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His inventions included the helical antenna , the corner reflector antenna , and several other types of antennas. Kraus held a number of patents and published widely. Kraus was born in in Ann Arbor, Michigan.
He received his Ph. In addition to his professional achievements, he also contributed to amateur radio. He also helped construct and operate the University of Michigan ton cyclotron , then the world's most powerful particle accelerator. Following the completion of his doctorate, Kraus was a member of the research team in nuclear physics at the University of Michigan, helping to design and build the school's new ton cyclotron.
Kraus knew that a meteor entering the upper atmosphere leaves in its wake a small amount of ionized air. This air reflects a stray radio signal back to Earth, strengthening the signal at the surface for a few seconds. This effect is known as meteor scatter. Kraus predicted that what was left of Sputnik would exhibit the same effect, but on a larger scale. His prediction was correct; WWV's signal was noticeably strengthened for durations lasting over a minute.
In addition, the strengthening came from a direction and at a time of day that agreed with predictions of the paths of Sputnik's last orbits. Using this information, Kraus was able to draw up a complete timeline of Sputnik's disintegration. His data also led him to conclude that satellites do not fail as one unit.
Instead, his data indicated that the spacecraft broke up into its component parts as it moved closer to the Earth. From Wikipedia, the free encyclopedia.
John D. Ann Arbor, Michigan , U. Kraus - Engineering and Technology History Wiki". Retrieved Retrieved 25 July The New York Times. January 19, January 27, Retrieved June 5, Ohio State University. Retrieved June 7, Archived from the original PDF on July 27, Murray Joslin Henri G. Busignies Daniel E. Schwan Eugene I. Gordon John D. Kraus James L. Flanagan Robert A. Straiton John L. Moll George D. Forney James H. Pomerene Leslie A. Geddes Robert W. Lucky Floyd Dunn Esther M.
John D Kraus Books
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ISBN 13: 9789352606184
Kraus, J. The propagation and measurement in absolute units of ultra-high-frequency radio waves. PhD thesis, University of Michigan, Books Kraus, J. Elements of Electromagnetics. New York, McGraw-Hill,
Antennas And Wave Propagation, 5Th Edition
Antennas (By Ph. D John D. Kraus).pdf