dirac16
Member level 5
Hi there;
I am new to the ADS layout tool. I have a simple impedance matching circuit for which I want to plot the input reflection coefficient and check whether it agrees with the EM simulation performed on the generated layout. Below is the single stub matching circuit created using MLINs to match a ZL=100+75j to a 50 Ohm line.
The center frequency is set at 1GHz. As is expected the magnitude of input reflection coefficient should approach ~0 at 1GHz. Running a schematic simulation and plotting S(1,1) the result is simply verified.
Now in order to prepare for Momentum simulation I generated the layout as shown below.
I then went to the EM menu and chose Simulation Setup. In the pop-up window I created a new substrate with the same characteristics as MSUB1. In the Ports setting I set Port1=50 Ohm and Port2=100+75j. In the Options setting I also activated Edge mesh to increase accuracy near the edges. Then I ran S simulation and it ended without any warning or errors. The following diagram for S(1,1) is plotted:
Quite weirdly the center frequency has now shifted to ~1.65GHz. I am not able to physically justify the result because it doesn't make sense at all. I am really stuck at what made this happen. Does anyone know what's going on here?
I am new to the ADS layout tool. I have a simple impedance matching circuit for which I want to plot the input reflection coefficient and check whether it agrees with the EM simulation performed on the generated layout. Below is the single stub matching circuit created using MLINs to match a ZL=100+75j to a 50 Ohm line.
The center frequency is set at 1GHz. As is expected the magnitude of input reflection coefficient should approach ~0 at 1GHz. Running a schematic simulation and plotting S(1,1) the result is simply verified.
Now in order to prepare for Momentum simulation I generated the layout as shown below.
I then went to the EM menu and chose Simulation Setup. In the pop-up window I created a new substrate with the same characteristics as MSUB1. In the Ports setting I set Port1=50 Ohm and Port2=100+75j. In the Options setting I also activated Edge mesh to increase accuracy near the edges. Then I ran S simulation and it ended without any warning or errors. The following diagram for S(1,1) is plotted:
Quite weirdly the center frequency has now shifted to ~1.65GHz. I am not able to physically justify the result because it doesn't make sense at all. I am really stuck at what made this happen. Does anyone know what's going on here?