||This thesis presents a time-domain numerical simulator of using transmission line and equivalent-circuit model to obtain scattering parameters of the test section. The ports of the test section are connected with transmission lines. A time-domain pulse is given into the input port for extracting the properties of the system with a matched load added at the terminal of each transmission line. With this simulator, the incident and reflected waveforms at the input port, and transmitted wave at the other ports can be achieved. A Fourier-transform approach is applied to transfer the input, reflected, and transmitted waveforms from the time domain into frequency domain to obtain the frequency responses. The S parameters and the characteristics of the system including reflection and transmission coefficients can be obtained. Examples of two-port, three-port, and four-port networks are investigated in this thesis to confirm the feasibility. The results obtained from the simulator are compared with results from some alternative approaches such as AC-analysis method and show precise accuracy of this methodology.|
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