因为非电机本科 所以在看论文的时候有些符号不知道是什麽东西 所以想再这边请问一下 S11 (11是S的下标)是什麽意思？ 在这边给一下前後文 This section considers a simple interconnect example for which the generation of a macromodel fails. We present the example under the standpoint of the design engineer, who knows the physical geometry of the interconnect and is required to generate a SPICE-compatible model in order to carry out the design. The structure is a three-conductor transmission line. Its scattering matrix is first computed over a bandwidth of 4 GHz using a commercial frequency-domain 3-D field solver. Then, the various scattering matrix entries are processed by the very popular and robust vector fitting (VF) algorithm [3] in order to produce a lumped model for the structure. It is well known that VF produces a model in poles-residues form, which is readily synthesized into a SPICE netlist. It turns out that VF fails to provide a reasonably accurate model. As an example, we report in Fig. 1 the original return loss S11 and the corresponding response of a rational model with 20 poles. Although the raw data are quite smooth, the model is very inaccurate. --

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