PCB Microstrip Crosstalk Calculator

Microstrip Crosstalk in Decibels Estimator

Input Fields

Spacing between traces

S

mm

Distance between adjacent microstrip lines

Substrate height

H

mm

Height of dielectric between trace and ground

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Your Results

Crosstalk (NEXT)

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Crosstalk Attenuation Formula (dB)

$$\text{Crosstalk (dB)} = -20 \cdot \log_{10} \left( \frac{h}{s} \right)$$

Where:

• $$h$$ = height of trace above ground plane (mm)
• $$s$$ = spacing between the adjacent traces (mm)

This formula provides a simplified estimate of coupling attenuation between two microstrip traces assuming uniform dielectric and ideal PCB geometry.

PCB Microstrip Crosstalk – Calculation Example

Given:

• $$h$$ = 0.3 mm
• $$s$$ = 1.5 mm

Calculation:

1. $$\frac{h}{s} = \frac{0.3}{1.5} = 0.2$$
2. $$\text{Crosstalk} = -20 \cdot \log_{10}(0.2) ≈ -20 \cdot (-0.699) ≈ 13.98~\text{dB}$$

Crosstalk in PCB design can compromise signal integrity, especially in high-speed buses like USB, HDMI, or DDR. This calculator gives a quick estimation of the coupling level between traces, helping engineers optimize trace spacing and placement. While simplified, this method provides immediate insight into layout decisions without full simulation tools.