Changes
/* Exciting Multiport Structures in EM.Cube */
where the incident and reflected power waves a<sub>i</sub> and b<sub>i</sub> are related to the port voltage and current in the following manner:
:<math> a_i = \frac{V_i + Z_i I_i}{2\sqrt{|Re(Z_i)|}} , \quad\quad b_i = \frac{V_i - Z_i^* I_i}{2\sqrt{|Re(Z_i)|}} </math>
For the computation of the S-parameters in [[EM.Tempo]], the source associated with each port is excited separately with all the other ports turned off. Due to the existence of internal source resistances, tuning the other sources off is indeed equivalent to terminating the other ports in their characteristics impedances (matched ports). When the jth port is excited, all the S<sub>ij</sub> parameters are calculated together based on the following definition:
:<math> S_{ij} = \sqrt{ \| \frac{|Re(Z_i)|}{|Re(Z_j)} \| } } \cdot \frac{V_j - Z_j^*I_j}{V_i+Z_i I_i} </math>
where V<sub>i</sub> is the voltage across Port i, I<sub>i</sub> is the current flowing into Port i and Z<sub>i</sub> is the characteristic impedance of Port i. The sweep loop then moves to the next port until all ports have been excited. The other parameters are then calculated as:
