Microstrip Inductance Calculator | RF Design

This tool calculates the inductance of a microstrip transmission line based on its physical dimensions and substrate properties. Microstrip inductance is a key parameter in RF and microwave circuit design, affecting signal integrity and overall performance.

What is Microstrip Inductance?

Microstrip inductance refers to the inductive property of a microstrip line, which is a type of transmission line used in printed circuit boards (PCBs) for high frequency signals. The inductance is influenced by the trace width, substrate height, and the relative permittivity of the substrate material.

Microstrip Inductance Calculator

EXAMPLE:

• INPUTS:

  • length of the microstrip (l) = 2 inches
  • width of the microstrip (w) = 0.1 inches
  • height of the substrate (h) = 0.05 inches

• OUTPUT:

  • Inductance (L) ≈ 0.0386 µH

Microstrip Inductance Formula

The following equation or formula is used for the Microstrip Inductance calculator:

L = 0.00508 × l × [ln((2l)/(w + h)) + 0.5 + 0.2235 × ((w + h)/l)] Where:

• L = Inductance (µH)
• l = Length of the microstrip (inches)
• w = Width of the microstrip (inches)
• h = Height of the substrate (inches)

Key benefits

• Accurate Design: Helps in precise calculation of microstrip inductance for reliable RF circuit performance.
• Optimized Performance: Enables designers to optimize microstrip dimensions for desired inductive properties.
• Versatile Applications: Useful for RF and microwave PCB design, antenna feed lines, and high-frequency signal routing.

Summary

Microstrip inductance is a critical parameter in RF and microwave circuit design, influencing signal behavior and overall system performance. This calculator provides an easy way to determine the inductance of microstrip lines, aiding designers in creating efficient and effective PCB layouts.

References

• G. W. A. Dummer, Materials for Conductive and Resistive Functions, Hayden Book Co., 1984.
• D. M. Pozar, Microwave Engineering, 4th Edition, Wiley, 2011.