PCB Library — Tools and Footprints for PCB Designers

Microstrip Mitred Bend Generator – PCB Design Tool

This tool calculates and visualizes a microstrip mitred bend for use in high-frequency PCB designs. It is based on empirical formulas used to optimize 90-degree bends in microstrip traces, minimizing signal reflections and impedance discontinuities.

You can input the width of the microstrip line (W) and the height of the substrate (h) in micrometers (µm). The tool will calculate the optimized cut (X and A) for a mitred corner and draw the geometry to scale.

How to Use:

1. Enter the width of the microstrip line (W) in µm.

2. Enter the height of the dielectric substrate (h) in µm.

3. Click “Solve” to generate the drawing and calculate:

   • The mitre cut length X

   • The diagonal length D

   • The offset A and percentage Xd

4. Click “Download DXF” to export the geometry in millimeters (mm).

Importing into Your PCB Software:

The exported .DXF file contains only the mitred polygon in real-world units (mm). You can easily import it into your PCB layout tools as part of the top copper layer or a mechanical layer.

Supported tools include:

• Altium Designer – Use File > Import > DXF/DWG and assign it to a layer (e.g., Top Layer or Mechanical 1).

• Cadence Allegro/OrCAD – Use Import DXF via PCB Editor and map the geometry to a subclass.

• Mentor Graphics PADS – Use DXF Import Wizard.

• KiCad, EAGLE, EasyEDA, and others – most tools support DXF importing into copper or mechanical layers.

Applications:

• High-speed digital traces

• RF/microwave signal routing

• Controlled impedance traces

• Differential pair tuning

Note: Always verify units (mm) and alignment after importing. You can use this tool to improve the performance of your bends in critical RF and high-speed designs.

See also PCB Hole Pattern Calculator