Grounding Strap Inductance Calculator

Flat Grounding Strap Inductance Estimator

Input Fields

Strap length

L

mm

Length of the grounding strap

Strap width

w

mm

Width of the grounding strap

Strap thickness

t

mm

Thickness of the grounding strap

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Strap Inductance

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Grounding Strap Inductance Formula

$$L_s = 0.2 \cdot L \left( \ln\left(\frac{w + t}{2 \cdot L}\right) + \frac{L}{0.223(w + t)} + 0.5 \right)$$

Where:

• $$L$$ = strap length (cm)
• $$w$$ = strap width (cm)
• $$t$$ = strap thickness (cm)
• $$L_s$$ = inductance (μH)

This equation estimates the inductance of a grounding strap with rectangular cross-section, used in electrical and RF systems. The design minimizes loop area and impedance.

Grounding Strap Inductance – Calculation Example

Given:

• $$L$$ = 100 cm
• $$w$$ = 5 cm
• $$t$$ = 0.05 cm

Calculation:

1. $$L_s = 0.2 \cdot 100 \left( \ln\left(\frac{5 + 0.05}{2 \cdot 100} \right) + \frac{100}{0.223(5 + 0.05)} + 0.5 \right)$$
2. $$= 20 \left( \ln\left( \frac{5.05}{200} \right) + \frac{100}{1.12615} + 0.5 \right)$$
3. $$= 20 \left( \ln(0.02525) + 88.83 + 0.5 \right)$$
4. $$= 20 \left( -3.679 + 89.33 \right) = 20 \cdot 85.651$$
5. $$L_s ≈ 1713.02~\mu H$$

Grounding straps are critical for ensuring low-inductance connections in high-frequency and high-current environments, such as in RF shielding, lightning protection, and sensitive electronic equipment. This calculator helps engineers quickly estimate strap inductance based on physical dimensions, assisting in designing effective grounding systems that minimize EMI and ensure safety and performance.