It seems ironic that (German) Cauer's work leveraged (Russian) Pafnuty Chebyshev's polynomials (Chebyshev is also in the Microwave Hall of Fame).Īlthough he took a mandatory pledge to join the Nazi party, he was an outsider, with "Jewish blood" from an ancestor that limited his career. Cauer was on the list of high-value individuals targeted for a one-way trip to Moscow, but Russian troops invading Berlin didn't get the message and he was executed because that is what happens during war. Unfortunately, his documented follow-up work and who-knows-what future contributions were lost as WWII came to a close. This occurred through collaboration with Vanevar Bush, founder of a small company known as Raytheon, when Cauer studied (under a scholarship) for a brief time in the United States at MIT. While still in his 20s Cauer had experimented using an early analog computer to design RF filters (the computer mimicked polynomials using reactive components). The classic example you should be familiar with is filter design: maximally flat, equal-ripple, or flat group delay networks are designed starting with algebra instead of guess work, tuning and random optimization. This work represented a bold move from network analysis to network synthesis. In 1941, Wilhelm Cauer (1900 to 1945) published Theorie der linearen Wechselstromschaltungen (Theory of Linear AC Circuits). HP alumni (and alumnae) have put together an excellent web site with history of the company and other reminiscences, check it out! HP products and their descendents have been used by generations of microwave engineers and have always presented a problem during capital equipment requests, because this is equipment that never dies, so why would you ever need to replace it? HP eventually (1999) spun off the measurement business into a separate company called Agilent, which in turn spun off much of the original product line (including microwave test) into another new company called Keysight (2010). Another California entrepreneur, Walt Disney, was one of their first big contracts when his company ordered a few oscillators for use in creating the film "Fantasia". After fooling with inventions such as a bowling alley foul-line-roll indicator, their first successful product was an audio oscillator. In 1939 Bill Hewlett and Dave Packard started a business in Dave's garage using $538.
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