Did you know that classic
papers by Phillip H. Smith, (referenced below), mark a major
milestone in the design of complex impedance matching networks?
What Smith did was to create a chart, aptly called
"Smith Chart," to map the impedance plane onto the reflection
coefficient plane. In plain language, he gave us visual
insight into what had been, up till then, just obscure
mathematical manipulation. With Smith's Chart you could actually see
a complex network take form as you added elements, one at a time, until
the final goal was achieved.
Back in those days his chart was used manually,
and although it took time, (and some getting used to), the visual
insight into complex impedance matching problems provided by the Smith
Chart quickly made knowledge of its use a required
skill for all microwave professionals. What was
true then is still true now.
The Smith Chart has been re-discovered by designers
of high speed computer chips and young RF/Microwave engineers!
We did something that would make old Phil smile! We computerized
his chart! In his honor, we call our program SmithMatch.
It gives you real
visual insight! We put everything on-screen for you, a nice clearly
labeled chart, a tabular display of frequency, impedance, and VSWR
data, and even the circuit file you're designing!
Then, we give you a library of lumped and distributed elements, and
useful time saving macro commands. The net result
is match network design simplified!
isn't SmithMatch in your tool box? At only $29.50,
its a steal! It will earn its keep by letting you see
what you are doing!
All prices are in USD,
and for a
2. P.H. Smith, "An Improved
Transmission Line Calculator," Electronics, Vol.
17, No. 1, January 1944, pp. 130-133,
1. P.H. Smith, "Transmission Line
Calculator," Electronics, Vol. 12, January 1939,
screen display shows a plot of a series RC network. It is a first order
approximation to the input impedance of a GaAs FET over the range of
8-18 GHz. The small circle at one end of the plot, (in the 3rd quadrant
of the screen), marks the low end frequency of 8
GHz. As a design aid, we've added a VSWR = 2 circle. The line at the
very bottom of the simulated display that reads "Ckt.\Load"
shows that we are looking at a load impedance file named "VENDELIN."
When you add elements, (using the Element
Library), and the match network begins to take form,
this line will grow towards the right, and you'll
see each element in the current network along with
addition to an Element Library, there is a File
Utility to help you enter and edit load impedance data, and,
when you run SmithMatch,
there are several on-screen commands to make life easier. You can
refresh the screen, add VSWR circles, save data, etc. We've done
everything possible to make this a good low cost
EASE OF USE:
menu driven and very simple to use. The User Manual is clearly written,
(you can READ IT on-line), and tutorial in nature. If you are rusty,
and need a quick refresher course in how to use a
Smith Chart, our examples will help you!
The program, and its support files,
can be downloaded, by you, direct from our server. The User Manual for
SmithMatch is available on-line.
You can view it or print it out
at your leisure. By having an on-line manual,
you're assured that you will get any typo error
corrections or tips instantly! Your manual will never
be "out of date." You may view the User Manual for SmithMatch
by clicking on the link below:
is priced at $29.50. To place an order, please visit our Order Info page.
All prices are in USD, and for a single-user
Our software is for use on Windows 95,
98, 98SE, Me, NT, 2000, and XP PC's, where the programs run in
a DOS window