Microwave Hall of Fame
Part II

Updated December 4, 2009

The field of microwave engineering contributed a lot to the efforts of both sides (all sides?) during World War II. Building on the work done earlier in the century, engineers developed microwaves theories and techniques for military and commercial applications that are still in use today. And they didn't have computers!

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Shintaro Uda (July 1, 1896 to August 18, 1976) invents and patents a high-gain antenna in 1926, while attending Tohoku Imperial University, in Sendai, Japan. His faculty adviser is Hidetsugu Yagi (January 28, 1886 to January 19, 1976). The Yagi-Uda concept uses reflector and director elements to drive a "live" dipole. Yagi published an English translation describing the work in 1928, from that time on his name was associated with the invention of his pupil. The Japanese war machine largely ignored this outstanding antenna, which the Allies put to good use. Nominated to the Microwave Hall of Fame by Justin!

Albert Wallace Hull was born Connecticut in 1880. He earned a Ph.D. in physics at Yale, then worked at General Electric's research lab in Schenectady NY. He was a noted vacuum tube inventor. One of his tubes used magnetic control; it was called the magnetron. Hull's magnetron only operated at kHz frequencies, but it cranked out 15,000 watts of power and could be used as both an amplifier or an oscillator. By WW II, the magnetron became an important component of many radar systems. Today, all commercial microwave ovens use mass-produced magnetrons. Nominated by Ed Reilly, VP, Schenectady County Historical Society, and webmaster for the Edison Exploratorium in Schenectady, NY, which has its own electrical engineering Hall of Fame, thanks, Ed!"

Heinrich Georg Barkhausen (1881-1956) was a German Physicist with many interests. Dr. Barkhausen was also the world's first chair professor in the communications branch of electrical engineering, at the Technische Hochschule (technical academy) in Dresden (1911). Among his accomplishments, he was first to provide physical evidence of magnetic domains in materials, in an experiment that came to be known as the Barkhausen effect. Later work led to the Barkhausen Noise Analysis technique for inspecting stresses in materials. His contributions to microwave technology include theory of electron tubes, and development of a high-frequency oscillator (a near-microwave tube) with co-inventer Karl Kunz, which led to understanding of velocity modulation. He established the Barkhausen Stability Criterion which is used to predict when oscillations begin in feedback circuits. After the war he returned from West Germany to Dresden (East Germany) to aid in reconstruction of his Institute of High-Frequency Electron-Tube Technology, which had been fire-bombed. A move that must have taken no small amount of courage! Nominated to this Hall of Fame by Alex!

Charles Édouard Guillaume (1861-1938, pronounced "gee-ohm" with a hard g, as in "get") was a Swiss physicist who received the Nobel Prize in Physics in 1920 in for his work on the anomalies in nickel steel alloys. One of Guillame's discoveries (dating to 1896) is the low-expansion alloy Invar, which was named by shortening the word "invariant". Invar can be created to have a near-zero thermal expansion coefficient. Work on nickel-steel alloys proceeded rapidly after the invention of the transistor, in order to provide a package material that has low thermal expansion (to match semiconductor substrate materials) as well as the ability to provide an extraordinary glass hermetic seal for feedthrough pins (although this serendipitous discovery was not an outcome of Guillaume's research). Invar is used in space missions where wide temperature variations must not affect dimensions of key components, such as mounting hardware for telescope mirrors.

In 1932, Sir Robert A. Watson-Watt came up the idea of “RDF”, Radio Direction Finding. He wrote a paper (with A.F. Wilkins) describing this new technique of Radio Detection and Ranging giving it the code name of "radar” in 1935. It was proved that the theory would work, but with a range of only eight miles using the state-of-the-art devices of the day. By the autumn of 1938 radar systems were in place along the south coast of Britain. Watson-Watt became scientific advisor to the British Air Ministry in 1940 and in 1941 went to the United States to set up radar systems there. He lived from 1892 to 1973. In 1959 Watson-Watt published his autobiography, entitled "The Pulse of Radar". This 434 page tome is a treasure trove of information on the development of all types of radars and countermeasures during WWII. The 1954 story about the 62-year-old Father of Radar getting a $12.50 speeding ticket from a Canadian cop who doesn't know who he's giving the ticket to, much less how his "electronic speed-meter" works is solid gold! Watson-Watt wrote a poem about his speeding ticket experience, Microwaves101 keeps it here! Last time we checked there were five used copies of The Pulse on Amazon.

