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 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
- Impedance Matching - Smith
Chart from the National Taiwan University (in English)
Chart for Excel by RF Cafe - two unique spreadsheets that allow entering either
or complex numbers - FREE
Smith Chart for Visio by RF Cafe - built on the MS Visio grid in vector format so that
retains all the detail. Use it for reports and presentations.
handy Smith Chart display applet
- PDF file version from the
University of San Diego
- 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,
|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.