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As chucky suggested, using directional coupler is the usual and effective way to measure S-para.
According to my experience the impedance of a PA is not wildly power dependent. The impedance doesn't vary much when the measured input power does. So that: bias stage 1 -> measure S11 and S22 and...
The EM simulation (red line) is not much different from the simulation of the schematic (dash line).
The result seems good to me. But I am not sure the simulated result is correct, if the momentum mesh doesn't fit?
Hi guys,
I am trying to simulate the characteristics of a branch-line coupler in EM simulation. However, the momentum mesh doesn't fit the layout (the upper edge marked in attached picture). No matter how many cells/wavelength are used or other options in Mesh tab of simulation options are set...
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