Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes USAF radar shop Notable Quotes App Notes Calculators Education Engineering Magazines Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Stencils for Visio RF & EE Shapes for Word Advertising RF Cafe Homepage Sudoku puzzles Thank you for visiting RF Cafe!
Innovative Power Products Resistors

IEEE MTT-S Buys Rights to Smith Chart
Kirt's Cogitations™ #268

New 2015 IEEE MTT-S Logo Using Smith Chart - RF Cafe

New header graphic for mtt.org website incorporates the Smith chart (although not being used yet at the time of this writing).

Image of the Smith chart from U.S. Department of Commerce documents for trademark 73/750111 - RF CafeSomehow, 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:


Tim Lee
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.

3D Smith Chart - RF CafeNote: Dr. Andrei Muller has extend the 2-dimensional Smith chart into a 3rd dimension. See his extensive work on the 3D Smith Chart website.

<Previous                     Next>

 

 

Posted December 29, 2015

A huge collection of my 'Factoids' can be accessed from my 'Kirt's Cogitations' table of contents.

Topical Smorgasbord, another manifestation of Factoids, are be found on these pages:

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 |

All pertain to topics that are related to the general engineering and science theme of RF Cafe.

RF Cascade Workbook 2018 by RF Cafe ConductRF D38999 RF Cables - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2018
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:  AirplanesAndRockets.com

spacer