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Smith Chart Plot

4.2 | 42 ratings Rate this file 75 Downloads (last 30 days) File Size: 15.7 KB File ID: #1923 Version: 1.0
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Smith Chart Plot


Victor Aprea (view profile)


02 Jul 2002 (Updated )

Plots a smith chart, and optionally draws reflection coefficient and line of intersection with R=1.

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File Information


(1) plotsmithchart.m


(1) plotsmithchart(Zl,Zo)
Where Zl is the Load Impedence (possibly complex) and Zo is the Characteristic Line Impedence. Plots a smith chart, along with the reflection coefficient circle and the line of intersection with resistive component equal to 1.

(2) plotsmithchart
Without any parameters draws a blank smith chart. Wavelengths toward the generator are labeled around the perimeter.

Example calls:

(1) plotsmithchart(25,50)
Draws a smithchart,calculates and plots the reflection coefficient for a characteristic impedence of 50 ohms and a load impedence of 25 ohms.

(2) plotsmithchart(50+50j,75)
Same as (1) with a load impedence of 50+50j ohms.

(3) plotsmithchart
Plots a blank Smith Chart.


This file inspired Smith Chart Utility.

MATLAB release MATLAB 5.2 (R10)
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Comments and Ratings (45)
28 Oct 2015 Nasim Abdollahi  
05 Apr 2015 Saurabh Kataria

Thanks for the file. It would be more helpful if it can support more functions.

05 Aug 2014 Wenjie

Wenjie (view profile)


If it just plot the standard Smith chart without any input or output required will be even better.

17 Jul 2012 Nevin

Nevin (view profile)


14 Oct 2011 AARON

AARON (view profile)

Thanks very much!!
Can I read the exact value from this plot,for instance, Gama, SWR or angle

07 Oct 2011 Sergio

Sergio (view profile)

VEry nice.
The colors make the reading a bit harder. But the rest is cool.

13 Apr 2010 Zane Montgomery

If I may give a suggestion, appending


to all of your non-data plot commands will make them unselectable

05 Aug 2008 Les French  
27 Apr 2008 Fournier Matthieu  
07 Apr 2008 kalai vannan  
24 Feb 2008 Prakash N  
04 Feb 2008 robert chow  
31 Dec 2007 Nick C


Comment only
05 Nov 2007 hassan rekabi  
30 Sep 2007 toto fuentes

thank you very much

27 May 2007 Someone who was really in need of this code


04 May 2007 yanu tika

it's helpfull

26 Apr 2007 tran thanh truc

Should do more things than just plotting it, for example,u can compute the conditional stable for each [S] maxtrix of 4-port network.

11 Feb 2007 shahram karimi

it's very useful if you work on transmission line

24 Jan 2007 Georgios Giannakopoulos

I would like to know how how to plot the frequency responce in the smith chart as appears on the most softwares. Thank you very much.

11 Jan 2007 lalji katariya

give more examples of smithchart simulation in MATLAB

27 Dec 2006 s s  
29 Aug 2006 zhi yang

Example calls
are not in file-m ?
I need it,
please help me

Comment only
18 Jul 2006 jing wen  
23 Mar 2006 ADOEN SION


20 Oct 2005 chan see


15 Oct 2005 Lu Yong

It's really very good.

15 Oct 2005 Maraach Bassem  
17 Mar 2005 qaisar qadeer

still needs improvement though but its good help for every1 and big time effort too especially in MATLAb ....keep up the good work ....

01 Mar 2005 etsg wetg  
29 Nov 2004 Giulio Vitale  
26 Sep 2004 yogeshwar Ranga  
07 Jul 2004 nobitakung nobiakung  
25 May 2004 takis soteropoulos  
16 Apr 2004 Risha Devi

got some informations about plotting smith chart

31 Oct 2003 Antonio Arce

Great program to verify hand-drawn SWR circles and determining the reflection coefficient.

17 Oct 2003 Manoj P

program for basics and understanding, thanks

19 Aug 2003 Sakari Tainlahti

Good performance Thank!

15 Jul 2003 Franklin Yusti


Comment only
01 Jul 2003 Tom Smithie

This program is good for only ONE value.
If you want to see how a system looks like in a range of frequency (e.g., an inductor from 1MHZ to 500MHZ), this is not your choice.

23 Jun 2003 mohamad Reza Azadi  
18 Jun 2003 Bill Chang  
17 Apr 2003 parviz mouzafari  
16 Mar 2003 Lina Chang

Asside from being capable of plotting impedances and calculating reflection coefficients, it also spews out a very nice Smith chart.

03 Jul 2002 Desmond Lee

Nice program. No more messy Smith Chart needed anymore.

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