smith-chart

Xnec2c is a high-performance multi-threaded electromagnetic simulation package to model antenna near- and far-field radiation patterns for Linux and UNIX operating systems.

Lightweight cross-platform RF circuit simulator — DC, S-parameters, harmonic balance, loadpull. Not a SPICE simulator.

Fast, interactive Julia/GTK+ plots (+Smith charts +Gtk widget +Cairo-only images)

NanoVNA RF learning board with SMA connectors for practical demos, experiments, and teaching.

Free browser-based Smith chart for impedance matching. Ladder networks, VSWR, Q, Touchstone import, amplifier design. No install.

Parametric analysis/visualization of model/measurement/simulation results

RF matching network synthesizer, optimizer, and S-parameter analyzer with live VNA control

This is a collection of open source, free to use and/or abandonware tools for Amateur radio.

CAD tool for designing RF and microwave circuits.

Smith Chart

GTK4 Drawing Area widget displaying a detailed Smith chart

Graphical Impedance Matching and Smith Chart - cloned from floppy drive source

Design and analytical synthesis of a 15 GHz Ku-band microwave low-noise amplifier based on the ATF-26884 GaAs pHEMT transistor and Rogers RO4350B substrate. Features Mathcad matching derivations, CST 3D electromagnetic simulations, and Altium Designer PCB layouts.

Design, analytical synthesis, and numerical simulation (Cadence AWR MWO) of a reactive L-section impedance matching network for the 2SK2974 UHF power MOSFET at 1.2 GHz, transforming complex sub-ohm port impedances to 50-ohm terminals.

A quick start project that shows how to create and configure the Syncfusion Vue Smith Chart component in a Vue application. This sample explains how to populate list data, add legends, and enable data labels and tooltips.

Complex impedance plane on a sphere with paired positive and negative resistance charts. Rust, egui, native and WebAssembly.

Designing Amplifier based on S-parameters

Local antenna and RF plotting app for HFSS, CST, ADS and VNA data, with S-parameters, radiation patterns, Smith charts and publication-ready exports.

Offline VS Code preview and comparison for Touchstone S2P files with Smith charts and dB plots.