What are floating conductors?
Floating conductors are standard signal line conductors that physically exist and modify the fields in the structure, but whose input and output terminals will not be accessed in any subsequent circuit simulation and thus need not appear in the output RLCG matrices. For example, a structure with three signal lines and one reference plane gives rise to a 3-by-3 C matrix. If one of the signal lines is specified as floating, the resulting matrix is only 2-by-2. This reduces clutter in the analysis procedure. Whether the 3-by-3 matrix or the 2-by-2 matrix is used in a subsequent circuit simulation, the voltages and currents on the non-floating lines will be identical, but the voltages and currents on the floating lines can be observed only in the analysis where all lines are specified as non-floating. Floating lines can be placed in parallel, either in one or several groups, by properly assigning group numbers.
