Smith Chart

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Smith-Chart Software and Related Documents


Version Smith V4.1

This free online interactive Smith chart tool is a calculator which can help you design matching networks and obtain maximum power transfer between your source and load. This tool is javascript so it works on Windows, Mac, IOS, Android. Or any device with a web browser. The Smith Chart was originally created many years ago as an RF engineering aid by Phillip Smith of RCA. Actually, Smith may not have been the first inventor of this tool - a Japanese engineer named Kurakawa independently created a similar chart about a year before Smith. The Smith Chart The Smith Chart allows easy calculation of the transformation of a complex load impedance through an arbitrary length of transmission line. It also allows the calculation of the admittance Y = 1/Z of an impedance. The impedance is represented by a normalized impedance z. Once around the circle is a line length of l/2.

Smith V4.17'444kB zipComputer Smith-Chart Tool and S-Parameter Plot,
Newest assembly version is
Check assembly version in window “Help > About Smith”, see also 'Known Issues V4.1'

Smith Chart Download

1. Smith-Chart Diagram
  • Matching ladder networks with capacitors, inductors, resistors, serie and parallel RLC, transformers, serie lines and open or shorted stubs
  • Free settable normalisation impedance for the Smith chart
  • Circles and contours for stability, noise figure, gain, VSWR and Q
  • Edit element values after insertion
  • Tune element values using sliders (Tuning Cockpit)
  • Sweep versus frequency or datapoints
  • Serial transmission line with loss
  • Export datapoint and circle info to ASCII-file for post-processing in spreadsheets or math software
  • Import datapoints from S-parameter files (Touchstone, CITI, EZNEC)
  • Undo- und Redo-Function
  • Save and load designs (licensed version only)
  • Save netlist (licensed version only)
  • Print Smith-Chart, schematic, datapoints, circle info and S-Plot graphs
  • Copy to clipboard for documentation purposes
  • Settings for color and line widths for all graphs

2. S-Plot

  • Read S-Parameter - Files in Touchstone®-, CITI- and EZNEC-Format
  • Graphical display of s11, s12, s21 and s22
  • Graphical display and listing of MAG (maximum operating power gain), MSG (maximum stable gain), stability factor k and u and returnloss
  • Linear or logarithmic frequency axis
  • Cursor readout at gain and return loss graphs
  • Convert and export S-Parameter to normalized or unnormalized H-, Z-, Y- or A-Parameters in Touchstone® - Format files.
  • Export s11 or s22 to Smith-Chart
  • Print all graphics and listings

Without license the application will work in demo mode only. The demoversion may be freely distributed.
The demoversion is limited to 5 datapoints and 5 elements and following functions are disabled:
- Save project
- Save project As
- Save netlist

Smith Chart Calculator

Smith Chart

The Smith chart is just a plot of complex numbers. These could be admittance as well as impedance. To determine admittance from impedance (or the other way around) 1. Plot the impedance point on the Smith chart. Draw a circle centered on the Smith chart. The Smith chart contains almost all possible impedances, real or imaginary, within one circle. All imaginary impedances from - infinity to + infinity are represented, but only positive real impedances appear on the 'classic' Smith chart.

Commercial licenses of Smith with full capabilities are priced to US$ 120.
Licenses for universities, students and Ham’s with callsign are priced to US$ 80.
Send an e-mail to get ordering and payment information.

Related Documents

Smith Chart Solver

What's New in V4.0528kB pdfNew features in Version V4.011.2016
Known Issues V4.1222kB pdfIf you have troubles running V4.01.2018
CHM Help Error V4.1624kB zipSolution for Error Reading CHM Help File1.2018
Readme V4.1137kB pdfReadme Smith V4.1, (en)1.2018
Help V4.1 Printout4'353kB pdfHelp Smith V4.1, (en)1.2018
Examples V4.12'039kB pdfExamples for Smith V4.1, (en)1.2018
Examples V4.117kB zipExamples, xmlsc-Project Files for Smith V4.11.2018
Smith-Chart Introduction2'588kB zipIntroduction to the Smith-Chart, (Powerpoint, en)11.2016
Smith-Chart Introduction2'606kB zipIntroduction to the Smith-Chart, (Powerpoint, ge)11.2016
301kB pdfHow to open password protected Powerpoint11.2016
AN-95-11'311kB pdfS-Parameter Techniques, Agilent Application Note
AN-95-1_mov144kB zipMovies for AN-95
Smith-Chart1'912kB pdfPaper Smith-Chart, Color, Y-Z