank you very much.
jianke