Smith Chart™ Resources
This list of Smith Chart software is a mixture of professional packages for purchase, shareware,
and freeware, plus links to websites featuring Smith Chart topics.
- Smith Chart Video Tutorials -
Dr. Cynthia Furse, U. of Utah
Smith Chart Flash Presentation - by Brent Locher. An interactive Smith Chart tutorial with
5 different flash programs that contain a lot of embedded audio.
- Smith Chart
- Animated tutorial by Keith Schaub of Savvy Paper
- Smith Chart Artwork - A researched collection
by RF Cafe
Smith Chart Tutorial - Extremely well-done PowerPoint presentation
- Mysteries of the Smith
Chart - Stephen D. Stearns, K6OIK
Matching - Smith Chart from the National Taiwan University (in English)
Chart for Excel by RF Cafe - two unique spreadsheets that allow entering either
S-parameters or complex numbers - FREE
Smith Chart for Visio by RF Cafe - built on the MS Visio grid in vector
format so that resizing
retains all the detail. Use it for
reports and presentations.
handy Smith Chart display applet
- PDF file version from the
University of San
- History of Phil and Smith Chart
by Randy Rhea (Spread Spectrum)
- DaVinci, Smith
Chart and parameter conversion (S, Z, Y, G, H, ABCD)
- Smith charts with MathCAD from
The Circuit Sage
- Smith Chart items by Spread Spectrum
How to use a Smith Chart from Test and Measurement World magazine
- Smith Chart
for Palm OS by John Forste
- Smith 2.00
- advanced Smith Chart software
- linSmith - Smith Chart program for Linux
- PowerSmith - DOS compatible,
old, but works, VA3DIW, OK1RR
- QuickSmith, very nice FREE
Smith Chart program, Nathan Iyer
|Forbidden Regions of Impedance
|Because of the way in which the addition of series and parallel capacitances
and inductances move along lines of admittance and reactance, there are certain areas on the
Smith Chart, known as forbidden regions, within which the combinations of inductance and capacitance
cannot be used to translate the impedance to the center of the chart (perform an impedance
match). The reason can be made clear by an example.
|Series-added reactive components (inductors and capacitors)
move the impedance point along constant resistance lines as shown in red and purple to
the right. Shunt-added reactive components move the impedance point along the constant
conductance lines as shown in blue and green to the right. Recall that adding a shunt
capacitor increases overall capacitance, and adding a series capacitor decreases the overall
capacitance. The opposite is true for inductance.
||Suppose the impedance of a source lies in the Forbidden Region
in the Smith Chart in the upper right (above). Adding series inductor increases the overall
inductance and therefore moves the point along the red line (constant resistance), which
keeps the impedance within the Forbidden Region. The addition of a shunt capacitor increases
the overall capacitance and moves the point along the green line (constant conductance),
but can never move the point to the center where 50 Ω lies.
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