New header graphic for mtt.org website incorporates the Smith chart
(although not being used yet at the time of this writing).
Somehow, even with
trolling daily for technical headlines, I managed to miss (until recently) that back in April of this year, IEEE's
Microwave Theory and Techniques Society (MTT-S) acquired the copyright to Phillip Smith's
legendary eponymous graphing format: the Smith Chart. Per a column by 2015 IEEE president Tim Lee in the Xplore publication:
IEEE's 2015 president.
"In 2015, the MTT-S had the opportunity to meet with Mrs. Anita Smith and her family and propose a way to preserve the legacy of her husband
and their father. The MTT-S offered to buy the
rights from the Smith family of the Smith trademark belonging to Analog Instruments, along with the copyright. In return, the MTT-S would
make the Smith chart available to students, practitioners, and indeed people all over the world involved in microwave technology. We would not
be buying the rights to re-author Smith's books or to print and distribute the charts, which is still the business of the Analog Instruments."
Interestingly, Mr. Lee mentions the widespread use of the Smith chart in magazines, books, company logos and artwork, personal products,
and software both with and without appropriate attribution and/or permission. Most people probably assume that just as they are free to reproduce
the ubiquitous x-y rectangular coordinate graph developed by Rene Descartes (i.e., Cartesian coordinates), that use of the Smith chart display
for plotting impedances and admittances is permitted as well. I try to remember to include attribution when using the Smith Chart. A Google
search turns up no instances of any copyright infringement lawsuits on behalf of the Smith family. Can you imagine the amount of money that
could be collected if such a lawsuit were successfully prosecuted?
According to the above quotation, MTT-S will not attempt to prevent the Smith Chart's continued use, which should come as a huge relief to
the microwave and RF community. We all owe a huge debt of gratitude to the family of Phillip Smith and equally important to the IEEE for its
gracious stewardship of our treasured Smith Chart.
Consider this my formal, "Thank-you!" to both parties.
Note: Dr. Andrei Muller has extend the 2-dimensional Smith chart into a 3rd
dimension. See his extensive work on the 3D Smith Chart website.
These original Kirt's Cogitations™
may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt
– noun: Concerted thought or reflection; meditation; contemplation.
Kirt [kert] – proper noun: RF Cafe webmaster.
Posted December 29, 2015