Create a 3-port S-matrix for a circulator with the following characteristics:

- follows the unitary condition

- has a return loss at each port of 23 dB

- isolation is equal to 23 dB

- S11=S22=S33

- S21=S32=S13

- S12=S23=S31

- |S11|=|S22|=|S33|=|S12|=|S23|=|S31|