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Stripline Differential Pair

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本文始於2009年筆者初入SI、PI領域時,使用Ansoft HFSS v10.0完成操作,模擬步驟與說明較為簡略,也沒有附上範例檔。2012年重新以HFSS v14.0撰寫本文,並附上範例檔供學習參考。此例的重點在了解Driven Terminal下wave port + de-embed使用,與differential pair的odd mode、even mode field,並做特性阻抗最佳化求解。
  • Get Started
  • Create 3D Model
  • Create Wave Port Excitation
  • Analysis Setup
  • Create Reports-- SDD11 plot-- Export S-parameter
  • Create Field Overlay
  • Design Optimize
  • Animate Field Overlay
  • Export Differential S-parameter
  • Transfer Diff. S-parameter to Single-end S-parameter
  • 問題與討論11.1 De-embed有什麼優點?11.2 在HFSS中,如何觀察Zin(從port往系統網路看)、埠端阻抗(port Zo)與傳輸線特性阻抗(Zo)?11.3 為何此例在HFSS內模擬時,不需要設background (air box)? 又此例stripline的reference plane在哪裡?11.4 什麼時候用wave port,甚麼時候用lump port?此例如果改成lump port,結果會不會相同?11.5 如果step3.3不用de-embed,而是真正建一段線長1000mils的傳輸線取代本例100mils線長+900mils de-embed,結果相同嗎?
  • 參考資料


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  • Get Started
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    1.1 Setting Tool OptionsToolsOptionsHFSS Options: 被複製的幾何形物件,默認有一樣的邊界特性

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    ToolsOptionsModeler Options:

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    1.2 Open a new project:FileNew如果希望一開啟HFSS就已經有一個new project,請從ToolsOptionsGeneral Options:

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    1.3 Set Solution Type:HFSSSolution Type, choose [Driven Terminal] for this example

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    讀者可以用Help搜尋[Solution Type]的說明:[Driven Mode] is for calculating the mode-based S-parameters of passive, high-frequency structures such as microstrips, waveguides, and transmission lines which are "driven" by a source, and for computing incident plane wave scattering. The S-matrix solution will be expressed in terms of the incident and reflected powers of waveguide modes.[Driven Terminal] is for calculating theterminal-based S-parameters of passive, high-frequency structures with multi-conductor transmission line ports. This solution type results in a terminal-based description in terms of voltages and currents. [Eigen Mode] is for calculating the Eigenmodes, or resonances, of a structure. The Eigenmode solver finds the resonant frequencies of the structure and the fields at those resonant frequencies. Eigenmode designs cannot contain design parameters that depend on frequency.[Transient] is for calculating problems in the time domain. It employs a time-domain "transient" solver. Typically applications include (The mode appears from HFSS 13)
    1.4 Set Model Units:ModelerUnits, select "mil"


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    小心不要選錯成[mile],差一字可是差很多的
    1.5 Set Default Material:直接從工具列選擇
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    在"Search by Name"欄位內填入"pec" (means perfect conductor),下面視窗內即會自動搜尋到該名稱的材

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