⚠️For educational purposes only — not a professional tool. Learn more
Smith Chart Impedance Tool
Interactive impedance matching tool with drag-and-drop functionality, multi-frequency plotting, and S-parameter visualization.
Smith Chart
Impedance Input
Quick Help
- Click anywhere to add a point
- Drag points to see real-time changes
- VSWR < 2 indicates good matching
- Center = Z0 (perfect match)
- Right side = high resistance
- Upper half = inductive
- Lower half = capacitive
Smith Chart User Guide
Interactive Features
- Click Plotting: Click anywhere on chart to select impedance point
- Manual Entry: Enter specific impedance values for precise plotting
- Drag Interaction: Drag points to continuously update values
- Circle Overlays: Add constant R, X, and VSWR circles
- Matching Networks: Automatic L-network component calculation
- Multi-Frequency: Plot impedance vs. frequency sweeps
- S-Parameter Import: Load Touchstone files for analysis
- Data Export: Save results as Touchstone or CSV files
Advanced Capabilities
- Real-Time Calculations: Live impedance ↔ reflection conversion
- VSWR Indication: Visual and numerical VSWR display
- Quality Factor: Q calculation for matching networks
- Bandwidth Estimation: Fractional bandwidth analysis
- Component Synthesis: L and C values at specified frequency
- Transmission Line Mode: Impedance transformation visualization
- Stability Analysis: Two-port network stability assessment
- Noise Figure Circles: RF amplifier design optimization
Smith Chart Navigation Guide
Chart Regions:
- Center: Perfect 50Ohm match (Gamma = 0)
- Right Side: Inductive reactance (+jX)
- Left Side: Capacitive reactance (-jX)
- Outer Edge: Infinite impedance magnitude
- Real Axis: Pure resistive impedances
Movement Patterns:
- Clockwise: Moving toward generator
- Counter-clockwise: Moving toward load
- Full Rotation: lambda/2 electrical length
- Radial Movement: Adding series reactance
- Circular Arcs: Adding parallel susceptance