3DEXPERIENCE 3DDashboard Costing Organisation displaying vehicle profiling data for ECAR Standard, including configuration (Body: ECAR, Engine: 310kW, Wheels: 20inch), performance risk analysis with red triangle indicators, material cost comparisons from December 2021 to December 2023, material decomposition pie chart, cost forecast graph, and a 3D model of the vehicle highlighting key components.

CST毫米波雷達模擬解決方案介紹(五)

上一期我們提到饋電網路有相位差,從上圖可以看出,S41與S51的相位差超過100度,S51與S61的相位差也超過了10度,過大的相位差不僅會影響陣列天線的波束指向,還會導致天線出現副瓣抬升、增益下降等現象。

本期我們介紹如何使用CST針對饋電網路的相位差進行快速補齊、最佳化,具體方法如下:

1.先利用CST的後處理計算各埠的相位差,我們選擇S51的相位作為基準,其他S參數的相位和S51相減,得到下面的相位差。

Graph titled '1D [Real Part]' showing the real part of two datasets, 'Mix 1D' and 'Mix 1D_1,' plotted against frequency in GHz. The x-axis ranges from 76 GHz to 77.8 GHz, and the y-axis ranges from 10 to 110. The orange line represents 'Mix 1D,' and the black line represents 'Mix 1D_1.' At 77 GHz, 'Mix 1D' has a value of 17.050761 and 'Mix 1D_1' has a value of 106.73668.

2.在Task裡面建立一個最佳化流程,選擇需要調整的微帶線長度變數作為被最佳化的變量,設定好參數變化範圍。

Screenshot of optimization software interface 'Optimizer: Opt2,' displaying algorithm settings for 'Trust Region Framework.' The interface includes a table of parameters such as array_spacing, c0, and DS_L1 with their respective minimum, maximum, initial, current, and best values. Options to reset values, use current as the initial value, and utilize data from previous calculations are available. Bottom panel features buttons labeled Start, OK, and Apply.

3 、選擇相位差作為最佳化目標,Target設定小於5度。

Screenshot of optimization software interface named 'Optimizer: Opt2,' showcasing the Goals tab with three optimization goals listed. Each goal includes details such as ID, type, operator, target, range, and weight. The interface provides options to add, edit, or remove goals and configure optimization settings, with buttons for Start, OK, Apply, and Remove.

4.點擊start之後,CST迅速得到了最佳化後的結果,我們可以看到相位差已經小於5度。

Graph titled 'S-Parameters [Phase in Degrees]' showing phase responses of S2,1 (green), S3,1 (blue), and S4,1 (orange) versus frequency in GHz. The x-axis ranges from 76 GHz to 77.6 GHz, and the y-axis represents phase values in degrees. At 77 GHz, the phase values are: S2,1 at 45.091435°, S3,1 at 50.720079°, and S4,1 at 46.238536°.

5.接下來我們把電路圖自動產生3D模型,為後續的饋電網路和天線陣子協同模擬做好準備。

Graph titled 'S-Parameters [Phase in Degrees]' showing phase responses of S2,1 (green), S3,1 (blue), and S4,1 (orange) versus frequency in GHz. The x-axis ranges from 76 GHz to 77.6 GHz, and the y-axis represents phase values in degrees. Specific values at 77 GHz are highlighted: S2,1 at 45.091435°, S3,1 at 50.720079°, and S4,1 at 46.238536°.

原文轉載來自: 周明 – CST毫米波雷達模擬解決方案介紹(五)

系列文章:

CST 毫米波雷達模擬(一)
CST毫米波雷達模擬(二)
CST毫米波雷達模擬解決方案介紹(三)
CST毫米波雷達模擬解決方案介紹(四)

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CST系統級RS模擬(二)—— RS模擬場地較準(掃頻模式)

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