Also at Bell Telephone Labs in the 1930s, Dr. George C. Southworth discovered that radio waves could be transmitted efficiently through a hollow, water-filled copper pipe. He must have been a frustrated plumber. He and his team at Bell found that electromagnetic energy traveling through an enclosed structure moved in distinct patterns that we all know and love called "modes", and that the optimum diameter for a waveguide pipe was slightly greater than one-half wave length. They also experimented successfully with square, rectangular and oval waveguides.

At the same time, W. L. Barrow had been studying antennas and reflectors of various shapes, which led him to experiment with hollow tubes. His successful propagation of waves through a tube 18 inches in diameter was published in May 1936. Today, the most common shape for waveguides is rectangular, with dimensions about one half wavelength by one quarter wavelength at the center frequency.

Johannes Jauman (sometimes spelled Jaumann) was born in 1903 in Bruenn (now Brno in the Czech Republic). A citizen of Germany From 1933 to 1945, he was professor theoretical electro-technology in Bruenn. During World War II Jaumann was involved in work on "black submarines" - to reduce the radar cross section of submarine snorkels and periscopes. At the same time countries were pouring money into radar research, his efforts helped Germany develop radar absorbing materials. The project's code word was "Schornsteinfeger", which translates as "chimney sweep", a reference to the use of carbon black in the material. The first applications for Jauman's RAM was in the periscopes of U-boats, as well as flag poles of surface ships. However, the larger efforts in the U.S.A. and England to develop microwave, radar and other technologies were more crucial in winning the war. (Danke, Peter B!)

Still need a picture!

Russian "Rootless Cosmopolitan" Abram Fedorovich Ioffe was born in 1880. After studying in Germany at the Roentgen laboratory, in 1918 Ioffe founded the State Institute for Roentgenology and Radiology in St. Petersburg, one of the first research centers of Russia. In three years, the Physico-Technical Department of this Institute separated to become the Physico-Technical Institute, which today is simply called the Ioffe Institute. Why is Ioffe in the Microwave Hall of Fame? The Ioffe Institute made a specialty out of studying the properties of semiconductors, way back in the 1930s, long before the transistor was invented. If you've ever searched the world wide web for, say, the DeBye temperature of gallium nitride, then you've probably stumbled onto the biggest treasure trove of semiconductor info on the planet. Thanks to Dr. Ioffe! Ioffe ran his research institute until 1950, and died in 1960.

A student of Ioffe's , Russian radio and television engineer Lev Sergeyevich Termen (Léon Theremin, 1896-1993) created the electronic musical instrument that bears his name in 1920. The Theremin is the only instrument that you don't touch when you play it! Check out this video of Theremin demonstrating his art, he was obviously a pretty good cello player as well. Theremin was not a one trick pony, he was quite an RF engineer. He invented interlacing for video signals, and developed an ingenious electronic bug powered by 330 MHz RF illumination (like RFID) that went undetected for seven years in the American ambassador's house in Moscow.

In 1933, two Bavarian physicists, Dr. Lothar Rohde (1906 - 1985) and Dr. Hermann Schwarz (? - 1995) formed a company based on a frequency meter they developed together, six years before Hewlett and Packard launched their test equipment company in a garage in Silicon Valley. Based in Munich, the “Physikalisch-Technisches Entwicklungslabor" company soon prospered; during World War II, PTE earned the distinction of becoming a target of Allied bombing. Temporarily shut down after the war, the company soon did brisk business with the Occupation as an equipment depot, maintaining and repairing radio equipment for the Uncle Sam. By the 1950s, the newly renamed Rohde and Schwarz GmbH & Co. KG. was back at the forefront of research and development, and were the pioneers of commercial FM radio in Europe, among other achievements. Today Rohde and Schwarz brings in over one billion Euros of business and employs over 7000 people world wide, and surely is a feared competitor if you are an Agilent employee. Thanks to Brian, of the Philippines!

