PCB 阻抗預估計算器：Microstrip、Stripline 與差分對

阻抗預估計算器怎麼用

阻抗預估適合在設計初期抓線寬、介質厚度與 Dk 的方向。正式 controlled impedance 應交由 field solver、工廠疊構與 impedance coupon 驗證。

This PCB impedance calculator gives an early routing estimate for line width, dielectric height and Dk. Production controlled impedance should be validated with a field solver and test coupon.

Simplified microstrip / stripline estimate

公式: Z0 is estimated from dielectric constant, dielectric height, trace width and copper thickness

• Dk: dielectric constant of the material system.
• H: dielectric height between trace and reference plane.
• W: trace width.
• T: copper thickness correction.

公式依據

• Formula basis: simplified transmission-line approximations for early microstrip and stripline planning.
• Reference: IPC lists IPC-2141 for controlled impedance circuit boards and high-speed logic design guidance. https://www.ipc.org/ipc-design-standards
• Engineering note: final controlled impedance should be validated by a field solver, factory stack-up and impedance coupon measurement.

範例

With Dk 3.4, 0.05 mm dielectric height, 0.1 mm width and 0.5 oz copper, the tool gives an early single-ended impedance estimate.

相關製程站

• 疊構設計 - Total thickness, dielectric spacing, symmetry, controlled impedance
• 線路設計 - Trace width, spacing, bend-zone routing, differential pair spacing
• 電測 - Open / short, resistance, voltage drop, impedance coupon

相關計算器

• 線寬電流計算器 - 依銅厚、溫升與內外層估算線寬及載流能力。
• 電壓間距估算器 - 用自訂設計規則估算 conductor spacing，適合作為 clearance / creepage 初步檢查。
• 線路電阻壓降計算器 - 依線長、線寬、銅厚、電流與溫度估算電阻、壓降與功耗。

FAQ