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Thanks for the hint to add ports at the point to be grounded. So I added those ports, then defined a very small port impedance there (near 0 ohm, can't put exactly 0 ohm). And now my s11 and s21 look as expected.
Really wish the layout tool would understand that if a point is connected with a...
I'm trying to simulate a microstrip stub matching network with short-circuited stub in Keysight ADS.
In the schematic, I use the MLIN component for transmission lines, MTEE for the junction, and MLSC for the short-circuit stub (I also tried a combination of an MLIN + ground instead but the...
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