Smith Chart Tool, Fuji-Smith version 2.1 日本語版は==>ここ
This page is to draw Smith Chart to find series/parallel devices for impedance matching.
How to use:
1. Select ladder devices such as Capacitors, Inductors, Delay Lines, or Stubs.
2. Fill value for each device. Units are [F] for C, [H] for L, and [m] for Delay Line and Stub.
ISO prefix and scientific notations can be used for values, i.e. 1u or 1e-6 for 0.000001.
3. Fill R Value if you use lossy device. For lossy line, the value is per 1m. (e.g. ohm/m)
4. Fill characteristic impedance(Z) if the device is DL or stub. The unit is ohm.
5. Fill normalize impedance Z0 and frequency. Defaults are 50 and 1e9.
6. Fill "Freq (+" field in % for upper frequency to plot. Default is 5%.
7. Click "GO", or hit Enter-key if caret is in an input field.
You will find impedances ZL thru Z9 beneath the Go button and plots in the Smith chart.
Note that the Stub/DL length is equivalent-in-air, and no edge effect is considered.
Abbreviations: C=Capacitor, L=Inductor, DL=Deley Line,
Sc=Stub with closed termination, So=Stub with open termination,
C//R=C//R, C+R=C+Esr, L+R=L+R, L_DL/L_Sc/L_So=Lossy DL or Lossy Stub
NA=Not Applicable
Value example: 1.00e-6 or 1u for 1uH, 1e-12 or 1p for 1pF, 5e-2 or 5c for 5cm.
Z9 freq. sweep:
From (Hz)
To (Hz)
Step_count=
sweep GO
The very old article(==>This) gathers a lot of people since it was published. So, I thought I must make a tool to help. This page is for it.
This provides the means to choose one of many methods for impedance matching.
I will write examples on the next article for just one ZL, with some ten methods for matching, comparing the results.
This program is written in javascript. No other components are required than just this page (and one subdirectory for pictures) to make the total size small.
I confirmed that this works on Firefox 54, IE 11, EdgeHTML 15, Chrome 59, Android Firefox 55, Android Chrome 59, Raspbian Chromium 72.0, and Android Asus Browser 2.1. Old browsers such as IE8 will not work as they do not support HTML5.
History:
2017/08/06 1.0 First release
08/07 1.1 Error correction in Sc calculation
08/11 1.2 DL/Stub can use characteric impedance other than Z0.
08/15 1.3 ISO prefix (G, M, k, c, m, u, n, p) is applied. Note: case sensitive
08/18 1.4 Lossy components enabled. S21 is displayed as a consequence.
08/31 1.5 Missing trace in special case. (Overflow during drawing)
2018/02/05 1.6 Displays admittance of the cursor location.
08/24 1.7 Complies with recent browser's way of Javascript interpretation.
2019/06/04 1.8 Display VSWR of Z9, & display Z of the marked point.
2020/08/29 1.9 User can specify the bandwidth. (user requirement)
2022/02/24 2.0 Accepts ESR value in C, exclusive with G. (user requirement)
2022/04/11 2.1 Improved input error detection.
Ω,Ω/m
(Hz)
To 
(Hz)
Step_count=
sweep GO 
Hz= 
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