Rohde and Schwarz

In 1937, funded by $100 by Stanford University, Sigurd (top of photo) and Russell Varian demonstrated the first klystron tube, later used in American radar systems during WWII to locate and lay waste to the Luftwaffe. In 1949 they founded Varian Associates, one of the very first technology-based companies in what would soon become silicon valley. The photo was taken by famed fotog Ansel Adams, but it looks more like a promo for a 1950's sci-fi thriller. Lifelong environmentalists, variations of their klystron tube provide millimeter-wave power today. The Varians had considerable help in their enterprise from the start from Edward Leonard Ginzton, who was born in 1915 in the Ukraine and emigrated to the United States in 1929 after a war-torn childhood. Ginzton was an early researcher on the klystron tube, was also known for his work on megawatt sources for linear particle accelerators, gaining 50 patents. He hit his stride managing Varian Associates, helping define a management style that attracted top talent, that at the time was unique but is now the norm for high tech startups. Ginzton died in 1998. Thanks to Daniel for making sure ELG is not forgotten here!

Harold Alden Wheeler (1903-1996) is remembered today in microwave circles for the equations he developed for the characteristic impedance of microstrip (curiously, he disliked both terms, characteristic impedance and microstrip, and refused to use them). Wheeler had a remarkable career. While still at college in the early 1920s he worked part-time for the then National Bureau of Standards and developed equations for estimation of the inductance of solenoidal coils; these are still known today as Wheeler's equations. He is also know for the Incremental Inductance Rule which calculates loss due to skin depth on arbitrary transmission line geometries. Wheeler was involved in the development of the Neutrodyne receiver and the first receiver with diode automatic volume control and linear detector. He then worked on FM and television development until WW2 when he designed IFF and radar systems. After the war he founded Wheeler Laboratories, Inc. The company developed systems and antennas for missile tracking and guidance. In his later years Wheeler served his country as an expert consultant; he was one of some 40 members of the Defense Science Board, advising the Government on scientific matters relating to defense.

Harold Alden Wheeler Wheeler obtained 180 US patents and many foreign ones in his 40-year career and received numerous awards and commendations. He appears in the Microwave Hall of Fame due to the efforts of Kerry from Down Under! As of June 2007, he still doesn't have a page in Wikipedia, what's up with that?

By the end of the thirties, secret work was afoot in both the USA and the United Kingdom. At Bell Telephone's Radio Research Lab in New Jersey, Philip Smith, born in Lexington Massachusetts, developed a circular chart form in 1939 that shows the entire universe of complex impedances in one convenient circle. The Smith chart is still in wide use today, and will be around long after we're all gone. Les Besser recalls that Philip Smith submitted an article on his development to the IRE, which was rejected. The picture of handsome Phil is courtesy of his wife Anita, and just might be the only picture of him you could find on the entire worldwide web! By the way, Anita's company, Analog Instruments of New Providence, NJ, still supplies the ubiquitous chart in paper form to the microwave industry.

William Doherty worked for Western Electric's Bell Laboratories in the development of high-power transmitters for transoceanic broadcasting when he invented the "Doherty Amplifier". His development of a method for greatly improving the efficiency of RF power amplifiers makes his name familiar in the RF industry today. Doherty was awarded the Morris Liebmann award by the Institute of Radio Engineers in May 1937 for his idea. He was still twenty nine years young! His invention was quickly brought to market by a devoted team of Western Electric engineers. By 1940 Western Electric had incorporated the Doherty concept in 35 commercial radio stations worldwide, at powers up to 50 kilowatts. This concept has been exploited many times by microwave designers in the last twenty years, including MMIC representations; the 2004 IEEE Microwave Symposium lists about 10 papers with "Doherty" in the title! We are still waiting for Bill's daughter to dig up a better picture of her famous Dad to replace the one on the right...

