tosmithchart.com Smith Chart · VSWR · RF Calculators

How to use this tool

This calculator helps RF engineers quickly convert between common mismatch metrics such as VSWR, Return Loss (dB), and reflection coefficient |Γ|.

Typical use cases

Notes

Results assume ideal conditions. Always confirm with calibrated measurements.

Quick Tools: VSWR / Return Loss Calculator • Z ↔ Γ Converter User Guide • About

What is Smith Chart?

The Smith Chart is a graphical tool widely used in RF and microwave engineering for impedance matching and transmission line analysis. It visualizes complex values on a unit circle so you can quickly read reflection coefficient (Γ), VSWR, and return loss.

tosmithchart.com is a lightweight online tool: paste data (Excel OK), plot trajectories, and compare multiple sets.

Additional RF Tools

Quick calculators for RF and microwave engineers.

▶ VSWR / Return Loss Calculator

Smith Chart

(comma/tab/space, blank line = new set, excel paste supported)

Tip: for reflection coefficient input, use Re(Γ), Im(Γ) values directly. If you are pasting impedance (R, X in Ω), keep Z₀ consistent.

Show Set
Set Name Input
# Re(Γ) Im(Γ) |Γ| VSWR Return Loss

Notes for Engineers

  • Return Loss (dB) = −20·log10(|Γ|). Higher is better.
  • When plotting trajectories, arrows show the last direction to help identify tuning flow.
  • If you use this for publication, double-check the reference plane and calibration state (VNA).

Recent Updates