sool83
Newbie level 3
ads cpw
Hi everybody!
I need to simulate some microwave circuits in coplanar waveguides by using ADS Momentum 2006. I prefer to use STRIPs instead of SLOTs even thought simulation is demonstrated to be more efficient with SLOTs, since I generally start from masks or .gds file.Then, I use 2 metallic strips as ground planes and one strip between them as RF line. I set two opposite ports as "internal" and the other two couples of ports as "ground reference", obviously referred to the rispective internal port.
I noticed that S-parameters results from a full wave simulation of a simple 50 ohm CPW (for istance, 1 mm of length) are different from the CPW lumped element provided by the schematic tool of ADS. These results are different also from measurement results!!! In fact, I usually try to simulate a complex structure in Momentum (i.e. suspended bridge, discountinuities, transitions, ecc..) and it seems to be coherent with measured data, but if there are some simple CPW path, I need to simulate the whole structure by exporting full-wave S-parameters in the Schematic and by adding CPW lumped elements where needed, rather than simulating CPW path directly in Momentum. Otherwise, simulated data are different from measured data!! You can verify my assertion by designing a simple CPW line (using Strip and not Slot!) in Momentum and comparing it with an equal length CPW lumped element.
Did I make some mistakes in preparing the model? Is there anyone among you who has ever encountered this kind of problem?
thank you in advance!
Hi everybody!
I need to simulate some microwave circuits in coplanar waveguides by using ADS Momentum 2006. I prefer to use STRIPs instead of SLOTs even thought simulation is demonstrated to be more efficient with SLOTs, since I generally start from masks or .gds file.Then, I use 2 metallic strips as ground planes and one strip between them as RF line. I set two opposite ports as "internal" and the other two couples of ports as "ground reference", obviously referred to the rispective internal port.
I noticed that S-parameters results from a full wave simulation of a simple 50 ohm CPW (for istance, 1 mm of length) are different from the CPW lumped element provided by the schematic tool of ADS. These results are different also from measurement results!!! In fact, I usually try to simulate a complex structure in Momentum (i.e. suspended bridge, discountinuities, transitions, ecc..) and it seems to be coherent with measured data, but if there are some simple CPW path, I need to simulate the whole structure by exporting full-wave S-parameters in the Schematic and by adding CPW lumped elements where needed, rather than simulating CPW path directly in Momentum. Otherwise, simulated data are different from measured data!! You can verify my assertion by designing a simple CPW line (using Strip and not Slot!) in Momentum and comparing it with an equal length CPW lumped element.
Did I make some mistakes in preparing the model? Is there anyone among you who has ever encountered this kind of problem?
thank you in advance!