Interactive Smith Chart
Design impedance matching networks visually
Interactive Smith Chart
Load Impedance
Add Component
Matching Network
No components added. Add L or C components to build a matching network.
Results
Load Z:
25.0 +30.0j Ω
Final Z:
25.0 +30.0j Ω
Initial SWR:
2.87:1
Final SWR:
2.87:1
How to Use the Smith Chart
The Smith Chart is a graphical tool used to visualize impedance and design matching networks. This interactive version lets you add inductors and capacitors to transform impedance from a load to a target (typically 50Ω).
Getting Started
- Set Your Load Impedance: Enter the resistance (R) and reactance (X) of your antenna or load. The red dot shows this starting point on the chart.
- Add Matching Components: Use the dropdown to select series or shunt inductors/capacitors. Each component moves the impedance along specific paths on the chart.
- Aim for the Center: The goal is to transform the impedance to 50Ω (center of the chart). The green dot shows your final impedance.
Component Effects
- Series L: Moves clockwise along constant-R circles (adds positive reactance)
- Series C: Moves counter-clockwise along constant-R circles (adds negative reactance)
- Shunt L: Moves along constant-G circles (admittance chart)
- Shunt C: Moves along constant-G circles in opposite direction
Common Matching Networks
For most amateur radio applications, an L-match (one series and one shunt component) can provide a good match. The order depends on whether your load impedance is higher or lower than 50Ω.