1939 photo of kystron pioneers. Standing, left to right are Sigurd Varian, David Webster and William Hansen. In front are Russell Varian and John Woodyard

John Robert Woodyard was born in West Virginia 1904. He began as many did in the early decades of the 20th century; he tinkered with radio, cars and electricity. He worked as a radio operator on cannery ships in the Alaska fishing industry. Later, he decided to formalise his education and studied at University of Washington. He went on to Stanford University for his Ph. D; his thesis was on the Doherty grid-modulated amplifier with Frederick Terman. The Terman-Woodyard amplifier (a relative of the Doherty amplifier) was the result. Although several others carried the idea forward, it was John Woodyard who had the initial idea for "slabline" used in the HP 809 slotted line. Up to and during WWII he worked with the Varian brothers as a key player in development of the klystron. After WWII his work was more in physics than in microwaves. He was a major contributor to the Berkeley Laboratory/Stanford Linear Accelerator. Woodyard died in 1981. Contributed by Kerry!

William Webster (Bill) Hansen (1909 - 1949) Bill Hansen invented the electromagnetic resonant cavity which is the basis of several microwave devices (including the klystron). He entered Stanford University at the age of 16; Russell Varian was also at Stanford and the two became lifelong friends. Hansen joined the faculty at Stanford in 1934. In the late 1930s he worked with the Varian brothers, John Woodyard and others to develop the klystron. Of the origins of the klystron, Russell Varian said "among other ideas, Dr. Hansen proposed the use of a concentric line resonator for generating high voltages. Hansen and I discussed this possibility at considerable length and considered what form of concentric line would have the maximum efficiency." In 1941 Hansen and his research group moved to the plant of the Sperry Gyroscope Company in Garden City, N.Y., contributing to developments on Doppler radar, aircraft blind-landing systems, electron acceleration and nuclear magnetic resonance. During World War II he worked in New York on defense applications of physics and electronics, including radar. Hansen was also a scientific consultant on the Manhattan Project during the World War II. Bill Hansen died at age 39 from lung disease caused by beryllium from the devices with which he worked. Also contributed by Kerry!

Frederick Emmons Terman (1900 - 1982) Fred Terman had an early interest in the then-novel field of wireless; he built his own receivers and transmitters in his teenage years and later became a well-known radio amateur. He studied for his undergraduate degree in chemistry and master's degree in electrical engineering at Stanford University before finishing his Ph.D. at MIT in 1924. It was at MIT that he learned a "business" approach to education and engineering.

After MIT Terman joined the Stanford faculty and taught electrical engineering. He convinced the authorities that there was a future in radio and electronics and so began the many years of education and research that made Stanford a world leader in that field.

In 1932 Terman published the seminal textbook, Radio Engineering; it became a standard reference. In 1943 he published the Radio Engineer's Handbook which, like its predecessor, also became a standard. From 1942 to 1945, he directed 800 staff at the Harvard University Radio Research Laboratory in research and development of radar countermeasures. He returned to Stanford as Dean of Engineering after WWII and never left again; he was Provost & Vice-President on his retirement in 1965. Terman was a great leader and many of his students went on to play key roles in the development of Silicon Valley. Two such were Bill Hewlett and Dave Packard; Terman was instrumental in helping them set up the famous Palo Alto garage. Another contribution by Kerry!

At the Battle of Britain in 1940 the British were able to detect enemy aircraft at any time of day and in any weather conditions, proving the value of microwaves to the world. The Massachusetts Institute of Technology (MIT) opened the Radiation Laboratory to research applications for radar early in the 1940s. But back in England, the British needed help.

Two British scientists, HAH Boot and JT Randall at the University of Birmingham had devised a valve (the Limey word for "tube") which could generate 1000 times the power of any other existing microwave generator at the time. They named it the "cavity magnetron" (see Albert Hull). The problem was that it took them a month to create a dozen of the complex units. Watson-Watt suggested they talk to MIT, and MIT in turn suggested that the British meet with a small company called Raytheon, which had been founded by an ex-MIT professor, Vannevar Bush.

