HFSS15: Alignment Groups for Waveports with Multiple Modes

When assigning wave ports for modal solutions, alignment groups can be used only for a consecutive block of degenerate modes with each block of modes identified by a unique group number. There may be modes at the end of the modes table which have no assigned alignment group, but no unassigned modes in the middle of a block of degenerate modes containing an alignment group definition. Finally, each mode with an alignment group must have an integration line.

Alignment groups allow the solver to collect the modes within a group and ensure that each mode has non-zero voltage on its own integration line and zero voltage on every other integration line in the group. If the modes in a group are not degenerate or its defined integration lines are not appropriately defined, hf3d will terminate with an error message.

Any change in the mode groups will cause invalidation of solutions but not of the mesh.