leander
Newbie level 5
Hi, every one,
When simulating inductors in HFSS, there is a ground ring surrounding the inductor, providing a return loop for the ports. This ground ring is required especially when the two ports are placed in different side.
I found that the result is very sensitive to the size of the ground ring. The inductance decreases when shrinking the ground ring. I guess that maybe it is because there is current on the ground ring induced by the central inductor, and this current degrades the inductance. When the size of ground ring increase, the effect will be diminished. So that I set the ground ring to be very large, but the result is much larger than reasonable (I have computed the same structure by analytical formula and other solvers).
How can I get a reliable result in HFSS?
In my HFSS simulation, I followed a design kit developed by Ansoft and UMC:
**broken link removed**
Here is a brief introduction:
**broken link removed**
When simulating inductors in HFSS, there is a ground ring surrounding the inductor, providing a return loop for the ports. This ground ring is required especially when the two ports are placed in different side.
I found that the result is very sensitive to the size of the ground ring. The inductance decreases when shrinking the ground ring. I guess that maybe it is because there is current on the ground ring induced by the central inductor, and this current degrades the inductance. When the size of ground ring increase, the effect will be diminished. So that I set the ground ring to be very large, but the result is much larger than reasonable (I have computed the same structure by analytical formula and other solvers).
How can I get a reliable result in HFSS?
In my HFSS simulation, I followed a design kit developed by Ansoft and UMC:
**broken link removed**
Here is a brief introduction:
**broken link removed**