Re: [問題] 請問符號
※ 引述《normanT (門中有心)》之銘言：
: 因為非電機本科 所以在看論文的時候有些符號不知道是什麼東西
: 所以想再這邊請問一下 S11 (11是S的下標)是什麼意思？
: 在這邊給一下前後文
: 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.
簡單的說，你想找到S11是什麼
就去找 two port network（去wiki找最快）
跟two port有關的東西有
S(11,12,21,22)
Y(11,12,21,22)
Z(11,12,21,22)
......
而two port是電子電機很重要的觀念
（雖然現在的電路學跟電子學課程都不太教了）
在研究noise時會常常用到，在做RF、MMIC更是天天會碰到這些
其他相關的還可以找找state space
Smith Chart
Noise Figure
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為什麼那邊那個人那麼傷心呢? ││││││
因為他是北部人啊，吃的比我們還毒哩! 2.5ppm ˍ︵ │││ 還好我們
0.5ppm ◥ ◥ 2ppm ╱ ╱▏ ││ 不用吃…
◤ ◥ ◤ ◥ │￣▏ ˍ 0ppm
| | | ╱ ╱ ﹨
◥◢ ￣ （||） ω ╯ ㄦ
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08/11 09:27, , 1F
08/11 09:27, 1F
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