This article lists the restrictions and limitations when using the planar multilayer substrate (infinite or finite).
Tip: A finite planar multilayer substrate is when a planar multilayer substrate is confined to a region.
Solution methods and planar multilayer substrates
| Solution Method | Planar Multilayer Substrate |
| Infinite | Finite |
| MoM (SEP) | Yes | Yes |
| MoM (VEP) | No | No |
| MLFMM | No | Yes |
| FEM | Yes | Yes |
| FDTD | No | No |
| PO | No | No |
| LE-PO | No | No |
| RL-GO | Yes (if confined to the uppermost layer of the substrate) | No |
| UTD & faceted UTD | No | No |
| ACA | Yes | Yes |
| Low-frequency stabilisation for MoM | No | No |
| DGFM | No | No |
| Periodic boundary conditions | No | No |
| CBFM | No | No |
| Cable | No | No |
| MFIE, CFIE | No | No |
The following media are not supported in conjunction with the planar multilayer substrate:
- Dielectric and magnetic cuboids
- Windscreen and layered dielectrics
The following ports and sources are not supported in conjunction with the planar multilayer substrate:
- Waveguide port
- Spherical mode source
- Solution coefficient source
The following restrictions apply when using planar multilayer substrate:
- A reflective ground plane in the model is not supported in conjunction with a planar multilayer substrate.
Note: A ground plane may be defined in the layers of the planar multilayer substrate.
- A mesh element must be located within a single layer of the planar multilayer.
- A mesh element may not intersect a ground plane in the planar multilayer.
- A dielectric triangle may not lie on the interface (boundary) between substrate layers.
- An aperture triangle must coincide with a planar multilayer substrate PEC ground plane.