According to the book The Creative Ordeal, by Otto J. Scott, "Vannevar" rhymes with "Beaver". Not so! We recently talked to Norman Krim, curator of Raytheon's historic archive, and he knew Mr. Bush personally, having been hired by Raytheon in 1935. Otto Scott was a contract writer, an outsider to Raytheon. The correct pronunciation is "VAN-uh-var". Happy 94rd birthday, Norm!

In 1942, Harald T. Friis, working in Bell Labs in Holmdel NJ, developed the theory of "noise figure" that allows engineers to calculate the signal-to-noise ratio at the output of a complex receiver chain, and thus has a powerful equation named after him. Harald was born in Naestved Denmark, in 1893. He graduated 1916 in Electrical Engineering from the Polytechnic Institute (founded 1829 by H.C. Oersted, the discoverer of electromagnetics). In 1919 he received a fellowship which enabled him to come to the United States where he studied radio engineering at Columbia University. In 1920, Friis joined a research group headed by at the Western Electric Company and apparently got stuck in the U.S.A. He eventually became a U.S. citizen, which later did not prevent him from being awarded the Valdemar Poulsen Medal of the Danish Academy of Sciences. He held 31 U.S. patents submitted over five decades of research. In 1971 he published a book on his life titled "Seventy Five Years in an Exciting World". This gem not only contains some great history, but also strange glimpses of Harald's life, such as drinking near-beer instead of milk as a child, apprenticing as a blacksmith, being bitten by bedbugs in a New York hotel, and naming his favorite pipe tobacco.

Click on photo for high-res jpg! Photo courtesy of Raytheon historical archive. Percy was a Marlboro Man!

One of Raytheon's engineers, Percy Spencer, took home one of the super-secret magnetrons, and figured out a new manufacturing process that cut manufacturing time to a mere fraction of what it was AND improved the power efficiency. Within a month, Raytheon was making thousands of magnetrons a day for the war effort. Throughout the war years, new efficient sources were rapidly developed for transmitting microwave radar pulses which by the end of the war had reached peak power levels as great as several million watts. One more story about Percy Spencer. Just after the war, Percy Spencer was still working with magnetrons when he noticed that a chocolate bar in his pocket melted when he walked in front of the magnetron. After a bunch of experiments, he found that popcorn popped! Eggs exploded! You guessed it, Percy Spencer had invented the microwave oven.

Rudolf Kompfner was born in 1909 in Austria, and originally trained as an architect but soon turned his interests to physics and electronics. He spent some time incarcerated in England early in WWII. You can't be too careful about Austrian architects! Soon he was released and drafted to help out in a secret tube research center at the University of Birmingham. In 1942 Kompfner invented the traveling wave tube, although his lab notebook shows he had the field lines sketched sketched incorrectly about the helix! He moved to the United States after the war and worked at Bell Labs with John Pierce on other exciting microwave stuff, earning more than 50 patents. Kompfner died in December 1977. Contributed by James, who works at NASA!

Hedwig Keisler Markey, a.k.a. glamorous Hollywood actress Hedy Lamarr, (not to be confused with Hedley Lamarr of Blazing Saddles fame), made a single but significant engineering contribution to today's microwave wireless networks. At her Austrian husband Fritz Mandl's armament company, she observed that radio-guided torpedoes were susceptible to jamming. Leaving der Vaterland in order to avoid personal participation in the Holocaust, she later obtained a secret U.S. patent on the idea of frequency hopping, shared with artist George Antheil. Their scheme used a mechanical device similar to the guts of a player piano to modulate the RF signal. Stonewalled by the good-old-boys of the Pentagon, Ms. Keisler's invention was not put to use by the military until the mid 1950s, after the patent expired. However, her work is regarded as the basis for all spread-spectrum techniques, including those used in today's wireless networks. Nominated by Pete F. from MA!

Want more microwave superstars? Check out the next room in the Microwave Hall of Fame!

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