i have problem with the simulation of Wilkinson splitter at 1847MHz. I can't set TFR properly in ADS momentum. Schematic Simulation works well with lumped 100ohm resistor. But i cant get same result in Momentum. How can i set TFR sheet and at which location it must be placed.
I guess you can make it more simple. Do as Agilent do in Momentum tutorials: place two additional ports at the places where you suppose to connect resistor.Simulate it and convert to layout component. Put it into schematic and connect your resistor to relevant ports. Simulate at schematic.
Why? For the layer with your thin film resistors, you can set the sheet resistance (ohm/square) in the Momentum substrate settings.
One example for resistive sheet can be found here: examples > Momentum > Microwave > ThickCond_Spiral_prj
If there's anything I learned from designing these dividers, is that's that layout you have is horrendous. There is too much coupling between your two lambda/4 branches being side by side like that, ideally you want them as isolated as possible. Consider a circle - not only do you have good isolation, but the resulting divider is also more wideband.
Do i need other softwares such as Ansoft designer , microwave office etc along with ADS, for accurate combiner design?
Is it possible to implement using lumped elements for combiner at 900MHz and 1800MHz.
You are right. using the other software may be usable when the degree of power splitter is high and one want to optimize the resistor values.
I think that the optimizer of different software do not work similar.
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For designing power splitter i do as this procedure:
1. determine the degree
2. design in circuit simulation
3. analyze in momentum software. with setting ports at two pins of any resistor
4. export the sNp file, and simulate with resistor.
You are right. using the other software may be usable when the degree of power splitter is high and one want to optimize the resistor values.
I think that the optimizer of different software do not work similar.
i have problem with the simulation of Wilkinson splitter at 1847MHz. I can't set TFR properly in ADS momentum. Schematic Simulation works well with lumped 100ohm resistor. But i cant get same result in Momentum. How can i set TFR sheet and at which location it must be placed.