RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
Works for all active & passive microwave circuits, even with negative resistance!
South hemisphere for negative resistance, North hemisphere for positive resistance,
East inductive, West capacitive
Amplifier Stability Circles
Unconditionally stable: south hemisphere. Infinity becomes compact. Circles which
are never closed on the Smith chart get together in the South hemisphere.
3D Unilateral Transducer Gain & Group
delays & Quality Factors
3D Space surrounding the chart is used
to plot power gains too. Can be displayed over the constant gain circles which are
on the surface.
2D & 3D Mode, Z-Y Smith Charts
Match circuits on 5 constant resistance, reactance, conductance, susceptance
and constant reflection coefficient's magnitude circles. Choose from the 5 paths
(r,x,g,b,lat) and add normalized r,x,g,b, /stubs equivalents or lossless transmission
Any s1p and s2p
files can be imported (touchstone format). Parameters are plot on both 2D& 3D
Smith charts in Z/Y reconfigurable format.
Dynamic Frequency Sweep & Complex Ports
The tool proposes a dynamic frequency sweep to tune live the device
under study. The ports have complex characteristic impedances too. The tool can
deal with voltage reflection coefficient / power wave.
Dr. Andrei Muller, progenitor of the world's first
3D Smith Chart software
program, has teamed with a handful of able colleagues to release a commercial version
of this paradigm-changing design and analysis tool. 3D Smith Chart enables
you to visualize S-parameter data in ways not possible from the
perspective that is the traditional 2D Smith chart.
existed in a plane, and from an observer's perspective a 3-dimensional object entering
the plane from along the Z-axis seemed to appear out of nowhere; only its distance
and width changed as it passed through. Flatland dwellers rejected the existence
or even the possibility of a third dimension, dismissing offhand a rational requirement
for one, even punishing the citizen who dared to propose such a concept. After all,
two dimensions had served the world just fine. A similar restraint on perspective
is imposed upon the classic 2D Smith chart. 3D Smith Chart does for the
Smith chart what Einstein's concept of Relativity did for physics by adding the
fourth dimension of time.
Just as with most new concepts, the true value of the relatively new 3D Smith
Chart (debuted in 2013) has not been grasped yet by the engineering world. Heck,
getting your head around even the classic Smith chart is daunting enough for the
neophyte RF guy (or gal), so a bit of apprehension is understandable. As with the
classic Smith chart, however, once you finally comprehend and feel comfortable with
using it, the 3D Smith Chart opens new realms of understanding the parameters
your are working with.
My prediction is that either NI AWR or Keysight
Technologies will one day be integrating the 3D Smith Chart into its design
environment. Whichever does it first and trains the engineering community on its
use and indispensability as a design tool will see its fortunes rise quickly. Secretly,
product development managers are probably asking their staff why they didn't think
of the 3D Smith Chart before Dr. Muller did.
The features and possibilities for application are way too expansive to cover
here. Your best option is to review the detailed
User Guide, and direct any questions to Dr. Andrei Muller.
Pricing is very reasonable and discounts are available for students, universities,
and corporate multi-user licenses.