S-parameter graph showing S23 and S32 for the original design  

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... Wilkinson power divider were simulated in RFSim99 to determine the ideal performance. Fig. 2 gives the value for S11 and S12.Since the port for measurement was named as 1 and 2 for ports 2 and 3 respectively, we have S12 for S23 of the Wilkinson schematic. We observe the value of S23 to be around -55.91dB at the operating frequency. The graph in Fig. 3 shows that the results for S23 and S32 are essentially identical, further demonstrating the reciprocal nature of the Wilkinson. The frequency at which the isolation reaches a maximum value is approximately 1.8 GHz equal to the operating frequency of the divider. ...