About tosmithchart.com
tosmithchart.com is a lightweight, browser-based engineering tool designed for RF and microwave engineers.
Why This Site Exists
Smith Charts are fundamental in RF engineering, yet many available tools are either tied to commercial software or require installation and licensing. This site was created to provide a fast, free, and installation-free way to visualize reflection coefficient trajectories, VSWR, and return loss directly in the browser.
What the Tool Does
- Plots Smith Charts from pasted numerical data (Excel copy & paste supported).
- Supports multiple data sets for comparison.
- Displays reflection coefficient (Γ), magnitude |Γ|, VSWR, and return loss.
- Provides optional Smith grid, admittance grid, markers, arrows, and value labels.
- Works entirely in the browser using standard JavaScript libraries.
Intended Audience
This tool is intended for:
- RF / microwave engineers
- Students learning transmission line theory
- Engineers analyzing VNA measurement data
- Anyone needing quick Smith Chart visualization without heavy software
Limitations & Disclaimer
This site provides engineering calculations for convenience and visualization only. Results should always be verified against calibrated instruments, reference planes, and trusted simulation or measurement tools before use in design, production, or publication.
Future Improvements
- Dedicated reflection coefficient (Γ) direct-input mode
- Frequency sweep visualization
- Export options for CSV / SVG
- More educational examples and explanations
Feedback and suggestions are always welcome.