Question on how Q3D calculate CG matrix

- June 10, 2022 at 6:02 pm
  
  yuxuan.wu
  Subscriber
  
  Hello,
  I am currently trying to extract some cable parameters using Q3D, but I am confused by how Q3D generates the CG matrix. The capacitance extraction should correspond to the potential differences between conductor and shield mathematically. However, in my simulation, I did not see any difference in the CG matrix of my Conductor and Shield neither the shield floating nor being assigned Sink and Source of the surface for parameter extraction.
  Therefore, I am wondering if the CG matrix is voltage-dependent or if it only depends on the geometrics of the cable layout values. And if it is voltage-dependent, what is the correct way to perform the simulation.
  I hope someone can help me better understand the theory behind the Q3D. Thanks ahead!
- September 28, 2022 at 4:14 pm
  
  Charlotte Blair
  Ansys Employee
  
  Hi Yuxuan,
  You can find more details in the Q3D Documentation under
  Q3D Extractor Technical Notes > RLGC Parameter Matrices > Capacitance Matrices
  The calculation is both voltage and geometry dependent.
  Regards,
  Charlotte